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3 years ago

Is this right, i dont know how to do this?

Chemistry

2 answers:

aliina [53]3 years ago

3 0

Your answer, I believe, is correct. I'm no expert at chemistry tho.

Tyler Dewitt has some great YouTube vids on chem that have saved my butt on multiple occasions. you should check them out. very helpful

77julia77 [94]3 years ago

3 0

Yes those answers are correct !

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plz answer 7 & 8 because I dont get the answer... oh and you need to use the picture for the questions 7 & 8 thanks

djyliett [7]

7. An exothermic reaction
8. The bonds are forming

4 0

3 years ago

Convert 565,900 seconds into days

Andreas93 [3]

There are 60 seconds in one minute

565900 / 60 = 9431.667 minutes in 565,900 seconds

There are 60 minutes in an hour

9431.667 minutes / 60 = 157.9144 hours in 565900 seconds

There are 24 hours in 1 day

157.9144 hours / 24 hours = 6.5498 days.

4 0

3 years ago

The half-life of a radioactive isotope is the amount of time it takes for a quantity of that isotope to decay to one half of its

Sedaia [141]

Radio active decay reactions follow first order rate kinetics.

a) The half life and decay constant for radio active decay reactions are related by the equation:

$t_{\frac{1}{2}} =$ $\frac{ln 2}{k}$

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

Where k is the decay constant

b) Finding out the decay constant for the decay of C-14 isotope:

$Decay constant (k) = \frac{0.693}{t_{\frac{1}{2}}}$

$k = \frac{0.693}{5230 years}$

$k = 1.325 * 10^{-4} yr^{-1}$

c) Finding the age of the sample :

35 % of the radiocarbon is present currently.

The first order rate equation is,

$[A] = [A_{0}]e^{-kt}$

$\frac{[A]}{[A_{0}]} = e^{-kt}$

$\frac{35}{100} = e^{-(1.325 *10^{-4})t}$

$ln(0.35) = -(1.325 *10^{-4})(t)$

t = 7923 years

Therefore, age of the sample is 7923 years.

3 0

3 years ago

The formulas for elements never contain a subscript true or not true

Andru [333]

The answer should be false. Elements contain only one atom.

7 0

3 years ago

The "hardness" of water describes _____.

krok68 [10]

Your answer is C. its level of dissolved minerals ~A

6 0

3 years ago

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