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

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Warm –up: What is the density of the block?
CUBE DESCRIPTION Material Plastic Length of each side cm Mass grams Weight N

Lab Safety Tools Measurement
Unit 1 Review Lab Safety Tools Measurement

What are the steps you should follow if an accident occurs in the lab?
Stay Calm ***2. Tell the teacher 3. Follow directions

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.

*So materials do not become contaminated.
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.

***Place cylinder on a level surface ***Get down at eye level.
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 This tool is used to measure mass. Triple beam balance
SI Unit grams

The _____________ measures liquid volume.
graduated cylinder SI Unit mL

Length is measured with a ________.
metric ruler SI Unit meter

A ___________ is used to measure temperature.
thermometer SI Unit Celsius

Weight is measured with a _________.
spring scale SI Unit Newtons

Timing things in a lab is done with a
______________. stopwatch SI Unit seconds

Spring Scale Metric Ruler Balance Stop Watch Graduated Cylinder
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 Scale Metric Ruler Balance Stop Watch Graduated Cylinder

Measurement Tool SI Unit mass balance X Y graduated cylinder mL
8. According to the data table above, what would belong at points X, Y and Z? Measurement Tool SI Unit mass balance X Y graduated cylinder mL length metric ruler cm Weight Z N g gram volume Spring scale

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.
2 cm 6 cm

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