Your teacher hands out a copy of a laboratory experiment. What is the first thing you should do to conduct the experiment safely?

• Read every step of the procedure to make sure you understand it 

• Trade materials with another group that you do not want.

• Go to the cabinet and pull out any chemicals you need.

• Begin heating up the experiment immediately to save time.

What is a graduated cylinder used to measure?

• mass

• volume

• temperature

• length

Round this measurement to 2 significant digits: 

0.005388 seconds

• 0.005
• 0.0053
• 0.005388
• 0.0054

How many significant digits are in 90,703,000 units?

• 8
• 7
• 5

• 6

Round the answers to the correct number of significant figures:

7.566 + 10.60 =

• 18.166

• 18.16

• 18.17

• 18

What is 40,000,000 kg written in scientific notation?

• 400 x 10^5 kg
• 40 x 10^6 kg
• 4.0 x 10^-7 kg

• 4.0 x 10^7 kg

How many meters are in 0.95 km?

• 950
• 1.5
• 0.095
• 0.5

Convert the following temperature to Kelvin: 15°C.   

(K = °C + 273)

• 288 K

• 200 K
• 250 K
• 258 K

Working in the laboratory, a student finds the density of a piece of pure aluminum to be 2.769 g/cm3. The accepted value for the density of aluminum is 2.988 g/cm3. What is the student's percent error?

• 7.3%

• 3.2%
• 6.8%
• 12.5%

Determine the number of protons and electrons for ¹⁹₉F

• Protons: 9, Electrons: 19
• Protons: 9, Electrons: 9
• Protons: 19, Electrons: 9
• Protons: 19, Electrons: 19