Exam 1

Chapter 1

100

Based on the following equations, what does x equal?

3x + 6 = 2y - 2

y=2x - 4

a) 14

b) 15

c) 16

d) 17

e) 18

c) 16

200

What is the 302,000 in scientific notation?

3.02 x 10^5

300

What is the value of x?

2x + 4 = (8x + 2)/2

x = 3/2

400

What is 2.3 x 10^-4 in standard notation?

a) 2,300

b) 23,000

c) 0.0023

d) 0.00023

d) 0.00023

500

label the x and y axis on a graph.

y | ___

       x

Chapter 4

100

Of the elements B, C, F, Li, and Na, what is the element with the smallest atomic radius?

a) B

b) C

c) F

d) Li

3) Na

c) F

200

What element has the following electron configuration?

1s²2s²2p²

a) boron

b) carbon

c) oxygen

d) nitrogen 

e) fluorine

b) carbon

300

Chlorine has two naturally occurring isotopes. The isotope Cl-36 (mass = 36.0 amu) makes up 75.8% of the sample and the isotope Cl-38 (mass = 38.0 amu) makus up 24.2% of the sample. What is the average atomic mass for chlorine?

36.5 amu

400

How many protons are in an isotope of sodium with a mass number of 25?

a) 32

b) 25

c) 15

d) 14

e) 11

e) 11

500

What is the number of valence electrons for an element that has the electron configuration

1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁵

A) 2 valence electrons

B) 5 valence electrons

C) 7 valence electrons

D) 15 valence electrons

E) 17 valence electrons

C) 7 valence electrons

3.1 & 3.2

100

The primary substances of which all other composed of are…

a) Compounds

b) Molecules

c) Electrons

d) Elements

e) Protons

d) Elements

200

Which have a definite shape?

a) gas

b) liquid

c) solid

d) b & c

e) all of the above

c) solid

300

Which have a definite volume?

a) gas

b) liquid

c) solid

d) b & c

e) all of the above

d) b & c

400

Which of the following statements regarding mixtures is TRUE?

A) salt water is an example of a heterogenous mixture.

B) cereal is an example of a homogenous mixture.

C) A mixture is a combination of two or more substances in which each substance does not retain its own chemical identity.

D) A homogeneous mixture has a uniform composition thus its components are evenly distributed.

E) Gasoline is an example of a heterogeneous mixture.

D) A homogeneous mixture has a uniform composition thus its components are evenly distributed.

500

Which of these are chemical changes?

a) burning coal for heat

b) melting an ice cube

c) digesting a piece of cake

d) dissolving salt into water

a & c