Vocab. Properties and Change part 2

Question 1

Chemical Reaction

Answer 1

The process in which atoms are rearranged to form new substances, the processes by which chemicals interact to form new chemicals with different compositions

Question 2

Chemical Formula

Answer 2

Uses chemical symbols and numbers to represent a given substance. Ex - H20

Question 3

Chemical Equation

Answer 3

An expression that uses symbols to show the relationship between the starting substance and the new substances that are produced be a chemical reaction

Question 4

Coefficient

Answer 4

A whole number placed in front of a chemical formula to tell the reader how many copies of that molecule are needed to balance the equation. (2H20 - there are 2 water molecules)

Question 5

Subscript

Answer 5

A small-sized number on the bottom right of the symbol. It refers to the number of atoms of the element (H20 - there are 2 Hydrogen atoms in water, H-H-O)

Question 6

Reactants

Answer 6

The substances that participate in the chemical reaction

Question 7

Product

Answer 7

The substances that are formed in a chemical reaction.

Question 8

Endothermic Reaction

Answer 8

Any chemical reaction that absorbs heat from its environment, feels cold

Question 9

Exothermic Reaction

Answer 9

a chemical reaction that releases energy by light or heat, feels hot

Question 10

Law of Conservation of energy

Answer 10

States that energy cannot be created or destroyed, but can only be changed from one form to another.