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3 years ago

What particles in an atom are involved in nuclear reactions

Chemistry

1 answer:

VikaD [51]3 years ago

8 0

Answer:

Explanation:

Electrons are the negatively charged particles of an atom that are involved in chemical reactions. They are located outside the nucleus of an atom

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Algae and other phytoplankton are the major producers of the earth's:

vredina [299]

Answer:

oxygen

Explanation:

pls mark me brainliest right

4 0

2 years ago

PLEASE HELP!

Valentin [98]

Answer:

Then make it yourself? We don't know the lab.

Explanation:

5 0

2 years ago

A helium-filled weather balloon has a volume of 793 L at 16.9°C and 759 mmHg. It is released and rises to an altitude of 4.05 km

mariarad [96]

<h3>Answer:</h3>

1082.96 L

<h3>Explanation:</h3>

We are given;

Initial volume of helium gas, V1 = 793 L
Initial temperature, T1 = 16.9°C

But, K = °C + 273.15

Thus, initial temperature, T1 is 290.05 K
Initial pressure, P1 = 759 mmHg
New pressure at 4.05 km, P2 = 537 mmHg
New temperature at 4.05 km, T2 = 7.1 °C

= 280.25 K

Assuming we are required to calculate the new volume at the height of 4.05 km

We are going to use the combined gas law.

According to the combined gas law;

$\frac{P1V1}{T1}=\frac{P2V2}{T2}$

Rearranging the formula;

$V2=\frac{P1V1T2}{P2T1}$

$V2=\frac{(759mmHg)(793L)(280.25K)}{(537mmHg)(290.05K)}$

$V2=1082.96L$

Therefore, the new volume of the balloon at the height of 4.05 km is 1082.96 L

6 0

3 years ago

How do you find a mole (i need an example) i hate chem pls help

galben [10]

Answer:

I'm pretty sure its just the mass of the sample divided by the molar mass

for example if I had like 7g of carbon and wanted to find the moles, I would divide the mass I have (7g) by the molar mass (the atomic mass value on your periodic table, in this case for carbon it would be 14g)

moles = $\frac{mass}{molarmass} = \frac{7}{14} = 0.5\ moles$

Hope this helped

6 0

2 years ago

Calculate the mass of a solute in a 10% salt solution if the mass is 350 grams.

Lyrx [107]

<u>Answer:</u> The mass of a solute is 35 grams

<u>Explanation:</u>

To calculate the mass percentage of solute, we use the equation:

$\text{Mass percent of solute}=\frac{\text{Mass of solute}}{\text{Mass of solution}}\times 100$

Mass percent of solute = 10 %

Mass of solution = 350 g

Putting values in above equation, we get:

$10=\frac{\text{Mass of solute}}{350g}\times 100\\\\\text{Mass of solute}=\frac{10\times 350}{100}=35g$

Hence, the mass of a solute is 35 grams

7 0

3 years ago