Chemistry Chapter 3

The SI unit that represents the number of particles in a substance is the ________.

• Meter

• Kilogram

• Liter

• Mole

What does 25,500 g equal in kilograms?

• 2550

• 255

• 25.5

• 2.55

You measure the products of a chemical reaction three times and obtain 6.15 g, 6.16 g, and 6.13 g. The actual mass is 6.14 g. Your measurements are _______.

• Accurate but not precise

• Precise but not accurate

• Both accurate and precise

• Neither accurate nor precise

The smaller the percent error of a measurement, the more _____ the measurement.

• Precise

• Accurate

• Significant

• Metric

Which of the following factors affect(s) precision in measurements?

• Mathematical error

• Improper calibration

• Procedural error

• All of the above

Using scientific notation, convert 463 kg to milligrams.

• 4.63 x 10^8 mg

• 4.63 x 10^6 mg

• 4.63 x 10^-8 mg

• 4.63 x 10^-6 mg

The measurement 0.00500610m has how many significant figures?

• 3

• 5

• 6

• 8

How many significant figures are in the measurement 0.017000g?

• 3

• 5

• 6

• 8

If a scientist is extremely careful and uses precise instruments, a perfect measurement can be obtained.

• True

• False

Step 3 of problem solving is to plug in known values and evaluate.

• True

• False