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2 years ago

Explain why a nuclear chain reaction is self-sustaining.

Chemistry

1 answer:

skelet666 [1.2K]2 years ago

6 0

answer is written in word file attached below

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Why do we have rain........................

VladimirAG [237]

Answer:

to watered our source of food

the "PLANTS & TREES"

6 0

2 years ago

Calculate the concentration of A bottle of wine contains 12.9% ethanol by volume. The density of ethanol (CH3OH) is 0.789 g/cm e

Delicious77 [7]

Answer:

The mass percentage of the solution is 10.46%.

The molality of the solution is 2.5403 mol/kg.

Explanation:

A bottle of wine contains 12.9% ethanol by volume.

This means that in 100 mL of solution 12.9 L of alcohol is present.

Volume of alcohol = v = 12.9 L

Mass of the ethanol = m

Density of the ethanol ,d= $0.789 g/cm^3=0.789 g/mL$

$1 cm^3=1 mL$

$m=d\times v=0.798 g/ml\times 12.9 mL = 10.1781 g$

Mass of water = M

Volume of water ,V= 100 mL - 12.9 mL = 87.1 mL

Density of water = D=1.00 g/mL

$M=D\times V=1.00 g/ml\times 87.1 mL =87.1 g$

Mass percent

$(w/w)\%=\frac{m}{m+M}\times 100$

$\frac{10.1781 g}{10.1781 g+87.1 g}\times 100=10.46\%$

Molality :

$m=\frac{m}{\text{molar mass of ethanol}\times M(kg)}$

M = 87.1 g = 0.0871 kg (1 kg =1000 g)

$=\frac{10.1781 g}{46 g/mol\times 0.0871 kg}$

$m=2.5403 mol/kg$

4 0

3 years ago

Does anyone know why electron affinity increases as going upward in the periodic table

kobusy [5.1K]

Answer:

Electron affinity increases upward for the groups and from left to right across periods of a periodic table because the electrons added to energy levels become closer to the nucleus, thus a stronger attraction between the nucleus and its electrons.

6 0

2 years ago

Solid foods digest faster than liquids.

Alexeev081 [22]

The answer to this question would be: false

Solid foods have a smaller surface that can be digested by enzyme compared to the liquids food. Liquid food like milk can easily be digested as the substrate spread in the solution to the enzyme can bind freely to the substrate. In solid food, the area that can be digested would be only the outer part of the food. That is why organism have teeth so the food can be cut into smaller pieces, increasing the surface area that can be digested.

3 0

3 years ago

Read 2 more answers

A. 165 lbs = ?? g<br> b. 12.01 cm = ?? m

tankabanditka [31]

Answer:

Hey there! :)

Explanation:

Answers;

165lbs = 74842.74

12.01cm = 0.1201

………………….……………………………………

(Answers will be explained)

~So first let’s do question ‘A’

A. 165 lbs=?? g

~We have to use the formula.

Grams=Pounds X 453.59237

(Note: 1 lb = 453.59237)

~With that being said, we can see that the pounds in 165. So we have to multiply using the formula.

~165 X 453.59237

⇒ Equals to 74842.74

So question ‘A’ is 74842.74

==================================================

~Okay now let’s do question ‘B’

B. 12.01 = ?? m

~Let’s first see what the formula is.

~Meters = Centimeter * 0.01

Or...

~Meter = Centimeter / 100

(Note: 1 m = 100 cm)

~Okay now let’s use the formula to find the answer.

(We use the formula)

12.01 / 100

⇒ Equals to 0.1201

~Hope this helps!~

^^Good luck!^^

~Have a nice day! :P

~If you have any questions about the steps, than ask for help! I would be glad to help with anything you don’t understand! :)

^-^ Also if you need help with other questions, I might be free to answer them too!

8 0

3 years ago