A) Which statement best explains why magnesium and chlorine combine in

Question

a 1:2 ratio? (1 point)
Magnesium has one electron shell and chlorine has two electron shells
Magnesium has two valence electrons, and chlorine can accept one
electron in its valence shell
Chlorine's atomic number is twice magnesium's atomic number
Chlorine can accept twice as many electrons as magnesium in its outer
shell
A) Hydrogen and nitrogen combine to form ammonia. When nitrogen and
hydrogen bond, nitrogen pulls the electrons from hydrogen toward itself.
Which statement about the reactants is correct? (1 point)
Hydrogen is oxidized, nitrogen is reduced
Hydrogen gains electrons, nitrogen is reduced
Hydrogen is oxidized, nitrogen loses electrons
Hydrogen is reduced, nitrogen is oxidized
11/28/24, 6:06 AM Vega Viewer SPA

Question 3
Question 4
A)
Use the reaction to answer the question.
C3H8 + 5O2 → 3CO2 + 4H2O + energy
Which type of reaction is shown?
(1 point)
combination/synthesis
displacement
decomposition
combustion
A) Which phrase best describes a redox reaction? (1 point)
a reaction in which electrons are released from the system
a reaction in which electrons are transferred between different atoms
a reaction in which the number of oxygen atoms is reduced
a reaction in which oxygen combines with different atoms
11/28/24, 6:06 AM Vega Viewer SPA

Question 5
Question 6
A) Which statement describes the process of oxidation? (1 point)
Oxidation results in a gain of electrons, so the oxidation number decreases
Oxidation results in a gain of electrons, so the oxidation number increases
Oxidation results in a loss of electrons, so the oxidation number increases
Oxidation results in a loss of electrons, so the oxidation number decreases
A) Which statement correctly describes the oxidation number of the
manganese atom (Mn) in MnI2 and in MnO2? (1 point)
Manganese has an oxidation number of +2 in both MnI2 and MnO2
Manganese has an oxidation number of +4 in MnI2 and +2 in MnO2
Manganese has an oxidation number of +2 in MnI
2
and +4 in MnO2
Manganese has an oxidation number of +4 in both MnI2 and MnO2
11/28/24, 6:06 AM Vega Viewer SPA

Question 7
A)
Use the chemical equation to answer the question.
Br2
(l) + 2NaI (aq) → I2
(s) + 2NaBr (aq)
Which elements are oxidized and reduced in the equation?
(1 point)
Bromine is oxidized, sodium is reduced
Bromine is oxidized, iodine is reduced
Iodine is oxidized, bromine is reduced
Sodium is oxidized, bromine is reduced
11/28/24, 6:06 AM Vega Viewer SPA

Question 8
A)
Use the redox reactions to answer the question.
Zn + 2H
+ → Zn
2 + + H2
2Al + 3Cu
2 + → 2Al
3 + + 3Cu
Which elements are oxidized?
(1 point)
Zn and Al
Zn and Cu
H and Al
H and Cu
11/28/24, 6:06 AM Vega Viewer SPA

Question 9
True False
Neither hydrogen nor iodine changes oxidation states, so
the reaction is not a redox reaction
Iodine is reduced
Hydrogen always has the same oxidation number, so it
has an oxidation number of +1 in both the reactant H2
and the product HI
Iodine gains electrons from hydrogen
A)
Use the chemical equation to complete the activity.
H2
(g) + I2
(g) → 2HI (g)
(1 point)
11/28/24, 6:06 AM Vega Viewer SPA

Question 10
A) Which chemical equation represents a redox reaction? (1 point)
TiCl4
(s) + 2H2O (g) → TiO2
(s) + 4HCl (g)
CaCO3
(s) → CaO (s) + CO2
(g)
CaO (s) + SiO2
(s) → CaSiO3
(l)
Fe2O3
(s) + 2Al (s) → Al2O3
(s) + 2Fe (l)

Answer 1

Here are the answers to the questions:

Question 1

Which statement best explains why magnesium and chlorine combine in a 1:2 ratio?

• Answer: Magnesium has two valence electrons, and chlorine can accept one electron in its valence shell.

Question 2

Which statement about the reactants is correct?

• Answer: Hydrogen is oxidized, nitrogen is reduced.

Question 3

Which type of reaction is shown?

• Answer: combustion.

Question 4

Which phrase best describes a redox reaction?

• Answer: a reaction in which electrons are transferred between different atoms.

Question 5

Which statement describes the process of oxidation?

• Answer: Oxidation results in a loss of electrons, so the oxidation number increases.

Question 6

Which statement correctly describes the oxidation number of the manganese atom (Mn) in MnI2 and in MnO2?

• Answer: Manganese has an oxidation number of +2 in MnI2 and +4 in MnO2.

Question 7

Which elements are oxidized and reduced in the equation?

• Answer: Bromine is oxidized, iodine is reduced.

Question 8

Which elements are oxidized?

• Answer: Zn and Al.

Question 9

True False

• Neither hydrogen nor iodine changes oxidation states, so the reaction is not a redox reaction: True
• Iodine is reduced: True
• Hydrogen always has the same oxidation number, so it has an oxidation number of +1 in both the reactant H2 and the product HI: True
• Iodine gains electrons from hydrogen: True

Question 10

Which chemical equation represents a redox reaction?

• Answer: Fe2O3(s) + 2Al(s) → Al2O3(s) + 2Fe(l).