Chem Unit 2- Math Foundations in Chemistry

How many significant figures does the following number have: 2001800

• 3

• 4

• 5

• 7

Round 0.010229 to four sig figs

• 1022
• 1023
• 0.01023
• 0.01022

Round 1047.78 to three sig figs

• 104
• 105
• 1050
• 1050.00

What is the measurement 1042 Liters rounded to 2 significant figures?

• 1040 L

• 1.1 x 10³ L

• 1.0 x 10³ L

• 1000 L

Solve & Round to Correct Sig Figs.

1145.678 + 4.56 + 623.9789 + 78.1 = ?

• 1852.3

• 2000

• 1952.3

• 1853.5

Calculate 12.47 m ÷ 3.2 s and give your answer with the correct number of significant figures.

• 4 m/s
• 3.9 m/s
• 3.90 m/s
• 3.897 m/s

An irregularly-shaped sample of aluminum (Al) is put on a balance and found to have a mass of 43.76 g. The student decides to use the water-displacement method to find the volume. The initial volume reading is 25.5 mL and, after the Al sample is added, the water level has risen to 41.7 mL. Find the density of the Al sample in g/cm³. (Remember: 1 mL = 1 cm³.)

• 2.7 g/cm³

• 1.05 g/cm³

• 0.65 g/cm³

• 2.70 g/cm³

A set of data are all close to each other, and they are close to the actual value.  This set of data can be described as...

• accurate
• precise
• both precise and accurate

Convert this number to standard notation: 7.1 x 10⁴

Convert this number into scientific notation: 0.068

• 6.9 x 10⁶

• 6.8 x 10^-9

• 6.8 x 10^-2

• None of the above