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3 years ago

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True or false? To prepare 20.0 mL of 2.00 M solution of hydrochloric acid from a 10.0 M stock solution, you should take 4.00 mL

of the stock solution and add 20.0 mL of water.

1 answer:

Aleksandr-060686 [28]3 years ago

6 0

Sorry I don’t know but o have to answer for pionts

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name a household substance that could lower the pH of water leaving your home? increase the pH of water leaging your home? and w

Lady_Fox [76]

Bleach would increase the pH because Bleach is a basic substance with a pH of about 12

Soda would lower the pH because the pH of sodas is somewhere around 2.5 (this is for coke, other sodas are a bit different)

8 0

3 years ago

Identify the true statements about surface tension. Molecules along the surface of a liquid behave differently than those in the

Alexxandr [17]

Answer:

Molecules along the surface of a liquid behave differently than those in the bulk liquid.

Cohesive forces attract the molecules of the liquid to one another.

Water forming a droplet as it falls from a faucet is a primary example of surface tension.

Explanation:

Surface tension is the force that stretches the liquid surface. This force acts normal to the surface. It is the downward force that acts on the surface of the liquids which is due to the cohesive forces of the liquids.

The water molecules are bonded by a strong hydrogen bond force which is between hydrogen atom and the electronegative oxygen atom. At the surface the water molecules are attracted strongly by other water molecules which lies below the surface and are stretched at the surface. Thus the water molecules at the surface acts differently than in the bulk liquid.

Mercury have a strong cohesive force than the water and have a higher surface tension force than the water.

Surface water acquires minimum surface area, hence acquiring spherical shape of water.

4 0

3 years ago

A metallurgical firm needs to dispose 2.77 of gallons of waste sulfuric acid whose concentration has been determined to be 2.10

Alchen [17]

Answer:

It will cost 1.9$ to neutralize the waste sulfuric acid

Explanation:

<u>Step 1:</u> The neutralization reaction

H2SO4(aq) + Ca(OH)2 (s) → CaSO4(s) + 2H2O

<u>Step 2:</u> Calculate the molar mass of Ca(OH)2

Molar mass of Ca = 40.08 g/mole

Molar mass of O = 16 g/mole

Molar mass of H = 1.01 g/mole

Molar mass of Ca(OH)2 = 40.08 + 2*16 + 2*1.01 =74.1 g/mole

<u>Step 3:</u> Convert gallons to liters

2.77 gallons of H2SO4 = 10.48559 Liters H2SO4

<u>Step 4:</u> Calculate number of moles of H2SO4

Molarity = moles / liters

2.10 M = moles / 10.48559L

number of moles = 2.10 * 10.48559 =22.02 moles

<u>Step 5:</u> Calculate the number of moles of Ca(OH)2

H2SO4(aq) + Ca(OH)2 (s) → CaSO4(s) + 2H2O

For 1 mole of H2SO4 consumed we need 1 mole of Ca(OH)2

This means we need 22.02 moles of Ca(OH)2

<u>Step 6:</u> Calculate mass of Ca(OH)2

mass of Ca(OH)2 =number of moles * Molar mass of Ca(OH)2

mass of Ca(OH)2 = 22.02 moles * 74.1 g/moles = 1631.682 grams

<u>Step 7:</u> Convert grams to pounds

1631.682 grams/ 453.592 = 3.5972 pounds

<u>Step 8:</u> Calculate the cost

price Price per pound = 0.53$

Price for 3.5972 pounds = 0.53 * 3.5972 = 1.906516 ≈1.9$

It will cost 1.9$ to neutralize the waste sulfuric acid

3 0

3 years ago

active transport requires __ and __ in order to function correctly. a) nucleic acids, membrane proteins b) energy, membrane prot

Anna [14]

B. Energy and membrane proteins, the energy is to give the extra push if a molecule is moving against the gradient and the membrane protein is the passage from in or outside the cell

3 0

3 years ago

If there are 16 values in a data set in order from smallest to largest, what is the median of the data set?

luda_lava [24]

C. The mean of the 8th and 9th values

Explanation:

If there are 16 values in a data set in order from the smallest to the largest, the median is the mean of the 8th and 9th values in the sequence.

The median is the middle term in a sequence.

To find the median:

Arrange the numbers from the lowest to the highest;

if the numbers are even in order, the median is the mean of the middle numbers. We will have two middle numbers

For odd order, we will have just one number.

learn more:

Average brainly.com/question/11488662

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8 0

3 years ago