Chemistry Midterm Exam

The element hydrogen has three naturally occurring isotopes. Which of the following describes the relationship of these isotopes?

• different mass, different atomic number

• same mass, different atomic number

• different mass, same atomic number

• same mass, same atomic number

The number of which type of particle determines the identity of an element?

• electrons

• neutrons

• protons

• photons

When experimenting with the growth of a plant, a scientist uses three (of the same type of) plants, two different fertilizers, equal light, and equal water. What type of variable is the fertilizer?

• Dependent

• Independent

• Control

• Compound

Tags

NGSS.MS-LS1-5

Which particle has a mass so small, it is considered to be 0 amu?

• proton

• hydrogen nucleus

• neutron

• electron

What quantity is the same among atoms of the same element?

• mass number

• atomic number

• number of neutrons

• number of nucleons

(8 x 10^-23) - (2 x 10^-25)

• 7.98 x 10^-23

• 6 x 10^-23

• 6 x 10^-25

• 7.98 x 10^-25

Multiply (1.23 x 10⁴) x (.52 x 10²)

• 6.396 x 10⁷

• 0.6396 x 10⁷

• 6.396 x 10⁵

• 6.396 x 10⁸

Multiply:
(2 x 10⁵)(3 x 10³)

• 6 x 10²
• 6 x 10⁸
• 5 x 10⁸
• 5 x 10²

Express the following in scientific notation:
.000457

• 457 x 10⁶
• 457 x 10^-6
• 4.57 x10⁴
• 4.57 x 10^-4

How do you write

8.317 x 10⁶

in standard form?

• 8,371,000

• 83,170,000

• 837,100

• 8,317,000