Thou Shalt Not Forget AP Chem

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

Which of these is false in terms of speeding up reactions?

• Adding a catalyst lowers the activation energy

• increasing reactant concentration increases collisions

• increasing surface area decreases collisions

• increasing temperature increases collisions

Tags

NGSS.HS-PS1-5

Which atom has the negative dipole in this molecule?

• Hydrogen

• Fluorine

• Neither

What is the study of matter and how it changes?

• Biology

• Physics

• Chemistry

• Geology

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-4

NGSS.HS-PS1-5

The Periodic Table of Elements is most related to...

• Chemistry

• Geology

• Astronomy

• Biology

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

In this molecule, Carbon has a formal charge of ____ and Nitrogen has a formal charge of _____.

• 0, 0

• 1, 0

• 0, -1

• -1, 0

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Count the number of sigma and pi bonds in this molecule:

• 13 sigma, 1 pi

• 14 sigma, 2 pi

• 1 sigma, 14 pi

• 2 sigma, 13 pi

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

Tags

NGSS.HS-PS3-1

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