Warm –up: What is the density of the block?

CUBE DESCRIPTION

Material Plastic

Length of each side 2 cm

Mass 24 grams

Weight 6.6 N

Unit 1 Review

Lab Safety

Tools

Measurement

1. What are the steps you should follow if an accident occurs in the lab?

1. Stay Calm

***2. Tell the teacher

3. Follow directions

2. When cleaning up a lab where materials contain bacteria, when should you wash your hands?

• Wash hands with soap and water after everything has been cleaned up.

3. What is the primary reason for cleaning and properly storing lab equipment after you finish a lab?

*So materials do not become contaminated.

4. How will you know the correct way to dispose of a chemical

after a lab?

Pour the chemical into a special waste container as instructed by the teacher.

5. How would you position a test tube over an open flame?

Use a test tube holder to hold the test tube over an open flame.

6. Give an example of how you can conserve materials in a lab?

***Limit the amount of materials used during the investigation.

7. What are some laboratory items that can be safely reused?

• Glassware can be reused by washing it. Examples: graduated cylinders,

beakers, *Petri dishes, flasks

8. Why do we waft chemical vapors instead of just smelling them?

***We “waft” vapors to protect the respiratory track from strong harmful vapors.

1. What is the formula for Density?

• Density is mass/volume

2. Which tools would you need to find density of a cube?

• You will need a balance and ruler.

3. What steps must you follow when measuring liquids with a graduated cylinder?

***Place cylinder on a level surface

***Get down at eye level.

***Measure at the bottom of the meniscus.

• Count out the scale!!!

4. What might a Petri dish be used for?

***growing bacteria samples

Tools Word Bank

A) This tool is used to measure mass.

Triple beam balance

SI Unit

grams

B) The _____________ measures liquid volume.

graduated cylinder

SI Unit

mL

C) Length is measured with a ________.

metric ruler

SI Unit

meter

D) A ___________ is used to measure temperature.

thermometer

SI Unit

Celsius

E) Weight is measured with a _________.

spring scale

SI Unit

Newtons

F) Timing things in a lab is done with a

______________.

stopwatch

SI Unit

seconds

Weight Density Speed

(N) (g/mL) (cm/s)

9. What tools would be used to collect data for the table above? (hint…there should be five tools)

Spring ScaleBalanceGraduated Cylinder

Metric RulerStop Watch

Measurement Tool SI Unit

mass balance X

Y graduated cylinder mL

length metric ruler cm

Weight Z N

g gram

volume

Spring scale

8. According to the data table above, what would belong at points X, Y and Z?

7. What is the difference in the actual width of the two trees?

Scale: 1 cm = 3 m

6. Find the average (mean) height of the two columns?

5. What is the average (mean) length of the three lines?

4. Find the volume of the box.

6 cm

2 cm