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 = _____________________
Question 22
22.
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) _____________________
Question 23
23.
Metric Conversions:
1000 mg = _______________ g
Question 24
24.
Metric Conversions:
60 cm = _______________ mm
Question 25
25.
Temperature Conversions:
Convert 154 K to °C ______________________
Question 26
26.
Temperature Conversions:
Convert -25 °C to K ______________________
Question 27
27.
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?
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.
What piece of lab equipment is pictured?
Graduated Cylinder
Beaker
Erlenmeyer Flask
Test tube
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
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
Sugar dissolves in warm water
Physical change
Chemical change
A nail rusts
Physical change
Chemical change
Physical change
Chemical change
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
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
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
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
Which of the following is NOT an element?
H2
CO2
O2
Mg
Which of the following correctly describes Iron (II) Oxide (FeO)?
Atom
Element
Mixture
Compound
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.
Which of the following is an example of a mixture?
NaCl
Saltwater
H2O
Gold
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
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
Which measurement has been expressed to three significant figures?
0.0020 mm
30.00 mm
0.00402 mm
402.10 mm
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
The measurement “2.0 x 10-2 L” is the same as which of the following?