The molality of 6.2g of LiBr in 52.6g water is 0.0013mol/kg
The molecular weight of LiBr is 86.845 g/mol thus substituting this value in the formula of moles,
Moles of LiBr = grams/molecular weight
Moles of LiBr = 6.20/ 86.845
Moles of LiBr = 0.071 mol
Substituting the value of moles in the formula of molality
Molality= moles/grams of solvent
Molality= 0.071/52.6
Molality= 0.0013 mol/g
Molality, or more specifically, the number of moles of solute contained in a kilogram of solvent, is a unit used to express the concentration of a solution.
The quantity of moles of solute per kilogram of solvent is known as molality, which is denoted by a tiny "m."
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The bond enthalpy of F2(g) is 156.9 kJ/mol. Calculate ΔH o f for F(g).
The bond enthalpy of F2(g) is 156.9 kJ/mole. The ΔH o f for F(g) is 78.5 kJ/ mole.
What is bond enthalpy?Bond enthalpy is defined as the amount of energy needed to dissolve one mole of a certain type of bond between two gaseous atoms. In general, the amount of energy acquired or lost during a reaction is comparable to the process's change in enthalpy.
Given the bond enthalpy of F2 = 156.9 kJ/ mole
The ΔH can be calculated as
ΔH = bond enthalpy of F2 / 2
ΔH = 156.9 kJ/mole / 2
ΔH = 78.5 kJ/mole
Thus, the bond enthalpy of F2(g) is 156.9 kJ/mole. The ΔH o f for F(g) is 78.5 kJ/ mole.
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What is the Internal Energy of a Human Body? Define internal energy as Delta E.
SHOW ALL WORK!
20 points
The internal energy of a human body is the net energy contained in the body due motion of its particle or molecules.
In a human body the internal energy is stored . It increases when the temperature of the body rises, or when the body observes some changes. Internal energy we can say that is the sum of kinetic and potential energy of all particles in the body.
Internal energy is a state function of a system and is an extensive quantity. Every substance possesses a fixed quantity of energy which depends upon its chemical nature and also on its state of existence. Every substance have a definite value of Internal energy.
The change in the Internal energy of a reaction may be considered as the difference between the internal energies of the two states.
ΔU = [tex]E_{B}[/tex] - [tex]E_{A}[/tex] where [tex]E_{B}[/tex] and [tex]E_{A}[/tex] are the initial energies of states A and B. Or we can also write the equation as:
ΔU = ΔE
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Please help I have been stuck for a week Which of the following reactions is BALANCED and shows INCOMPLETE combustion
A. 2C5H12 + 1102--> 12CO+ 10H2O
B. 2C5H12 + 1102--> 10CO +12H20
C. C5H12 + 802--> 5CO2+6H20
D. C5H12 + 802--> 6CO2 5H20
The reaction that is balanced and shows incomplete combustion is:
2 C₅H₁₂ + 11 O₂--> 10 CO + 12 H₂0; option B.
What is a combustion reaction?A combustion reaction is a reaction in which a substance reacts with oxygen to release large amounts of heat and light energy.
In the combustion of carbon-containing compounds, carbon dioxide and water are usually produced.
In incomplete combustion of carbon compounds, carbon monoxide or carbon (ii) oxide is produced.
For a balanced reaction, the moles of atoms of elements on the reactant side are equal to the moles of atoms on the product side.
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20. (01.08 MC)
Alchemy is a branch of ancient knowledge that states that all matter is composed of air, fire, earth, ar
Which of these best explains whether alchemy is a science or pseudoscience? (4 points)
It is a science because all matter is known to be made of elements.
it is a science because air, fire, earth, and water all are forms of matter.
It is pseudoscience because all matter is known to be made of atoms.
It is pseudoscience because ancient knowledge is mystical yet reliable.
It is pseudoscience because each metal is known to be a unique element alchemy is a science or pseudoscience.
What is a matter in chemistry?Matter is anything that occupies space and has mass; in other respects, matter is the "thing" that the cosmos is made of. The fundamental constituents of all stuff are called elements. These are not changed into other elements by conventional chemical processes and have distinct chemical and physical properties.
What does matter consist of?Matter can be solid, liquid, or gaseous on Earth. Solid particles, fluids, and gases are supported by the exceptionally small building components known as atoms and molecules. A solid's component particles are attracted to one another strongly. They are close to one another and vibrate en position without passing each other.
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The complete question is -
Alchemy is a branch of ancient knowledge that states that all matter is composed of air, fire, earth. Which of these best explains whether alchemy is a science or pseudoscience?
A-It is a science because all matter is known to be made of elements.
B-It is a science because air, fire, earth, and water all are forms of matter.
C-It is pseudoscience because all matter is known to be made of atoms.
D-It is pseudoscience because ancient knowledge is mystical yet reliable.
E-It is pseudoscience because each metal is known to be a unique element.
20 POINTS PLEASE HELP
NADP, nicotinamide adenine dinucleotide phosphate forms NADPH by combining with the H+ ion and two electrons. Thus, option C is correct.
What is NADP ?NADP, nicotinamide adenine dinucleotide phosphate is a reducing agent in electron transport chains of metabolic processes in living things. NADPH is the reduced form of NADP.
In biochemical reactions such as glycolysis, photosynthesis etc, NADP plays a significant role as a reducing agent. NADP and NADPH together are called the redox couple and they maintain cellular redox homeostasis.
Hydrogenation of molecules is called reduction and thus the NADP+ reduces to its NADPH by combining with a two electrons and H+. Hence option C is correct.
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What is the name of the compound with the chemical formula PbBr4
The compound with the chemical formula PbBr₄ is called lead(IV) bromide.
Lead(IV) bromide is an inorganic compound composed of the elements lead (Pb) and bromine (Br). The compound is named based on the oxidation state of lead, which is +4 in this case.
In naming compounds, the Roman numeral in parentheses after the element name indicates the oxidation state of the metal. In the case of lead(IV) bromide, the Roman numeral IV indicates that lead is in the +4 oxidation state. This means that lead has lost four electrons to achieve a stable configuration.
The name "lead(IV) bromide" accurately represents the composition and oxidation state of the compound. It is worth noting that lead(IV) bromide is a relatively unstable compound and is not commonly encountered in practical applications.
Hence, the name of the compound is lead(IV) bromide.
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a carbon is found to form two oxide, which contain 42.9% and 27.3%carbon respectively, show that these figure illustrate the law multiple proportion
The figures illustrate the law of multiple proportions because the empirical formulas of the two oxides are CO and [tex]CO_2[/tex] respectively.
Law of multiple proportionsThe law of multiple proportions states that when two elements combine with each other to form more than one chemical compound, the weights of one element that combine with a fixed weight of the other are usually in small whole-number ratios.
The figures mentioned in the problems can be tested for agreement with the law of multiple proportions by finding the empirical formulas of the two oxides formed against a fixed weight of carbon:
The analysis of the first oxide is as follows:
C = 42.9
O = 100-42.9
= 57.1
The equivalent mole of each atom will then be calculated by dividing each atom by their respective molar weights:
C = 12 g/mol
O = 16 g/mol
C = 42.9/12
= 3.56
O = 57.1/16
= 3.56
Thus, the empirical formula of the first oxide is CO.
The second oxide:
C = 27.3
O = 100 - 27.3
= 72.7
The equivalent mole of each atom will be:
C = 27.3/12
= 2.27
O = 72.7/16
= 4.54
Dividing the moles by the smallest mole
C = 2.27/2.27
= 1
O = 4.54/2.27
= 2
Thus, the empirical formula of the second oxide is [tex]CO_2[/tex].
The first oxide gives CO while the second oxide gives [tex]CO_2[/tex]. The weight of oxygen that combines with the fixed weight of carbon can be seen to be in simple whole-number ratios (1 and 2).
In other words, the figures quoted obeys the law of multiple proportions.
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If a sulfuric acid (H₂SO₄, MM = 98.09 g/mol) solution is completely neutralized with 61.37 mL of the NaOH solution above what was the mass in grams of sulfuric acid in the solution. Remember, you need a balanced chemical reaction for stoichiometry. (do not forget about SF)
Assuming the concentration of the NaOH solution that reacted with the sulfuric acid is 1.0 M, the mass of the sulfuric acid that reacted is 3.01 g.
What is a neutralization reaction?A neutralization reaction is a reaction in which an acid reacts with a base to form salt and water only.
In the given reaction, a given amount of sulfuric acid was neutralized by 61.37 m:L of a NaOH solution.
The equation of the neutralization reaction is given below:
2 NaOH (aq) + H₂SO₄ (aq) ----> Na₂SO₄ (aq) + 2 H₂O (l)
The mole ratio of the reaction shows that 2 moles of NaOH solution will react with 1 mole of H₂SO₄ solution.
The moles of NaOH reacting = concentration * volume in liters
The concentration of the NaOH solution is not given. Assuming the concentration of the NaOH solution is 1.0 M
Moles of NaOH reacted = 1.0 * 61.37 mL * 1 L / 1000 mL
Moles of NaOH reacted = 0.06137 moles
Moles of H₂SO₄ reacted = 0.0614 / 2
Moles of H₂SO₄ reacted = 0.0307 moles
Mass of H₂SO₄ reacted = 0.0307 * 98.09
Mass of H₂SO₄ reacted = 3.01 g
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For the reaction N2(g) + 3H2(g) ↔ 2NH3(g), the equilibrium constant, K, = 9.83 x 10-2 at a certain temperature and pressure.
While the reaction was proceeding at this temperature and pressure the concentrations of the reactants and products were measured and found to be
[N2] = 0.910 mol/L
[H2] = 0.300 mol/L
[NH3] = 0.0081 mol/L
a. Was the reaction at equilibrium? Explain. (4 marks)
b. If the reaction was not at equilibrium, in which direction was it proceeding? Explain
The reaction is not at equilibrium and it is in the forward direction.
a.
Given,
[N₂] = 0.910 mol / L
[H₂] = 0.3 mol / L
[NH₃] = 0.0081 mol / L
K = 9.83 x 10⁻²
The balanced chemical equation for the given reaction is,
N₂(g) + 3H₂(g) ⇄ 2NH₃(g)
The formula of equilibrium constant is given by,
K = [NH₃]² / [N₂] [H₂]²
9.83 x 10⁻² = [(0.0081)² ]/ [0.910 × (0.3)²]
⇒9.83 x 10⁻² = (0.00006561) / (0.0819)
⇒9.83 x 10⁻² = 0.0008010989
⇒0.00983 = 0.0008010989
LHS ≠ RHS
Hence, the reaction is not at equilibrium.
b.
The reaction is in forward direction.
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Indicate how the concentration of each species in the chemical equation will change to reestablish equilibrium after changing the concentration of the reactant or product. An up arrow indicates an increase in concentration, a down arrow indicates a decrease in concentration, and leaving it blank means there is no change in the concentration. after the concentration of Br₂ is decreased after the concentration of HBr is increased H₂(g) + Br₂(g) O 0 □ ↓ Answer Bank ↑ 2HBr(g) 0 □
The concentration of species in the reaction changes the reaction in the following ways: decrease carbon dioxide = forward direction of reaction.
The direction of the reaction can be assessed by the following. On increasing the concentration of the reactant the reaction processes in the forward direction. On increasing the concentration of product the reaction processes in the backward direction.
The given equilibrium is:
2CO(g) + O2(g) ↔ 2CO2(g)
increase CO = forward direction of reaction
increase oxygen = forward direction of reaction
decrease CO = no change in equilibrium as reaction not processes.
decrease oxygen = no change in equilibrium as reaction not processes.
increase carbon dioxide= reverse direction
decrease carbon dioxide = forward direction of reaction.
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How much heat is required to melt 39.4 g of ice at (0 ∘C )? The heat of fusion for water is 6.02 kJ/mol .
Specific heat capacity of a substance is the amount of heat required to raise the temperature by one degree Celsius of one gram of a substance. Therefore, 13.12KJ of heat is required to melt 39.4 g of ice at (0 ∘C ).
What is Enthalpy?Enthalpy term is basically used in thermodynamics to show the overall energy that a matter have. Mathematically, Enthalpy is directly proportional to specific heat capacity of a substances.
Mathematically,
q = n ×ΔH
where
q = amount of heat= ?
n = no of moles
ΔH = enthalpy ( 6.02 kJ/ mol)
n = w / M.M
w = given mass =39.4g
M.M = molar mass ( molar mass of water)=18g/mol
n =39.4/ 18
=2.18
Substituting all the given values, we get
q = n ×ΔH
= 2.18 ×6.02
= 12.401 kJ
=13.12KJ
Therefore, 13.12KJ of heat is required to melt 39.4 g of ice at (0 ∘C ).
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The diagram shows the characteristics of two different components of scientific knowledge.
Component C
Component D
Risa
suggested
explanation
of a single
phenomenon
or few related
phenomena
It is testable.
It provides
a unifying
explanation for
a vast set of
phenomena
natural world
Which statement explains which component is likely to be more powerful in explaining a scientific phenomenon? (4 points)
Component C, because a theory is often based on possibility and not certainty.
Component D, because a hypothesis is often based on possibility and not certainty.
Component C, because the ability to explain several occurences in the natural world is a characteristic of a hypothesis
Component D, because the ability to explain several occurences in the natural world is a characteristic of a theory
The statement that explains which component is likely to be more powerful in explaining a scientific phenomenon is:
Component D, because the ability to explain several occurrences in the natural world is a characteristic of a theory; option DWhat constitutes scientific knowledge?Scientific knowledge refers to the body of knowledge that is obtained by the scientific method.
The scientific method refers to a series of steps that scientists follow in their discovery and explanation of natural phenomena.
The scientific method is as follows:
observationasking questionsgiving a hypothesisconducting experimentsanalyzing the results of the experimentsrepeated experiments drawing conclusions and propounding a theory based on the results of the experiments.Hence, scientific knowledge must explain universal occurrences ad must be testable.
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Evaluate the following summaries and choose the one that best describes metals, nonmetals, and metalloids.
A)
Metals are liquids, good conductors, and melt at low temperatures. Nonmetals are solid, poor conductors, and low in density. Metalloids are very heavy, shiny, good conductors, and have very high densities.
B)
Metals are generally very shiny, good conductors, high in density, and melt at high temperatures. Nonmetals are generally dull, poor conductors, low in density, and melt at low temperatures. Metalloids exhibit properties of both metals and nonmetals, make fair conductors, and can appear as shiny or dull.
C)
Metals are usually very shiny, high in density, and poor conductors. Nonmetals are great conductors, dull, and very dense. Metalloids are the heaviest of all elements, solid, and melt at low temperatures.
D)
Metals are usually dull, low in density, and melt at low temperatures. Nonmetals are usually very shiny, high in density, and good conductors of electricity. Metalloids are generally very shiny, solid, and melt at very high temperatures.
The correct summary of the properties is; Metals are generally very shiny, good conductors, high in density, and melt at high temperatures. Nonmetals are generally dull, poor conductors, low in density, and melt at low temperatures. Metalloids exhibit properties of both metals and nonmetals, make fair conductors, and can appear as shiny or dull.
What are the classifications of materials?Materials are of course composed of matter and mater is composed of atoms of elements. There are three main classes of the elements that we have in the periodic table. The classes of the elements are known as;
1) Metals
2) Non metals
3) Metalloids
Metals do conduct electricity while the non metals just do not conduct electricity. The metalloids would acts as conductors of electricity under certain circumstances.
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A balloon at 30.0°C has a volume of 222 mL. If the temperature is increased to 64.1°C and the pressure remains constant, what will the new volume be, in mL?
Answer:
Explanation:
I forgot
The reaction of 50 mL of gas with 150 mL of gas to form ammonia via the equation:
N (g) + 3H (g) -----> 2NH (g)
will produce __________ mL of ammonia if pressure and temperature are kept
At constant temperature and pressure, 100mL of ammonia will be produced.
What is ammonia?Ammonia is described as an inorganic compound of nitrogen and hydrogen with the formula NH₃. It is a stable binary hydride, and the simplest pnictogen hydride, ammonia is a colorless gas with a distinct pungent smell.
Gay-Lussac's law of combining volumes states that the volume of gases which take part in a chemical reaction bear a simple whole number ratio to one another and to the volume of products if gaseous, when measured at constant temperature and pressure.
According to the Equation of reaction: N₂(g) + 3H₂(g) ----> 2NH₃(g)
From the equation of reaction given above,
1 mole of nitrogen gas reacts with 3 moles of hydrogen to produce 2 moles of ammonia. Therefore,
50 mL of nitrogen will react to produce produce 2 * 50 mL of ammonia = 100ml of ammonia
Also, 150mL of hydrogen will react to produce 2 *150mL/3 of ammonia = 100ml of ammonia.
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An object is placed in 20 mL of water. This water rose to a level of 26 mL. The object has a mass of 18 g. What is the density of the object.
An object is placed in 20 mL of water. This water rose to a level of 26 mL. The object has a mass of 18 g. the density of the object is 3 g/mL.
given the data as follows :
mass of object = 18 g
volume of object = final volume - initial volume
volume of object = 26 mL - 20 mL
= 6 mL
the density expression is given as:
Density = mass / volume
Density = 18 g / 6 mL
Density = 3 g/mL
Thus, An object is placed in 20 mL of water. This water rose to a level of 26 mL. The object has a mass of 18 g. the density of the object is 3 g/mL
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A 2.3kg object accelerated from a rest to a speed of 38.6 m/s in 37 seconds what is the answer in N
The force acting on a moving body can be determined using its acceleration and mass. The mass of the object is 2.3 Kg the force when it is accelerated to 38.6 m/s in 37 seconds is 2.4 N.
What is force?Force is an external agent acts on a body to change it from the state of motion or rest. Various kinds of forces include gravitational force, frictional force, nuclear force etc.
In physics, force is the product of mass and acceleration. Acceleration of an object is the rate of change in its velocity. Here, the change in speed from rest is 38.6 m/s and the time taken is 37 seconds hence the acceleration is:
a = 38.6 m/s / 37 s
= 1.04 m/s².
Now, the force can be calculated from by taking the product of mass and acceleration as follows:
F = ma
= 2.3 Kg × 1.04 m/s²
= 2.4 N.
Hence, the force acting on the object to change it from rest is 2.4 N.
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What is the strength of the final solution of a 20% solution is diluted twice 1:5, then 1:2?
The final solution has a strength of 2%.
Let the initial volume of solution = x unit^3
The solution is initially by 20%
Amount of solute = x*20/100
= x/5 unit^3
Now,
We first diluted by 1:5
1 part of initial solution is diluted with 4 parts of diluent
For 'x' unit^3 solution,
Diluent added = 4x unit^3
Total volume of solution becomes = x+4x
= 5x unit^3
Now,
We diluted by 1:2
1 part of solution is diluted with 1 part of diluent
5x unit^3 of solution is diluted with 5x unit^3 of diluent
Final solution = 5x + 5x = 10x unit^3
Final strength = (Amount of Solute/Final solution)*100%
= (x/5/10x)*100%
= x/50x*100%
= 2%
The final strength of final solution is 2%
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Aqueous copper (II) nitrate, Cu(NO3)2 reacts with aqueous potassium carbonate, K2CO3 forming solid copper (II) carbonate, Cu(CO3).
Answer:
Cu(NO3)2 (aq) + K2CO3 (aq) => CuCO3 (s) + 2KNO3 (aq)
Explanation:
I interpret your question is how to balance the above reaction, right?
Cu(NO3)2 (aq) + K2CO3 (aq) => CuCO3 (s) + 2KNO3 (aq)
Cu: 2
NO3: 2
K: 2
CO3: 2
A sample of grape juice has a hydroxide ion concentration of 1.4 × 10-10 M. Is the grape juice more or less acidic than a sample of orange juice that has a hydronium ion concentration of 1.8 × 10-4 M? To compare the acidity of the orange juice and grape juice, compare the hydronium ion concentrations and/or pH values of the two solutions. How does the acidity of a solution vary with hydronium ion concentration and pH?
For the grape juice, we get that the hydroxyl ion concentration is 1.4 ×10-10M.
Hence, pOH will be = -log[1.4*10⁻¹⁰] which is approximately 9.6.
Now the value of pH will be = 14-pOH = 14 - 9.6 = 4.4.
For the orange juice, we know that the H+ or hydronium ion concentration is 1.8 × 10-4 M.
Then, the value of the pH will be= -log[1.8*10⁻⁴]=3.7.
Thus from the above result, it is clear that the range juice has lower pH, hence it will be more acidic. While the grape juice will be less acidic.
The pH can either go up or down depending on the change in hydronium concentration. If the hydronium concentration increases, the pH decreases, causing the solution to become more acidic. This happens when an acid is introduced. As H+ ions dissociate from the acid and bond with water, they form hydronium ions, thus increasing the hydronium concentration of the solution. If the hydronium concentration decreases, the pH increases, resulting in a solution that is less acidic and more basic. This is caused by the OH^- ions that dissociate from bases
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0.499 g of NaOH (MM = 40.00 g/mol) is dissolved in 150.00 mL of water, what is the theoretical molarity of NaOH?
Answer:
0.0833 M NaOH
Explanation:
To calculate the molarity, you need to
(1) convert grams NaOH to moles (using the molar mass)
(2) convert mL to liters
(3) calculate the molarity
It is important to arrange the ratios/conversions in a way that allows for the cancellation of units. The final answer should have 3 sig figs like the given value with the smallest amount of sig figs (0.499 = 3 sig figs).
0.499 g NaOH 1 mole
-------------------------- x ------------------ = 0.0125 moles NaOH
40.00 g
150.00 mL H₂O 1 L
--------------------------- x ------------------ = 0.15000 L H₂O
1,000 mL
Molarity = moles / volume
Molarity = 0.0125 moles NaOH / 0.15000 L H₂O
Molarity = 0.0833 M
11.How much water must be added to 15 mL of sodium chloride solution 23.4% to dilute the concentration to 0.06 mmol/mL? (MW NaCl = 58.44)
The volume of water that must be added to 15 mL of sodium chloride solution 23.4% to dilute the concentration to 0.06 mmol/mL is 999985 mL.
What is the concentration of 23.4% sodium chloride solution in mol/L?The concentration of 23.4% sodium chloride solution in mol/L is calculated as follows:
23.4% solution = 23.4 g/100 mL solution
23.4 g/100 mL = 234 g/L
Molarity = mass concentration / molar massmolar mass of NaCl = 58.5
Molarity of the NaCl solution = 234 / 58.5
Molarity = 4 mol/L
Using the dilution formula:
C₁V₁ = C₂V₂
where;
C₁ is the initial concentration = 4 mol/L or 4000 mmol/L
V₁ is the initial volume = 15 mL
C₂ is the final concentration = 0.06 mmol/L
V₂ is final volume = ?
V₂ = 4000 * 15 / 0.06
V₂ = 1000000 mL
Hence, the volume of water to be added will be:
1000000 - 15 = 999985 mL
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how without making any quantitative measurements could you determine if a piece of plastic has a density greater or less than 1 g/cm
To determine if the piece of plastic has a density greater or less than 1 g/cm³, the piece of plastic is placed in water, if it sinks, it has a greater density, but if it floats, it has a lesser density.
What is an appropriate method to determine if a piece of plastic has a density greater or less than 1 g/cm³?The density of a substance measure how compact the substance is.
For fluids such as water, objects that are denser than water will sink in water. However, if the density is less than that of water, it will float in water.
The density of water is 1 g/cm³.
Hence, objects that have densities greater than 1 g/cm³ will sink in water, whereas objects that have densities less than 1 g/cm³ will float in water.
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Have two sides that mirror each other along one plane through the central axis.
Have two sides that mirror each other along one plane through the central axis called as symmetrical
The line of centroids or central axis is defined as the line that passes through the centroids along the beam and the cross section are then defined as the beam section which are perpendicular to the central axis and that two side are mirror images of each other and place a mirror on the fold then image of one side of the picture will fall exactly on the other side of the picture and that are called as symmetrical means same
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Outline process of preparing 0.1 M silver nitrate solution given deionized water,clean and dry volumetric flask(100ml) and silver nitrate crystals
1.6987 grams the silver nitrate crystals is weighed, 100 mL of water is measured, and the weighed silver nitrate is dissolved in the measured amount of water.
Solution preparationWe are to prepare a 0.1 M silver nitrate solution given the following:
Crystals of silver nitrateClean and dry volumetric flaskDeionized waterWeighing balanceFirst, we need to make some calculations to make the amount of silver nitrate and water that will be used.
0.1 M means 0.1 mol silver nitrate crystal in 1 L of water. However, we only have a 100 mL volumetric flask. We need to know the mol amount that will be equivalent to 100 mL of water.
0.1 mol = 1000 mL
100 mL = 100 x 0.1/1000
= 0.01 mol
Mole = mass/molar mass
Molar mass of silver nitrate = 169.87 g/mol
0.01 mol silver nitrate = 0.01 x 169.87
= 1.6987 grams
Thus, 1.6987 grams of silver nitrate would be weighed.
The following steps would be taken to prepare the solution:
Weigh out 1.6987 grams of the silver nitrate crystals.Measure out 100 mL of the deionized water using the volumetric flask.Dissolve the weighed silver nitrate into the measured waterWhat you will have is 100 mL of 0.1 M silver nitrate solution.
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What is the density of an object that has a mass of 6.2 g and a volume of 4.4 mL ?
Density=mass/volume
d=6.2/4.4
d=1.40 grams/cm³
Calculate the mass of 45.0 L of Cl₂ at
87.0° C and 950. mm Hg.
Use the Ideal Gas Law formula and here are values for R:
8.134 (L* kPa)/(mol *K)
0.0821 (atm* L)/(mol * K)
62.364 (L * mmHg)/(mol *K)
The mass of 45.0 L of Cl₂ at 87.0° C and 950 mm Hg is 134.7214 g.
Volume = 45.0 L
Temperature = = (87.0 + 273) K = 360 K
Pressure = 950 mm Hg (1 mm Hg = 0.00131579 atm) = 1.25 atm
The formula used to calculate moles is as follows.
∴PV = nRT
where,
P = pressure
V = volume
n = no. of moles
R = gas constant = 0.0821 L atm/mol K
T = temperature
Substitute the values into the above formula as follows:
∴ PV = nRT
=> 1.25 atm × 45.0 L = n × 0.0821 L atm/mol K × 360K
=> n = 1.25 atm × 45.0 L / n × 0.0821 L atm/mol K × 360K
=> n = 56.25 / 29.556 mol
=> n = 1.90 mol
Moles is the mass of a substance divided by its molar mass. So, the mass of Cl₂ (molar mass = 70.906 g/mol) is calculated as follows:
∴ Moles = mass / molar mass
=> 1.90 mol = mass / 70.906 g/mol
=> mass = 134.7214 g
Thus, we can conclude that the mass of 45.0 L of Cl₂ at 87.0° C and 950 mm Hg is 134.7214 g.
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Answer:
Don't follow this!
Explanation:
Your chemistry teacher knows that you are cheating and using this as your own work.
-From said teacher!
I have an unknown volume of gas held at a temperature of 126 K in a container with a pressure of 31 atm. If by increasing the temperature to 209 K and decreasing the pressure to 19 atm causes the volume of the gas to be 9.4 liters, how many liters of gas did I start with?
The volume that was started with if the temperature of 126 K in a container with a pressure of 31 atm is 3.47L.
How to calculate volume?The volume of a gas can be calculated using the combined gas law equation as follows:
P₁V₁/T₁ = P₂V₂/T₂
Where;
P₁ = initial pressureV₁ = final pressureT₁ = initial temperatureP₂ = final pressureV₂ = final volumeT₂ = final temperatureAccording to this question, an unknown volume of gas held at a temperature of 126K in a container with a pressure of 31 atm.
If by increasing the temperature to 209 K and decreasing the pressure to 19 atm causes the volume of the gas to be 9.4 liters, the initial volume is calculated as follows:
31 × V₁/126 = 19 × 9.4/209
0.246V = 178.6/209
0.246V = 0.854
V = 3.47L
Therefore, 3.47L is the volume of the gas that started.
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How many electronic under layers are there on level n=7?
The seventh shell contains 49 orbitals, making the total number of electrons in 49 orbitals 98.
How do Group 7 elements appear?characteristics of elements in group 7
At room temperature, each halogen exhibits the properties listed below: A light yellow gas is fluorine. A deadly green gas, chlorine is poisonous. The reddish-brown liquid bromine is poisonous.
Since the group number is 7, this means that the outer shell of halogen atoms contains seven electrons (energy level). These atoms gain a single electron in order to stabilize themselves and adopt the same structure as the nearby noble gas (rather than losing seven electrons which would take much more energy).
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What mass of carbon dioxide is produced from the complete combustion of 6.70x10-3 g of
methane?
The full burning of 6.70x10-3 g of methane results in the production of 2.95872 mass of carbon dioxide.
Combustion is what kind of reaction?Burning is sometimes referred to as combustion. A fuel is heated and interacts with oxygen in a combustion reaction. The three elements of fuel, heat, and oxygen required for combustion are summarized by the fire triangle.
What is the purpose of combustion?Chemical processes that occur during combustion are frequently quite exothermic. The energy of chemical molecules generated during this reactive process is used by combustion systems to power vehicles, produce electricity, or heat a variety of uses.
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