AnswersChemistry Credit Recovery BEnthalpy of Reaction

Types of Radioactive Decay Answers

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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
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Consider the table below that summarizes the types of materials that can block the 3 different types of radiation.Material123LeadStoppedStoppedStoppedClothNot stoppedStoppedStoppedAluminum foilNot stoppedStoppedStoppedWoodNot stoppedStoppedStoppedPaperNot stopped StoppedNot stoppedThick concreteStoppedStoppedStoppedBased on the table, at which numbered spot in the table does each type of radiation belong?

A
1 = beta; 2 = alpha, 3 = gamma
B
1 = alpha; 2 = beta, 3 = gamma
C
1 = beta; 2 = gamma, 3 = alpha
D
1 = gamma; 2 = alpha, 3 = beta
3

What type of particle has no mass or charge?

A
Alpha
B
Beta
C
Gamma
D
Proton
4

Which statement correctly compares chemical reactions with nuclear reactions?

A
In chemical reactions, new isotopes are formed. In nuclear reactions, new compounds are formed.
B
Chemical reactions can be represented by balanced equations. Nuclear reactions cannot be represented by balanced equations.
C
In chemical reactions, small amounts of energy can be absorbed or released. In nuclear reactions, changes in energy are much larger.
D
In chemical reactions, only protons and neutrons are affected. In nuclear reactions, only electrons are affected.
5

What can form as a result of a chemical reaction?

A
compounds
B
isotopes
C
alpha particles
D
beta particles
6

A scientist notices that a lump of niobium is warm to the touch and wonders if nuclear reactions are taking place in the metal. How can she find out?

A
Measure the metal’s temperature.
B
Check for the presence of alpha, beta, and gamma particles.
C
Look for the presence of niobium compounds.
D
Place the niobium in a pressurized container, and see if the lump becomes warmer.
7

An isotope undergoes radioactive decay by emitting radiation that has a –1 charge. What other characteristic does the radiation have?

A
some shielding required
B
no mass
C
large mass
D
high penetrating power
8

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.
9

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
10

Which can have either a positive charge or a negative charge when they are released during radioactive decay?

A
alpha particles
B
beta particles
C
positrons
D
photons

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