Chemistry Multiple Choice?

Question

14. which gas will diffuse mostly rapidly at the same temperature and pressure?
a)fluorine, F2
b) Chlorine Cl2
c) ammonia, NH3
d)nitrogen(II) oxide NO

15. Which household product contains acetic acid, CH3COOH?
a) bleach
b) vinegar
c) drain cleaner
d) household ammonia

16. When the expression is balanced using smallest whole numbers, what is the coefficient of CO?
_K2CO3 + _C > _CO + _K
a)2
b)3
c)4
d)6

17. A 500.oo cm3 container is filled with 2.20 g of carbon dioxide gas, CO2 at 127 C. What is the pressure exerted by the gas?
a) 3.32 x 10^-1 kPa
b) 1.06 x 10^2 kPa
c) 3.32 x 10^2 kPa
d) 1.46 x 10^4 kPa

19. What is the empirical formula of a compound that contains 6.42 g sulfur, S, and 22.8 g flourine, F?
a)SF2
b)SF3
c) SF4
d)SF6

20. what is the total number of electrons in a sodium ion, Na+?
a) 1
b) 10
c) 11
d) 12

21. what mass of water is released, when 10.0 g of MgSO47H2O is completely dehydrated?
MgSO47H20 > MgSO4 + 7H2O
a)0.0407 g
b)0.285 g
c) 5.12 g
d) 51.1 g

Answer 1

14.)C; its the lightest

15.)B;vinegar IS acetic acid

16.)B; K2CO3 + 2C -> 3CO + 2K

17.)C;nRT / V = (2.20 / 44.009)(.0821)(400) / (.5 L) = 3.28 atm = 3.32 x 10^2 kPa

19.)D
6.42 / 32.06 = .200 moles S
22.8 / 18.998 = 1.2 moles F
1.2 moles / .2 moles = 6 = SF6

20.)B; normally Na has 11 electrons but since it has a + charge it has one less electron so 11 - 1 = 10

21.) C; 10 / 246.472 = .0405 * 7 * 18.015g = 5.116 = 5.12 g

Answer 2

Molecular weights: F2 = 38; Cl2 = 71; NH3 = 17; NO = 30. So NH3.

Answer 3

examinations.ie they are exam papers from different years and you can get the answers when you are done. they are really handy

Answer 4

14. c
15.b
16. b
17. c
20. c