Show:
Volume & Density
Scientific Notation
Accuracy & Precision
Significant Figures
Dimensional Analysis
100

What is the formula for calculating density?

Density = mass/volume

100

Convert the number 234,000 into scientific notation.

2.34×105

100

Define accuracy in a scientific context

Accuracy is the degree to which a measured value agrees with the true value.

100

Count the significant figures in the number 500.

The number 500 has 1 significant figure

100

Convert 250 cm to mm.

2500 mm

200

A student calculates the density of platinum to be 20.48 g/cm³. The Merck Index reports 21.45 g/cm³. What is the percent error of the student’s calculation?

4.49%

200

Convert the number 0.00045 into scientific notation

4.5×10−4

200

Define precision in a scientific context

Precision is the degree to which repeated measurements under unchanged conditions show the same results.

200

Count the significant figures in the number 150.

The number 150 has 2 significant figures

200

Convert 82,650 J to kJ

82.65 kJ

300

Is this student’s density calculation considered accurate? Explain your answer.

No, the calculation is not accurate based on standard scientific conventions, as the density is significantly different from the known value.

300

Convert the number 58,200,000,000 into scientific notation.

5.82×1010

300

Describe the difference between accuracy and precision

Accuracy refers to how close a measurement is to the true value, while precision refers to how consistent measurements are to each other.

300
  • Calculate the sum of 34.5 and 6.248, rounding to the correct number of significant figures.

40.7 (3 significant figures

300

Convert 250 mL to L

0.250 L

400

Determine the volume in a graduated cylinder if it shows 50 mL

The volume in the graduated cylinder is 50 mL

400
  • Convert the number 5.2 x 10⁻⁴ into standard notation.

0.00052

400
  • Provide an example of a measurement that is precise but not accurate.

An example of a measurement that is precise but not accurate could be multiple measurements of 10.0 g when the true value is actually 12.0 g.

400

Calculate the product of 4.2 and 9.856, rounding to the correct number of significant figures

41.5 (3 significant figures)

400

Convert 384 mg to g

0.384 g

500

If you have a substance with a mass of 100 g and a volume of 25 mL, what is the density?

4 g/ml

500

Convert the number 7.8 x 10⁶ into standard notation.

7,800,000

500

Provide an example of a measurement that is accurate but not precise

An example of a measurement that is accurate but not precise could be measurements of 10.0 g, 10.1 g, and 9.9 g when the true value is 10.0 g

500

Calculate the difference of 93.8 and 2.1000, rounding to the correct number of significant figures.

91.7 (3 significant figures)

500

Convert 0.05 g to mg

50 mg