Class 2 Chemistry

Question 1

Molecules

Answer 1

Formed by the interaction of Atoms in certain combination

Question 2

Atoms tend to try to fill the outermost electron shell with maximum number of electrons by either:

Answer 2

Sharing electrons, excepting electrons, donating electron

When the outermost shell is filled the Adam is chemically stable. What outershell only partially filled the Atom is chemically unstable and tends to react with other Atom

Question 3

Compound

Answer 3

A molecule that contains at least two different kinds of Adam

Question 4

Chemical bond

Answer 4

Attractive forces between molecules

Question 5

Ionic bond

Answer 5

Formed when atoms gain lose electrons from outer shell. Held together by electrical attractions between ions of opposite charges.

Question 6

Covalent bond

Answer 6

Chemical bond formed by 2 atoms sharing 1 or more pairs of atoms

Question 7

Hydrogen bonds

Answer 7

Form when hydrogen Atom which is covalently bonded to 1 oxygen or nitrogen atom is attracted to another oxygen or nitrogen

Question 8

Inorganic compounds

Answer 8

Molecules that lack carbon

Question 9

Organic compounds

Answer 9

Always contain carbon and hydrogen

Question 10

pH

Answer 10

an organism must maintain a fairly constant Balance of acids and bases to remain healthy

Question 11

pH scale

Answer 11

7=neutral
Higher than 7 is a base
Lower than 7 is acid

Question 12

Carbohydrates

Answer 12

Large diverse group of organic compounds that include sugars and starches

Consists of Atoms of carbon hydrogen and oxygen

Principal function is to fuel cell activities with a ready source of energy

Question 13

Lipids

Answer 13

Non polar

Essential to structure and function of cells plasma membrane that separate living cells from their environment

Function is energy storage

Question 14

Proteins

Answer 14

Organic compounds that contain carbon, hydrogen, oxygen and nitrogen. Some also contain sulfur.

Essential to all living organisms

Question 15

Amino acids

Answer 15

Are the building blocks of proteins. Only 20 different amino acids occur naturally.

Question 16

DNA

Answer 16

Deoxyribonucleic acid

Substance from which genes are made.

Question 17

RNA

Answer 17

Ribonucleic acid. Control protein synthesis

Question 18

ATP

Answer 18

Principal energy carrying molecule of all cells.

Store chemical energy released by some chemical reactions and provides the energy for reactions that require energy.

Is the intracellular energy source

Question 19

Solution

Answer 19

A homogeneous mixture in which one substance called a solute uniformly dispersed and another substance called a solvent.

May be solid liquid and gas

Question 20

Osmosis

Answer 20

Movement into and out of the cell is an important biological process that depends on the solute concentration

Question 21

Hypertonic and hypotonic

Answer 21

Hypertonic: a solution with a higher osmotic pressure the red blood cell.

Hypotonic on a solution that has a lower osmotic pressure than a red blood cell.

Question 22

Alcohol

Answer 22

Organic compounds that have hydroxyl group bonded to alkane

Question 23

Ketone

Answer 23

The carbonyl group is bonded to two carbon Atoms.

Question 24

Atomic weight

Answer 24

Equal total number of protons and neutrons in the Atom