Question
In which chemical equation is the number of atoms in the reactants the same as the number of atoms
in the products?(1 point)
Zn + 2HCl → H + ZnCl 2 2
CH4 + O2 → CO2 + 2H2O
CO2 + H2O → CH2OH + O2
Li2CO3 → LiO + CO2
in the products?(1 point)
Zn + 2HCl → H + ZnCl 2 2
CH4 + O2 → CO2 + 2H2O
CO2 + H2O → CH2OH + O2
Li2CO3 → LiO + CO2
Answers
Answer
Which statement is true regarding a chemical reaction?(1 point)
Even if the total number of atoms does not change, mass may not be conserved in the reaction.
The total number of atoms changes, so mass is conserved in the reaction.
Even if the total number of atoms changes, mass may not be conserved in the reaction.
The total number of atoms does not change, so mass is conserved in the reaction
Even if the total number of atoms does not change, mass may not be conserved in the reaction.
The total number of atoms changes, so mass is conserved in the reaction.
Even if the total number of atoms changes, mass may not be conserved in the reaction.
The total number of atoms does not change, so mass is conserved in the reaction
Answer
Use the equation and the table to answer the question.
FeCl + 3H O → Fe(OH) + 3HCl
Element Mass of an Atom (amu)
Fe 56
Cl 35
H 1
O 16
Iron chloride and water react according to the equation shown. The table shows the atomic masses of
the elements involved in the reaction. What is the total mass of the reactants?
(1 point)
3 2 3
179 amu
215 amu
108 amu
161 amu
FeCl + 3H O → Fe(OH) + 3HCl
Element Mass of an Atom (amu)
Fe 56
Cl 35
H 1
O 16
Iron chloride and water react according to the equation shown. The table shows the atomic masses of
the elements involved in the reaction. What is the total mass of the reactants?
(1 point)
3 2 3
179 amu
215 amu
108 amu
161 amu
Answer
In a chemical reaction, two molecules with a total mass of 76 amu react to form a single molecule.
What is the mass of the molecule that is formed?(1 point)
228 amu
152 amu
76 amu
38 amu
What is the mass of the molecule that is formed?(1 point)
228 amu
152 amu
76 amu
38 amu
Answered by
GPT-4o mini
To determine which of the given chemical equations has the same number of atoms on both sides (reactants and products), we can count the number of each type of atom in both sides of each equation.
1. **Zn + 2HCl → H + ZnCl2**
- Reactants: Zn (1), H (2), Cl (2) = Total 5 atoms
- Products: H (1), Zn (1), Cl (2) = Total 4 atoms
- **Not balanced.**
2. **CH4 + O2 → CO2 + 2H2O**
- Reactants: C (1), H (4), O (2) = Total 7 atoms
- Products: C (1), H (4), O (4) = Total 9 atoms
- **Not balanced.**
3. **CO2 + H2O → CH2OH + O2**
- Reactants: C (1), O (3), H (2) = Total 6 atoms
- Products: C (1), O (3), H (2) = Total 6 atoms
- **Balanced.**
4. **Li2CO3 → LiO + CO2**
- Reactants: Li (2), C (1), O (3) = Total 6 atoms
- Products: Li (1), O (1), C (1), O (2) = Total 4 atoms
- **Not balanced.**
Therefore, the equation in which the number of atoms in the reactants is the same as the number of atoms in the products is:
**CO2 + H2O → CH2OH + O2**
1. **Zn + 2HCl → H + ZnCl2**
- Reactants: Zn (1), H (2), Cl (2) = Total 5 atoms
- Products: H (1), Zn (1), Cl (2) = Total 4 atoms
- **Not balanced.**
2. **CH4 + O2 → CO2 + 2H2O**
- Reactants: C (1), H (4), O (2) = Total 7 atoms
- Products: C (1), H (4), O (4) = Total 9 atoms
- **Not balanced.**
3. **CO2 + H2O → CH2OH + O2**
- Reactants: C (1), O (3), H (2) = Total 6 atoms
- Products: C (1), O (3), H (2) = Total 6 atoms
- **Balanced.**
4. **Li2CO3 → LiO + CO2**
- Reactants: Li (2), C (1), O (3) = Total 6 atoms
- Products: Li (1), O (1), C (1), O (2) = Total 4 atoms
- **Not balanced.**
Therefore, the equation in which the number of atoms in the reactants is the same as the number of atoms in the products is:
**CO2 + H2O → CH2OH + O2**
Answered by
GPT-4o mini
The correct statement regarding a chemical reaction is:
**The total number of atoms does not change, so mass is conserved in the reaction.**
This aligns with the Law of Conservation of Mass, which states that in a chemical reaction, the total mass of the reactants equals the total mass of the products, meaning that the number of atoms remains constant throughout the reaction, even if they are rearranged to form new substances.
**The total number of atoms does not change, so mass is conserved in the reaction.**
This aligns with the Law of Conservation of Mass, which states that in a chemical reaction, the total mass of the reactants equals the total mass of the products, meaning that the number of atoms remains constant throughout the reaction, even if they are rearranged to form new substances.
Answered by
GPT-4o mini
To find the total mass of the reactants in the given chemical equation \( \text{FeCl} + 3\text{H}_2\text{O} \rightarrow \text{Fe(OH)} + 3\text{HCl} \), we need to calculate the mass of each reactant based on the atomic masses provided:
1. **Iron Chloride (FeCl)**
- Mass of Fe: 56 amu
- Mass of Cl: 35 amu
- Total mass of FeCl: \( 56 + 35 = 91 \, \text{amu} \)
2. **Water (H₂O)**
- Mass of H: 1 amu (For 2 H: \( 2 \times 1 = 2 \, \text{amu} \))
- Mass of O: 16 amu
- Total mass of H₂O: \( 2 + 16 = 18 \, \text{amu} \)
- Since there are 3 water molecules: \( 3 \times 18 = 54 \, \text{amu} \)
Now, we can sum the total mass of the reactants:
- Total mass of reactants = Mass of FeCl + Mass of 3H₂O
- Total mass = \( 91 \, \text{amu} + 54 \, \text{amu} = 145 \, \text{amu} \)
None of the provided options match the calculated total mass of 145 amu for the reactants. Please double-check the equation you provided or consider if there may be a mistake in the options given.
1. **Iron Chloride (FeCl)**
- Mass of Fe: 56 amu
- Mass of Cl: 35 amu
- Total mass of FeCl: \( 56 + 35 = 91 \, \text{amu} \)
2. **Water (H₂O)**
- Mass of H: 1 amu (For 2 H: \( 2 \times 1 = 2 \, \text{amu} \))
- Mass of O: 16 amu
- Total mass of H₂O: \( 2 + 16 = 18 \, \text{amu} \)
- Since there are 3 water molecules: \( 3 \times 18 = 54 \, \text{amu} \)
Now, we can sum the total mass of the reactants:
- Total mass of reactants = Mass of FeCl + Mass of 3H₂O
- Total mass = \( 91 \, \text{amu} + 54 \, \text{amu} = 145 \, \text{amu} \)
None of the provided options match the calculated total mass of 145 amu for the reactants. Please double-check the equation you provided or consider if there may be a mistake in the options given.
Answered by
GPT-4o mini
According to the Law of Conservation of Mass, in a chemical reaction, the total mass of the reactants must equal the total mass of the products.
Given that the two molecules react to form a single molecule and have a total mass of 76 amu, the mass of the molecule that is formed will also be 76 amu.
Therefore, the correct answer is:
**76 amu**.
Given that the two molecules react to form a single molecule and have a total mass of 76 amu, the mass of the molecule that is formed will also be 76 amu.
Therefore, the correct answer is:
**76 amu**.