Unit 1 Quiz 1 Review

Chem - Unit 1 Review

Whats on the Quiz?

1. ​1 question (5 pts). Independent & Dependent Variables

2. 5 questions (20 pts). Scientific Notation

3. Counting Significant Figures 3 questions (9 pts)

4. Sig Figs Calculations 2 questions (10 pts)

5. Rounding Sig Figs 2 questions (6 pts)

6. Units of Measure 5 questions (20 pts)

7. Conversions in metric system 5 questions (20 pts)

8. Dimensional Analysis. 2 questions (10 pts)

Some text here about the topic of discussion

Multiple Choice

The variable the is changed on purpose is..

• Constant

• Control

• Independent Variable

• Dependent Variable

Multiple Choice

The variable that is being tested, counted, or measured and is responding to the independent variable is known as 

• Control
• Constant
• Independent Variable
• Dependent Variable

Multiple Choice

Mrs. Goodwyn wants to see if studying time affects test scores...She gives all 6 classes the same assignment but assigns different study times. What is the independent variable?

• Study time
• Test score
• Same assignment

Multiple Choice

Mrs. Goodwyn wants to see if studying time affects test scores...She gives all 6 classes the same assignment but assigns different study times. What is the constant?

• Study  Times
• Test Scores
• Same Assignment

Multiple Choice

Which brand of paper towel will absorb the most liquid? What is the independent variable?

• Brand of paper towel
• Amount of water absorbed

Multiple Choice

Mythbusters did an experiment to see if driving with windows down or with the AC on gets better gas mileage. They drove the same car twice down a track, going the exact same distance both times- once with the windows down, once with the AC on. Then they measured the amount of gas used by the car each trip.

What is the dependent variable in this experiment?

• the amount of gas used

• Using the AC or having 2 windows down.

• using the exact same car and the exact same driving distance

​Scientific Notation

Multiple Choice

Change from standard form to scientific notation: 12,000,000

• 12.0  x  10⁷

• 0.12  x  10⁷

• 1.2  x  10⁶

• 1.2  x  10⁷

Multiple Choice

Change from standard form to scientific notation:  450,000

• 4.5  x  10⁵

• 45  x  10⁵

• 4.5  x  10⁴

• 4.5  x  10⁶

Multiple Choice

Change from standard form to scientific notation: 0.004078

• 4.078  x  10^-3

• 4.078  x  10³

• 40.78  x  10^-4

• .4078  x  10^-2

Multiple Choice

Try to change the number back to standard form: 3.97  x  10^-2

• 0.000397

• 0.0397

• 0.0000397

• 0.397

All non-zero numbers are significant

EG: 932 has three significant figures

54.2 has three significant figures



Multiple Choice

How many significant figures are there in 3987?

• 4

• 3

Leading Zeroes are never significant

0123 has three significant figures

0.0005 has one significant figure

Multiple Choice

Number of significant figures in 0.0003402 are

• 3

• 4

• 7

• 8

Trailing zeros with decimals are significant

100 has one significant figure

100.20 has five significant figures

32.20000 has seven significant figures

Multiple Select

Choose all numbers that have three significant figures

• 530

• 503

• 53.20

• 0.0520

• 0.5020

​Trailing Zero's when there is no decimal, ARE NOT significant

Fill in the Blank

Identify, how many significant figures does the following number have?

$$32000$$  

Multiple Choice

How many significant figures: 0.012 km

• 1

• 2

• 3

• 4

Multiple Choice

How many significant figures: 450 m

• 3

• 2

• 1

• 0

​When Multiplying / Dividing measurements

​It's all about the number of Significant Figures... and you cant have more than the least

​3.50 m x 3.1 m = ?

​The answer must be rounded to the least number of significant figures.

3.50 has 3 sig fig's

3.1 has 2 sig fig's

​

The answer must be 11 m²​

​When add/subt measurements it's all about the number of decimal places... and you can't have more than the least

​3.25 cm + 2.1 cm = ?

​

The answer must be rounded to 1 decimal place​

​

Answer = 5.4 cm​

Multiple Choice

How many Significant Figures in the number below?
0.456

• 3

• 4

• 2

• 1

Multiple Choice

How many Significant Figures in the number below?
4,500

• 3

• 4

• 2

• 1

Multiple Choice

Solve & Round to Correct Sig Figs.
4.5 + 4.32 = 

• 8.8

• 8.7

• 8

• 8.0

Multiple Choice

Solve & Round to Correct Sig Figs.
4.5 x 2.34 = 

• 11

• 10.52

• 10.5

• 10

Base Units

• Volume = Liters = L

• Mass = Grams = g

• Length = meters = m

The Metric System

Multiple Select

Which units are the BASE units in the metric system? Check all that apply.

• Meters

• Liters

• Grams

• Inches

• Miles

Converting Units

• Changing a Metric Units to another Metric Unit

• Moving BIG unit to small Multiply

• Moving small to BIG Divide

Multiple Choice

42 L = ? mL

• 4,200

• .0042

• 4.20

• 42,000

Multiple Choice

40 mL =  ? cL

• 400

• 4000

• 4

• 0.4

Multiple Choice

3 cm = ? mm

• 30

• 300

• 3000

• 0.3

Multiple Choice

75.2 cm = ? m

• 0.752

• 7.52

• 75.2

• 752

​Dimensional Analysis

Multiple Choice

The length of a desk is 3.5 feet. How many centimeters is the length?

(2.54 cm =1 inch)

• 60

• 120.23

• 106.68

• 117.12

Multiple Choice

Convert 300 feet/hour into inches/second

• 10

• 100

• 1

• 1000

Multiple Choice

The human esophagus us about 250 mm log. How long is that in inches?

• 10.64 in

• 9.84 in

• 11.35 in

• 8.84 in

Multiple Choice

A bicycle has a speed of 6.00 m/s. What is its speed in km/h?

• 21.6 km/h

• 16.67 km/h

• 2.16 km/h

• 1.67 km/h

Multiple Choice

Jackrabbits are capable of reaching speeds up to 40 miles per hour. How fast is this in feet per second? (Round to the nearest whole number.)

5,280 feet = 1 mile

• 95 feet per second

• 59 feet per second

• .45 feet per second

• 40 feet per second

Multiple Choice

How many miles will a person run during a 10.0 kilometer race?

• 6.2 miles

• 6.21 miles

• 1.61 miles

• 1.6 miles

Multiple Choice

The moon is 250,000 miles from earth. How many feet is that?

• 47, 348 ft.

• 47 ft.

• 1.32 X 10⁹ ft.

• 1.3 X 10⁹ ft.

Multiple Choice

How many minutes are in a school year, 187 days?

• 269,280 min.

• 16, 200 min.

• 16, 156 min.

• 269,000 min.

Multiple Choice

Which conversion factor would be needed?

Multiple Choice

Which conversion factor would be needed?