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Sunny_sXe [5.5K]
3 years ago
12

The amount of material left after two half-lives is one-half of the original amount. ____________________

Chemistry
2 answers:
Assoli18 [71]3 years ago
8 0
I think it is true because that seems like the right answer
choli [55]3 years ago
4 0

That statement is false. When an atom gains or loses electrons, the charged particle that results is called a molecule. The amount of material left after two half-lives is one-half of the original amount. Fission is the combining of two low-mass nuclei into one nucleus with a larger mass. I got that part from google for a more detailed response.

Hope this helps, if not, comment below please!!!

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When copper metal is added to nitric acid, the following reaction takes place
zlopas [31]

Answer:

The volume of NO₂ gas collected over water at 25.0 °C is 1.68 Liters.

Explanation:

Cu (s) + 4 HNO_3 (aq) \rightarrow Cu(NO_3)_2 (aq) + 2 H_2O (l) + 2 NO_2 (g)

Moles of copper = \frac{2.01 g}{63.55 g/mol}=0.03163 mol

According to reaction, 1 mol of copper gives 2 moles of nitrogen dioxide gas.

Then 0.03613 moles of copper will give:

\frac{2}{1}\times 0.03163 mol=0.06326 mol of nitrogen dioxide gas

Moles of nitrogen dioxide gas = n = 0.06326 mol

Pressure of the gas = P

P = Total pressure - vapor pressure of water

P = 726 mmHg - 23.8 mmHg = 702.2 mmHg

P = 0.924 atm (1 atm = 760 mmHg)

Temperature of the gas = T = 25.0°C =298.15 K

Volume of the gas = V

PV=nRT

V=\frac{0.06326 mol\times 0.0821 atm L/mol K\times 298.15 K}{0.924 atm}

V = 1.68 L

The volume of NO₂ gas collected over water at 25.0 °C is 1.68 Liters.

3 0
3 years ago
Which field of science studies the composition and structure of matter?
masha68 [24]
The answer is chemistry
6 0
3 years ago
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Two students performed the same experiment separately and each one of them recorded two readings of mass which are given below.
Lapatulllka [165]

Answer:

Hey weirdo what's up?

So you got a question huh?

Lemme answer

As said the correct reading is 3.0grams

And the option A has 3.01 and 2.99 which are very mush precise and accurate to 3.0 gram don't you think?

So the answer is

Option ii the result of students A is both precise and accurate

Loye ya

Peace out

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A researcher wants to test the solubility (property of being dissolved) of salt in water as the temperature of the water increas
aev [14]
Have about 5 beakers all with different temperatures of water. Put in a teaspoon of salt at a time and when it stops dissolving stop adding and record how much salt it took. It should be more salt as the temperature rises. The independent variable is the waters temperature. The dependent variable is how much salt is used. Make sure that there is the same amount of water in each beaker. Or else it won’t work.
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3 years ago
The structure of cyclopentane-1,2-diol​
Lady bird [3.3K]

Answer: five carbon atoms forms a ring. In adjacent two carbon atoms

An hydroxyl group (-OH) is attached. Molecular formula is

C5H8(OH)2

Explanation:

6 0
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