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U02 Core Concepts Review

Total questions: 35

Worksheet time: 44mins

Name
Class
Date
1.

This particle is represented by the atomic number AND is used to identify all atoms.

a)

Neutron

b)

Proton

c)

Electron

d)

Idontknowatron

2.
What is found in the nucleus of atoms?
a)
Protons and electrons.
b)
Protons, neutrons, and electrons.
c)
Protons and neutrons.
d)
Neutrons and electrons.
3.

Isotopes have the same number of ____, but different number of ____.

a)

neutrons; protons

b)

protons; electrons

c)

protons + electrons; neutrons

d)

electrons; protons

4.

How many neutrons are in fluorine-20?

a)

20

b)

11

c)

10

d)

9

5.
Where are electrons of an atom found?
a)
Nucleus
b)
Electron Cloud
c)
Some are in the nucleus and some in the electron cloud.
d)
They are moving everywhere.
6.

What evidence did Rutherford use to support the idea that the atom was mostly empty space?

a)

the vast majority of the alpha particles went through the foil unaffected.

b)

the vast majority of the alpha particles were deflected at 90 degrees.

c)

one alpha particle was deflected by the gold foil.

d)

beams of alpha particles were deflected by magnets.

7.

Which is a finding attributed to Rutherford's Gold Foil Experiment?

a)

atoms are indivisible and have a dense positive nucleus.

b)

atoms are divisible and have multiple layers of electrons scattered uniformly about the atom.

c)

atoms are like plum pudding with positive and negative charges uniformly scattered throughout the atom.

d)

atoms are mostly empty space with a dense positive nucleus.

8.
Subatomic particles with a positive charge
a)
neutrons
b)
atomic mass
c)
protons
d)
isotopes
9.
Subatomic particles that are neutral in charge
a)
Neutrons
b)
Protons
c)
Nucleus 
d)
Electrons
10.
How many protons does this isotope of titanium have?
a)
48
b)
22
c)
26
d)
70
11.
In a correctly written symbol what would be located in the "A" position?
a)
number of neutrons
b)
atomic number
c)
number of electrons 
d)
mass number
12.
What quantities vary between isotopes of an element?
a)
protons, electrons, and atomic mass
b)
protons, electrons, and atomic number
c)
neutrons and electrons
d)
neutrons and atomic mass
13.
which atom has  4 neutrons?
a)
Li-6
b)
Li-7
c)
Li-8
d)
they have the same # of neutrons
14.
An atom becomes _________ when it gains electrons.
a)
Positive
b)
Negative
c)
Neutral
d)
Invinsible
15.
An atom becomes _______ when it loses electrons.
a)
Positive
b)
Negative
c)
Neutral
d)
Invinsible
16.

What is a Rubidium ion's symbol? (Z=37)

a)

Rb-

b)

Rb+

c)

Rb-2

d)

Rb+2

17.

What is the ionic symbol for Selenium? (Z=34)

a)

Se-2

b)

Se+2

c)

Se-3

d)

Se+3

18.

How many neutrons does this isotope of titanium have?

a)

48

b)

22

c)

26

d)

70

19.

What is the correct name for this isotope

a)

boron - 9

b)

fluorine - 13

c)

beryllium - 9

d)

beryllium - 5

20.

Which of these are correct statement about this atom?

a)

It has a +3 charge

b)

It is stable

c)

Mass Number is 15

d)

It is Nitrogen

e)

It is Oxygen

21.
Which of the following is a sign that a chemical reaction has occurred?
a)
change in shape
b)
melting
c)
bubbles of gas appear
d)
dissolving
22.

During chemical reactions, bonds are...

a)

broken only

b)

formed only

c)

both broken and formed

d)

none of the above are correct

23.

It takes energy to ________________ bonds.

a)

break

b)

form

24.

Energy is released when bonds are _________________.

a)

Broken

b)

Formed

25.

During a particular chemical reaction it takes 100 Kj of energy to break all the bonds and 150 Kj of energy is released when the new bonds form. Which is true about the overall reaction?

a)

It is endothermic and absorbs energy.

b)

It is exothermic and releases 150 Kj

c)

It is exothermic and releases 50 Kj

d)

It is endothermic and releases energy.

26.

What type of reaction is this?

a)

Exothermic

b)

Endothermic

c)

Kinetic

d)

Potential

27.

How much activation energy is needed for this reaction?

a)

300 KJ

b)

500 KJ

c)

400 KJ

d)

100 KJ

28.

What is the Heat of Reaction ΔH\Delta H  for this reaction?

a)

-200 KJ

b)

200 KJ

c)

400 KJ

d)

-300 KJ

29.

What is the Heat of Reaction ΔH\Delta H  for this the REVERSE reaction?

a)

-200 KJ

b)

200 KJ

c)

400 KJ

d)

-300 KJ

30.
Which of the following is a sign that a chemical reaction has occurred?
a)
change in shape
b)
melting
c)
bubbles of gas appear
d)
dissolving
31.
What kind of reaction is this?
a)
Endothermic
b)
Exothermic
c)
Cannot be determined
32.
What letter represents the energy of the products?
a)
A
b)
B
c)
C
d)
D
33.

Which letter corresponds to the activation energy for the forward reaction?

a)
A
b)
B
c)
C
d)
D
34.

How would you calculate the Change in Enthalpy (ΔH) for the forward reaction?

a)

ΔH = C - A

b)

ΔH = D - A

c)

ΔH = C - D

d)

ΔH = A - D

35.

Which factor increases both collision frequency and collision energy?

a)

pressure

b)

concentration

c)

adding a catalyst

d)

temperature

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