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WorksheetsChemical Reactions
Total questions: 10
Worksheet time: 5mins
What is a chemical reaction?
a process of bonding substances together
a process that leads to filled valence shells
a process that releases or consumes energy
all of the choices
What is a chemical equation?
a diatomic molecule
a shorthand representation of a chemical bond
a shorthand representation of a chemical reaction
a substance
What are substances on the left side of a chemical equation called?
electrons
groups
products
reactants
What are substances on the right side of a chemical equation called?
electrons
groups
products
reactants
What does the number in front of the molecular symbol mean?
It shows that there is only one molecule present in a reaction
It shows the number of molecules in the reaction
It shows the number of reactions that took place
All of the choices
Can the subscripts in a chemical reaction be changed?
Cannot be determined
Maybe, depending on the energy released
No, they define the molecules in the reaction
Yes, to balance the equation
Chemical reactions proceed under the law of definite proportions:
always
cannot be determined
never
sometimes
16.05 g of methane reacts completely with 64.00 g of oxygen to form carbon dioxide and water. What will be the total weight of the CO2 and H2O?
80.05
64
16.05
the weight cannot be determined
What is a limiting reactant?
a reagent that is found in excess in a chemical reaction
a reagent that will be consumed completely during a reaction
a reagent that is not present
all of the choices
When this equation (C3H8 + O2 -> CO2 + H2O ) is balanced, the coefficient in front of carbon dioxide is:
1
12
3
6
