What does mass defect mean?

the difference between the mass of an isotope and the mass number

The physical conditions that change the direction of a reaction are

concentration, solubility, temperature

Why do elements undergo fisson

The extra neutron cause them to become less stable and break

What does E=mc2 mean for a nuclear reaction?

Energy = mass x speed of light2

What is an endothermic reaction

A reaction with stronger reactent

When is a bond more stable?

stronger attraction between the nucleus and the bonded electron

same # of protons, Different # of neutrons

What is an exothermic reaction

A reaction with stronger products

A way to measure acidity of a solution

Avogadro's number (6.02 x 10^23)

Why are heavier isotopes more unstable?

They have more electrons pushing against each other

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Chemistry Final

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Questions 47

Answers

1
How many neutrons are released from fission?
always 3 and u-238
always 3
maybe 3
typically 3
2
What does mass defect mean?
the difference between the mass of an atom and the mass number
the similarities between the mass of an isotope and the mass number
the difference between the math of an isotope and the mass number
the difference between the mass of an isotope and the mass number
3
Whats your opinion on Chemistry?
its stupid
Its fun (nerd)
It sucks
I like it (shut up, no you don't)
4
What size atom is most stable
strong atoms
Big atoms
Adam
small atom
5
What products are created fro Uranium - 235 fission
CO2 and H2O
Krypton-92 and Barium-141
Lead-82
Hydrogen-2 and Plutonium- 245
6
The physical conditions that change the direction of a reaction are
concentration
solubility
temperature
Seaweed
7
Whats the purpose of radioactive decay
To become less stable
To become stable
to gain trust
To gain energy
8
Why do elements undergo fisson
The extra neutron cause them to become less stable and break
The extra positron cause them to become less stable and break
The extra photons cause them to become less stable and break
The extra electrons cause them to become less stable and break
9
What does E=mc² mean for a nuclear reaction?
Energy = mass x speed of light
Energy = mass x speed of lead2
Energy = mass x speed of light2
Energy = math x speed of light2
10
Why does hydronium (H₃O⁺) prevent oyster shells from forming?
It bonds with the water
It bonds to the carbonate
It bond with the hydronium
It bonds to the calcium
11
What can cause fluctuation in pH
Migrations
Seasons
Scientist Data is wrong
Colors
12
What is an endothermic reaction
A reaction with stronger reactent
A reaction with stronger bonds
A reaction with weaker protons
A reaction with stronger products
13
Which is stronger: A mole of Octane or a mole of Hydrogen
Mole of Oxygen
Mole of Heluim
mole of Hydrogen
mole of Octane
14
What is neutral on the pH scale
7.5
8
7
6.8
15
How does mass change in a nuclear equation?
It changes upwards slightly
It decreases slightly
It increases slightly
it stays the same
16
When is a bond more stable?
stronger attraction between the protons and the bonded electron
stronger attraction between the nucleus and the bonded electron
weaker attraction between the proton and the bonded electron
weaker attraction between the nucleus and the bonded electron
17
A decrease by 0.1 is a what percent decrease in pH?
30%
80%
25%
3%
18
Which is stronger a gram of Hydrogen or a gram of Octane?
gram of Hydrogen
gram of Oxygen
gram of Heluim
gram of Octane
19
What does H2O and CO3 make
Ca+2 (calcium)
HCO3- (bicarbonate)
H2CO3 (carbonic acid)
NaCL (Sodium Choride)
20
What is an iotope
same # of electrons, Different # of neutrons
same # of protons, Different # of neutrons
same # of Photons, Different # of neutrons
same # of electrons, Different # of protons
21
What is a base on the pH scale
7.9 - 19
7.1-14
1-14
8-14
22
Which is most dangerous
Alpha
Gamma
Beta
Sigma
23
What is an exothermic reaction
A reaction with stronger reactent
A reaction with stronger bonds
A reaction with weaker protons
A reaction with stronger products
24
What particle is responsible for the elemental identity
Neutrons
Protons
Photons
Electrons
25
H2CO3 + H2O -->
H20 + HCO4
H30 + HCO3
H4O + H2O
H3O + H2O
26
What is the most common isotope we use in fission/ talk about
Uranium-238
Plutonium- 243
Uranium-239
Uranium-235
27
Strong atoms have more what in the nucleus
Electrons
Photons
Neutron
Protons
28
Ratio of Atmospheric CO2 to Ocean CO2
2-1
1-2
2+1
1+2
29
What is the pH scale
A way to measure the acidity of a soild
A way to measure acidity of a solution
A way to measure saltiness of a substance
A way to measure color of a substance
30
The ocean has increased its acidity by what % since the pre-industrial times
20%
25%
30%
35%
31
What is a mole
A unit of time
Avocado number (6.2 x 10^21)
Avogadro's number (6.02 x 10^23)
A fuzzy animal
32
What attraction prevents protons from flying apart from each other in the nucleus?
Strong forces
Weak forces
Covalent bonds
Ionic bonds
33
A reaction that can change direction is called a...
Inverse reaction
rational reaction
Invaluable reaction
reversible reaction
34
what is the highest stable element?
Le - Lead - 206
Ph - Lead -206
Pb - Lead - 206
Pb - Lead - 82
35
How many protons does uranium have
143
92
235
U
36
What is found in the nucleus?
Proton and electrons
Protons and Photons
Neutrons and electrons
Protons and neutrons
37
What does mass do in a nuclear reaction
It converts to mass
It converts to energy
Nothing
absolutely nothing
38
Gamma wave are
Fiction
Stupid
Pure energy
Harmless
39
Why are heavier isotopes more unstable?
They have more positrons pushing against each other
They have more electrons pushing against each other
They have more photones pushing against each other
They have more protons pushing against each other
40
Which is smaller: Alpha or Beta
Alpha
Gamma
Electrons
Beta
41
PLEASE DON'T FAIL
I WON"T
I'M GOING TO
LETS OVERTHROW HARKLEROAD TO NOT HAVE THIS STUPID FINAL
AAAAAAAAHHHHH
42
What is the reason ions in salts come together to form compounds?
To make change
To balance charges
To mimic charges
To electrically charge
43
How many neutrons does uranium have
235
92
143
U
44
What is an acid on the pH scale
1-5
0-6.9
2-7
3-7
45
When pH drops Dissolved CO2
Increases
Decreases
Goes on a roller coaster
Remains stable
46
The ocean absorbs approximately what % of carbon dioxide emissions.
90%
25%
20%
30%
47
An Aqueous solution...
Dissociate in waste
Dissociate in water
Dissolves in water
Dissolve in water

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