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3 years ago

The atomic mass of copper - is 62.930 amu

Chemistry

1 answer:

Leona [35]3 years ago

3 0

Nope the atomic mass of copper roughly 63,546 atomic mass units

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WHICH SIGN CAN SAY THAT A PHYSICAL CHANGE HAS TAKEN PLACE

Pie

Answer:

4. all of the above

Explanation:

that my answer hehehe..

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3 years ago

What are some ways we can improve the chemical reactions in batteries to increase their efficiency?

Ainat [17]

Answer:

Charging Level The cycle life of Lithium batteries can be increased by reducing the charging cut off voltage.

Explanation:

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3 years ago

If the half life of a radioactive isotope is 1 day, then how much of the original isotope remains at the end of two days?

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25%

Explanation:

In a half life of a radioactive isotope is 1 day,it means it loses its half mass each day

We a formula for N half life

$\sf { \frac{1}{2} }^{n}$

where n is the number of days

Here the isotope is kept for 2 days

so it's left over mass will be

$\sf { (\frac{1}{2}) }^{2} \\ \\ \\ \frac{1}{2} \times \frac{1}{2} \\ \\ \sf \frac{1}{4}$

It's left over mass 1/4th of the original mass

Now, we need to find it's percentage by multiplying with 100

$\sf \frac{1}{4} \times 100 \%\\ \\ \sf \cancel\frac{100}{4} \% \\ \\ \sf 25\%$

So 25% mass will be left after 2 day of half life radioactive isotope.

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2 years ago

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Examples of physical and chemical weathering

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