When metals and non metals combine in fixed proportion then a chemical compound is formed So, the compound that will be formed from group 13 elements and group 17 is AlCl₃.
What is chemical formula?
Chemical formula is a formula where cation and anion combine to form a molecule in fixed proportion. Metals combine in form of cation and non metals combine in form of anion.
Cation is the species that give electron and attain positive charge while anion is a species which gain electron and attains negative charge so when anion and cation combine in fixed ration the the overall charge of the molecule is zero that is molecule is neutral, the charge over cation and anion is also called oxidation state. the compound that will be formed from group 13 elements and group 17 is AlCl₃.
Therefore, the correct option is option A.
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How many grams of sodium iodide, Nal, must be used to produce 90.2 g of iodine, 1₂?
mass:
g Nal
300 grams of sodium iodide, Nal, must be used to produce 90.2 g of iodine, I₂
Sodium iodide is the ionic compound formed from the chemical reaction of sodium metal and iodine
Here given data is
I₂ has the molar mass = 253.8g/mol
So how many moles of I₂ we want to produce = 90.2 g I₂ ×1mol I₂ /253.8g/mol = 0.35 mole of I₂
Then the conversion of NaI to I₂ are
2 NaI → 2Na + I₂
0.35 mole of I₂ × 2 mole of NaI/mole of I₂ = 2 mole of NaI are needed
covert this value into gram
2 mole of NaI ×150. g NaI / mole NaI = 300 gram NaI would be needed
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0.50 g of Mg reacts with excess oxygen in a
bomb calorimeter with a heat capacity of
3290 J/°C. The initial temperature is 21.5 °C
and the final temperature is 25.2 °C.
What is the enthalpy of the reaction?
The enthalpy of the reaction 12173 J/°C
Heat capacity or thermal capability is a bodily belonging of count number, described as the quantity of warmth to be supplied to an object to provide a unit trade in its temperature. The SI unit of heat capacity is joule in line with kelvin. heat capacity is an intensive property.
Heat capability is described as the quantity of warmth strength required to raise the temperature of a given quantity of matter through one diploma Celsius. warmth ability for a given count depends on its length or amount and as a result, it's far an extensive asset. The unit of heat capacity is joule in line with Kelvin or joule according to degree Celsius.
Calculation:-
heat = msΔT
= 0.50 × 3290 × (25.2 - 21.5)
= 0.50 × 3290 × 3.7
= 6086.5 J
q = mΔHf
ΔHf = q/m
= 12173 J/°C
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HELP !!!!!!! pls. with chemistry
Answer:
Qns no.3: it is not a correct answer
Explanation:
S has 6 outermost electrons and O has 6 outermost electrons, during bonding inorder to be stable their shouldn't be any unpaired electron in a structure. so 2 double bonds will be formed.
A propane tank when first filled reads 175. psi. After 1 month of use, the propane tank reads 81. psi.
Note: Reference the Conversion factors for non-SI units table for additional information.
Part 1 of 2
Convert the tank pressure when first filled to mmHg. Be sure your answer has the correct number of significant figures.
m
175. ps1=
mmHg
Answer:
After 1 month of use, the propane tank reads 81
Explanation:
Use the drop-down menus to identify the parts of DNA.
Label A
Label B:
The DNA parts are identified as:
Label A is Nitrogen basesLabel B is Sugar phosphate backboneWhat are genetic codes?Genetic codes are nucleotide sequences in deoxyribonucleic acids (DNA) and ribonucleic acids (RNA) that determines the order of an amino acid which is the building block of proteins. It is a set of rules for translating information encoded genetic materials by living cells.
The part labelled A are called Nitrogen bases containing adenine and thymine, T pair, cytosine, C and guanine, G pair that are bound to form DNA while the Sugar phosphate backbone forms the structural base of the DNA and RNA.
The complete question is:
Use the drop-down menus to identify the parts of DNA.
Label A
Label B
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Answer: Label A is nitrogen bases
Label B is sugar phosphate backbone
A 2.00 M HCl solution is diluted by transferring 25.0 mL of the solution to a 100.0 mL volumetric flask and adding water to the line on the neck of the flask. What is the concentration of the solution in the flask?
A) 0.250M
B) 0.500M
C) 1.00M
D) 8.00M
convert 0.87 atm to inches Hg. please explain step by step
Answer:
26.03 inHg
Explanation:
1 atm = 29.92 inHg
0.87 atm = 29.92 inHg x 0.87
0.87 atm = 26.03 inHg
calculate molality 6.20g LiBr in 52.6g water
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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I need help with #2 please
Answer:
Third choice
Explanation
Because reactivity of the elements decrease across the periodic table and it depends on the number of protons it has. Hence low number of protons more reactive.
How many liters of water are produced from the combustion of 2.5 moles of methane gas?
Answer:
this is your answer 1234
what would be the indepenndant variable, control group, and dependant variable in the how much salt is needed to float expirament
In the egg floating experiment, the independent variable is adding salt to the water, the dependent variable is the egg floating in the water and the control group is the beaker just with water.
The egg floating experiment is done to test the density of the egg with respect to the water. Generally, the egg sinks in the water as the egg has a higher density than water.
On the other hand, if salt is added to water to form a salt solution and if the egg is added to that solution, then the egg floats. This is because the density of the egg is lesser than the salt solution leading the egg to float.
Therefore, in this experiment, the independent variable is the amount of salt added to the water and the dependent variable is the egg floating in the water as it is dependent on the amount of salt added the water. Thus, the control group is the beaker with water.
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4. A solid is 5 cm tall, 3 cm wide and 2 cm thick. It has a mass of 129 g. What is its density?
The diagram shows an exchange
surface in the human body. Name the
parts labelled 2.
Enter your answer
Answer: villi/villus
Explanation: The parts labeled 2 are villi, many of which are found in the small intestine.
villi/villus exchange surface in the human body which are found in the small intestine.
what are the function of villi ?They are small finger-like folding in the small intestine, A network of capillaries and a big lymph vessel called the lacteal supply the villi.
These are found in the small intestine's inner walls, Villi are specialized for absorption in the small intestine as they have a thin wall, one cell thick, which enables a shorter diffusion path.
They have a large surface area so there will be more efficient absorption of fatty acids and glycerol into the blood stream. They have a rich blood supply to keep a concentration gradient.
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Although the heat source is at the bottom of the beaker, all of the water is the same temperature.
What keeps the water at the top of the beaker the same temperature as that of the bottom?
Responses
Heat from the burner radiates through the liquid and causes even heating.
Heat from the burner radiates through the liquid and causes even heating.
Evaporation heats the water at the top and the flame heats the water at the bottom.
Evaporation heats the water at the top and the flame heats the water at the bottom.
The walls of the beaker reflect heat towa
Heat from the burner radiates through the liquid and causes even heating. Due to this reason, the water at the top of the beaker the same temperature as that of the bottom. The correct option is option A.
What is temperature?Temperature is used to measure degree or intensity of heat of a particular substance. Temperature is measured by an instrument called thermometer.
Temperature can be measured in degree Celsius °c, Kelvin k or in Fahrenheit. Temperature is a physical quantity. Heat always flow from higher temperature source to lower temperature source. Heat from the burner radiates through the liquid and causes even heating. Due to this reason, the water at the top of the beaker the same temperature as that of the bottom.
Therefore, the correct option is option A.
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I need help on question number 3 please
Answer:
.......element 3 ............
A 90.0 g piece of metal, initially at 98.6°C, is placed into 120.0 g of water initially at 24.3°C. If the final temperature of the water is 34.0°C, what is the specific heat of the metal? (The specific heat of water is 4.184 J/g･°C).
Taking into account the definition of calorimetry, if the final temperature is 34 °C, the specific heat of the metal is 0.8381 J/gC.
CalorimetryCalorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
When heat added or removed from a substance causes a temperature change in it without affecting its molecular structure, it is called sensible heat.
The expression that allows to calculate heat exchanges is:
Q = c× m× ΔT
where:
Q is the heat exchanged by a body of mass m.c is the specific heat substance.ΔT is the temperature variation.Specific heat of the metalIn this case, you know:
For metal:Mass of metal= 90 gInitial temperature of metal= 98.6 °CFinal temperature of metal= 34 ºCSpecific heat of metal= UnknownFor water:Mass of water = 120 gInitial temperature of water= 24.3 °CFinal temperature of water= 34 °CSpecific heat of water = 4.186 J/gCReplacing in the expression to calculate heat exchanges:
For metal: Qmetal= Specific heat of metal × 90 g× (34 C -98.6 C)For water: Qwater= 4.186 J/gC× 120 g× (34 C - 24.3 C)If two isolated bodies or systems exchange energy in the form of heat, the quantity received by one of them is equal to the quantity transferred by the other body. That is, the total energy exchanged remains constant, it is conserved.
Then, the heat that the gold gives up will be equal to the heat that the water receives. Therefore:
- Qmetal = + Qwater
- Specific heat of metal × 90 g× (34 C -98.6 C)= 4.186 J/gC× 120 g× (34 C - 24.3 C)
Solving:
- Specific heat of metal × 90 g× (34 C -98.6 C)= 4,872.504 J
Specific heat of metal × 5,814 gC= 4,872.504 J
Specific heat of metal = 4,872.504 J÷ 5,814 gC
Specific heat of metal = 0.8381 J/gC
Finally, the specific heat of the metal is 0.8381 J/gC.
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5. Describe the 3rd criterion, ‘Keep costs low’ and explain why it is important.
In business, it is crucial to keep costs low because when costs exceed the profits or income then the business runs out of cash and becomes bankrupt.
What are costs?A cost is the worth of money that has been used up to create something or supply a service and is thus no longer accessible for use in production, research, retail, or accounting.
In business, the cost might be one of acquisition, in which case the money spent to obtain it is recognized as cost.
Businesses incur two sorts of expenses: fixed and variable costs. Variable costs change with production, but fixed costs do not. Overhead expenses are another term for fixed costs.
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Answer the question(s) below about the following reaction.
2H₂O2 → 2H2O + O2
How many moles of oxygen gas can 5.0 moles of hydrogen
peroxide (H2O2) produce, if decomposition is complete?
2.5 moles of oxygen will be produced.
What is the mole ratio?A stoichiometric problem can be characterized by two features: the information given in the problem and the information to be solved called the unknown. Both the given and the unknown can be reactants, both products, or one can be a reactant and the other a product. Quantities of substances can be expressed in moles. However, in laboratory situations, it is common to determine the amount of a substance by determining the mass of the substance in grams. The amount of gaseous substance can be expressed in terms of its volume. This concept focuses on the type of problem where both the given quantity and the unknown quantity are expressed in moles.
The molar ratio is a conversion factor that relates the molar amounts of any two substances in a chemical reaction. The numerical value of the conversion factor is obtained from the coefficients of the balanced chemical equation.
For the given reaction:
2H₂O₂ → 2H₂O + O₂
This reaction indicates that the mole ratio of H₂O₂ to O₂ is 2:1 i.e. for every two moles of H₂O₂ one mole of O₂ is produced.
So, for 5.0 moles of hydrogen peroxide, moles of oxygen will be half of 5.0, which is 2.5 moles.
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Calculate Gibbs energy for the following condition K = 1.7 x 10^2, T = 25 c
The Gibbs free energy of the system is - 12.7 kJ/mol.
What is the Gibbs free energy?The term Gibbs free energy has to do with the amount of thermodynamic work that could be done by a system. We know that we can find the Gibbs free energy by the use of the equilibrium constant and the temperature of the system and that is what we have to do in this question as we do it.
We know that;
ΔG = -RTlnK
ΔG = The Gibbs free energy
R = gas constant
T = temperature
K = equilibrium constant
Thus;
R = 8.314 J/K/Mol
T = 25°C + 273 = 298 K
K = 1.7 x 10^2
When we substitute the values, we have;
ΔG =-(8.314 * 298 * ln 1.7 x 10^2)
ΔG =- 12.7 kJ/mol
We can see from the calculation that we are going to have the Gibbs free energy of the system thus described as - 12.7 kJ/mol.
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Fe(s) + 2 HNO3(aq) →Fe(NO3)2(aq) + H₂(g)
What is the total number of oxygen atoms represented in the formula of the iron
compound produced?
Answer: 6
Explanation:
If we are only looking at the number of oxygen atoms in the product then the answer is 6.
NO3 contains 3 oxygen atoms.
(NO3)2 means that we have 2 NO3 groups which means there are 6 oxygen atoms.
How much water will be needed to make a solution of 5.0 M MgO with 200.0 g MgO?
Volume of water will be needed to make a solution of 5.0 M MgO with 200 g MgO is 25 L.
given that :
molarity of MgO = 5 M
mass of MgO = 200 g
molar mass of MgO = 40 g/mol
number of moles = mass / molar mass
number of moles of MgO = 200 g / 40 g/mol
= 5 mol
molarity of solution is given as :
molarity = moles of solute / volumes in L
volume = moles / molarity
volume = 5 × 5
= 25 L
Thus, Volume of water will be needed to make a solution of 5.0 M MgO with 200 g MgO is 25 L.
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Determine if the following salt is neutral, acidic or basic. If acidic or basic, write the appropriate equilibrium equation for the acid or base that exists when the salt is dissolved in aqueous solution.
C₅H₅NHI
The equation that shows that the salt is acidic is;
C₅H₅NHI + [tex]H_{2} O[/tex] -----> C₅H₅N + [tex]H_{3} O^+[/tex] + [tex]I^-[/tex]
Is the salt acidic?We know that when we dissolve certain salts in water, the salts could form an acidic, basic or a neutral solution depending on the kind of interaction that the salt could have with the solvent.
Looking at the salt C₅H₅NHI, we can see that the salt can interact with water so as to form the acid that is called hydro iodic acid as shown by the equation; C₅H₅NHI + [tex]H_{2} O[/tex] -----> C₅H₅N + [tex]H_{3} O^+[/tex] + [tex]I^-[/tex]
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The autoionization of water is a reversible reaction.
2H₂O ⇌ H3O⁺ + OH⁻
This reaction is endothermic (ΔH is positive).
What is the effect of increasing temperature of water on:
The numerical value of Kw
Answer 1
Choose...
pH
Answer 2
Choose...
[H3O+ ]
Reaction will move forward and favor according to Le Chatelier's principle on increasing temperature of water.
According to Le Chatelier's principle, the position of equilibrium will shift if a system in a state of dynamic equilibrium is disturbed by a change in its conditions. The point of equilibrium will shift toward the products to offset the additional reactant if you raise the concentration of one of the reactants. For instance, extra N2 will react with H2 in the system if it is added. More ammonia will be produced as a result of this.
Similar to this, the location of equilibrium would move to the left if you reduced the concentration of one of the reactants. In this instance, removing N2 would cause more NH3 to break down into the reactants.
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The Mackenzie River in northern Canada contains, on average,
0.820 mM Ca2+
0.430 mM Mg2+
0.300 mM Na+
0.0200 mM K+
0.250 mM Cl–
0.380 mM SO42–
and
1.82 mM HCO3–.
What, on average, is the total mass of these ions in 4.75 L of Mackenzie River water?
On average, the total mass of ions in 4.75 liters of Mackenzie River water is 0.466 g grams.
What is the total mass of ions?The formula mass of an ionic compound is determined in the same manner as the formula mass of a covalent compound is determined: by adding the average atomic masses of all the atoms in the compound's formula.
Hence, the total mass is computed as follows:
(0.820 mM Ca 2⁺) X ( 2.25 L) = 1.845 mmoles at 40.0 g/mol = 73.8 mg
(0.430 mM Mg 2⁺) X ( 2.25 L) = 0.9675 mmoles at 24.3 g/mol = 23.51 mg
(0.300 mM Na⁺) X ( 2.25 L) = 0.675 mmol at 23.0 g/mol = 15.52 mg
(0.0200 mM K⁺) X ( 2.25 L) = 0.045 mmol at 39.1 = 1.75 mg
(0.250 mM Cl-) X ( 2.25 L) = 0.5625 mmol at 35.45 g/mol = 19.94 mg
(0.380 mM SO₄²-) X ( 2.25 L) = 0.855 mmol at 96.06 g/mol = 82.13 mg
(1.82 mM HCO₃ -) X ( 2.25 L) = 4.095 mmol at 61.02 g/mol = 249.87 mg
Thus, total mass = 73.8 + 23.51 + 15.52 + 1.75 + 19.94 + 82.13 + 249.87
= 466.52mg
Converted into grams we have:
466.52/1000
= 0.46652
Hence, on average, the total mass of these ions 4.75 L [tex]\approx[/tex] 0.47 grams.
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This graph shows the displacements and times for the winner of
a horse race.
What was the average speed of the horse that won the race?
O 0.05 m/s
O 20 m/s
O 45 m/s
Question
Seismic waves travel at different speeds according to type.
What is the speed of seismic waves from fastest to slowest?
Responses
S waves, L waves, P waves
S waves, L waves, P waves
P waves, S waves, L waves
P waves, S waves, L waves
L waves, S waves, P waves
L waves, S waves, P waves
P waves, L waves, S waves
Since Seismic waves travel at different speeds according to type, the speed of seismic waves from fastest to slowest is option C: P waves, S waves, L waves.
Which seismic waves are moving more quickly?P waves leave the earthquake first and go the furthest. Rock oscillates perpendicular to the direction of wave propagation in S or shear waves. In rock, S waves typically move at a pace of roughly 60% that of P waves, and they always come after the latter.
Therefore, if we examine a seismogram, we anticipate that the P-wave, which is the quickest wave, will arrive first, followed by the S-wave and then the Love and Rayleigh waves, which are the slowest waves.
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A 135.0-g sample of a metal at 153.0 °C is added to 255.0 g of ethylene glycol (specific heat = 2.43 J/g･ °C) in a calorimeter at 25.7 °C. The temperature of the ethylene glycol rises to 38.2 °C. Calculate the specific heat capacity of the metal, assuming that all the heat lost by the metal is gained by the ethylene glycol.A 135.0-g sample of a metal at 153.0 °C is added to 255.0 g of ethylene glycol (specific heat = 2.43 J/g･ °C) in a calorimeter at 25.7 °C. The temperature of the ethylene glycol rises to 38.2 °C. Calculate the specific heat capacity of the metal, assuming that all the heat lost by the metal is gained by the ethylene glycol.
Answer:
q
=
−
176000
J
×
1
k
J
1000
J
=
−
176
k
J
The specific heat capacity of the metal can be calculated using calorimetric equation. The specific heat capacity of the metal is 0.499 J/g °C.
What is specific heat capacity?Specific heat capacity of a substance is the heat energy required to rise its temperature by one degree Celsius per one gram. It is an intensive property and thus constant for a substance.
The calorimetric equation connecting the mass m, specific heat capacity c, temperature difference ΔT with the heat energy q is written as :
q = m c ΔT .
Given the heat energy of the metal is lost to ethylene glycol. Hence the heat energy change for both of the substance are equal and can be written as follows:
135 g × (153 -38.2 °C ) × c = 255 g × 2.43 J/g °C × (38.2 -25.7 °C)
c = [ 255 g × 2.43 J/g °C × (38.2 -25.7 °C) ] / [ 135 g × (153 -38.2 °C ) ]
= 0.499 J/g °C.
Hence, the specific heat capacity of the metal is 0.499 J/g °C..
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is neon a metal or a non metal
Explanation:
Neon is a non-metal. it belongs to group 8 or 18 of the periodic table of elements and is also referred to as a noble gas.
Imagine you are sitting in a room with a volume of 23000 liters and a temperature of 69 degrees F. The total air pressure is 766 mm Hg, and the partial pressure from oxygen is 21% of the total pressure. How many grams of oxygen are in the room?
The mass (in grams) of oxygen gas in the sitting room of 23000 liters is 6412.16 grams
How do I determine the mass of oxygen gas?We'll begin by converting 69 °F to °C. This can be obtained as follow:
Temperature (°F) = 69 °FTemperature (°C) =?°C = 5/9(°F - 32)
°C = 5/9(69 - 32)
°C = 20.6 °C
Next, we shall determine the mole of oxygen gas in the room. This is shown below:
Volume (V) = 23000 L Temperature (T) = 20.6 °C = 20.6 + 273 = 293.6 KTotal pressure = 766 mmHg = 766 / 760 = 1 atmPercentage of oxygen = 21%Presure of oxygen (P) = 21% × 1 = 0.21 atmGas constant (R) = 0.0821 atm.L/Kmol Number of mole (n) =?PV = nRT
0.21 × 23000 = n × 0.0821 × 293.6
Divide both sides by (0.0821 × 293.6)
n = (0.21 × 23000) / (0.0821 × 293.6)
n = 200.38 moles
Finally, we shall determine the mass of oxygen gas in the room
Mole of oxygen gas = 200.38 moles Molar mass of oxygen gas = 32 g/molMass of oxygen gas =?Mole = mass / molar mass
Cross multiply
Mass = Mole × molar mass
Mass of oxygen gas = 200.38 × 32
Mass of oxygen gas = 6412.16 grams
Thus, the mass of oxygen gas is 6412.16 grams
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Given the equation 4Al+3O2=2Al2O3 How many moles of oxygen are needed to react with 100 grams of aluminum
Taking into account the reaction stoichiometry, 2.778 moles of oxygen are needed to react with 100 grams of aluminum.
Reaction stoichiometryIn first place, the balanced reaction is:
4 Al + 3 O₂ → 2 Al₂O₃
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
Al: 4 molesO₂: 3 molesAl₂O₃: 2 molesThe molar mass of the compounds is:
Al: 27 g/moleO₂: 32 g/moleAl₂O₃: 102 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
Al: 4 moles ×27 g/mole= 108 gramsO₂: 3 moles ×32 g/mole= 96 gramsAl₂O₃: 2 moles ×102 g/mole= 204 gramsMoles of O₂ requiredThe following rule of three can be applied: If by reaction stoichiometry 108 grams of Al react with 3 moles of O₂, 100 grams of Al react with how many moles of O₂?
moles of O₂= (100 grams of Al× 3 moles of O₂)÷ 108 grams of Al
moles of O₂= 2.778 moles
Finally, 2.778 moles of oxygen are needed.
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