Science Exam

Question 1

Be

What is the name of the element?

Answer 1

Beryllium

Question 2

Na

What is the name of the element?

Answer 2

Sodium

Question 3

What is the atomic number for F?

Answer 3

9

Question 4

What does Li stand for and what is its atomic mass?

Answer 4

Lithium - 6.94

Question 5

How many electrons does Na possess?

Answer 5

11

Question 6

How many neutrons/protons does Sodium have in its nucleus?

Answer 6

11

Question 7

How many electrons in the inner-most circle of an atom?

Answer 7

2

Question 8

How many electrons in the second circle of an atom?

Answer 8

8

Question 9

How many electrons on the third circle of an atom?

Answer 9

18

Question 10

What are the rows called on the periodic table?

Answer 10

Periods

Question 11

What are the coloumns called on the periodic table?

Answer 11

Groups

Question 12

What is a valence shell?

Answer 12

The most-outer circle of the atom.

Question 13

Oxygen

How many electrons are found in the valence shells of the following elements:

Answer 13

6

Question 14

Beryllium

How many electrons are found in the valence shells of the following elements:

Answer 14

2

Question 15

Sodium

How many electrons are found in the valence shells of the following elements:

Answer 15

1

Question 16

Krypton

How many electrons are found in the valence shells of the following elements:

Answer 16

8

Question 17

Are electrons positive or negative?

Answer 17

Negative

Question 18

Atoms that lose electrons will have what: a positive or negative charge?

Answer 18

Positive

Question 19

What is an ionic compound?

Answer 19

Metal paired with a Non-metal

Question 20

What is a precipitate?

Answer 20

A reaction that is (i) insoluble in water

Question 21

What is the key for precipitation reactions?

Answer 21

AB + CD > AD + BC

Question 22

Why do non-metals need to bond with metals?

Answer 22

Non-metals = negative charge
Metals = positive charge

negatives attract positives

Question 23

Surface Area

Explain in terms of collision theory how reaction rate changes with:

Answer 23

• exposes more reactant particles
• increase amount of particles that collide
• increases rate of reaction

Question 24

Increasing Temperature

Explain in terms of collision theory how reaction rate changes with:

Answer 24

• provides particles with more energy
• molecules collide > more likely to form products
• increases rate of reaction

Question 25

# Adding a Catalyst Explain in terms of collision theory how reaction rate changes with:

Answer 25

- chemical that speeds up reaction - does not get used up - lower energy required to covert reactants to products

Question 26

# Increasing Concentration: Explain in terms of collision theory how reaction rate changes with:

Answer 26

- increases amount of reactant particles - increases number of collisions - increase rate of reaction

Question 27

Are protons positive or negative?

Answer 27

Positive

Question 28

What is an atoms configuration?

Answer 28

a, b, c | For each circle - how many electrons are on each one.

Question 29

# Explain what it means when: Potassium (K) turns into a potassium ion (K1+)

Answer 29

- potassium **loses** an electron (from valence shell) - means it has 18 electrons and 19 protons - **+ 1 positive charge**

Question 30

# Explain what it means when: Chlorine (Cl) turns into a chlorine ion (Cl1-)

Answer 30

- chlorine **gains** an electron (onto valence shell) - means it has 18 electrons and 17 protons - **-1 negative charge**

Question 31

Sketch a Potassium Ion

Answer 31

Paper answer

Question 32

Sketch a Chlorine Ion

Answer 32

Paper answer