PLEASE HELP! I WILL GIVE BRAINLIEST Which of the following is an unusual property of water?
Question 1 options:

A)

Its atoms are bound by ionic bonds.

B)

Its charge is balanced evenly around the atom.

C)

It doesn't exist in the gaseous state on Earth.

D)

It's a polar molecule.
Question 2 (5 points)
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Which of the following is a consequence of ocean acidification?
Question 2 options:

A)

Marine organisms that use carbonate (CO32–) as a building block to make calcified shelters are threatened.

B)

Carbonate (CO32–) accumulates to increase the pH of the water.

C)

Shorebird eggs are weakened and break more easily.

D)

Swimmers may experience skin irritation from the acidified water.
Question 3 (5 points)
Given sulfur has an electron configuration of 1s22s22p63s23p4, what oxidation numbers would you expect for sulfur? (Hint: Think about how to achieve a full outer shell.)
Question 3 options:

A)

+4, +6, –2

B)

+2, –4,–6

C)

+4,–4

D)

–2,–4
Question 4 (5 points)
An electrolysis reaction is
Question 4 options:

A)

hydrophobic.

B)

spontaneous.

C)

exothermic.

D)

non-spontaneous.
Question 5 (5 points)
Zinc is used as a coating for steel to protect the steel from environmental corrosion. If a piece of steel is submerged in an electrolysis bath for 24 minutes with a current of 6.5 Amps, how many grams of zinc will be plated out? The molecular weight of Zn is 65.38, and Zn+2 + 2e– → Zn.
Question 5 options:

A)

12.68 g of Zn

B)

3.17 g of Zn

C)

6.34 g of Zn

D)

1.09 g of Zn
Question 6 (5 points)
Which of the following substances will form a base when dissolved in water?
Question 6 options:

A)

HCl

B)

HBr

C)

KOH

D)

SO2
Question 7 (5 points)
Why does an "acid spill kit" often contain baking soda?
Question 7 options:

A)

Baking soda will absorb the acid so that it can be swept up.

B)

Baking soda is a strong base that will react violently with the acid.

C)

Baking soda is a weak base and will neutralize the acid.

D)

Baking soda is a weaker acid, which will raise the solution's pH.
Question 8 (5 points)
Larissa needs to make 500ml of 2.00 M NaCl. The molecular weight of NaCl is 58.44. How does she make 500ml of 2.00 M NaCl?
Question 8 options:

A)

Measure 29.22g NaCl and dissolve it into 500ml water.

B)

Measure 58.44g NaCl and dissolve it into 500ml of water.

C)

Measure 58.44g NaCl, dissolve it into 400ml water, and then top off to 500ml in a volumetric flask.

D)

Measure 29.22g NaCl, dissolve it into 400ml water, and then top off to 500ml in a volumetric flask.
Question 9 (5 points)
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For the reaction shown, which species is undergoing oxidation?
Question 9 options:

A)

Fe(s)

B)

2Ag

C)

Ag+1(aq)

D)

Fe+2(aq)
Question 10 (5 points)
The most common use of the ammonia manufactured is in
Question 10 options:

A)

fertilizers for crops.

B)

dyes.

C)

household cleaners.

D)

plastics manufacturing.
Question 11 (5 points)
Which of the following goes through the largest volumetric change?
Question 11 options:

A)

Water when it's heated from 1oC to 99oC

B)

Water when it freezes into ice

C)

Ice when it melts into water

D)

Water when it boils into steam
Question 12 (5 points)
The zinc case in the dry cell battery serves as the
Question 12 options:

A)

cathode.

B)

separator.

C)

anode.

D)

electrolyte.
Question 13 (5 points)
Current is described as
Question 13 options:

A)

the flow of electrons through a substance.

B)

electricity.

C)

moles of electrons.

D)

the flow of ions through a substance.
Question 14 (5 points)
Using a table for standard reduction potentials, calculate the minimum voltage needed to electrolyze potassium chloride into its elements (K(s) and Cl2(g)).
Question 14 options:

A)

–4.29 V

B)

4.29 V

C)

–1.57 V

D)

1.57 V
Question 15 (5 points)
During a titration, 40.0 ml of 0.25M NaOH were required to neutralize 50.0ml of HCl. What's the concentration of the HCl solution?
Question 15 options:

A)

0.10M

B)

0.20M

C)

0.25M

D)

0.40M
Question 16 (5 points)
A Brønsted-Lowry acid
Question 16 options:

A)

is any species that accepts a proton.

B)

is any species that donates a proton.

C)

is limited to aqueous solutions.

D)

has a lower pH than vinegar.
Question 17 (5 points)
A traditional battery used to start a gasoline-powered automobile is made from
Question 17 options:

A)

lithium-ions.

B)

lead and dilute sulfuric acid.

C)

copper and zinc.

D)

nickel and cadmium.
Question 18 (5 points)
What's the acid ionization constant for an acid with a pH of 2.11 and an equilibrium concentration of 0.30 M?
Question 18 options:

A)

2.01×10–4

B)

4.87×10–8

C)

3.32×10–4

D)

1.99×10–6
Question 19 (5 points)
How many moles of a solute is present in 4.00 L of an 8.30 M solution?
Question 19 options:

A)

8.3 mol

B)

It depends on whether the solute is ionic or covalent.

C)

33.2 mol

D)

It depends on the volume of water.
Question 20 (5 points)
How many hours would it take to reduce one mole of Al+3 to aluminum using a current of 22.2 Amps?
Question 20 options:

A)

13020 hours

B)

3.6 hours

C)

0.22 hours

D)

217 hours