Chemical Equation
Balancing Equation
Chemical Reaction
Formula
100
2. In the reaction described by the word equation sodium + water  sodium hydroxide + hydrogen gas a. sodium hydroxide is a product. b. sodium is a product. c. water is a reactant. d. Both (a) and (c)
What is d. Both (a) and (c)
100
3. Which of the following indicates that a chemical equation is balanced? a. The numbers of atoms of each element are the same on both sides of the equation. b. All of the coefficients are the same. c. The numbers of molecules on each side of the equation are equal. d. The sums of the coefficients on each side of the equation are equal.
What is a. The numbers of atoms of each element are the same on both sides of the equation.
100
1. You mix solution A with solution B in a beaker. Which of the following observations does not help you prove that a chemical reaction has occurred? a. The beaker becomes warm. b. You see gas bubble out of solution. c. Solution A, solution B, and the mixture are all yellow. d. None of the above; all help prove that a chemical reaction has occurred.
What is d. None of the above; all help prove that a chemical reaction has occurred.
100
9. In an ionic compound, the chemical formula represents a. one molecule of the compound b. one formula unit of the compound c. the simplest ratio of positive to negative ions in the compound d. both b and c are correct
What is d. both b and c are correct
200
4. From a complete and correctly written chemical equation, you can obtain the a. chemical formulas of the reactants and products. b. relative amounts of the reactants and products. c. physical states of the reactants and products. d. All of the above
What is d. All of the above
200
5. To balance a chemical equation, you must a. adjust the subscripts. b. adjust the number of products. c. adjust the number of reactants. d. adjust the coefficients.
What is d. adjust the coefficients.
200
The formation of a solid product in a chemical reaction is represented by the symbol a. (aq). b. (↓). c. (S). d. b and c
What is d. b and c
200
when writing the ionic formula a. the net charge must be zero b. the total positive charge equals the total negative charge c. the cation is written first followed by the anion d.all off the above are true
What is d.all off the above are true
300
7. In the expression 3CO2, the numbers 3 and 2 are, respectively, a. a subscript and a coefficient. b. a coefficient and a subscript. c. two subscripts. d. two coefficients.
What is b. a coefficient and a subscript.
300
Which of the following equations represents the balanced equation for the reaction of iron and oxygen? a. 2Fe + O2  Fe2O3 b. Fe + 3O2  Fe2O3 c. 4Fe + 3O2  2Fe2O3 d. 3Fe + 3O2  2Fe2O3
What is c. 4Fe + 3O2  2Fe2O3
300
19. The coefficients in a chemical equation represent the a. masses, in grams, of all reactants and products. b. relative numbers of moles of reactants and products. c. number of atoms in each compound in a reaction. d. number of valence electrons involved in the reaction
What is b. relative numbers of moles of reactants and products.
300
13. Choose the formula that correctly represents the compound formed from ions Sr2+ and Se 2- a. SrSe b. Sr2Se2 c. Se2Sr2 d. SeSr
What is a. SrSe
400
21. In the equation 2Al2O3  4Al + 3O2, what is the mole ratio of aluminum to oxygen? a. 10:6 b. 3:4 c. 2:3 d. 4:3
What is d. 4:3
400
18. A balanced chemical equation allows one to determine the a. mole ratio of any two substances in the reaction. b. energy released in the reaction. c. electron configuration of all elements in the reaction. d. mechanism involved in the reaction.
What is a. mole ratio of any two substances in the reaction.
400
22. What is the mole ratio of H2O to H3PO4 in the following chemical equation? P4O10 + 6H2O  4H3PO4 a. 4 to 6 b. 1 to 6 c. 3 to 2 d. 2 to 3
What is c. 3 to 2
400
17. Which solution would be least likely to carry an electric current? a. NaCl b. HCl c. C6H12O6 d. CsI
What is c. C6H12O6
500
14. The large numbers in front of some of the formulas are called_____________. a. coefficient b. subscript c. reactant d. yield sign
What is a. coefficient
500
12. The following chemical balanced Al + O2  Al2O3 a. True b. False
What is b. False
500
11. Which of the following is not a type of chemical reaction a. Synthesis reaction b. decomposition reaction c. single replacement d. endothermic reaction
What is d. endothermic reaction
500
15. Which is the correct name for the following molecular compound, N2O3 a. dinitrogen trioxygen b. dinitrogen trioxide c. nitrogen two oxygen three d. trinitrogen dioxide
What is b. dinitrogen trioxide
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