IB Chemistry

Which statement is correct for the following reaction?

• ClO₃^- is the oxidizing agent and it undergoes reduction.

• ClO₃^- is the reducing agent and it undergoes oxidation.

• SO₂ is the oxidizing agent and it undergoes oxidation.

• SO₂ is the reducing agent and it undergoes reduction.

Tags

NGSS.HS-PS1-7

What is the correct increasing order of reactivity of the metals X, Y and Z based on the following information?

• Z < X < Y

• Y < X < Z

• Z < Y < X

• X < Z < Y

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which is the oxidizing agent in the following reaction?

• SO₂

• IO₃^-

• H₂O

• SO₄^2-

Tags

NGSS.HS-PS1-2

Consider the following reactions of three unknown metals X, Y and Z. What is the order of increasing reactivity of the metals (least reactive first)?

• X < Y < Z

• X < Z < Y

• Z < Y < X

• Y < Z < X

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which one of the following is not a redox reaction?

• Br₂ +SO₂ +2H₂O → SO₄^2– +4H+ +2Br^–

• SnCl₂ + HgCl₂ → Hg + SnCl₄

• Cu₂O+H₂SO₄ → CuSO₄ +Cu+H₂O

• 2CrO₄^2– + 2H⁺ → Cr₂O₇^2– + H₂O

Molecules or ions that contain an element with an oxidation state of +5 include

• 1, 2 and 3 only correct

• 1 and 3 only correct

  NO₂⁺

• 2 and 4 only correct

• 4 only correct

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What happens to the Cr³⁺ (aq) ion when it is converted to CrO₄²⁻ (aq)?

• Its oxidation number decreases and it undergoes reduction.

• Its oxidation number decreases and it undergoes oxidation.

• Its oxidation number increases and it undergoes reduction.

• Its oxidation number increases and it undergoes oxidation.

The following reactions are spontaneous as written.

Fe(s) + Cd²⁺ (aq) → Fe²⁺ (aq) + Cd(s)
Cd(s) + Sn²⁺ (aq) → Cd²⁺ (aq) + Sn(s)
Sn(s) + Pb²⁺ (aq) → Sn²⁺ (aq) + Pb(s)

Which of the following pairs will react spontaneously?
I. Sn(s) + Fe²⁺ (aq)
II. Cd(s) + Pb²⁺ (aq)
III. Fe(s) + Pb²⁺ (aq)

• I only

• II only

• III only

• II and III only

Oxidation is the _________ of electrons.

• loss

• gain

• sharing

• transfer

Tags

NGSS.HS-PS1-1

Reduction is the ___________ of electrons.

• loss

• gain

• sharing

• transfer

Tags

NGSS.HS-PS1-1