5.3h

Identify an example of each of the three states of matter present when the candle is burning.

• The hard wax of the candle

• Gas

• The fire/flame

• Solid

• The melting wax

• Liquid

Tags

NGSS.5-PS1-3

List the steps of the scientific method

d

e

f

c

b

a

Ask a question

Analyze results

Communicate results

Form a hypothesis

Conduct experiment

Draw conclusions

Tags

NGSS.HS-PS1-3

NGSS.HS-PS3-4

What is the half-life of a radioactive isotope if it decays to 25% of its original amount in 5.3 hours?

• 2.65 hours

• 5.3 hours

• 10.6 hours

• 1.325 hours

Tags

NGSS.HS-PS1-8

A scientist measures the decay of a substance and finds that it reduces to half its quantity in 5.3 hours. What is this time period called?

• Decay constant

• Half-life

• Full-life

• Quarter-life

Tags

NGSS.HS-PS1-8

If a sample of a radioactive element has a half-life of 5.3 hours, how much of a 100g sample will remain after 10.6 hours?

• 50g

• 25g

• 12.5g

• 75g

Tags

NGSS.HS-PS1-8

Which of the following best describes the concept of half-life in radioactive decay?

• The time it takes for a substance to completely decay

• The time it takes for half of the radioactive atoms to decay

• The time it takes for a substance to double in quantity

• The time it takes for a substance to reach a stable state

Tags

NGSS.HS-PS1-8

A radioactive isotope has a half-life of 5.3 hours. How many half-lives have passed after 21.2 hours?

• 2

• 3

• 4

• 5

In an experiment, a scientist observes that a radioactive sample decreases to one-eighth of its original mass in 15.9 hours. What is the half-life of the sample?

• 5.3 hours

• 7.95 hours

• 10.6 hours

• 3.975 hours

Tags

NGSS.HS-PS1-8

What fraction of a radioactive sample remains after three half-lives?

• 1/2

• 1/4

• 1/8

• 1/16

Tags

NGSS.HS-PS1-8

If a radioactive element has a half-life of 5.3 hours, how long will it take for the element to decay to 12.5% of its original amount?

• 10.6 hours

• 15.9 hours

• 21.2 hours

• 26.5 hours

Tags

NGSS.HS-PS1-8