Chem Chapter 1

 

Multiple Choice

Identify the letter of the choice that best completes the statement or answers the question.

 

____          1.      A physical property of zinc metal is _____.

a.	its color	c.	how it reacts with nitrogen gas
b.	whether it burns	d.	whether it changes when placed into acid

 

 

____          2.      Which of the following materials cannot be broken down into a simpler form?

a.	compound	c.	mixture
b.	solution	d.	element

 

 

____          3.      An example of a chemical change is _____.

a.	melting	c.	burning
b.	electrical conductivity	d.	density

 

 

____          4.      An example of a chemical formula is _____.

a.	Na	c.	H2SO4
b.	4.5 g/mL	d.	d = 13.6 g/L

 

 

____          5.      The density of a material depends on _____.

a.	its mass only	c.	its mass and volume
b.	its volume only	d.	its weight

 

 

____          6.      The alloy brass is made from copper and zinc. Brass is a(n) _____.

a.	compound	c.	mixture
b.	element	d.	substance

 

 

____          7.      When ice melts and becomes liquid water, it has undergone a _____.

a.	chemical change	c.	physical change
b.	chemical property	d.	physical property

 

 

____          8.      In ocean water, salt is a(n) _____.

a.	alloy	c.	solution
b.	solute	d.	solvent

 

 

____          9.      Sugar, which is a substance, can be broken down into carbon, oxygen, and hydrogen. Sugar is a(n) _____.

a.	compound	c.	mixture
b.	element	d.	solution

 

 

____          10.      How many atoms are present in one unit of sodium sulfate, Na₂SO₄?

a.	1	c.	4
b.	2	d.	7

 

 

____          11.      Which of the following liquids is most volatile?

a.	alcohol	c.	cooking oil
b.	motor oil	d.	water

 

 

____          12.      A 26.0-g sample of a liquid was found to have a volume of 13.0 mL. What is the density of the liquid?

a.	0.500 g/mL	c.	39.0 g/mL
b.	2.00 g/mL	d.	338 g/mL

 

 

Short Answer

 

Explain how the two terms in the following pairs relate to one another.

 

                  13.      chemical property and physical property

 

                  14.      pure substance and element

 

                  15.      Na and NaCl

 

                  16.      endothermic and exothermic

 

Problem

 

The lists give the density of selected substances. Answer the following questions.

 

Substance	Density (g/mL)
water (at 4.0ºC)	1.000
hydrogen	0.00090
carbon dioxide	XXX
gasoline	0.68
copper	8.89
silver	10.5
mercury	13.595
tungsten	19.3

 

 

                  17.      Which of the substances listed has the greatest density? the lowest density?

 

                  18.      If you were given a milliliter of copper and a milliliter of silver, which would weigh more?

 

                  19.      Corks are used on fishing lines because they float. What can you say about the density of cork?

 

                  20.      Suppose that 10 mL of each of the three liquids in the table—water, gasoline, and mercury—were all placed in a test tube. The liquids do not mix with one another. In the three layers that would be produced, which liquid would be on top, which in the middle, and which on the bottom?