Question

1- During this type of reaction atoms give up or take on an electron(s) to achieve a stable valence electron shell.
Group of answer choices

ionic bonding

covalent bonding

isotopic bonding

hydrogen bonding

2- During this type of bonding atoms can share one, two or three pairs of electrons.
Group of answer choices

ionic bonding

isotopic bonding

covalent bonding

hydrogen bonding
3- The chemical reactivity of an element depends on the number of ________________.
Group of answer choices

protons

neutrons

electrons
4- When the electrons of bonded atoms are not being shared equally this is referred to as a
Group of answer choices

non-polar covalent bond

ionic bond

polar covalent bond

5- Which one of the following is not a property of water?
Group of answer choices

Water dissolves substances, especially polar ones.

Water is adhesive.

It only takes a small amount of heat to vaporize water.

Water can absorb heat without a great change in temperature

6- A substance that add protons (H+) to a solution.
Group of answer choices

acid

buffer

base

7- A substance that is pH 5 is how many times more acidic than a substance that is pH 8?
Group of answer choices

3 times

10 times

1000 times

100 times

8- A common lipid for energy storage is a
Group of answer choices

glycogen

steroid

triglyceride

cellulose

9- A polysaccharide found in plants.
Group of answer choices

sucrose

starch

glycogen

glucose

10- A storage molecule for glucose found only in animals.
Group of answer choices

starch

cellulose

glycogen

glucose

Answer 1

1: Ionic bond

Ionic bond also known as the electrovalent bond is formed by the transfer of electrons from the valence shell of an atom into the valence shell of another atom. Ionic bond is formed due to the electrostatic attraction between the two oppositely charged ions.

2: Covalent bond

Covalent bond is formed by the sharing of valence shell electrons between the two atoms.

3. Electrons

The chemical reactivity of an element is depend on the number of electrons in the outermost shell.

4. Polar covalent bond

When electrons of two bonded atoms are not shared equally it is known as the polar covalent bond.

5. It only takes small amount of heat to vaporise water

Water doesn't takes small amount of heat to vaporise. The amount of heat required to vaporise water is known as the latent heat of vaporisation and it is around 40.8 KJ/ mol.

6. Acids

Acids are the substance that add protons (H+) to the solution.

7. 1000 times
A change in 1 pH is equivalent to the change in 10 times concentration of the H+ions.

pH 5 - pH 8= pH 3

103 or 1000

pH 5 is 1000 times more acidic than pH 8.

8. Triglyceride

Triglyceride is a common storage form of a lipid. Triglyceride is a ester of glycerol and three fatty acids.

9. Starch

Starch is a polysaccharide made up of repetitive units of glucose. Plants store photosynthetic food in the form of starch.

10. Glycogen

Glycogen is the storage form of glucose in animals. Glycogen is a branched polysaccharide made up of repetitive glucose residues.