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3 years ago

15

If a scientist wants to make molecules move slower, what should they do? A. decrease their kinetic energy B. Transfer energy out

of them C. Put them in a freezer D. All of the above

2 answers:

kvv77 [185]3 years ago

7 0

The answer is D all of the abound

SVEN [57.7K]3 years ago

3 0

The answer is D because it’s D

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The Earth only has a limited supply of fresh water; eventually, we will have to use ocean water. We will purify ocean water thro

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I don't learn chemistry yet but I see where you are right now... I think this will change in the near future because we will only have the ocean water to survive... So we purify the water... Because this will almost be all we have, we'll have no choice BUT to make money on this.... Sorry if it's wrong I don't learn chemistry yet

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4 years ago

The purpose of rationing during World War II was to ensure that *

mihalych1998 [28]

Answer:

During World War II, rationing was implemented to control the equal distribution of items in short supply. Although the primary goal of rationing was equal distribution, a secondary goal was to free valuable factory resources for war production.

Explanation:

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4 years ago

Read 2 more answers

Potassium hydrogen phosphate is used in the preparation of non-dairy powdered creamers. Calculate the molarity of a solution pre

aksik [14]

Answer:

D) 4.97M

Explanation:

firstly we will calculate the molar mass of K2HPO4.

K=39, H=1 , P=31, O=16

K2HPO4 = (39*2)+(1)+(31)+(16*4) =174g/mol

number of moles = mass / molar mass

mass of K2HPO4 =238g

number of moles = $\frac{238}{174}$ moles.

$\frac{238}{174}$ moles is contained in 275mL of solution.

The molarity of a solution is the number of moles of solute contained in 1000mL of solution.

if $\frac{238}{174}$ moles is contained i 275mL of solution

Then X will be contained in 1000 mL of solution

$x=\frac{\frac{238}{174}*1000}{275}$

x=4.9739moles

x ≈ 4.97moles

4.97moles is contained in 1000mL of solution.

The molarity of the solution is 4.97M

5 0

3 years ago

A solution is prepared by dissolving 10.0 g NaCl in 600 g of water. What is its molality? (Note: the molar masses are NaCl = 58.

xxMikexx [17]

Answer:

Option B. 0.285m NaCl

Explanation:

To find the molality, first let find the number of mole of NaCl in the solution. This is illustrated below

Molar Mass of NaCl = 58.5 g/mol

Mass of NaCl = 10g

Number of mole of NaCl = Mass of NaCl / molar Mass of NaCl

Number of mole of NaCl = 10/58.5 = 0.1709mol

Mass of water = 600g = 600/1000 = 0.6kg

Molality = mole of solute / mass of solvent

Molality = 0.1709mol/0.6kg

Molality = 0.285mol/Kg

3 0

4 years ago

what is the concentration of the NaCl solution that results when 0.15 0 L of 0.556-M solution is allowed to evaporate until the

photoshop1234 [79]

<u>Answer:</u> The concentration of evaporated solution is 0.794 M

<u>Explanation:</u>

To calculate the molarity of the diluted solution, we use the equation:

$M_1V_1=M_2V_2$

where,

$M_1\text{ and }V_1$ are the molarity and volume of the evaporated solution

$M_2\text{ and }V_2$ are the molarity and volume of initial solution

We are given:

$M_1=?M\\V_1=0.105L\\M_2=0.556M\\V_2=0.15L$

Putting values in above equation, we get:

$M_1\times 0.105=0.556\times 0.15\\\\M_1=0.794M$

Hence, the concentration of evaporated solution is 0.794 M

3 0

3 years ago