AP Chemistry

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

If the pressure of a system is increased, which direction will equilibrium shift?

• toward the side with less moles of gas

• toward the side with more moles of gas

• it will not shift

Which atom has the negative dipole in this molecule?

• Hydrogen

• Fluorine

• Neither

Combustion reactions produce what two substances?

• Water Vapor and Carbon Dioxide

• Carbon Dioxide and Oxygen

• Oxygen and Water Vapor

Choose the correct shape for this molecule:

• Trigonal planar

• Trigonal pyramidal

• Tetrahedral

• Linear

What order is this graph?

• Zero

• First

• Second

• Third

Tags

NGSS.HS-PS1-5

Which step of a reaction mechanism determines the rate?

• the slow step

• the fast step

• the first step

• the second step

Tags

NGSS.HS-PS1-5

What order is the half life of Carbon¹⁴?

• Zero

• First

• Second

Tags

NGSS.HS-PS1-8

How does a catalyst speed up a reaction?

• Adding more reactant

• Providing a pathway that has a lower activation energy

• Increasing the activation energy

• Increasing binding energy