Name:    Online Study Guide - Sig Figs, Dimensional Analysis, & Density

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

1.

How many significant digits are there in the following number: 15.30 g
 a. 1 c. 3 b. 2 d. 4

2.

How many significant digits are in the following number: 1000 lbs
 a. 1 c. 3 b. 2 d. 4

3.

How many significant digits are in the following number: 0.00032 m
 a. 1 c. 5 b. 2 d. 6

4.

How many significant digits are in the following number: 1.67 x 10-2 m
 a. 0 c. 2 b. 1 d. 3

5.

Express the following number in ordinary notation : 5.99 x 103
 a. 599 c. 5990 b. 0.599 d. 0.00599

6.

Perform the following calculation. Place your answer in the correct number of significant digits and in the correct unit : 15.996 g - 5.72 g
 a. 10.28 g c. 10.3 g2 b. 10.275 g d. 10.3 g

7.

Perform the following calculation. Place your answer in the correct number of significant digits and in the correct unit : (2.65 ´ 106) +  (3.97 ´ 105
 a. 3.047 x 106 c. 3047000 b. 3.05 x 106 d. 3.047 x 10-6

8.

Perform the following calculation. Place your answer in the correct number of significant digits and in the correct unit : (5.26 ´ 10–8) ´ (8.3 ´ 10–3
 a. 4.37 x 10-9 c. 4.37 x 1014 b. 4.4 x 10-9 d. 4.4 x 1014

9.

Perform the following calculation. Place your answer in the correct number of significant digits and in the correct unit : 145.00 g / 120 mL
 a. 1.2 g/ml c. 1 g/ml b. 1.21 g/ml d. 1.208 g/ml

10.

Claculate the number of kilometers in 3.69 m
 a. 0.0369 km c. 3690 km b. 0.00369 km d. 369 km

11.

How many seconds are in 22 days?
 a. 15840 sec c. 31680 sec b. 1.9 x 106sec d. 528 sec

12.

Convert 100 nm into mm
 a. 0.0001 mm c. 1 x 10-7mm b. 1 x 10-8mm d. 1 x 10-10mm

13.

Convert 40.0ºC to Kelvin
 a. 175 K c. 215 K b. 313 K d. -233 K

14.

Ethyl aclohol boils at 78.5 ºC. Convert this to Fahrenheit.
 a. 109 ºF c. 173 ºF b. 25.9 ºF d. 199 ºF

15.

You have a 55.0 g sample of ethanol. If the density of ethanol is 0.7893 g/ml, what volume of ethanol do you have?
 a. 69.7 mL c. 43.4 mL b. 0.0144 mL d. 10.6 mL

16.

A piece of metal with a mass of 38.5 g is placed in a 50.0 mL graduated cylinder. The water level rises from 20.0 mL to 35.5 mL. What is the density of the metal?
 a. 0.770 g/ml c. 1.93 g/ml b. 0.922 g/ ml d. 1.19 g/ml

17.

To determine density, the quantities that must be measured are
 a. mass and weight. c. volume and concentration. b. volume and weight. d. volume and mass.

18.

If some measurements agree closely with each other but differ widely from the actual value, these measurements are
 a. neither precise nor accurate c. accurate, but not precise. b. acceptable as a new standard of accuracy. d. precise, but not accurate.

19.

Expressed in scientific notation, 0.0930 m is
 a. 93 x  10-3 m. c. 9.30 x  10-2 m. b. 9.3 x  10-3 m. d. 9.30  x 10-4 m.

20.

A standard for comparison that helps to ensure that the experimental result is caused by the condition being tested is the ____.
 a. constant c. dependant variable b. control d. hypothesis

21.

An object has a mass of 48 kilograms on Earth. What is this object’s mass on the moon? (The gravitational pull on the moon is1/6 that of the gravitational pull on Earth.)
 a. 48 kilograms c. 8 pounds b. 48 pounds d. 8 kilograms

22.

A biologist is studying how earthworms behave in response to moisture. Which of the following is the dependent variable in this experiment?
 a. the earthworm’s behavior c. the temperature of the room b. the amount of moisture d. the earthworm

23.

A means of expressing numbers as a multiple of two factors: a number between 1 and 10; and ten raised to a power, or exponent
 a. base unit c. dimensional analysis b. derived unit d. scientific notation

24.

You calculate that 139 000 000 m is the answer to a problem. You are asked to write your answer in scientific notation. Which answer is correct?
 a. 1.39 x 108 c. 14 x 1010 b. 13.9 x 1010 d. 1.4 x 108

25.

Refers to how close a measured value is to an accepted value
 a. percision c. derived unit b. accuracy d. dimensional analysis