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4 years ago

Is lead to liquid to pellets a physical change

Chemistry

1 answer:

jonny [76]4 years ago

5 0

Answer:

yes

Explanation:

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Carbon-14 is a radioactive isotope that decays according to first-order kinetics in a process that has a half-life of 5730 years

Sliva [168]

Answer : The time passed in years is $2.83\times 10^3\text{ years}$

Explanation :

Half-life = 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 = let initial amount of the reactant = X g

a - x = amount left after decay process = $71\% \times (x)=\frac{71}{100}\times (X)=0.71Xg$

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

$t=\frac{2.303}{1.21\times 10^{-4}}\log\frac{X}{0.71X}$

$t=2831.00\text{ years}=2.83\times 10^3\text{ years}$

Therefore, the time passed in years is $2.83\times 10^3\text{ years}$

8 0

3 years ago

When an atom of age in an atom of a bond together:

nata0808 [166]

Answer:

The two different atoms are able to combine their electrons to become stable.

hope this helps :)

8 0

3 years ago

Name four acids obtained from plants

olga55 [171]

Answer:

Formic acid H. COOH

Acetic acid CH3.COOH

Propionic acid CH3 . CH1 . COOH

Butyric acid CH3 . CH1 . CH1 . COOH

Explanation:

4 0

3 years ago

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What is neutron?<br>What is Atom?<br><br>

yawa3891 [41]

Answer:

A neutron is a subatomic particle with no charge and is found in the nucleus of an atom.

An atom is the smallest particle of an element that retains its identity in a chemical reaction.

Explanation:

hope this helps!! p.s. i really need brainliest :)

4 0

2 years ago

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Please answer this. Look at the picture for the questions, Thanks!

kenny6666 [7]

The water molecules are moving so slow that they end up sticking together to form a solid

4 0

3 years ago