1. It is a process in which a substance or substances is/are changed into one or more new substances.
a. chemical equation
b. chemical reaction
c. chemical formula
d. chemical compound
2. What does a plus sign indicates in a chemical equation?
a. produces
b. yields
c. reacts
d. a and b
3. Which of the following is used to tell that a substance is dissolved in water?
a. g
b. s
c. l
d. aq
4. The starting material in a chemical reaction is called
a. reactants.
b. products.
c. subscript.
d. coefficient.
5. The substance/s formed in a chemical reaction is called
a. reactants
b. products
c. subscript
d. coefficient
6. Chemical equation should conform with what law?
a. Law of Conservation of Energy
b. Law of Difinite Composition
c. Law of Multiple Proportion
d. Law of Conservation of Mass
7. How is balancing equation done?
a. by changing the subscript of some molecules
b. by writing the coefficient before the formula or symbol
c. by writing the coefficient after the formula or symbol
d. b or c
8. Which of the following equation is balanced?
9. What does this equation mean?
N2 + 5 O2 >>> N2O5
a. Two moles of nitrogen react with 5 moles of oxygen to form dinitrogen pentaoxide.
b. One mole of nitrogen gas reacts with 5 moles of oxygen gas to form one mole of dinitrogen pentaoxide.
c. Nitrogen and oxygen reacts to form nitrogen oxide.
d. Reaction of Nitrogen and oxygen produces dinitrogen pentaoxide
10. Which of the following is the balanced equation between the reaction of Carbon monoxide and oxygen gas?
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