Outcome 4 Modeling Test Review

If 10 mg of iodine 131 is given to a patient, how much is left after 24 days? The half-life of iodine-131 is 8 days.

• 1.25mg
• 1.25g
• 10g
• 10mg

Tags

CCSS.HSF.LE.A.4

The half-life of strontium-90 is 25 years. How much strontium-90 will remain after 100 years if the initial amount is 4.0 g?

• 3.0g
• 0.25mg
• 0.3g
• 0.25g

Tags

CCSS.HSF.LE.A.4

What is the half-life of iodine-131?

• 32 days
• 8 days
• 16 days
• 24 days

Tags

CCSS.HSF.LE.A.1

CCSS.HSF.LE.A.2

CCSS.HSF.LE.B.5

Most automobiles depreciate as they get older. Suppose an automobile that originally costs $20,000 depreciates by 28% of its value every year. What is the exact half-life of this automobile?

• 2.11 years

• 3.12 years

• 1/2 years

• 2.81 years

Jack planted a mysterious bean just outside his kitchen window. When he planted the bean, it was 3 cm tall. If the bean grows at a rate of 7% each day.

How long (exactly) will it take to double the height of the plant?

• 10.24 days

• 8.67 days

• 3.47 days

• 14.03 days

What does pH measure?

• the amount of hydrogen (H⁺) ions

• the amount of hydroxide (OH^-) ions

• amount of water

• all of the above

A(n) _______ is a substance with a pH greater than 7.

• Base
• Acid
• Buffer
• Water

A(n) ______ is a substance with a pH less than 7

• Acid
• Alkaline
• Base
• Buffer

What is the pH of a solution that has a [H+] of 2.5 x 10^-5?

• 4.60

• 2.5

• 5.0

• 7

If the number of births in a population is the same as the number of deaths in a population, what will happen to the growth of the population?

• It will increase.
• It will decrease.
• It will stay the same.
• It will fluctuate.