Chemical Reactions

Question 1

Valence electrons come together because

Answer 1

Of the number of valence electrons they have.

Question 2

Using periodic table

Answer 2

You can use the periodic table family members to figure out the valence electrons.

Question 3

How many valence electrons do the elements in family 2 have

Answer 3

2

Question 4

How many valence electrons do the elements in family 15 have

Answer 4

5 (ignore 1)

Question 5

Elements in the same column (family) share the same number of

Answer 5

Valence electrons so they have similar reactivity

Question 6

What determines how well an element can combine with another element to make a new substance

Answer 6

Valence electrons

Question 7

Reactivity

Answer 7

Two elements combining to make a new substance

Question 8

How do compounds form

Answer 8

Through chemical reaction

Question 9

Why do chemical reactions happen

Answer 9

So atoms can fill their last energy level

Question 10

Na+Cl is what

Answer 10

NaCl

Question 11

Sodium chlorine

Answer 11

Sodium transfers an electron to chlorine and makes sodium chloride/salt

Question 12

New substances have

Answer 12

New properties both chemical and physical

Question 13

Process of making new. Substances

Answer 13

Chemical reaction

Question 14

A chemical reaction is also

Answer 14

Chemical change

Question 15

Chemical reactions are written as

Answer 15

Equations which are called chemical equation

Question 16

2Na + 2H ₂O

Answer 16

2NaOH+ H ₂

Question 17

Arrow in chemical equations

Answer 17

Yield (makes or creates)

Question 18

Reactants

Answer 18

The molecules that go into the equation

Question 19

Products

Answer 19

The molecules that come out of the equation

Question 20

Exothermic reactions

Answer 20

Reaction that releases heat causing temps turn around it to rise

Question 21

Endothermic

Answer 21

Reaction that absorbs heat causing surroundings to cool

Question 22

Law of conservation states that

Answer 22

Chemical reactions matter is neither created or destroyed

Question 23

Atoms that go into a reaction

Answer 23

Are the same atoms that come out just rearranged into different molecules

Question 24

What determines the properties of a mineral

Answer 24

The arrangement of atoms

Question 25

Least reactive family

Answer 25

18