San Jacinto College

CHEM 1311Exam  1 (Chap. 1, and 2) Spring, 2017

1)Which of the following could be classified as a pure substance:

 

 

1. 1. seawater             b. coins in a piggy bank            c. water vapors          d. gold in a ring                   e. air

 

 

2. Which of the following is an example of a heterogeneous mixture:

 

 

1. 1. Listerine mouthwash                    b. beer                c. carbon                                     d. vinegar                        e. salsa

 

 

3. Which of the following is an example of a physical change:

 

 

1. 1. rusting of iron b. cooking an egg         c. milk going sour d. shredding paper                   e. rotting bananas

 

 

4. Which of the following is the basic unit of mass in the SI system:

 

 

1. 1. liter        b. Kilogram        c. pounds        d. gallons         e. none of these

 

 

5. The measurement 0.000 0043 m, expressed correctly using scientific notation, is

 

 

a. 7 4.3 0 m ???? . b. 6 4.3 m ????? . c. 6 4.3 m ???? d. 5 0.43 m ????? e. 4.3 m.

 

 

6. Which of the following is an alkali metal?
   1. Cu                      b. B                            c. Ga                               d. Fr     e. F
7. When 2610 + 11.7 + 0.22 are added, the final answer is:

a. 2621.92 b. 2621.9 c. 2622 d. 2620 e. 2600

 

 

8. How many pounds are in 3.5 kg? given: 1 lb = 454 g

 

 

1. 1. 0.629 lb b. 1.59 lb c. 7.7 lb d. 1.6 lb e. 7.70 lb                 9. If the temperature of a beaker of water is 65 oC, what is its temperature in Fahrenheit?

a. 149 oF           b. 150 oF             c. 18 oF                d. 18.3 oF              e. 68.1 oF

 

 

 

 

 

 

 

10. Which of the following gives the correct numbers of protons, neutrons, and electrons in a neutral atom of 118 50 Sn?

 

 

a. 118 protons, 50 neutrons, 118 electrons b. 118 protons, 118 neutrons, 50 electrons c. 50 protons, 68 neutrons, 50 electrons d. 68 protons, 68 neutrons, 50 electrons e. 50 protons, 50 neutrons, 50 electrons

 

 

11. An Imaginary Element has two isotopes, 17E and 19E. Calculate the atomic mass of this element. isotopes                       isotopic mass(amu)     abundance(%)

17E                   16.79                 65.90

19E                   18.92                 34.10

a. 17.86 amu        b. 18.93 amu c. 19.40 amu        d. 17.52 amu       e. we cannot calculate the atomic mass

12. How many moles of magnesium is 3.01 x 1022 atoms of magnesium: a. 5.00 x 10-2 b. 1.80 x 10-1 c. 2.50  d. 2.50 x 1024 e 5.00 x 1023
13. What is the mass of 3.5 moles of FeCl3 a. 568 g               b. 570 g                c. 46 g d. 46.3 g e. 320 g
14. How many iron atoms are contained in 354 g of iron?

 

 

a. 2.62 × 1025 Fe atoms b. 2.13 × 1026 Fe atoms c. 4.69 × 1024 Fe atoms d. 3.82 × 1024 Fe atoms e.

9.50 × 1022 Fe atoms

15. Which of the following elements is NOT a metal?

 

 

a. barium           b. cobalt              c. antimony           d. tin             e. aluminium

 

 

16. Which of the following is NOT true for the atoms 13N, 14N, and 15N?

 

 

a. They all have the same atomic number. b. They are isotopes. c. They all have the same mass number.

d. They all have 7 protons. e. They all have 7 electrons.

 

 

17. The number of electrons in an ion with 13 protons and an ionic charge of 3+ is

 

 

a. 16 b. 10 c. 8 d. 18 e. 32

 

 

18. Some elements in group IV A of the periodic table form ions with a charge of

 

 

a. 1+ b. 2+ c. 1- d. 2- e. 3+

19. Which of these isotopes has the greatest of number of neutrons?

a. 38Cl b. 40Ar c. 40K d. 40Ca          e. 38Sc

20. In an atom, the nucleus contains

a. an equal number of protons and neutrons. b. all neutrons.   c. all protons. d. all electrons. e. none of the given answers is correct

 

 

21. Which of the following is properly labeled?

a. Cu - semimetal                             b. Na – alkaline earth metal                 c. Pb - metal                     e. Xe - noble solid                                 e. In – transition metal

 

 

22. To form an ion, a tin atom

 

 

a. gains 1 electron.     b. gains 2 electrons.   c. loses 7 electrons. d. loses 1 electron.      e. loses 2 electrons.

 

23. Which of the following metals commonly forms a +3 charge:

 

 

a. Bi             b. Pb             c. Cs               d. Ba             e. Zn

 

 

24. The mass number is equal to

 

 

a. the sum of the number of the electrons and protons. b. the sum of the number of the neutrons and electrons. c. the sum of the number of protons, neutrons, and electrons. d. the sum of the number of protons and neutrons. e. number that shows position of an element in the periodic table.

 

 

25. If an object has a density of 8.65 g/cm3, what is its density in units of kg/m3?

 

 

a. 8.65 × 10-3 kg/m3  b. 8.65 × 10-7 kg/m3  c. 8.65 × 103 kg/m3 d. 8.65 × 101 kg/m3  e. 8.65 × 10-1

kg/m3

 

 

 

 

Bonus Questions –

 

 

Q1. What is the mass of 2.00 L of an intravenous glucose solution with a density of 1.15 g/mL?

 

 

a. 0.023 kg b. 2.30 kg c. 1.15 kg d. 0.015 kg e. 0.58 kg

 

 

Q2. What does "X" represent in the following symbol? X

a. silicon b. sulfur c. zinc d. ruthenium e. nickel

 

 

Q3. The outside air temperature is 40°F, what is the temperature in Kelvin? (4 points)

 

 

a. 313 K b. 377 K c. 281 K d. 278 K e. 657 K