In which chemical equation is the number of atoms in the reactants the same as the number of atoms in the products?(1 point)
Responses
Li2CO3 → LiO + CO2
CO 2 + H 2 O → CH 2 OH + O 2
CH 4 + O 2 → CO 2 + 2H 2 O
Zn + 2HCl → H2 + ZnCl2
The chemical equation in which the number of atoms in the reactants is the same as the number of atoms in the products is "Zn + 2HCl → H2 + ZnCl2."
In which chemical equation is the number of atoms in the reactants the same as the number of atoms in the products?(1 point)
Responses
Li2CO3 → LiO + CO2
Li 2 CO 3 → LiO + CO 2
CO2 + H2O → CH2OH + O2
CO 2 + H 2 O → CH 2 OH + O 2
CH4 + O2 → CO2 + 2H2O
CH 4 + O 2 → CO 2 + 2H 2 O
Zn + 2HCl → H2 + ZnCl2
The chemical equation in which the number of atoms in the reactants is the same as the number of atoms in the products is "Zn + 2HCl → H2 + ZnCl2."
Which statement is true regarding a chemical reaction?(1 point)
Responses
Even if the total number of atoms does not change, mass may not be 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.
The total number of atoms changes, so mass is conserved in the reaction.
The total number of atoms does not change, so mass is 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 changes, mass may not be conserved in the reaction
The statement that is true regarding a chemical reaction is: "The total number of atoms does not change, so mass is conserved in the reaction."
Which statement is true regarding a chemical reaction?(1 point)
Responses
Even if the total number of atoms does not change, mass may not be 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.
The total number of atoms changes, so mass is conserved in the reaction.
The total number of atoms does not change, so mass is 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 changes, mass may not be conserved in the reactio
The statement that is true regarding a chemical reaction is: "Even if the total number of atoms changes, mass may not be conserved in the reaction."
Use the equation and the table to answer the question.
FeCl3 + 3H2O → Fe(OH)3 + 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)
Responses
161 amu
161 amu
179 amu
179 amu
108 amu
108 amu
215 amu
To find the total mass of the reactants, we need to calculate the total mass of FeCl3 and the total mass of 3H2O.
The total mass of FeCl3 can be calculated as follows:
Mass of FeCl3 = (mass of Fe) + 3 * (mass of Cl)
= 56 + 3 * 35
= 56 + 105
= 161 amu
The total mass of 3H2O can be calculated as follows:
Mass of 3H2O = 3 * [2 * (mass of H) + (mass of O)]
= 3 * [2 * 1 + 16]
= 3 * [2 + 16]
= 3 * 18
= 54 amu
Therefore, the total mass of the reactants is the sum of the mass of FeCl3 and the mass of 3H2O:
Total mass of reactants = Mass of FeCl3 + Mass of 3H2O
= 161 + 54
= 215 amu
Hence, the total mass of the reactants is 215 amu.
Question
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)
Responses
152 amu
152 amu
38 amu
38 amu
76 amu
76 amu
228 amu