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3 years ago

I WILL GIVE EXTRA POINTS AND BRAINLIEST I JUST NEED SOMEONE TO ANSWER THIS QUESTIONS!!

Chemistry

2 answers:

olga nikolaevna [1]3 years ago

8 0

Answer:

Explanation:

Rufina [12.5K]3 years ago

8 0

The answer is A I think

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3 years ago

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The units used to measure heat are?

Akimi4 [234]

Answer&Explanation:

The unit used to measure Heat is joule equal to that of Energy and is abbreviated as (J)

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3 years ago

A sample of 28 Mg decays initially at a rate of 53500 disintegrations per minute, but the decay rate falls to 10980 disintegrati

prisoha [69]

Answer : The half life of 28-Mg in hours is, 6.94

Explanation :

First we have to calculate the rate constant.

Expression for rate law for first order kinetics is given by:

$k=\frac{2.303}{t}\log\frac{a}{a-x}$

where,

k = rate constant

t = time passed by the sample = 48.0 hr

a = initial amount of the reactant disintegrate = 53500

a - x = amount left after decay process disintegrate = 53500 - 10980 = 42520

Now put all the given values in above equation, we get

$k=\frac{2.303}{48.0}\log\frac{53500}{42520}$

$k=9.98\times 10^{-2}hr^{-1}$

Now we have to calculate the half-life.

$k=\frac{0.693}{t_{1/2}}$

$9.98\times 10^{-2}=\frac{0.693}{t_{1/2}}$

$t_{1/2}=6.94hr$

Therefore, the half life of 28-Mg in hours is, 6.94

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3 years ago

Blank are atoms that carry an electric charge

vampirchik [111]

Ions. Im 99.9% sure haha.

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3 years ago

Why are elephants made up of many cells

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Answer: Cells from the smallest to the largest of mammals often seem to be “one size fits all.” Now a closer look reveals that whether a cell lives in an elephant, mouse or something in between can make a big difference in its life

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