CHEMISTRY SEMESTER 1 EXAM

The number of significant figures in the measurement 9000 cm is

• A) 1

• B) 2

• C) 3

• D) 4

Which of these measurements has been expressed to three significant figures?

• 0.025 g

• 0.900 g

• 8.012 g

• 200 g

Which of these measurements has been expressed to four significant figures?

• 0.0010 mm

• 0.04020 mm

• 9000 mm

• 510.60 mm

What is 1.582 573 701 x 10⁹ rounded to four significant figures?

• 1582

• 1.582 x 10⁹

• 1.583 x 10⁹

• 1583

The product of 10.00 cm and 3.00 cm is correctly reported as

• 30 cm²

• 30.0 cm²

• 30.00 cm²

• 30.000 cm²

The speed of light is 299 792 458 m / s. In scientific notation, this speed is written to one significant figure as

• 3 x 10⁷ m/s

• 3 x 10⁸ m/s

• 3 x 10⁶ m/s

• 3 x 10⁹ m/s

Tags

NGSS.HS-PS4-3

How would 0.00930 m be expressed in scientific notation?

• 93 x 10^-4 m

• 9.3 x 10^-4 m

• 9.30 x 10^-3 m

• 9.30 x 10^-5 m

Elements that are found in the same group have the same number of

• protons.

• protons and neutrons.

• valence electrons.

• neutrons.

Of the elements shown below, which is a nonmetal?

• Hg

• Pd

• Rn

• W

If an element has an octet of electrons in its highest main energy level, there are ____ electrons in this level.

• 2

• 32

• 10

• 8

Tags

NGSS.HS-PS1-1