Module 1

Question 1

Which of the following contains no matter?

a. baseball
b. a balloon full of air
c. heat
d. a light ray

Answer 1

d + c

Question 2

In the metric system, what do each of the prefixes mean?

Answer 2

micro - one millionths
milli - one thousandths
centi - one hundredths
deci - one tenths
deca - ten
hecta - one hundred
kilo - one thousand
mega - one million

Question 3

Which has more liquid: a glass holding 0.05kL or a glass holding 12,000mL?

Answer 3

0.05kL 1,000L 1,000mL
———- X ———– X ————- = 50,000mL 0.05kL
1 1kL 1L

Question 4

List the base metric units used to measure length, mass, time, and volume.

Answer 4

length-meter mass-gram time-second volume-liter

Question 5

All conversion factors, when in the form of a fraction, must equal______.

Answer 5

one

Question 6

2 Students measure the mass of an object that is known to be 50.0g. The 1st student measures the mass to be 49.8123g. The 2nd measures the mass to be 50.1g. Which student was more precise? Which student was more accurate?

Answer 6

1st-precise

2nd-accurate

Question 7

Explain what a significant figure is.

Answer 7

A significant figure is a measured digit that comes from a measuring instrument

Question 8

How many significant figures are in the following numbers?

a. 120350
b. 10.020
c. 0.000000012
d. 7.20 x 10(2)

Answer 8

a. 5
b. 5
c. 2
d. 3

Question 9

A student measures the mass of an object A to be 50.3g and measures the mass of object B to be 200.24g. She then reports the combined mass to be 251g. Is this student correct? Why or why not?

Answer 9

No. Because the value for combined mass has too few significant figures. By the +/- rule we should have rounded to the 10ths place.

Question 10

What would be the units on the following calculations? You do not have to do the math since this question only wants the units.

a. 8 cm + 2 cm =
b. 4g / 2mL =

Answer 10

a. cm

b. g/mL

Question 11

Which will be a derived unit?

a. cm
b. g/mL

Answer 11

b

Question 12

What are the 2 basic rules for using scientific notation?

Answer 12

1) only one digit in front of the decimal point

2) only significant figures go in front of the multiplication sign

Question 13

Which is colder: 50.0g of water at 0.00 *C or 50.0g of water at 32.00 *F

Answer 13

neither they are the same temperature

Question 14

what is the formula to convert *F to *C?

Answer 14

C = 5/9 (F - 32)

Question 15

What is the adding and subtracting with significant figures rule?

Answer 15

When adding and subtracting measurements, round your answer so that it has the same precision as the least precise measurement in the calculation.

Question 16

What is the multiplying and dividing with significant figures rule?

Answer 16

When multiplying and dividing measurements, round the answer so that it has the same number of significant figures as the measurement with the fewest significant figures.

Question 17

What is the formula to convert *C to *F?

Answer 17

F = 9/5 (C) + 32

Question 18

What is the formula to convert *C to K?

Answer 18

K = *C + 273.15

Question 19

What is the formula to convert K to *C?

Answer 19

*C = K - 273.15

Question 20

How many significant figures will the answer of 134.5 x 42 have?

Answer 20

2

Question 21

A chemists wants to add these 3 measurements together: 2.30040 x 10^6 mL and 7,345.6 mL. What can she report as the correct combined volume?

a. 2,307,745 mL
b. 2,307,750 mL
c. 2,307,700 mL
d. None of the above

Answer 21

b.

Question 22

Note:

Answer 22

Be careful about rounding and significant figures (you might want to look at test too)