Answer:
I think the best answer is (5) because catalyst are known to speed up a reaction without being changed
Explanation:
I need a help of math.
please can someone help me ?
Answer:
nnkkkkhjkkhuokjhllkllllllll
Insulation wraps because independent is the variable you are changing to affect the dependent variable (what you are measuring)
Answer:
12.50g
Explanation:
T½ = 2.5years
No = 100g
N = ?
Time (T) = 7.5 years
To solve this question, we'll have to find the disintegration constant λ first
T½ = In2 / λ
T½ = 0.693 / λ
λ = 0.693 / 2.5
λ = 0.2772
In(N/No) = -λt
N = No* e^-λt
N = 100 * e^-(0.2772*7.5)
N = 100*e^-2.079
N = 100 * 0.125
N = 12.50g
The sample remaining after 7.5 years is 12.50g