Chem 3 Exam 1 Review

It's about the number!

100

How many significant figures are there in 0.02020?

4

200

How many significant figures are there in 100 x 10^-3

1

300

What is 1.25 + 3.10000 + 5

9

400

Convert the following to scientific notation:

0.000125

1.25 x 10^-4

500

What is 

(25.1 - 12.250 ) / 2.526 = 

5.11

Energy

100

Energy associated with motion

kinetic

200

process of absorbing heat from surroundings

endothermic

300

Energy that transfers from one object to another because of a temperature difference between them

heat

400

.238 cal equals how many Joules

1 Joule

500

The signs of q and w of a gas releases heat and has the work done on it

q = negative

w = positive

Measurements

100

a quantitative observation always includes ____

a number and a unit

200

_____ is the reproducibility of a measurement

precision

300

_____ in = ____ cm

1 in = 2.54 cm

400

convert 14 lbs to g

14 lbs x ( 1 lb / 453.6 g) = 0.031 lb

500

Convert 0.2924 km to mm.

a. 2.924 × 10^-3

b. 2.924 × 10⁵

c. 0.000002924

d. 292.4 

e. none of these

b

Matter

100

Matter is everything

True or False? Explain.

false

200

Tap water is ______(element, compound, homogeneous mixture or heterogeneous mixture)

homogeneous mixture

300

This is when a gas changes to liquid

condensation

400

Sugar dissolved in water is a chemical change

True or false?

Explain.

False

500

A measure of how much mass is contained in a given unit volume.

Density