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2 years ago

A person who controls access to the decision maker is called a(n)

Chemistry

1 answer:

damaskus [11]2 years ago

6 0

Answer:

Wdym?

Explanation:

I don't understand this question

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What does a dissolved salt look like?

anzhelika [568]

Answer:

Water but with salt

Explanation:

You can’t see it but it’s there

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2 years ago

A solution containing aluminium ions reacts with a solution containing hydroxide ions to form a

Xelga [282]

Answer:

Explanation:

the answer is d white precipitate

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2 years ago

Read 2 more answers

An archaeologist graduate student found a leg bone of a large animal during the building of a new science building. The bone had

Vlad [161]

Answer : The time passed in years is $2.74\times 10^2\text{ years}$

Explanation :

Half-life of carbon-14 = 5730 years

First we have to calculate the rate constant, we use the formula :

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

$k=\frac{0.693}{5730\text{ years}}$

$k=1.21\times 10^{-4}\text{ years}^{-1}$

Now we have to calculate the time passed.

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

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

where,

k = rate constant = $1.21\times 10^{-4}\text{ years}^{-1}$

t = time passed by the sample = ?

a = initial amount of the reactant disintegrate = 15.3

a - x = amount left after decay process = 14.8

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

$t=\frac{2.303}{1.21\times 10^{-4}}\log\frac{15.3}{14.8}$

$t=274.64\text{ years}=2.74\times 10^2\text{ years}$

Therefore, the time passed in years is $2.74\times 10^2\text{ years}$

4 0

3 years ago

Why is haemoglobin a pure substance

dem82 [27]

<span>Haemoglobin is a pure substance because it contains only one type of atom. </span>

6 0

2 years ago

Often express in psi, pressure is the term for force per unit of

taurus [48]

Answer:

Surface area

Explanation:

psi = pound square inch

Often expres in psi, pressure s the term for force per unit of surface area.

8 0

1 year ago