Biology

Question 1

Atom

Answer 1

Building block of matter

Question 2

Nucleus

Answer 2

Center of an Atom

Question 3

Protons

Answer 3

(+) Positive Charge

Question 4

Nuetrons

Answer 4

(=) Nuetral

Question 5

Electrons

Answer 5

(-) Negative

Question 6

What is an Element?

Answer 6

pure substance, cannot be broken down

Question 7

Isotopes

Answer 7

Atoms of same element w/ different # of neutrons. C-14

Question 8

What is Carbon Dating?

Answer 8

Measure of radioactive (unstable) C-14 levels relative to C-12. Half Life =5730 years

Question 9

Compounds

Answer 9

pure substance, can be broken down (chemically), two or more combined elements.

Question 10

Covalent Bond

Answer 10

electrons that are shared between
atoms.

Question 11

Result of Covalent Bonds?

Answer 11

Compound/Molecule is formed

Question 12

Ionic Bond

Answer 12

The attraction between oppositely charged atoms

Question 13

Ion

Answer 13

An atom if it gains or loses an electron.

Question 14

van der Waals Forces

Answer 14

attractive forces between the positive and negative regions on molecules

Question 15

Chemical Reactions

Answer 15

Rearrangement of
molecular or ionic structure.

Question 16

Reactants

Answer 16

Starting substances

Question 17

Products

Answer 17

Substances formed by a reaction

Question 18

Activation Energy

Answer 18

minimum amount of energy
required for reaction.

Question 19

Speed up reaction/lower activation energy by

Answer 19

↑ temperature
- ↑ concentration of molecules
- ↑ pressure
- add a catalyst/enzyme!

Question 20

Exothermic

Answer 20

releases energy as heat, more energy
in reactants than products (feels warm).

Question 21

Endothermic

Answer 21

absorbs energy, more energy in
products than reactants (feels cold).

Question 22

Catalyst

Answer 22

substance that lowers activation
energy required (speeds up reaction).

Question 23

Enzyme

Answer 23

ends in “ase”

Question 24

Substrate

Answer 24

Reactants that bind to the enzyme

Question 25

Active Site

Answer 25

Location where reactants bind to the enzyme

Question 26

Polar Molecule

Answer 26

has an uneven charge (+/-) distribution.

Question 27

What is held together by covalent bonds?

Answer 27

H2O (water)

Question 28

4 properties of water?

Answer 28

Less dense when frozen Regulates Global Temperature Capillary Action Universal Solvent

Question 29

Cohesion

Answer 29

waters attraction to itself

Question 30

Adhesion

Answer 30

waters attraction to other molecules

Question 31

Mixture

Answer 31

Combination of 2 substances

Question 32

Homogeneous

Answer 32

Uniform

Question 33

Heterogenius

Answer 33

Different

Question 34

Solution

Answer 34

Homogeneous Mixture

Question 35

Solvent

Answer 35

A substance that dissolves another

Question 36

Solute

Answer 36

A substance that is dissolved

Question 37

Acid

Answer 37

releases hydrogen ions (H+)

Question 38

Base

Answer 38

releases hydroxide ions (OH)

Question 39

pH

Answer 39

Measures the concentration of H+ ions in a solution

Question 40

pH scale ranges from

Answer 40

0-14

Question 41

pH scale acid?

Answer 41

0-6

Question 42

pH Neutral

Answer 42

7

Question 43

pH Base

Answer 43

8-14