H Chem I Friday Test - Scientific Measurement

What is the density of an object having a mass of 8.0 g and a volume of 25 cm³?

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• 0.32 g/cm³
• 2.0 g/cm³
• 3.1 g/cm³
• 200 g/cm³

The diameter of a carbon atom is 0.000 000 000 154 m. What is this number expressed in scientific notation?

• 1.54 x 10¹² m
• 1.54 x 10^-12 m
• 1.54 x 10¹⁰ m
• 1.54 x 10^-10 m

Convert: 253 C to K:

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• 526 K
• 625 K
• 0 K
• 186 K

Convert: 0 K to C

• -273 C
• -273 K
• 273 C
• 273 K

What is the mass of 20.0 mL solution if its density is 1.84 g/mL?  

• 10.8 g 
• 21.8 g 
• 10.9 g 
• 36.8 g

The students measured length during a science experiment, they got 12 cm. But the actual measurement was 14.25 cm. What was the percent error?

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• 15.79%

• 18.75%

• 2.25%

• 18%

The deer population is estimated to be 17,600 in northern Illinois, but an actual count was 21,300. What is the percent error?

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• 21%
• 17.37%
• 17.4%
• 21.02%

Three different people weigh a standard mass of 2.00 g on the same balance.  Each person obtains a reading of 7.32 g for the mass of the standard.  These results imply that the balance that was used is ____.

• accurate
• precise
• accurate and precise
• neither accurate nor precise

What is the quantity 0.0075 meters expressed in centimeters?

• 0.075 cm
• 0.75 cm
• 7.5 cm
• 70.5 cm

What is the quantity 7896 millimeters expressed in meters?

• 7.896 m
• 78.96 m
• 789.6 m
• 789,600 m