Chapter 10 Review activity!

What type of nuclear decay produces energy instead of particles?

• A. Alpha

• B. Beta

• C. Gamma

• D. Body

When the mass of an atom decreases by 4 and the atomic # decreases by 2, the nucleus has

emitted a __________.• A. Alpha

• B. Beta

• C. Gamma

• D. Body

What type of radiation is emitted when carbon 14 changes into

nitrogen 14?

• A. Alpha

• B. Beta

• C. Gamma

• D. Body

Alpha emitting materials can be a serious health hazard only if

• A. They strike the skin

• B. They are inhaled or eaten

• C. They come from the sun

• D. None of these

The half-life of kovacium is 32 years. After about 96 years,

how much of a sample of kovacium will be left?

• A. 1/2

• B. 1/3

• C. 1/8

• D. none

The half-life of a radioisotope is the amount of time required for

• A. half the sample to decay.

• B. all the sample to decay.

• C. the age of an artifact to be calculated.

• D. detectable radiation to be absorbed by a sample.

The half-life of an isotope is one day. At the end of two days the

amount that remains is

• A) none.

• B) one-half.

• C) one-quarter.

• D) one-eighth.

The half-life on an isotope is one day. At the end of three

days, how much of the isotope remains?

• A) none.

• B) one-half.

• C) one-quarter.

• D) one-eighth.

The half-life of a radioactive substance is independent of

• A) the number (if large enough) of atoms in the substance.  

• B) the temperature of the substance.  

• C) the age of the substance.  

• D) all of these.

Which of the following isotopes is radioactive?

• A) carbon-12

• B) carbon-14

• C) carbon-6

• D) None are radioactive in nature.

There is a greater proportion of carbon-14 in

• A) new bones.

•

• B) old bones.

•

• C) bones do not have any carbon-14.

• D) same in each.

Carbon dating requires that the object being tested contains

• A) organic material.

• B) inorganic material.

• C) charcoal.

• D) sugar molecules.

The half-life of carbon 14 is 5730 years. If a 1-g sample of old carbon is 1/8 as radioactive as 1 g of a current

sample, then the age of the old sample is about

• A) 716 years.

• B) 11,500 years.

• C) 17,200 years.

• D) 22,900 years.

The half-life of carbon 14 is 5730 years. How long will it take for all of the sample to become stable?

A) 5730 years.

B) 11,500 years.

C) 17,200 years.

D) It will never happen.

During nuclear fission, great amounts of energy are produced from

• A. very small amounts of mass.

• B. tremendous amounts of mass.

• C. a series of chemical reactions.

• D. particle accelerators.

Transmutation involves • A. nuclear change.

• B. chemical change.

• C. neither nuclear change nor chemical change.

• D. nuclear change and chemical change.

242

96Cm + 4

2He 1

1n + ?

• A. 242

96Cm

• B. 245

97Cf

• C. 247

99Es

• D. 239

94Pu

Mr. Kovacs is ________!

• A. radioactive

• B. made of inorganic material.

• C. made of organic material.

• D. Both A and C