Lesson 6 - Chemical Reactions

Question 1

In a chemical equation, which comes first? The reactants or the products?

Answer 1

Reactants

Question 2

In a chemical equation, which comes second? The reactants or the products?

Answer 2

products

Question 3

What does + mean

Answer 3

and or plus

Question 4

What does → mean

Answer 4

“reacts to form” or “yields”

Question 5

What does (s) mean

Answer 5

solid

Question 6

What does (l) mean

Answer 6

liquid

Question 7

What does (g) mean

Answer 7

gas

Question 8

what does (aq) mean

Answer 8

aqueous (water)

Question 9

what does an arrow with a triangle above it mean

Answer 9

heat was added

Question 10

What does ⇌ mean

Answer 10

reversible reaction

Question 11

What are the four indications of a Chemical Reaction?

Answer 11

Heat and light, production of gas, formation of a precipitate, and color change

Question 12

True or False: a Chemical equation does NOT have to be in simplest form

Answer 12

false

Question 13

True or False: a Chemical equation DOES have to be in simplest form

Answer 13

True

Question 14

Which elements gets 2 atoms automatically when by themselves

Answer 14

elements that end with “gens”

Question 15

Which of the following would NOT get two atoms: Hydrogen, Fluorine, Oxygen, Chlorine, Nitrogen, Iodine, Carbon

Answer 15

Carbon

Question 16

What type of reactions is this: A + B → AB

Answer 16

Synthesis

Question 17

What type of reactions is this:
AB + C → B+AC

Answer 17

Single Replacement

Question 18

What type of reaction is this:
AB → A + B

Answer 18

Decomposition

Question 19

What type of reaction is this:
AB + CD → AC+ BD

Answer 19

Double Replacement

Question 20

What type of reaction is this:
O2 + ___ → CO2 + H2O

Answer 20

Combustion

Question 21

What is the Activity Series

Answer 21

a list of organized elements to which certain elements can or cannot replace one another

Question 22

True or False: in the Activity Series, an element on bottom CAN replace an element on top

Answer 22

False

Question 23

True or False: in the Activity Series, an element on bottom CAN’T replace an element on top

Answer 23

True

Question 24

Which kind of reactions use the activity series

Answer 24

Single displacement

Question 25

When replacing an element, do metals gain or lose energy

Answer 25

lose

Question 26

When replacing an element, do nonmentals gain or lose energy

Answer 26

gain

Question 27

The (more/less) active element is on top in the Activity Series

Answer 27

More