Exponential Decay
1. Mrs. Tupper bought a hot caramel latte. Afterwards, she decided she wanted an iced caramel latte instead. The latte has a cooling rate of 2.1% per minute. If she places her hot latte, which is 100.0
o
C in a freezer which is 0.0
o
C for 90.0 minutes, what will be the new temperature of her latte?
96.9
o
C
0
o
C
15
o
C
2. Strontium-90 decays at the rate of 3.05% per year. If a nuclear power plant has 150kg of Strontium-90, how much will be remaining in 100.0 year?
7.1 kg
7.104 kg
145.5 kg
3. During a chemical reaction, the amount of sugar decreases at a rate of 1.45% per minute. If a chemist initially has 30.0 grams, how much do they have after half an hour (30.0 minutes)?
29.8
19.4 g
0 g
Copyright © 2006 Donna Tupper.
