Name___________________________________                             

Preliminary Topics

DIRECTIONS: Circle the answer that best completes each statement.



1. 1000.
  (a) contains four significant figures.
  (b) is the number of grams in a kilogram.
  (c) = 1.000 X 10 4.
  (d) is the product of (2.000 X 10-4)(5.000 X 107).

a,b,&d			a&b			b,c,&d			b&c


2. 2.0 X 10-3
  (a) contains one significant figure.
  (b) is the number of L in 2.0 ml.
  (c) = 0.0020.
  (d) is the product of 2.0(1.0 X 10-3).

a,b,&c			a,c,&d			b,c,&d			a&c


3. A solution of 2.5 g of table sugar dissolved in 5.0 ml of water contains a
    sugar concentration of
  (a) 0.50 mg/ml.
  (b) 0.50 g/ml.
  (c) 5.0 X 102 mg/cm3.
  (d) 5.0 X 102 g/L.

a&b			b&c			a,b,&d			b,c,&d


Use the following table to answer Questions 4 & 5.

Density of various common substances at 20oC.
Substance	Density (g/cm3)
Water		1.00
Magnesium	1.74
Aluminum	2.70
Lead		11.34
Mercury	13.6


4. At 20oC
  (a) 1.0 ml of magnesium has a greater mass than 1.0 ml of aluminum.
  (b) 13.6 ml of water has a greater mass than 1.0 ml of lead.
  (c) 0.1 ml of lead has a greater mass than 1.0 ml of water.
  (d) 10 ml of magnesium has a greater mass than 1.0 ml of mercury.

a&b			a,b,&d			b,c,&d			all of the
									above	
	
5.  At 20oC
  (a) 1 g of lead has a greater volume than 1 g of mercury.
  (b) 1 g of water has a greater volume than 1 g of air.
  (c) 1 L of air has a greater volume than 1 L of water.
  (d) 100 g of magnesium has a greater volume than 100 g of water.

a only			a&c			b&d			c only


6. Which of the following are pure substances?
  (a) wine
  (b) water
  (c) blood
  (d) iron

b&d			b only			b,c,&d			all of the
									above


7. Which of the following are elements?
  (a) water
  (b) sugar
  (c) table salt (NaCl)
  (d) the atmosphere

a&d			b&d			b only			none of 
									the above

8. Which of the following are heterogeneous?
  (a) gold
  (b) gasoline
  (c) a solution of ethanol and water
  (d) water

a&c			b&c			 a,b,&d			none of
									the above

9. 0 K is
  (a) the freezing point of water.
  (b) -273oC.
  (c) zero Kelvins.
  (d) -180oC.

c only			a&c			c&d			a,b,&c


10. Which of the following statements are false?
  (a) Grams are a measure of mass.
  (b) Millimeters are a measure of volume.
  (c) Cubic centimeters are a measure of density.
  (d) (85 - 84)oF = (85 - 84)oC

all of the			b only			b,c,&d			b&c
above


11. Which of the following numbers have three significant figures?
  (a) 1,050
  (b) 1,150
  (c) 0.005
  (d) 1,050,100

all of the			b&d			a,b&d		a&b
above


12. Which of the following are physical properties?
  (a) combustibility
  (b) heat conductivity
  (c) length
  (d) brittleness

all of the			b,c&d			b&d		a,b&d
above


13. Which of the following are chemical changes?
  (a) milk souring
  (b) silver tarnishing
  (c) butter melting
  (d) coal burning

a,b&d			all of the			b,c&d		a&b
			above


14. Which of the following are exact numbers?
  (a) There are 12 eggs in a dozen.
  (b) The boiling point of methylene chloride is 42oC.
  (c) Neil Armstrong was on the moon for 2 hours, 31 minutes.
  (d) Pikes Peak in Colorado is 14,110 ft above sea level.

a&b			a&c			all of the		a only
						above


15. Which of the following represents the greatest percent uncertainty?
  (a) A thermometer reading of 100oC + 3oC.
  (b) The specific heat of Cd is measured to be 0.197 J/g.Co
        (the theoretical value is 0.231 J/g.Co).
  (c) The melting point of tin is measured to be 244oC (the theoretical 
         value is 232oC).
  (d) A balance measured the mass of a 1.000 g standard as 0.9981 g.

a			b			c			d


16. Which quantity in Question 15 represents the least percent uncertainty?

a			b			c			d

  		  

17. The answers to which of the following will have three significant figures?
  (a) (6.022 X 1023) (2.61 X 108)
  (b) 6.314 X 10-4 + 6.94 X 10-1 + 2.6501 X 103
  (c) (9.42 X 102 + 1.62 X 104) / 4.1
  (d) 485 / 9.231

a&b			c&d			a,b&d			a&d


18. Which of the following hypotheses could be tested?
  (a) Bill Russell was a better basketball player than Magic Johnson.
  (b) I can read your mind.
  (c) In the year 2020, there will be 14 billion people living on earth.
  (d) Eating carrots prevents colon cancer.

a,c&d			a&d			b,c&d			c&d


19. Which of the following statements are true?
  (a) 301 m < 0.300 km
  (b) 29.56 g < 29,56 kg
  (c) 3.54 g/L < 3.54 g/cm3
  (d) 525 mm < 5.25 X 10-3 km

a&b			b&d			b,c&d			a,c&d


20. Which of the following are units of volume?
  (a) kJ
  (b) m3
  (c) atm
  (d) ml

c&d			b&d			a,b&d			b&c