Use the chemical reaction to answer the question.
CaCO3→CO2+CaO
A scientist heats 30 grams of calcium carbonate (CaCO3
) in the chemical reaction shown. What is the total mass of the products?
(1 point)
Responses
10 grams
10 grams
30 grams
30 grams
15 grams
15 grams
60 grams
The total mass of the products in the chemical reaction is 60 grams.
Which is most likely to occur during a chemical reaction?(1 point)
Responses
Atoms of the original substance are lost.
Atoms of the original substance are lost.
New atoms are created.
New atoms are created.
Mass is conserved.
Mass is conserved.
The original substance maintains its properties.
Mass is conserved.
Use the chemical reaction to answer the question.
NaHCO3+HC2H3O2→NaC2H3O2+H2O+CO2
A student mixes baking soda (NaHCO3
) and acetic acid (HC2H3O2
) to produce a chemical reaction shown. Which statement about the reaction is correct?
(1 point)
Responses
There are more H atoms after the reaction.
There are more H atoms after the reaction.
Some atoms gain mass after the reaction.
Some atoms gain mass after the reaction.
Atoms of Na are destroyed during the reaction.
Atoms of Na are destroyed during the reaction.
The atoms of the reactants are regrouped during the reaction.
The atoms of the reactants are regrouped during the reaction.
Use the chemical reaction to answer the question.
2H2+O2→2H2O
There are four atoms of hydrogen (H
) before the reaction. How many atoms of hydrogen are present after the reaction?
(1 point)
Responses
5
5
2
2
4
4
8
There are four atoms of hydrogen present after the reaction.
Use the chemical reaction to answer the question.
H2O2→H2O+O2
Which equation for this reaction demonstrates the Law of Conservation of Mass?
(1 point)
Responses
2H2O2→2H2O+2O2
2 cap h sub 2 cap o sub 2 rightarrow 2 cap h sub 2 cap o plus 2 cap o sub 2
2H2O2→2H2O+O2
2 cap h sub 2 cap o sub 2 rightarrow 2 cap h sub 2 cap o plus cap o sub 2
H2O2→H2O+O2
H2O2→H2O+O2
H2O2→H2O+2O2
The equation that demonstrates the Law of Conservation of Mass is:
2H2O2 → 2H2O + O2