Answer:
See below
Explanation:
Q = m c T c = specific heat T = temp change Q = heat joules
32 = 4 c 40 c = .2 J/g-C
314 to 344 k is a change of 30 K
Q = m c T
= 4 * .2 * 30 = 24 Joules
Answer:
(a) 0.2 J/g°K
(b) 24 J
Explanation:
(a)
To find the specific heat capacity, you need to use the following equation:
Q = mcΔT
In this formula,
-----> Q = heat energy (J)
-----> m = mass (g)
-----> c = specific heat capacity (J/g°K)
-----> ΔT = change in temperature (K)
You can plug the given values into the equations and simplify to find the missing value.
Q = 32 J c = ? J/g°K
m = 4.0 g ΔT = 40 K
Q = mcΔT <----- Equation
32 J = (4.0 g) x c x (40 K) <----- Insert variables
32 J = (160) x c <----- Multiply 4.0 and 40
0.2 = c <----- Divide both sides by 160
(b)
To find the energy of the same sample, you can use the same equation. This time, you know the specific heat capacity, have a different change in temperature, and are solving for energy (Q).
Q = ? J c = 0.2 J/g°K
m = 4.0 g ΔT = 344 K - 314 K = 30 K
Q = mcΔT <----- Given equation
Q = (4.0 g)(0.2 J/g°K)(30 K) <----- Insert values
Q = 24 <----- Multiply
If you start with 4 moles of iron and 3 moles of oxygen to produce iron oxide, what is the limiting reagent? (You will need to balance the equation first.) Fe + O2 -> Fe2O3
A. they are equal
B.Fe
C. O2
D.Fe2O3
The correct statement regarding the limiting reactant for the reaction between 4 moles of iron and 3 moles of oxygen is: They are both equal. (Option A)
Balanced equationWe'll begin by writing the balanced equation for the reaction between iron and oxygen. This is given below:
4Fe + 3O₂ --> 2Fe₂O₃
SUMMARY
From the balanced equation above,
4 moles of Fe reacted with 3 moles of O₂
How to determine the limiting reactantThe limiting reactant is the reactant that is consumed completly in a chemical reaction.
The limiting reactant can be obtain as illustrated below:
From the balanced equation above,
4 moles of Fe reacted with 3 moles of O₂
From the illustration above, we can see that 3 moles of Fe required 4 moles of O₂ for complete reaction.
Thus, Fe and O₂ are both the limiting reactant.
Therefore, we can conclude that Fe and O₂ are equal
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PLEASE HELP!!!
A sample of nitrogen at 20.0 °C has a volume of 588 mL at a pressure of 924 mmHg. To change the volume to 1008 mL, what must be the new pressure?
Answer:
539 mmHg
Explanation:
Using Boyle's Law,
(588)(924)=(1008)(pressure)
So, the pressure is 539 mmHg.
For any spontaneous process, universe entropy intensifies is known as the __________ law of thermodynamics.
Group of answer choices
fourth
second
tenth
For any spontaneous process, universe entropy intensifies is known as the second law of thermodynamics.
What is entropy?Entropy is defined as the degree of randomness or disorderliness of a system.
The entropy of a system generally increases for any spontaneous process.
This is according to the second law of thermodynamics.
In conclusion, the entropy of a system is the a measure of randomness of the system.
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How many atoms of oxygen are present in 7.51 grams of
glycine with formula C₂H5O2N?
1.205 × 10²³ atoms of oxygen will be present in 7.51 grams of glycine with formula C₂H5O2N. Details about number of atoms can be found below.
How to calculate number of atoms?
The number of atoms of a substance can be calculated by multiplying the number of moles of the substance by Avogadro's number.
However, the number of moles of oxygen in glycine can be calculated using the following expression:
Molar mass of C₂H5O2N = 75.07g/mol
Mass of oxygen in glycine = 32g/mol
Hence; 32/75.07 × 7.51 = 3.2grams of oxygen in glycine
Moles of oxygen = 3.2g ÷ 16g/mol = 0.2moles
Number of atoms of oxygen = 0.2 × 6.02 × 10²³ = 1.205 × 10²³ atoms
Therefore, 1.205 × 10²³ atoms of oxygen will be present in 7.51 grams of glycine with formula C₂H5O2N.
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The molar heat of fusion of gold is 12.550 kJ mol–1. At its melting point, how much mass of melted gold must solidify to release 235.0 kJ of energy?
The mass of melted gold to release the energy would be 3, 688. 8 Kg
How to determine the massThe formula for quantity of energy is given thus;
Q = n × HF
Where n represents number of moles
HF represents heat of fusion
To find the number of moles, we have
235.0 = n × 12.550
number of moles = [tex]\frac{235}{12. 550}[/tex] = 18. 725 moles
Note that molar mass of Gold is 197g/ mol
Let's note that;
Number of moles = mass/ molar mass
Mass = number of moles × molar mass
Mass = 18. 725 × 197
Mass = 3, 688. 8 Kg
Thus, the mass of melted gold to release the energy would be 3, 688. 8 Kg
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 what will happen to mangroves if nearby a coral reefs are destroyedSedimentation will occur in international zones instead of mangroves mangroves will improve without the filter ration that coral reefs provide mangrove receive less sunlight due to the increased true Bility in the water storm surges can just write mangroves along the coast line during storms
The thing that will happen to mangroves if nearby a coral reefs are destroyed is that:
Option C: Reefs will receive less sunlight due to increased turbidity in the water.How does the destruction of coral reefs occurs?The destruction that is known to have taken place in mangrove forests in the area of the coastal wetlands is known to be one that is highly depleting the amount of natural tannins in the water.
Due to the above, this is known to have subjected the close by coral reefs to have what we call an undue UV radiation. Its effect is that the reefs are said to be sunburned a lot and then the coral bleaching takes place.
Therefore, The thing that will happen to mangroves if nearby a coral reefs are destroyed is that Option C: Reefs will receive less sunlight due to increased turbidity in the water.
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Put the following energy sublevels in order from least to greatest energy.
A. 1s, 2s, 3s, 4s, 2p, 3p, 4p, 3d, 4d, 4f
B. 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 4d, 4f
C. 1s, 2s, 2p, 3s, 3p, 3d, 4s, 4p, 4d, 4f
D. None of these
The correct order is 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 4d, 4f. The correct option is B.
Order of energy sublevelsThe correct order of energy sublevel is 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p.
Thus, with the exclusion of 5s, 5p, 6s, 5d, 6p, 7s, 5f, 6d, and 7p, what we have left in order of increasing energy is 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 4d, 4f.
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The correct order from least to greatest energy for the energy sublevels is; 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 4d, 4f (Option B).
What is the Aufbau principle?The Aufbau principle offers a method in which the energy levels in an atoms are arranged from the least to the greatest. We know that electrons are filled into orbitals in order of increasing energy.
Thus, the correct order from least to greatest energy for the energy sublevels is; 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 4d, 4f (Option B).
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A piece of string is found to be 35.9 meters long. How long is the string in inches?
Answer: 1413.39 inches
Explanation:
Formula for converting meters to inches
Meters x 39.37 (roughly) = Value in inches
Applying formula
35.9 meters x 39.37 = 1413.39 inches (roughly)
If there are 21.5 grams of citric acid in 0.500 liters of lemon juice, what is the molarity of citric acid (H3C6H5O7) in lemon juice? (rounded to 3 sig figs) (Don’t forget to convert the grams of citric acid into moles.)
The molarity of citric acid in lemon juice is 0.222 mol/L.
What is Molarity ?Molarity (M) is defined as the number of moles of solute dissolved in 1L of solution. Molarity is also known as Molar concentration. The S.I unit of Molarity is molar (M) or mol/L.
How to find the Molarity ?Molarity = [tex]\frac{\text{Number of moles}}{\text{Liters of solution}}[/tex]
Number of moles = [tex]\frac{\text{Given mass}}{\text{Molar mass}}[/tex]
= [tex]\frac{21.5\ g}{192\ \text{g/mol}}[/tex]
= 0.111 mol
Now put the values in above formula we get
Molarity = [tex]\frac{\text{Number of moles}}{\text{Liters of solution}}[/tex]
= [tex]\frac{0.111\ mol}{0.5\ L}[/tex]
= 0.222 mol/L
Thus from the above conclusion we can say that The molarity of citric acid in lemon juice is 0.222 mol/L.
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What are the coefficients needed to balance this equation: NH3 +0₂ → N₂ + H₂O?
Answer:
4 NH₃ + 3 O₂ -----> 2 N₂ + 6 H₂O
Explanation:
An equation is balanced when there is an equal amount of each element on both sides of a reaction. To balance the elements, you can add coefficients to modify the amount of elements/molecules present. It is important to have the smallest coefficients possible.
The unbalanced equation:
NH₃ + O₂ -----> N₂ + H₂O
Reactants: 1 nitrogen, 3 hydrogen, 2 oxygen
Products: 2 nitrogen, 2 hydrogen, 1 oxygen
The balanced equation:
4 NH₃ + 3 O₂ -----> 2 N₂ + 6 H₂O
Reactants: 4 nitrogen, 12 hydrogen, 6 oxygen
Products: 4 nitrogen, 12 hydrogen, 6 oxygen
When ATP breaks down to ADP, potential energy stored in bonds is released. This energy stored in bonds is
What kind of reactions takes place between Calcium and EDTA?
Answer:
Explanation:
:Determination of total calcium and magnesium Ion concentration
Answer:
Ca2+ ions react to form a stronger complex with the EDTA
Explanation:
As a result, when the calcium ion–PR complex is titrated with EDTA the Ca2+ ions react to form a stronger complex with the EDTA. For the titration, the indicator is added to the sample solution containing the calcium ions and forms the pink/red calcium ion-indicator complex (Ca-PR).
Determine the empirical formula of a compound containing 40.6 grams of carbon, 5.1 grams of hydrogen, and 54.2 grams of oxygen.
In an experiment, the molar mass of the compound was determined to be 118.084 g/mol. What is the molecular formula of the compound?
For both questions, show your work or explain how you determined the formulas by giving specific values used in calculations.
The Empirical formula of compound is C₁H₂O₁. The Molecular Formula of the compound is 4 (C₁H₂O₁).
What is Empirical Formula ?Empirical formula is the simplest whole number ratio of atoms present in given compound.
Element % Atomic mass Relative no. of atoms Simplest whole ratio
C 40.6 12 [tex]\frac{40.6}{12}[/tex] = 3.3 [tex]\frac{3.3}{3.3} = 1[/tex]
H 5.1 1 [tex]\frac{5.1}{1}[/tex] = 5.1 [tex]\frac{5.1}{3.1} = 2[/tex]
O 54.2 16 [tex]\frac{54.2}{16}[/tex] = 3.3 [tex]\frac{3.3}{3.3} = 1[/tex]
The Empirical formula of compound is C₁H₂O₁ or CH₂O
How to find the Molecular formula of compound ?Molecular formula = Empirical formula × n
[tex]n = \frac{\text{Molecular weight}}{\text{Empirical Formula weight}}[/tex]
[tex]= \frac{118.084}{30}[/tex]
= 4
Molecular formula = n × Empirical formula
= 4 (C₁H₂O₁)
Thus from the above conclusion we can say that The Empirical formula of compound is C₁H₂O₁. The Molecular Formula of the compound is 4 (C₁H₂O₁).
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a gas has a density of 3.21 g/L at stp what is the gas
The gas is bromine. (This is a fact)
Question 5
Now, provide the following information about your chosen molecule: Percent composition of each element
The molecule is water. Molecular formula of water is H₂O. Molecular weight of water is 18 g. The percentage composition of hydrogen and oxygen in water is 11.11 % and 88.89 %. Intermolecular force in water is dipole-induced dipole and London dispersion.
Which molecule is Vital to human body ?Name of the molecule is Water. Molecular formula of the compound is H₂O.
What is the Molecular mass of water ?Molecular mass of H₂O = 2 × Atomic weight of H + Atomic weight of O
= 2 × 1 + 16
= 2 + 16
= 18
The water molecule is Covalent because hydrogen atoms share electrons with the oxygen atom.
How to find the percentage composition ?Percentage composition = [tex]\frac{\text{Mass of element}}{\text{Molar Mass}}[/tex]
Now,
Molar mass of Water = 18
Percentage composition of hydrogen = [tex]\frac{2}{18} \times 100[/tex]
= 11.11 %
Percentage composition of Oxygen = [tex]\frac{16}{18} \times 100[/tex]
= 88.89 %
In water molecule dipole-induced dipole and London dispersion forces are present because water has H-bonds.
The given molecule is water. Water is important for human body to keep a normal temperature. It carries nutrients. It protects our body organs and tissues. The function of water is to serves a s a lubricant. It helps to prevent constipation. It makes up Saliva.
Thus from the above conclusion we can say that The molecule is water. Molecular formula of water is H₂O. Molecular weight of water is 18 g. The percentage composition of hydrogen and oxygen in water is 11.11 % and 88.89 %. Intermolecular force in water is dipole-induced dipole and London dispersion.
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Disclaimer: The question was given incomplete on the portal. Here is the complete question.
Questions: Choose one molecule that is vital to the human body. Provide the following information: Name of the molecule
Now, provide the following information: Molecular formula
Now, provide the following information about your chosen molecule: Molecular mass
Now, provide the following information about your chosen molecule: The type of molecule (covalent or ionic)
Now, provide the following information about your chosen molecule: Percent composition of each element
Now, provide the following information about your chosen molecule: Intermolecular forces within the molecular
Now, provide the following information about your chosen molecule: Describe why the molecule is important and its function within the human body.
the proper answer gets marked brainiest, answer what the question is asking.
What classifies a substance as an element?
What classifies a substance as a compound?
Actually, answer what the question is asking and give a short answer. No copying and pasting.
A substance is an element if it consists of a single type of atom. A substance is a compound if it is made up of more than one element.
Elements and compoundsIn chemistry, an element is defined as all pure substances consisting of the same atom. For example, magnesium and potassium metal are all elements because they consist of magnesium and potassium atoms only.
On the other hand, compounds are defined as substances consisting of 2 or more atoms of different elements. For example, sodium chloride consists of atoms of sodium and chlorine. Hence, it is considered to be a compound.
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The concentration of an HCl acid solution is initially 6mol/L. What would the concentration of a new solution be if 200 mL of the original HCl solution is diluted with 1L of water.
Taking into account the definition of dilution, the concentration of the new solution is 1 mol/L.
DilutionWhen it is desired to prepare a less concentrated solution from a more concentrated one, it is called dilution.
Dilution is the process of reducing the concentration of solute in solution, which is accomplished by simply adding more solvent to the solution at the same amount of solute.
In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volume (and weight) of the solution increases.
A dilution is mathematically expressed as:
Ci×Vi = Cf×Vf
where
Ci: initial concentrationVi: initial volumeCf: final concentrationVf: final volumeFinal volumeIn this case, you know:
Ci= 6 mol/LVi= 200 mLCf= ?Vf= 1 L (1000 mL) water + 200 mL of HCL= 1200 mLReplacing in the definition of dilution:
6 mol/L× 200 mL= Cf× 1200 mL
Solving:
(6 mol/L× 200 mL)÷ 1200 mL= Cf
1 mol/L= Cf
In summary, the concentration of the new solution is 1 mol/L.
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3. What is the molar mass of Li2SO4? (2 points)
O 54.9 g/mol
103.0 g/mol
O109.9 g/mol
O 206.1 g/mol
Answer:
C.) 109.9 g/mol
Explanation:
The molar mass is the sum of each element's atomic weight times their quantity. There is one atom of each element unless denoted by subscripts.
Atomic Mass (Li): 6.9410 g/mol
Atomic Mass (S): 32.065 g/mol
Atomic Mass (O): 15.998 g/mol
Molar Mass (Li₂SO₄): 2(6.9410 g/mol) + 32.065 g/mol + 4(15.998 g/mol)
Molar Mass (Li₂SO₄): 109.939 g/mol
I need help with the solution
Answer:
1
Explanation:
The empirical formula describes the simplest whole number ratio of each type of atom in a compound. To find this formula, you need to (1) convert grams of each element to moles (via their atomic masses) and then (2) find the ratio of each element (by dividing each molar value by the smallest mole value).
(Step 1)
Atomic Mass (Zn): 65.380 g/mol
Atomic Mass (C): 12.011 g/mol
Atomic Mass (O): 15.998 g/mol
10.40 grams Zn 1 mole
------------------------ x ------------------------ = 0.159 moles Zn
65.380 grams
1.92 grams C 1 mole
--------------------- x ----------------------- = 0.160 moles C
12.011 grams
7.68 grams O 1 mole
---------------------- x ------------------------ = 0.480 moles O
15.998 grams
(Step 2)
0.159 moles Zn / 0.159 = 1 atom Zn
0.160 moles C / 0.159 = 1 atom C
0.480 moles O / 0.159 = 3 atom O
The empirical formula is Zn₁C₁O₃. Therefore, the value that should be in the space is 1.
For each pair of molecules given in the table below, identify the correct relationship.
For each pair of molecules given in the table below, the correct relationships are identified as follows.
The relationships between the molecules are given as?These are structural isomers. This is because, they have the same molecular formula (C₆H₁₂) but possess varying structures.The given pair of molecules posses similar formula (C₄H₁₀O) and can be superimposed on one another via rotation of the entire molecule, hence they are identical isomers.In this case the pair of molecules possess similar molecular formula (C₄H₁₀O) and similar arrangement of atoms. Hence, they are identical isomers.This case also features structural isomers. They both contain the same carbon chain with similar formula - C₃H₆BrClThese pair as identical isomers. They are also derived from C₃H₆BrCl.This pair are called stereoisomers isomers. This is because they contain the same about of molecules but are different in the position of the alcohol (-OH) group. But more importantly, the position of the bonding is the same.This set is a functional pair. This is because the composition of the molecules present in each case are different.This is also a functional pair.What is a molecules?A molecule is a bonded collection of atoms that represents the smallest fundamental unit of a chemical compound that may participate in a chemical process.
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1. How many grams are in 5.17 moles of C12H22O11?
Answer:
1768.14
Explanation:
1. molar mass of C₁₂H₂₂O₁₁ is: M=12*12+22*1+16*11=342 [gr/mol];
2. the required mass, m=M*ν is: m=5.17*342=1768.14 [gr].
I need help with homework
The equation that conforms with the particle model is 4C + 6O2 ----> 4CO2 + 2O2.
What is a chemical reaction?The term chemical reaction has to do with the combination of substances to give products. We know that reactants and products must follow the law of conservation of mass.
Hence, the equation that conforms with the particle model is 4C + 6O2 ----> 4CO2 + 2O2.
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What color does red cabbage juice make when mixed with a citrus cleaner?
Answer: PINK
Explanation:
What classifies a substance as an element?
What classifies a substance as a compound?
Actually, answer what the question is asking and give a short answer. No copying and pasting.
Elements cannot be broken down into simpler substances by any or series of chemical reactions.
A compound can be broken done by chemical reactions
Element and compoundAn element can be defined as species of atoms having a certain number of protons in their nuclei and pure substance of that species.
Elements cannot be broken down into simpler substances by any or series of chemical reactions.
A compound can be defined as a chemical substance that is composed of numerous identical molecules containing atoms from more than one element and held together by chemical bonds.
A compound can be broken done by chemical reactions
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9.42 g of lead (ii) nitrate was reacted with 0.655 mol/L potassium iodide to produce 2.64 g of precipitate. What volume of potassium iodide was used in this reaction?
The volume of potassium iodide used will be 0.087 L or 87 mL
Stoichiometric calculationThe equation of the reaction goes thus: [tex]Pb(NO_3)_2(aq) + 2KI --- > PbI_2(s) + 2KNO_3(aq)[/tex]
The mole ratio of the 2 reactants is 1:2.
Mole of 9.42 g [tex]Pb(NO_3)_2[/tex] = 9.42/331.2 = 0.02844 mol
Equivalent mole of KI = 0.02844 x 2 = 0.05688 mol
Volume of 0.05688 mol, 0.655 mol/L KI = 0.05688/0.655 = 0.087 L or 87 mL
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first law of thermodynamics with pressure volume equation
The first law of thermodynamics with pressure volume equation is written as E = Q - PΔV.
What is first law of thermodynamics?The first law of thermodynamics states that energy cannot be created or destroyed, but it can be transformed from one form to another.
It also states that the internal energy (E) is equal to the difference of the heat transfer (Q) into a system and the work (W) done by the system.
E = Q - W
The first law of thermodynamics with pressure volume equation is given as;
W = PΔV
E = Q - PΔV
Thus, the first law of thermodynamics with pressure volume equation is written as E = Q - PΔV.
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The second order reaction A → Products takes 13.5 s for the concentration of A to decrease from 0.740 M to 0.319 M. What is the value of k for this reaction?
The rate constant of the second order reaction is 0.137 M-1s-1.
What is the rate constant?For the second order reaction we can write;
1/[A] = kt + 1/[A]o
[A]o = initial concentration
[A] = final concentration
k = rate constant
t = time
Now;
1/0.319 = 13.5k + 1/ 0.740
1/0.319 - 1/0.740 = 13.5k
3.13 - 1.35 = 13k
k = 3.13 - 1.35/13
k = 0.137 M-1s-1
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which element is trigonal pyramidal molecular shape ? a) NF3. b) BCL3 c) COCL2 d) CLO3- e) BRF3
Answer:
A.) NF₃
D.) ClO₃⁻
Explanation:
To determine the molecular shape of the molecules, you need to:
1.) Calculate the total valence electrons in the molecule
-----> The sum of the element's valence electrons
2.) Draw the Lewis structure
The cell membrane is
a)semi permeable
b)selectively permeable
Answer:
A. Semi Permeable.
Explanation:
Cell membranes are semi permeable.
Select all the correct answers.
A worker is holding a filled gas cylinder still. Which two sentences are true about the energy of the filled gas cylinder?
A man in a blue dress holding a red color cylinder
It has no energy because it’s being held still.
It has gravitational potential energy because of its height.
Its atoms and molecules have thermal energy.
It has motion energy because it will fall if let go.
Its kinetic energy is being converted to potential energy.
Reset Next
The true statements are:
It has gravitational potential energy because of its height.Its atoms and molecules have thermal energy.What is energy?Energy is the ability to do work.
Energy can exist in many form, two of which are kinetic and potential energy.
The worker is holding a filled gas cylinder still gives the gas potential energy by lifting it above the ground.
The molecules of the gas also has kinetic energy by virtue of their constant random motion resulting in thermal energy.
In conclusion, the energy of the filled gas is both potential and kinetic.
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