Chemistry Praxis

Express the following number in scientific notation: 560100

• 5.601 x 10⁵
• 0.5601 x 10⁶
• 5.601 x 10³
• 5601 x 10^-2

When the number 80.6504 is rounded off to 3 significant figures and rewritten, the answer is:

• 80.650
• 80.7
• 81.0
• 80.6

What is the charge on an electron?

• positive
• neutral
• negative
• no charge

How many neutrons in this isotope of argon?

• 40
• 18
• 58
• 22

Tags

NGSS.HS-PS1-8

What is the atomic number of argon?

• 40
• 18
• 58
• 22

Tags

NGSS.HS-PS1-1

Isotopes are atoms of the same element with different __________ because they have different _________.

• #s of protons/#s of electrons
• #s of neutrons/atomic #s
• masses/#s of neutrons
• #s of protons/masses

Tags

NGSS.HS-PS1-8

How many electrons are in an atom of S^2-?

• 16
• 18
• 14
• 6

Tags

NGSS.HS-PS1-1

How many valence electrons would antimony (Sb) have?

• 3
• 5
• 15
• 51

Tags

NGSS.HS-PS1-1

Which of the following is the correct electron configuration notation of germanium?

• 1s²2s²2p⁶3s²3p⁶4s²4p²
• 1s²2s²2p⁶3s²3p⁶4s²4d¹⁰4p²
• 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p¹
• 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p²

Tags

NGSS.HS-PS1-1

Which type of radiation would be striking the fluorescent plate at point Y?

• alpha
• beta
• gamma
• neutrons

Tags

NGSS.HS-PS3-5