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)
Responses

Zn + 2HCl → H2 + ZnCl2
Zn + 2HCl → H 2 + ZnCl 2

CH4 + O2 → CO2 + 2H
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.
Answer
Use the equation and the table to answer the question.
FeCly + 3H20 - Fe(OH)з + 3НС|
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?
• 108 amu
• 161 amu
• 179 amu
• 215 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)
• 152 amu
• 228 amu
• 38 amu
• 76 amu
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