Question 1) When sodium hydroxide (NaOH) is dissolved in water, it ionizes compl

Question

Question 1) When sodium hydroxide (NaOH) is dissolved in water, it ionizes completely (it becomes Na+ and OH- ions). If a solution of NaOH has a molar concentration of 10-1M, then its pH is…

1

6

10

13

-6

0.2 g/ mol.

0.5 g/ mol.

5 g/ mol.

20 g/ mol.

Question 3) All of the following statements are false regarding CH4 EXCEPT:

I. it is a molecule.
II. it is a compound.
III. two moles of it contain eight moles of hydrogen.
IV. when mixed with water, one mole yields 5 ions in solution.

It is a saturated fatty acid.

It is a trans fatty acid.

It is hydrophilic fatty acid.

It is an unsaturated fatty acid

I and III

I and IV

I, II, and III

I, II, III, and IV

C5H2NO2

C5H9NO2

C4H7N2O2

C4H2N2O2

a.

1

b.

6

c.

10

d.

13

e.

-6

Explanation / Answer

Q 1.

Answer: D 13

[H+] [OH-] = 1.00 x 10-14

=>[H+] [10-1] = 1.00 x 10-14

=>[H+] = 1.00 x 10-13

pH = -log10 (H+)

pH= 13

2. Image missing

3.

Answer: II. it is a compound.

All others are false

though it is not a molecule, doesn't ionize in water, 2 moles of CH4 contains 4 moles of hydrogen (H2)

4.

Answer:

I, II, III, and IV

The phospholipid head contains a negatively charged phosphate group and glycerol; it is hydrophilic. And fatty acids are hydrophobic in nature.

The cis and trans structure can be identified by observing the arrangement of H atom bound to C=C bond.

If double or triple bond present then unsaturated, if absent then it is saturated.

5.

Molecular structure not provided.

d.

I, II, III, and IV

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