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2 years ago

PLEASE HELP?? :| AS SOON AS POSSIBLE!!

Chemistry

2 answers:

frutty [35]2 years ago

6 0

B hope this helps, it sounds right

Kitty [74]2 years ago

5 0

Oceans cover most of the planets surface and contain nearly all its water.

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solniwko [45]

Answer:

a) 2

b) 3

c) 5

d) 6

Explanation:

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2 years ago

A wooden artifact from a Chinese temple has a 14C activity of 42.8 counts per minute as compared with an activity of 58.2 counts

Arlecino [84]

Answer : The age of the artifact is, $2.54\times 10^3\text{ years}$

Explanation :

Half-life = 5715 years

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

$k=\frac{0.693}{5715\text{ years}}$

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

Now we have to calculate the time taken to decay.

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

t = time taken by sample = ?

a = initial activity of the reactant = 58.2 counts per minute

a - x = activity left after decay process = 42.8 counts per minute

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

$t=\frac{2.303}{1.21\times 10^{-4}}\log\frac{58.2}{42.8}$

$t=2540.5\text{ years}=2.54\times 10^3\text{ years}$

Therefore, the age of the artifact is, $2.54\times 10^3\text{ years}$

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3 years ago

A student wants to increase the rate at which his powdered drink dissolves in water.

Neporo4naja [7]

Answer:

A Increase the temperature of water

Explanation:

You can look on sciencing.com for expanation

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2 years ago

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What type of bond would be found between

LenaWriter [7]

Answer:

covalent bond
polar covalent bond
ionic bond
metallic bond

Explanation:

<h2>hope it helps you </h2><h2>.</h2><h2>.</h2><h2>.</h2><h2>.</h2><h2>.</h2><h2>.</h2><h2>Thank uu</h2>

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3 years ago

Gravity that exists between two objects exists as a small force unless:

Vikentia [17]

Your answer is A I know this stuff

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