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3 years ago

Place a check next to each elementary reaction

Chemistry

1 answer:

Anna007 [38]3 years ago

6 0

Answer: its A and C

Explanation:

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Geologists use the decay of potassium-40 in volcanic rocks to determine their age. Potassium-40 has a half-life of 1.26 109 year

melomori [17]

Answer:

$m_{o} \approx 3.247\times 10^{-7}\,g$

Explanation:

The mass of radioactive isotope at a certain time is given by the following expression:

$m(t) = m_{o}\cdot e^{-\frac{t}{\tau} }$

Time constant can be calculed in terms of half-life:

$\tau = \frac{t_{1/2}}{\ln 2}$

$\tau = \frac{1.26\times 10^{9}\,yr}{\ln 2}$

$\tau = 1.818\times 10^{9}\,yr$

The initial mass is:

$m_{o} = \frac{2.73\times 10^{-7}\,g}{e^{-\frac{3.15\times 10^{8}\,yr}{1.818\times 10^{9}\,yr} }}$

$m_{o} \approx 3.247\times 10^{-7}\,g$

8 0

3 years ago

512,420,000 in scientific notation

klemol [59]

The answer is 5.1242x10^8

6 0

3 years ago

Consider the reaction of cesium metal with gaseous fluorine to produce cesium fluoride. How many cesium ions are on the

ZanzabumX [31]

There is only one cesium ion on reactant (left hand side) of the reaction equation.

The formation of cesium fluoride involves the combination of cesium ion and fluoride ion. Cesium fluoride is an ionic compound since it is composed of ions.

The reaction between cesium ions and fluoride ions to form cesium fluoride occurs as follows;

Cs^+ + F^- ------> CsF

So, there is only one cesium ion on reactant (left hand side) of the reaction equation.

Learn more: brainly.com/question/1781817

5 0

2 years ago

What are the 3 parts of a nucleotide

lara [203]

The 3 parts are

1) A five carbon ribose sugar

2) A Phosphate molecule

3) The four nitrogenous bases

I hope that's help !

5 0

4 years ago

Read 2 more answers

Assign an oxidation number to each element in the following species. H2O

VikaD [51]

Answer:

the oxidation number of hydrogen is +2, while oxygen is -2

5 0

3 years ago