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Charra [1.4K]
2 years ago
11

How many grams of copper

Chemistry
1 answer:
iren [92.7K]2 years ago
7 0
  • <u>The</u><u> </u><u>mas</u><u> </u><u>of copper</u><u> </u><u>is</u><u> </u><u>217</u><u>.</u><u>3</u><u> </u><u>grams</u><u>.</u>
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A radioactive isotope, 14C decays to become 14N. After a time period of about 6,000 years, only about 12.5% of an original sampl
satela [25.4K]

Answer:

2000 years

Explanation:

A radioactive molecule will continuously decay and turn into another molecule. This nature of the radioactive molecule makes them can be used to estimate the age of an object. Half-life is the unit of time needed for radioactive molecules to decay to half of its mass. The formula for the mass remaining will be:

N(t)= N_{0} (\frac{1}{2})^{\frac{t}{t_{1/2} } }

Where

N(t)= number of the molecule remains

N0= number of molecule initially

t= time elapsed

t1/2= half time

We have all variable besides the half time, the calculation will be:

N(t)= N_{0} (\frac{1}{2})^{\frac{t}{t_{1/2} } }

0.125= 1 (\frac{1}{2})^{\frac{6000}{t_{1/2} } }

(\frac{1}{8})= (\frac{1}{2})^{\frac{6000}{t_{1/2} } }

(\frac{1}{2})^3= (\frac{1}{2})^{\frac{6000}{t_{1/2} } }

3= 6000/ (t1/2)

t1/2= 6000/3= 2000

The half-life is 2000 years

8 0
4 years ago
Which statement best describes chemical properties of matter? Chemical properties, such as density, must be observed when a subs
alisha [4.7K]
Chemical properties of matter can only be observed and measured by performing a chemical change.
- Density and boiling are not chemical changes.
- This leaves reactivity and combustion. Reactivity does not need to be observed at STP so the statement is wrong.

Combustion is the best answer. 

6 0
4 years ago
Read 2 more answers
What would happen to life if earth were in a different location within the solar system
chubhunter [2.5K]
Closer=Burn
Farther=Freeze
We are the perfect distance away from the sun for it to sustain life.
3 0
4 years ago
The concentration of hydroxide ions is less than the concentration of hydronium ions for acidic solutions. True False
wolverine [178]

Answer:

True

Explanation:

It's true because the pH is a measure of how basic or acid a solution is. In an acidic medium, the pH scales goes from 0 to 7. While in a basic medium goes from 7 to 14. The lower the pH value of the most acid the solution is.

1. The expression pH = -log(molar concentration of hydronium) allow to calculate the pH of a solution.

2. On the other hand, the expression pOH = -log(molar concentration of hydroxide) allow to determine the pOH of a solution.

The values of pH and pOH always obey the following expression:

pH + pOH = 14

Thus if for instance the pH becomes smaller the pOH must become bigger in order to fulfill the equation. Which means that the concentration of hydronium ions is greater than the hydroxide concentration.

For example, in an acidic medium:

if pH= 3, pOH= 11

In this case the molar concentration of hydronium is 0,001M. And the molar concentration of hydroxide ions is just 0,00000000001M.

4 0
3 years ago
Read 2 more answers
Do the same volumes of H2O and H2SO4 have the same number of molecules?
Romashka [77]
No, they do not. Hope I helped! :)
5 0
3 years ago
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