Equations

Question 1

Chemical equations represent

Answer 1

Chemical reactions

Question 2

the starting materials in an equation are called the _______

Answer 2

Reactents

Question 3

the ending materials are called the __________

Answer 3

Products

Question 4

the arrow in the equation means _________

Answer 4

yeild or produce

Question 5

A solid formed during a chemical reaction is called a ______

Answer 5

precipitate

Question 6

Law of conservation of matter

Answer 6

Matter is neither created nor destroyed during a chemical reaction

Question 7

Δ=

Answer 7

heat in a chemical equation

Question 8

DC=

Answer 8

electricity in a chemical equation

Question 9

seven elements that exist in diatomic molecules

Answer 9

H2, O2, F2, Br2, I2, N2, Cl2

Question 10

what is the difference between a physical and chemical change

Answer 10

physical changes= change state of matter

chemical change=produce new substances

Question 11

exothermic reaction

Answer 11

absorbs heat

Question 12

endothermic reaction

Answer 12

needs heat

Question 13

EA (activation energy)

Answer 13

Energy required to get the reactant going