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sleet_krkn [62]
3 years ago
10

What properties do all basses have?

Chemistry
1 answer:
vekshin13 years ago
4 0
They all have to be measured
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A fossil is found to have a 14 C 14C level of 70.0 70.0 % compared to living organisms. How old is the fossil?
natulia [17]

Answer:

The age of the fossil be 2.1987\times 10^{4} years.

Explanation:

Formula used :

N=N_o\times e^{-\lambda t}\\\\\lambda =\frac{0.693}{t_{\frac{1}{2}}}

where,

N_o = initial mass of isotope  C-14 = x

N = mass of the parent isotope left after the time, (t)  = 70.0% of x=0.07x

t_{\frac{1}{2}} = half life of the isotope  C-14 = 5730 years

\lambda = rate constant

Let the age of the fossil be t.

Now put all the given values in this formula, we get  t :

0.07x=x\times e^{-(\frac{0.693}{5730 years})\times t}

t=2.1987\times 10^{4} years

The age of the fossil be 2.1987\times 10^{4} years.

8 0
3 years ago
Which statement is true?
Arisa [49]

Answer:

C

In an exothermic reeaction, the energy of products is less than the energy of reactants.

Explanation:

6 0
3 years ago
Which option supports a theory and allows it to remain the same
mr_godi [17]

Answer:

D.

Explanation:

That would be the last option.

Repeated similar experimental outcomes are confirmation of the theory.

4 0
3 years ago
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When and enzyme lowers the activation energy of a reaction, what happens?
Nostrana [21]

Answer:

Enzymes lower the activation energy of a reaction by binding one of the reactants, called a substrate, and holding it in a way that lowers the activation energy.

Explanation:

5 0
3 years ago
Molar mass of calcium sulfate
Nonamiya [84]

Answer:

The molar mass of calcium sulfate is 136.14 g/mole. Calcium has a molar mass of 40.08 g/mole. Sulfur has a molar mass of 32.06 g/mole.

7 0
3 years ago
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