AP Chemistry Semester

What is the average atomic mass of an element with two isotopes: one with a mass of 10 amu and an abundance of 20%, and another with a mass of 11 amu and an abundance of 80%?

• 10.2 amu

• 10.8 amu

• 11.0 amu

• 10.5 amu

How many moles are in 18 grams of water?

• 0.5 moles

• 1 mole

• 1.5 moles

• 2 moles

In the reaction 2H2+O2→2H2O, how many moles of H2O are produced from 4 moles of H2?

• 2 moles

• 4 moles

• 6 moles

• 8 moles

Tags

NGSS.HS-PS1-7

What is the electron configuration of a neutral chlorine atom?

• 1s22s22p63s23p5

• 1s22s22p63s23p6

• 1s22s22p63s23p4

• 1s22s22p63s23p3

Tags

NGSS.HS-PS1-1

Which of the following intermolecular forces is the strongest?

• London dispersion forces

• Dipole-dipole interactions

• Hydrogen bonding

• Van der Waals forces

According to Boyle's Law, what happens to the volume of a gas if the pressure is doubled while the temperature remains constant?

• The volume doubles

• The volume halves

• The volume remains the same

• The volume quadruples

What is the precipitate formed when solutions of silver nitrate (AgNO3) and sodium chloride (NaCl) are mixed?

• AgCl

• NaNO3

• AgNO3

• NaCl

In a titration, what is the purpose of the indicator?

• To neutralize the solution

• To change the color at the endpoint

• To increase the reaction rate

• To decrease the solution's pH

Which factor does not affect the rate of a chemical reaction?

• Temperature

• Concentration of reactants

• Surface area of reactants

• Color of reactants

Tags

NGSS.HS-PS1-5

In an oxidation-reduction reaction, what happens to the substance that is oxidized?

• It gains electrons

• It loses electrons

• It gains protons

• It loses protons