Real gases behave most like an ideal gas at high temperature and at low pressure. The more polar a gas is and the larger a gas is, the more it will deviate from ideal behavior. Consequently, small, nonpolar gases are the _______ ideal.

• Most

• Least

When an electron is in a higher energy level, it is farther away from the nucleus and has less Coulombic attraction to the nucleus and is therefore easier to remove

• True

• False

Tags

NGSS.HS-PS2-4

Cations (+) are smaller than their atoms since you are removing valence electrons that are farther from the nucleus and anions (−) are larger than their atoms since adding extra electrons increases electron-electron repulsions.

• True

• False

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-3

The greater the electronegativity difference between 2 atoms, the more polar the bond becomes.

• True

• False

What is the study of matter and how it changes?

• Biology

• Physics

• Chemistry

• Geology

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-3

NGSS.HS-PS1-4

NGSS.HS-PS1-5

Molar Mass = dRT/P

• True

• False

ΔH; feels hot; heat is a product; temperature goes up

• Exothermic

• Endothermic

Tags

NGSS.HS-PS1-4

Breaking bonds is endothermic. Forming bonds is exothermic.

• True

• False

Tags

NGSS.HS-PS1-4

When calculating ΔH from chemical equations with known enthalpies, if you double reaction coefficients, what happens to the overall ΔH value?

• it doubles

• it is squared

• the sign changes

• nothing

When calculating ΔH from chemical equations with known enthalpies, if you reverse the reaction, what happens to the overall ΔH value?

• the sign for ΔH changes

• it doubles

• it is squared

• nothing