Ch 2 Biology midterm review

Question 1

the smallest unit of an element that still exhibits the characteristics of that element

Accepted Answer

atom

Question 2

pure substances that cannot be further broken down into simpler substances by ordinary reaction

Accepted Answer

elements

Question 3

Anything that has mass and takes up space

Accepted Answer

matter

Question 4

The ability to do work or create change

Accepted Answer

energy

Question 5

the amount of energy required to initiate a chemical reaction is called

Accepted Answer

activation energy

Question 6

A chemical bond between ions of opposite charges

Accepted Answer

ionic bonds

Question 7

energy can neither be created or destroyed

Accepted Answer

first law of thermodynamics

Question 8

Gas, liquids, and solids are all _________________

Accepted Answer

states of matter

Question 9

the process of altering the state of something, its appearance, its combination with substances

Accepted Answer

physical change

Question 10

the smallest unit of a compound that is still that compound in a natural state

Accepted Answer

molecule

Question 11

An atom or group of atoms that has a + or - charge as a result of losing or gaining electrons

Accepted Answer

ion

Question 12

The nucleus is composed of _________________ and _____________that have ______________ charge

Accepted Answer

neutrons, NO, protons, +

Question 13

energy of motion

Accepted Answer

kinetic

Question 14

change that takes place when atoms of a substance bond

Accepted Answer

chemical change

Question 15

These constantly encircle the nucleus and have a ____________ charge

Accepted Answer

Electrons, -

Question 16

A chemical bond formed between atoms as a result of sharing a pair of electrons

Accepted Answer

covalent bond

Question 17

stored energy

Accepted Answer

potential

Question 18

a substance that is made of two or more elements

Accepted Answer

compound

Question 19

whenever energy is used, some of it is rendered unusable

Accepted Answer

second law of thermodynamics

Question 20

expresses the number and type of atoms in a compound

Accepted Answer

molecular formulas

Question 21

The study of substances and the rules that govern their behavior

Accepted Answer

chemistry

Question 22

when only water diffuses through a semipermeable membrane, the process is termed

Accepted Answer

osmosis

Questions 22