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Alisiya [41]
3 years ago
13

Question 1: Which of the following is an example of an exothermic chemical reaction?

Chemistry
1 answer:
Allushta [10]3 years ago
5 0

Answer:

the answer is D

Explanation:

the reason how ik this is that i already did this test so yea

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Which body tissue or organ contains the most mitochondria?
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Muscle tissue has has the most mitochandria
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marin [14]

Answer:

snow, or freezing rain?

Explanation:

because freezing rain can occur then, but snow is more common.

7 0
2 years ago
Strontium-90 is a radioisotope that will decrease in mass by one-half every 29 years. How many years will it take for a 10.0-gra
Lelechka [254]

Answer: It will take 29 years for a 10.0-gram sample of strontium-90 to decay to 5.00 grams

Explanation:

Radioactive decay process is a type of process in which a less stable nuclei decomposes to a stable nuclei by releasing some radiations or particles like alpha, beta particles or gamma-radiations. The radioactive decay follows first order kinetics.

Half life is the amount of time taken by a radioactive material to decay to half of its original value.

Half life is represented by t_{\frac{1}{2}

t_{\frac{1}{2}=\frac{0.693}{\lambda}

\lambda = rate constant

Given : Strontium-90 decreases in mass  by one-half every 29 years , that is half life of Strontium-90  is 29 years.

As half life is independent of initial concentration, it will take 29 years for a 10.0-gram sample of strontium-90 to decay to 5.00 grams as the amount gets half.

7 0
3 years ago
How many ribs does grandfathers skeleton have
Harrizon [31]
Same as a normal human would have. 24 ribs or 12 pairs of ribs in each side. There is no discrepancy in the number of ribs whether the human is old or young; male or female (contrary to the unpopular belief that a male has an extra pair of ribs). 
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