AP Chem Unit 4

Chemical or physical change? 2 H₂O(l) + O₂(g) → 2 H₂O₂(l)

• Chemical

• Physical

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-4

Chemical or physical change? H₂O(l) → H₂O(g)

• Chemical

• Physical

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Which observation suggests a chemical change occurred?

• The mass stays constant

• The solution stays colorless

• A precipitate forms

Tags

NGSS.MS-PS1-2

In order to be considered an oxidation-reduction reaction,

• a precipitate must form

• the oxidation number of two species must change

• the pH must change

In order to be considered an acid-base reaction,

• a precipitate must form

• the oxidation number of two species must change

• one or more protons must be transfered

An acid is defined as a...

• proton donor

• proton acceptor

An base is defined as a...

• proton donor

• proton acceptor

In this example, H⁺ + H₂O -> H₃O⁺ the water acts as a(n)

• acid donating a proton

• acid accepting a proton

• base donating a proton

• base accepting a proton

Given the following: NH₃(aq) + HCl(aq) ⇄ NH₄⁺(aq) + Cl^-(aq)

The Brønsted-Lowry acids in the reaction represented above are

• NH₃(aq) and NH₄⁺(aq)

• HCl(aq) and NH₄⁺(aq)

• HCl(aq) and Cl^-(aq)

• NH₃(aq) and HCl(aq)

Which is the correct net ionic equation for the reaction of AgNO₃ and CaCl₂?

• Ca²⁺(aq) +  2Cl^- (aq) → CaCl(s)
• Ag⁺(aq)  +  Cl^- (aq) → AgCl(s)
• Ag +  Cl  →  AgCl
• Ag⁺  +  Ca²⁺   →Ag₂Ca (s)

Tags

NGSS.HS-PS1-7