Chemical Reactions Quick Check
Science 8 Q1 / Matter Interactions
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
60 grams
10 grams
30 grams
15 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 are lost.
They are rearranged.
They gain mass.
They maintain their properties.
Which is most likely to occur during a chemical reaction?(1 point)
Responses
Mass is conserved.
New atoms are created.
The original substance maintains its properties.
Atoms of the original substance are lost.
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.
The atoms of the reactants are regrouped during the reaction.
Atoms of Na are destroyed during the reaction.
Some atoms gain mass after 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
2
8
5
There are 4 atoms of hydrogen present after the reaction.
what is the answer to each question
The answer to the first question: The total mass of the products is 60 grams.
The answer to the second question: The atoms of Fe and O2 are rearranged during the reaction.
The answer to the third question: Mass is conserved during a chemical reaction.
The answer to the fourth question: The atoms of the reactants are regrouped during the reaction.
The answer to the fifth question: There are 4 atoms of hydrogen present after the reaction.
use the recommended questions and tell me the correct answer for each question
The total mass of the products in the chemical reaction CaCO3 -> CO2 + CaO is 60 grams.
During the reaction 4Fe + 3O2 -> 2Fe2O3, the atoms of Fe and O2 are rearranged.
Most likely to occur during a chemical reaction is that mass is conserved.
In the chemical reaction NaHCO3 + HC2H3O2 -> NaC2H3O2 + H2O + CO2, the statement that is correct is that the atoms of the reactants are regrouped during the reaction.
After the reaction 2H2 + O2 -> 2H2O, there are 4 atoms of hydrogen (H) present.
The answer to number 1 is 30 grams :)
I apologize for the confusion. Here are the correct answers for each question:
1) The total mass of the products is 60 grams.
2) Atoms of Fe and O2 are rearranged during the reaction.
3) Mass is conserved during a chemical reaction.
4) The atoms of the reactants are regrouped during the reaction.
5) There are 4 atoms of hydrogen present after the reaction.