Chemistry Exam 1

4

Which of the following are considered safe in the lab? (Mark all that apply)

1. (SCSh2) Melody has long hair and decides not to tie it back during an experiment.

2. (SCSh2) Tyrone is wearing closed toed shoes while in the lab.

3. (SCSh2) Jade informs the teacher of a chemical spill.

4. (SCSh2) Ida walks away from her lab station before the experiment has ended.

5. (SCSh2) Parker is eating a snack while handling chemicals in the lab.

4

What piece of lab equipment is pictured?

Graduated Cylinder

Beaker

Erlenmeyer Flask

Test tube

4

The table shows repeated measurements by laboratory partners of the volume of oxygen released by a plant. Using a more advanced technique, their teacher measured the true volume of oxygen released by the plant as 0.311 mL. Which statement BEST describes the data?

They are both precise and accurate

They are neither precise nor accurate

They are precise by not accurate

They are accurate but not precise

4

Which of the following are physical properties? (Mark all that apply)

Water boils at 100 degrees Celsius.

Diamonds are capable of cutting glass.

Pepper is insoluble in water

Vinegar and baking soda produce bubbles and heat when mixed together

Yeast acts on sugar to form carbon dioxide and ethanol

4

Sugar dissolves in warm water

Physical change

Chemical change

4

A nail rusts

Physical change

Chemical change

4

Physical change

Chemical change

4

Students measured and recorded the density of 4 samples. Using the density column and data table shown above, which of the samples will most likely sink below the corn syrup?

Sample A

Sample B

Sample C

Sample D

4

A marble has a mass of 10 g and a volume of 20 mL. What is the density of the marble?

200 g/mL

2 g/mL

0.5 g/mL

2000 g/mL

4

The ring in the image has a mass of 12 g. What is the density of the ring? (You have to measure the volume in the graduated cylinder before calculating the density)

30 g/mL

3 g /mL

0.033 g/mL

0.33 g/mL

4

The density of aluminum is 2.7 g/mL. A researcher finds a sample of aluminum with a volume of 20. mL. What mass of aluminum did he find?

0.135 g

54 g

7.4 g

22.7 g

4

Which of the following is NOT an element?

H₂

CO₂

O₂

Mg

4

Which of the following correctly describes Iron (II) Oxide (FeO)?

Atom

Element

Mixture

Compound

4

One difference between a mixture and a compound is that

A compound is made up of more than one phase.

A compound can only be separated into its components by chemical means.

A mixture can only be separated into its components by chemical means.

a. A mixture must be uniform in composition.

4

Which of the following is an example of a mixture?

NaCl

Saltwater

H₂O

Gold

4

Which of the following mixtures are homogeneous? (Mark all that apply)

Gatorade (Sports drink)

Chex mix

Ice cream sundae (including all ingredients)

The air in the classroom

4

To two significant figures, the measurement “0.0258 g” should be reported as

0.02 g

0.026 g

0.025 g

2.5 x 10² g

4

Which measurement has been expressed to three significant figures?

0.0020 mm

30.00 mm

0.00402 mm

402.10 mm

4

What is the measurement “0.000065 cm” written in scientific notation?

65 x 10^-4

6.5 x 10^-6

6.5 x 10^-5

6.5 x 10^-4

4

The measurement “2.0 x 10^-2 L” is the same as which of the following?

200 L

0.020 L

2.0 L

0.20 L

2

Perform the indicated operations. Be sure to include the correct number of significant figures and units in your answer.
45.68 g + 3.2 g = _____________________

2

Perform the indicated operations. Be sure to include the correct number of significant figures and units in your answer.
(1.142 x 10^-8 mm) x (8.5 x 10^-4 mm) _____________________

2

Metric Conversions:
1000 mg = _______________ g

2

Metric Conversions:
60 cm = _______________ mm

2

Temperature Conversions:
Convert 154 K to °C ______________________

2

Temperature Conversions:
Convert -25 °C to K ______________________

8

Supporting Claims: Answer the question using the CER method. Be sure to clearly state your claim and justify your answer with evidence and reasoning. Please include a particle diagram(s) in your answer. (8 pts)
Question: Is burning a candle an example of a chemical change, physical change, or is it both?

Chemistry Exam 1

Which of the following are considered safe in the lab? (Mark all that apply)

What piece of lab equipment is pictured?

The table shows repeated measurements by laboratory partners of the volume of oxygen released by a plant. Using a more advanced technique, their teacher measured the true volume of oxygen released by the plant as 0.311 mL. Which statement BEST describes the data?

Which of the following are physical properties? (Mark all that apply)

Sugar dissolves in warm water

A nail rusts

Students measured and recorded the density of 4 samples. Using the density column and data table shown above, which of the samples will most likely sink below the corn syrup?

A marble has a mass of 10 g and a volume of 20 mL. What is the density of the marble?

The ring in the image has a mass of 12 g. What is the density of the ring? (You have to measure the volume in the graduated cylinder before calculating the density)

The density of aluminum is 2.7 g/mL. A researcher finds a sample of aluminum with a volume of 20. mL. What mass of aluminum did he find?

Which of the following is NOT an element?

Which of the following correctly describes Iron (II) Oxide (FeO)?

One difference between a mixture and a compound is that

Which of the following is an example of a mixture?

Which of the following mixtures are homogeneous? (Mark all that apply)

To two significant figures, the measurement “0.0258 g” should be reported as

Which measurement has been expressed to three significant figures?

What is the measurement “0.000065 cm” written in scientific notation?

The measurement “2.0 x 10-2 L” is the same as which of the following?

Perform the indicated operations. Be sure to include the correct number of significant figures and units in your answer.45.68 g + 3.2 g = _____________________

Perform the indicated operations. Be sure to include the correct number of significant figures and units in your answer.(1.142 x 10-8 mm) x (8.5 x 10-4 mm) _____________________

Metric Conversions:1000 mg = _______________ g

Metric Conversions:60 cm = _______________ mm

Temperature Conversions:Convert 154 K to °C ______________________

Temperature Conversions:Convert -25 °C to K ______________________

Which of the following are considered safe in the lab? (Mark all that apply)

What piece of lab equipment is pictured?

The table shows repeated measurements by laboratory partners of the volume of oxygen released by a plant. Using a more advanced technique, their teacher measured the true volume of oxygen released by the plant as 0.311 mL. Which statement BEST describes the data?

Which of the following are physical properties? (Mark all that apply)

Sugar dissolves in warm water

A nail rusts

Students measured and recorded the density of 4 samples. Using the density column and data table shown above, which of the samples will most likely sink below the corn syrup?

A marble has a mass of 10 g and a volume of 20 mL. What is the density of the marble?

The ring in the image has a mass of 12 g. What is the density of the ring? (You have to measure the volume in the graduated cylinder before calculating the density)

The density of aluminum is 2.7 g/mL. A researcher finds a sample of aluminum with a volume of 20. mL. What mass of aluminum did he find?

Which of the following is NOT an element?

Which of the following correctly describes Iron (II) Oxide (FeO)?

One difference between a mixture and a compound is that

Which of the following is an example of a mixture?

Which of the following mixtures are homogeneous? (Mark all that apply)

To two significant figures, the measurement “0.0258 g” should be reported as

Which measurement has been expressed to three significant figures?

What is the measurement “0.000065 cm” written in scientific notation?

The measurement “2.0 x 10-2 L” is the same as which of the following?

Perform the indicated operations. Be sure to include the correct number of significant figures and units in your answer.45.68 g + 3.2 g = _____________________

Perform the indicated operations. Be sure to include the correct number of significant figures and units in your answer.(1.142 x 10-8 mm) x (8.5 x 10-4 mm) _____________________

Metric Conversions:1000 mg = _______________ g

Metric Conversions:60 cm = _______________ mm

Temperature Conversions:Convert 154 K to °C ______________________

Temperature Conversions:Convert -25 °C to K ______________________

The measurement “2.0 x 10^-2 L” is the same as which of the following?

Perform the indicated operations. Be sure to include the correct number of significant figures and units in your answer.
45.68 g + 3.2 g = _____________________

Perform the indicated operations. Be sure to include the correct number of significant figures and units in your answer.
(1.142 x 10^-8 mm) x (8.5 x 10^-4 mm) _____________________

Metric Conversions:
1000 mg = _______________ g

Metric Conversions:
60 cm = _______________ mm

Temperature Conversions:
Convert 154 K to °C ______________________

Temperature Conversions:
Convert -25 °C to K ______________________

The measurement “2.0 x 10^-2 L” is the same as which of the following?

Perform the indicated operations. Be sure to include the correct number of significant figures and units in your answer.
45.68 g + 3.2 g = _____________________

Perform the indicated operations. Be sure to include the correct number of significant figures and units in your answer.
(1.142 x 10^-8 mm) x (8.5 x 10^-4 mm) _____________________

Metric Conversions:
1000 mg = _______________ g

Metric Conversions:
60 cm = _______________ mm

Temperature Conversions:
Convert 154 K to °C ______________________

Temperature Conversions:
Convert -25 °C to K ______________________