4th Six Weeks CA Review

Week 3

February 2009

Lab Safety & Measurement

1. After completing an experiment, all chemical wastes should be

A. left at your lab station for the next classB. disposed of according to your instructor’s directionsC. dumped in the sink

2. You have been injured in the laboratory (cut, burn, etc.) First you should

A. visit the school nurse after class.B. tell the science instructor at once.C. apply first aid yourself.

3. When diluting sulfuric acidA. add the sulfuric acid to plenty of waterB. add plenty of water to the sulfuric acid

4. Timothy is curious about the odor of a clear unknown liquid in a beaker. To safely make the observation he should-

A. place his face over the beaker and inhale deeply

B. put some on his finger and smell his finger

C. use his hand to fan the substance towards his nose

5. Which piece of lab equipment will be used to accurately measure the volume of a marble?

A DC

B

6. The volume in the graduated cylinder on the right is _____?

A.18 mLB.15.3 mLC.19 mLD.15.6 mL

8. The length of the arrow below is approximately ___________ cm.3

9. The triple beam balance below has a mass reading of _____?

A. 547 g

B. 545 g

C. 545.2 g

D. 455.2 g

500

40

5.2

545.2

10. Complete the diagram below for metric conversions.

K H ____ B ____ C____

g

L

m

D D M

“King Henry Died By Drinking Chocolate Milk”

11. Brittany used a graduated cylinder to measure 67.5 mL of sodium hydroxide for an experiment. What is the volume of sodium hydroxide in liters?

A. 0.675 L

B. 0.0675 L

C. 6.75 L

D. 6750 L

K H D B D C M

6 7 50

12. A student took the mass of a metal block using a triple beam balance. The mass of the metal block was 567g. What is the mass of the block in kilograms?

A. 0.567 kg

B. 5.67 k

C. 56.7 kg

D. 5670 kg

K H D B D C M

5 6 7

13. Complete the table below with the correct SI unit and symbol.

SI Unit Symbol of Unit

Length

Mass

Volume

Temperature

Time

meter

gram

Liter

Kelvin

second

m

g

L

K

s

14. List two reasons why the metric system is so popular: ___________________________________________________________________________________________________________________________

1.It is easy to use because it is based on multiples of 10.

2. It is universally known

Scientific Method

1. The scientific method is a set of investigative procedures that scientist use to __________________________. solve problems

2. Organize the 6 steps of the scientific method in the correct order 1-6.

________ Conclusion

________ State the problem

________ Experiment

________ Gather information

________ Analyze the data

________ Formulate a testable hypothesis

6

1

4

2

5

3

3. Sandy grows roses along her walkway. The roses close to the street had more blooms than the roses close to the house. Which statement is a hypothesis that Sandy could make about her roses?

A. There were many blooms on the roses near the house and fewer blooms on the roses closest to the

street.B. If the roses closest to the street had more blooms than

they received more sunlight.C.The roses near the house were taller but had fewer blooms.D. The roses close to the house had fewer blooms and leaves.

4. Ellen noticed that she often sneezes when she visits her friend Robert, who has a cat and a parrot. Ellen wonders if she may have allergies to Robert’s pets and decides to conduct a scientific investigation. What should Ellen do next?

A. Ellen should tell Robert that she cannot visit him until he gives away his pets.

B. Ellen should visit Sue who has a horse, a dog, a goldfish, and a hamster.

C. Ellen should call her doctor and insist that she needs shots for allergies.

D. Ellen should visit a friend who has only cats and one who has only parrots.

5. The __________________ variable is manipulated or changed and is located on the ______- axis.

6. The __________________ variable is the responding variable and is located on the ______- axis.

independent

x

dependent

y

DR

YMIX

Read the passage below and answer questions 7-9.Bart believes that mice exposed to microwaves will become extra strong. He decides to perform this experiment by placing 10 mice in a microwave for 10 seconds. He compared these 10 mice to another 10 mice that had not been exposed. His test consisted of a heavy block of wood that blocked the mouse food. He found that 8 out of 10 of the microwaved mice were able to push the block away and 7 out of 10 of the non-microwaved mice were able to do the same.

7. The 10 mice that Bart did not expose to the microwave is the –

A. Independent variableB. Dependent variableC. Control

Read the passage below and answer questions 7-9.Bart believes that mice exposed to microwaves will become extra strong. He decides to perform this experiment by placing 10 mice in a microwave for 10 seconds. He compared these 10 mice to another 10 mice that had not been exposed. His test consisted of a heavy block of wood that blocked the mouse food. He found that 8 out of 10 of the microwaved mice were able to push the block away and 7 out of 10 of the non-microwaved mice were able to do the same.

8. The strength of the mice is the –

A. Independent variableB. Dependent variableC. Control

Read the passage below and answer questions 7-9.Bart believes that mice exposed to microwaves will become extra strong. He decides to perform this experiment by placing 10 mice in a microwave for 10 seconds. He compared these 10 mice to another 10 mice that had not been exposed. His test consisted of a heavy block of wood that blocked the mouse food. He found that 8 out of 10 of the microwaved mice were able to push the block away and 7 out of 10 of the non-microwaved mice were able to do the same.

9. Exposure to microwaves is the –

A. Independent variableB. B. Dependent variableC. C. Control

Density

1. Complete the triangle below with the formula for density.

x

m

vd

Density (d) = mass (m)

volume (v)

2. Calculate the density of a metal cube that has a mass of 30 g and a length of 2 cm, a width of 2 cm and a height of 2 cm.

(Hint: Volume= L x W x H)

Known Values Formula Substitution Answer with Units

d =

m =

v =x x2cm x 2 cm x 2 cm= 8cm3

30 g

? m

v d

30g

8cm3 ?3.75 g/cm3

3. If you have a graduated cylinder that was filled to 30 ml and you dropped a rock into it and water in the cylinder raises to 34 ml. What is the volume of the rock? If this same rock has a mass of 44g what would the density of this rock be?

Known Values Formula Substitution Answer with Units

d =

m =

v =x x34mL – 30 mL = 4 mL

44 g

? m

v d

44g

4mL ?11 g/mL

4. What is the density of water? ____ g/mL

5. If an object has a density of 2.0 g/cm3, it will _________ in water.

A. sink B. float

6. If an object has a density of 0.89 g/mL it will ________ in water.

A. sink B. float

1

7. Which liquid in the beaker above is the most dense? ______

8. Which liquid in the beaker above is the least dense? ______

4

1

heavy

heavy

Graphing and Speed

Use the graph to answer questions 1 and 2.

1. In the Distance vs Time graph above, distance is the ___.A. Dependent variableB. Independent variableC. Control

2. In the Distance vs Time graph above, what is the time when the distance is 5 m? ________ s3

x

DR

Y

MIX

3. Observe the 3 graphs below and match them with the correct statement below.

Statement A: The graph shows that the object is decreasing in speed.

Statement B: The graph shows that the object is not in motion

Statement C: The graph shows that the object is increasing speed

Statement Statement Statement

Spe

ed (

m/s

)

Spe

ed (

m/s

)

Dis

tanc

e (m

)

Time (s)

C A B

Attention: Correct the x and y labels on the graph

4. Complete the triangle below with the formula for speed.

x

d

ts

speed (s) = distance (d)

time (t)

5. A car traveled 500 meters in 10 seconds. What speed is the car traveling?

Known Values Formula Substitution Answer with Units

s =

d =

t =x x

d

t s

500m

10s ?10 s

500 m

?

50 m/s

6. A baseball is thrown at a speed of 20 m/s, and travels for 30 seconds. How far did it travel?

Known Values Formula Substitution Answer with Units

s =

d =

t =x x

d

t s30 s

?

20m/s

60 m

?

30s 20m/s

7. A soccer ball is kicked towards the goal 100 m away at a speed of 25 m/s. How long does it take for the ball to roll into the goal?

Known Values Formula Substitution Answer with Units

s =

d =

t =x x

d

t s?

100 m

25 m/s

4 s

100m

? 25m/s

8. Chrystal is flying from Houston to Austin. The plan travels 800 km/h. How many kilometers will the plane cover in 4 hours

Known Values Formula Substitution Answer with Units

s =

d =

t =x x

d

t s

?

4 h 800 km/s

4 h

?

800 km/h

3200 km

9. Jasmine is going to Ashley’s house. The car she is driving travels 200 km, going at a speed of 50 km/h. How long did it take the car to travel 200 km?

Known Values Formula Substitution Answer with Units

s =

d =

t =x x

d

t s

200km

? 50km/h

?

200 km

50 km/h

4 h

10. Tasha is going to Madi’Gra. Her plane travels from Houston to New Orleans in 4 hours. How fast is the plane traveling if the distance between the two cities is 2800 km?

Known Values Formula Substitution Answer with Units

s =

d =

t =x x

d

t s

2800km

4h ?

4h

2800 km

?

700 km/h

Study Study Study !!!!!!!!