lesson 2.1 vocab

Question 1

activation energy

Answer 1

the minimum amount of energy required to initiate a chemical reaction; written as Ea and measured in kilojoules.

Question 2

chemical bond

Answer 2

the forces that hold atoms together, these may be ionic, covalent or metallic.

Question 3

chemical change

Answer 3

a chemical reaction; a process that changes substances into new substances (related word: chemical reaction)

Question 4

chemical property

Answer 4

a characteristic of a substance that is measurable or observable during a chemical reaction; includes pH, heat of combustion, reactivity, etc

Question 5

laws of conversation of mass

Answer 5

a fundamental principle of science stating that mass cannot be created or destroyed in a closed system through ordinary chemical or physical means.

Question 6

physical change

Answer 6

a change that does not effect its chemical composition

Question 7

physical property

Answer 7

a characteristic that can be observed (intensive), such as texture, color, odor, melting point, boiling point, density, or measured (extensive) such as mass, length, volume, that is used to describe matter and can be observed or measured without changing its composition

Question 8

precipitate

Answer 8

solid particles that have been separated from a solution

Question 9

product

Answer 9

the substances that are formed during a chemical reaction; in a chemical reaction the arrows point toward the product

Question 10

reactant

Answer 10

the substances present before a chemical reaction occurs; in a chemical reaction the arrow usually points away from the reactant(s)

Question 11

solute

Answer 11

a substance that has the ability to be dissolved by a solvent to create a solution

Question 12

solution

Answer 12

a mixture in which a solid and a liquid or two liquids are mixed so evenly, that it is not possible to see the separate particles

Question 13

solvent

Answer 13

the substance that dissolves another substance