Electrochemistry

In a redox reaction, the species that loses electrons

• is called the cathode

• is oxidized

• gains mass at the electrode

• decreases in oxidation number

Tags

NGSS.HS-PS1-2

As an element is oxidized, its oxidation number

• decreases as electrons are lost

• increases as electrons are lost

• decreases as electrons are gained

• increases as electrons are gained

Tags

NGSS.HS-PS1-2

The reaction 2NaCl → 2Na + Cl₂ is an example of

• a reduction reaction, only

• both an oxidation and reduction reaction

• an oxidation reaction, only

• neither an oxidation nor a reduction reaction

Tags

NGSS.HS-PS1-2

Oxidation-reduction reactions occur because of the competition between particles for

• electrons

• positrons

• protons

• neutrons

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Mg + PbCl₂ → MgCl₂ + Pb

Which statement correctly describes the oxidation and reduction that occur?

• Mg is oxidized and Pb⁺² is reduced

• Mg is oxidized and Cl^- is reduced

• Mg is reduced and Cl^- is oxidized

• Mg is reduced and Pb⁺² is oxidized

Tags

NGSS.HS-PS1-2

Pb + 2Ag⁺ → Pb⁺² + 2Ag

The chemical species being reduced is

• Ag

• Pb

• Pb⁺²

• Ag⁺

Tags

NGSS.HS-PS1-2

When water is electrolyzed, gas collected at cathode, is

• sulphur

• oxygen

• hydrogen

• sulphur dioxide

Tags

NGSS.HS-PS1-2

Ions discharged in electrolysis depends on

• relative electrode potential

• concentration of ions

• relative electrode charge

• density of electrolyte

Tags

NGSS.HS-PS1-5

In electrolysis, particles which move towards cathode are called

• anions

• cations

• photons

• positrons

Electrons always flow from

• cathode to anode

• anode to cathode

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5