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
30 grams
30 grams
15 grams
15 grams
10 grams
10 grams
60 grams
60 grams
ANSWERS 100%
1.30 grams
2.they are rearranged
3. Mass is converted
4. The atoms of the reactants are regrouped during the reaction
5. 4
The total mass of the products is 60 grams.
Use the chemical reaction to answer the question.
4Fe+3O2→2Fe2O3
What happens to atoms of Fe and O2 during the reaction?
(1 point)
Responses
They maintain their properties.
They maintain their properties.
They are rearranged.
They are rearranged.
They gain mass.
They gain mass.
They are lost.
They are rearranged.
Which is most likely to occur during a chemical reaction?(1 point)
Responses
New atoms are created.
New atoms are created.
The original substance maintains its properties.
The original substance maintains its properties.
Mass is conserved.
Mass is conserved.
Atoms of the original substance are lost.
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
The atoms of the reactants are regrouped during the reaction.
The atoms of the reactants are regrouped during the reaction.
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.
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
4
4
8
8
2
2
5