AnswersSS - TX - Chemistry BUnit Test

Balancing Nuclear Reactions Answers

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An isotope undergoes radioactive decay. The new isotope that forms has an atomic number that is 2 less than the original isotope’s. Which kind of decay has occurred, and how do you know?

A
alpha decay because alpha particles have a large mass
B
beta decay because beta particles can have negative charge
C
alpha decay because alpha particles have two protons and two neutrons
D
gamma decay because gamma rays are photons
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What can form as a result of a chemical reaction?

A
compounds
B
isotopes
C
alpha particles
D
beta particles
3

In alpha decay, alpha particles are ejected from the nucleus. Which equation represents alpha decay?

A
Superscript 241 subscript 95 upper A m right arrow superscript 237 subscript 93 upper N p plus superscript 4 subscript 2 upper H e.
Option A
B
Superscript 18 subscript 9 upper F right arrow superscript 18 subscript 8 upper O plus subscript 0 subscript 1 e.
Option B
C
Superscript 14 subscript 6 upper C right arrow superscript 14 subscript 7 upper N plus superscript 0 subscript negative 1 e.
Option C
D
Superscript 152 subscript 66 upper D y right arrow superscript 152 subscript 66 upper D y plus y.
Option D
4

Two protons and two neutrons are released as a result of this reaction. Rn Po + ?Which particle is released?

Question illustration
A
one alpha particle
B
two beta particles
C
one alpha and one beta particle
D
one high-energy photon
5

What type of particle has no mass or charge?

A
Alpha
B
Beta
C
Gamma
D
Proton
6

How can a scientist assess whether a pure niobium (Nb) sample is responsible for contaminating the lab with radioactivity?

A
Test the niobium sample to see whether it now contains other elements.
B
Test the niobium sample for the presence of niobium oxide compounds.
C
Heat the niobium, and see if the level of radioactivity in the lab increases.
D
Place the niobium under pressure, and see if the level of radioactivity in the lab increases.
7

An atom that has 84 protons and 86 neutrons undergoes a reaction. At the end of the reaction, it has 82 protons and 84 neutrons. What happened to the atom?

A
It accepted radiation in a chemical reaction.
B
It donated neutrons to another atom in a chemical reaction.
C
It emitted an alpha particle in a nuclear reaction.
D
It released a beta particle in a nuclear reaction.
8

While a certain isotope decays, it emits photons. What kind of decay is happening?

A
alpha decay
B
beta decay
C
gamma decay
D
positron decay
9

What is a key difference between chemical and nuclear reactions?

A
In chemical reactions, new compounds are formed. In nuclear reactions, compounds are destroyed.
B
Chemical reactions involve electron rearrangements. Nuclear reactions involve changes to the nucleus.
C
Chemical reactions involve large changes in energy. Nuclear reactions absorb or release small amounts of energy.
D
In chemical reactions, only alpha radiation is emitted. In nuclear reactions, alpha, beta, and gamma decay may occur.
10

What is the most penetrating kind of radiation product that can be shielded with aluminum foil?

A
alpha particles
B
beta particles
C
gamma rays
D
high-energy photons

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