A)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
CO2 + H2O → CH2OH + O2
CO 2 + H 2 O → CH 2 OH + O 2
Zn + 2HCl → H2 + ZnCl2
Zn + 2HCl → H 2 + ZnCl 2
Li2CO3 → LiO + CO2
Li 2 CO 3 → LiO + CO 2
CH4 + O2 → CO2 + 2H2O
CH4 + O2 → CO2 + 2H2O
Which statement is true regarding a chemical reaction?(1 point)
Responses
Even if the total number of atoms changes, mass may not be conserved in the reaction.
Even if the total number of atoms changes, 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.
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.
Even if the total number of atoms does not change, 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
215 amu
215 amu
179 amu
179 amu
108 amu
To calculate the total mass of the reactants, you need to find the sum of the individual masses of each element in the reactants.
FeCl3: 1 Fe atom (56 amu) + 3 Cl atoms (35 amu each) = 56 amu + 3(35 amu) = 56 amu + 105 amu = 161 amu
H2O: 3 H atoms (1 amu each) + 1 O atom (16 amu) = 3(1 amu) + 16 amu = 3 amu + 16 amu = 19 amu
Total mass of the reactants = mass of FeCl3 + mass of H2O = 161 amu + 19 amu = 180 amu.
Therefore, the total mass of the reactants is 180 amu.
no the Answer are
161 amu
161 amu
215 amu
215 amu
179 amu
179 amu
108 amu
Apologies for the confusion. The correct answer is 161 amu.
A)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
38 amu
38 amu
228 amu
228 amu
76 amu
76 amu
152 amu
152 amu
The correct answer is 76 amu. In a chemical reaction, the total mass of the reactants is equal to the total mass of the products. Since the total mass of the reactants is 76 amu, the mass of the molecule that is formed is also 76 amu.
The chemical equation where the number of atoms in the reactants is the same as the number of atoms in the products is:
Zn + 2HCl → H2 + ZnCl2
To determine this, count the number of atoms of each element on both sides of the equation:
Reactants:
Zn: 1
H: 2
Cl: 2
Products:
H: 2
Zn: 1
Cl: 2
As you can see, the number of atoms for each element is the same on both sides of the equation. Therefore, the correct answer is:
Zn + 2HCl → H2 + ZnCl2