Unit 1 Exam: Gen Chem Review Version B

1. Write the formula for:
 acetic acid

2. Phosphoric acid can be prepared by reaction of sulfuric acid with “phosphate rock” according to the equation:
	Ca3(PO4)2 + 3H2SO4 ® 3CaSO4 + 2H3PO4
 Suppose the reaction is carried out starting with 103 g of Ca3(PO4)2 and 75.0 g of H2SO4. Which substance is the limiting reactant?

[A] H3PO4

[B] CaSO4

[C] Ca3(PO4)2

[D] H2SO4

[E] none of these

3. How many grams of Ca(NO3)2 can be produced by reacting excess HNO3 with 7.40 g of Ca(OH)2?

[A] 8.22 g

[B] 16.4 g

[C] 7.40 g

[D] 32.8 g

[E] 10.2 g

4. An isotope, X, of a particular element has an atomic number of 7 and a mass number of 15. Therefore,

[A] X is an isotope of nitrogen.

[B] X has 8 neutrons per atom.

[C] X has an atomic mass of 14.0067.

[D] a, b, and c

[E] a and b

5. The first scientist to show that atoms emit any negative particles was

[A] Ernest Rutherford.

[B] John Dalton.

[C] Lord Kelvin.

[D] J. J. Thomson.

[E] William Thomson.

6. The number of neutrons in an atom is the same for all neutral atoms of that element.

[A] True

[B] False

7. All of the following are in aqueous solution. Which is incorrectly named?

[A] H2SO3, sulfurous acid

[B] HClO3, chloric acid

[C] HNO2, nitrous acid

[D] HBr, bromic acid

[E] HC2H3O2, acetic acid

8. Convert 16.8 lb to g. (1 lb = 453.6 g)

[A] 762.0 g

[B] 7620 g

[C] 7621 g

[D] 76.2 g

[E] 3.70 ´ 104 g

9. The density of a liquid is determined by successively weighing 25, 50, 75, 100, and 125 mL of the liquid in a 250-mL beaker. Plot volume of liquid along the horizontal axis, and total mass of beaker plus liquid on the vertical axis. Which of the following is true?

[A] The plot should be linear because the mass of the beaker stays constant.

[B] The plot should be rather linear because the slope measures the density of a liquid.

[C] The plot should be curved upward because the mass of the liquid is higher in successive trials.

[D] The plot should be curved upward because the slope measures the density of a liquid.

[E] none of these

10. Name the following compounds:
 Al2(SO4)3

11. Consider the element indium, atomic number 49, atomic mass 114.8 g. The nucleus of an atom of indium-112 contains

[A] 49 protons, 49 neutrons.

[B] 49 protons, 49 alpha particles.

[C] 49 protons, 112 neutrons.

[D] 49 protons, 63 neutrons, 49 electrons.

[E] 49 protons, 63 neutrons.

12. Which of the following pairs of compounds can be used to illustrate the law of multiple proportions?

[A] H2O and HCl

[B] NH4 and NH4Cl

[C] ZnO2 and ZnCl2

[D] NO and NO2

[E] CH4 and CO2

13. A hydrocarbon (a compound consisting solely of carbon and hydrogen) is found to be 85.6% carbon by mass.  What is the empirical formula for this compound?

[A] CH

[B] CH6

[C] C3H

[D] C6H

[E] CH2

14. Which metals form cations with varying positive charges?

[A] metalloids

[B] Group 2 metals

[C] transition metals

[D] Group 3 metals

[E] Group 1 metals

15. Write the formula for:
 cobalt (II) chloride

16. A 0.4647-g sample of a compound known to contain only carbon, hydrogen, and oxygen was burned in oxygen to yield 0.8635 g of CO2 and 0.1767 g of H2O. What is the empirical formula of the compound?

[A] C6H3O2

[B] CHO

[C] C2H2O

[D] C3H3O2

[E] C3H6O2

17. Adipic acid contains 49.32% C, 43.84% O, and 6.85% H by mass. What is the empirical formula?

[A] C3H5O2

[B] C3HO3

[C] C2H5O4

[D] C2HO3

[E] C3H3O4

18. Given the equation 3A + B ® C + D, you react 1 mole of A with 3 moles of B. True or false: A is the limiting reactant because you have fewer moles of A than B.

[A] True

[B] False

19. Which of the following statements is (are) true?

[A]  and  have the same number of neutrons.

[B]  and  are isotopes of each other because their mass numbers are the same.

[C]  has the same number of electrons as 

[D] a and c

[E] a and b

20. Using the rules of significant figures, calculate the following: 4.0021 - 0.004

[A] 3.9981

[B] 3.998

[C] 4

[D] 4.00

[E] 4.0

21. You heat 3.970 g of a mixture of Fe3O4 and FeO to form 4.195 g Fe2O3.  The mass of oxygen reacted is

[A] 0.475 g.

[B] 1.00 g.

[C] 0.225 g.

[D] cannot be determined

[E] none of these

22. A piece of indium with a mass of 16.6 g is submerged in 46.3 cm3 of water in a graduated cylinder. The water level increases to 48.6 cm3. The correct value for the density of indium from these data is:

[A] 0.138 g/cm3

[B] 7.217 g/cm3

[C] 0.14 g/cm3

[D] more than 0.1 g/cm3 away from any of these values.

[E] 7.2 g/cm3

Reference: 2.8
[1] CH3COOH

Reference: 3.9
[2] [D]

Reference: 3.8
[3] [B]

Reference: 2.5
[4] [E]

Reference: 2.4
[5] [D]

Reference: 2.5
[6] [B]

Reference: 2.8
[7] [D]

Reference: 1.6
[8] [B]

Reference: [1.52]
[9] [B]

Reference: 2.8
[10] aluminum sulfate

Reference: 3.1
[11] [E]

Reference: 2.2
[12] [D]

Reference: 3.5
[13] [E]

Reference: 2.7,2.8
[14] [C]

Reference: 2.8
[15] CoCl2

Reference: 3.5
[16] [D]

Reference: 3.5
[17] [A]

Reference: 3.9
[18] [A]

Reference: 2.5
[19] [D]

Reference: 1.5
[20] [B]

Reference: 3.8
[21] [C]

Reference: 1.5,8
[22] [E]