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1. A chemical equation is balanced by…..
a. changing the subscript c. adjusting the coefficient
b. adding another substance d. alter the mass of atoms
2. Which of the following statements if not true about a balanced equation?
a. Reactant and products have the same kind of elements
b. Reactants and products have the same number of atoms of each element
c. Reactants and products have the same mass
d. Reactants and products have the same subscript
3. How many oxygen atoms are produced in the reaction 2HNO3 + Ca(OH)2 → Ca(NO3)2 + 2H2O?
a. 5 b. 6 c. 7 d. 8
4. The following incident happened in a dump site except for one, which one is it?
a. Mass of the garbage can decrease without decreasing its volume
b. Volume of the garbage decrease as its mass decreases
c. Volume of the garbage decrease as its actual mass remain the same
d. Mass of the garbage increase as its volume decreases
5. Molecular weight is equal to …..
a. Mass of one mole of compounds in the equation
b. The mass in grams of 1 mole of the particular substance which is obtained by adding the atomic weights of the atoms specified in the formula
c. Mass obtained by multiplying the mass of a compound to its coefficient
d. None of the above
6. If a reaction produce NaCO3 with 36 grams of C, how much oxygen are in the compound?
a. 16 b. 96 c. 144 d. 192
7. Empirical formula ……
a. Shows the actual number of atoms of each element in a compound
b. Is commonly used in expressing chemical reactions
c. Contain the most simplified mole ration of elements on the compound
d. Could still be further simplified to a smaller number ratio
8. Which is the same among compounds with the same empirical formula but different molecular formula?
a. kind of elements c. subscript
b. mass d. chemical properties
9. What is the Law of Chemical Change that states that matter cannot be created nor destroyed?
a. Law of Conservation of Energy c. Law of Multiple Proportion
b. Law of Definite Proportion d. Law of Conservation of Mass
10. Which of the following pairs of compounds represents the Law if Multiple Proportions?
a. KOH, NaOH c. NaCl, CaSO4
b. H2O, H2O d. Fe2+, Fe3+
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