CHEM 1040 10.03.2024

What is the oxidation number of S in H₂SO₄?

• +2

• +6

• -6

• -2

What is the sign of E when work is done by the system and heat is leaving the system?

• +

• -

• Depends on the values of w and q

Tags

NGSS.HS-PS3-4

Calculate the change in internal energy of the system if 200 J of heat is released by the system when the surroundings do 150 J of work on the system.

• 50 J

• -50 J

• 350 J

• -350 J

Tags

NGSS.HS-PS3-1

Which of the following would have a different enthalpy and energy?

• HCl _(aq) + NaOH _(aq) → NaCl _(aq) + H₂O _(l)

• H₂O _(s) → H₂O _(l)

• C _(s) + O_{2 (g)} → CO_{2 (g)}

• 2H_{2 (g)} + O_{2 (g)} → 2H₂O _(l)

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

Choose a weak acid and a strong base from the following:

• HI

• H₃PO₄

• H₂SO₄

• KOH

• NH₃

What is the oxidizing agent in this reaction?

Mg _(s) + CuSO_{4 (aq)} → Cu _(s) + MgSO_{4 (aq)}

• Mg

• CuSO₄

• Cu

• MgSO₄

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Water decomposing to form oxygen gas and hydrogen gas is an example of an ______thermic reaction.

Tags

NGSS.HS-PS1-4

What is the reducing agent in this reaction?

2Al _(s) + 3CuCl_{2 (aq)} → 2AlCl_{3 (aq)} + 3Cu _(s)

• Al

• CuCl₂

• AlCl₃

• Cu

Tags

NGSS.HS-PS1-2

Calculate the change in internal energy of the system when 100 J of heat is absorbed by the system and it does 50 J of work on the surroundings.

• 50 J

• -50 J

• 150 J

• -150 J

Calculate the change in internal energy of the system when 200 J of heat is absorbed by the system and it does 100 J of work on the surroundings.

• 100 J

• -100 J

• 300 J

• -300 J

Tags

NGSS.HS-PS3-1