Question

Substances are classified as acidic, basic, or neutral. The pH scale can be used to classify a substance. Which feature suggests that a substance is basic?
a

The pH is 0.
b

The pH is 7.
c

The pH is less than 7.
d

The pH is greater than 7.


As a sample of water turns to ice,
a

new molecules are formed.
b

the mass of the sample is increased.
c

the arrangement of the molecules changes.
d

energy is absorbed by the molecules.

If you only wanted to increase the particle motion of a gas without increasing any of it's other properties, which would the most correct situation?
a

Keep the gas at a constant pressure and keep the temperature constant, but increase the volume of the gas
b

Keep the gas in a fixed container at constant pressure and increase the temperature
c

Keep the gas in a fixed container at constant pressure and decrease the temperature
d

Keep the gas at a constant volume and keep the temperature constant, but decrease the pressure of the gas

What is supersaturation?
a

Supersaturation occurs when a different solvent is added to a solvent, increasing how much can be dissolved
b

Supersaturation occurs when natural water dilutes a solvent that also dissolves the solute at the same time
c

Supersaturation occurs when a solvent's temperature is increased to increase the dissolving amount, then cooled to a normal temperature
d

Supersaturation requires the use of powered solute, to increase the saturation point beyond the normal maximum

Answer 1

The pH shows the degree of acidity or alkalinity of a substance. A substance whose pH is greater than 7 is basic. As molecules of water turn into ice, the  arrangement of the molecules changes. If my target is to increase the particle motion of a gas without increasing any of it's other properties, then i need to Keep the gas in a fixed container at constant pressure and increase the temperature. A supersaturated solution contains more solute than it can normally hold at a given temperature. Therefore, supersaturation requires the use of powered solute, to increase the saturation point beyond the normal maximum.

The pH scale ranges from 1 - 14 and is a suitable way of determining the extent of acidity or alkalinity of a solution. A solution whose pH ranges from 0 - 6.9 is acidic. A solution whose pH ranges from 8 -14 is basic. A pH of 7 indicates a neutral substance.

Temperature is defined as a measure of the average kinetic energy of the molecules of a body. Therefore, to increase the particle motion of a gas without increasing any of it's other properties, we need to keep the gas in a fixed container at constant pressure and increase the temperature.

The difference between solid, liquid and gaseous states of matter is the arrangement of the molecules. Solid molecules are more closely packed than liquid molecules and liquid molecules are more closely packed than gas molecules. Hence, as a sample of water turns to ice, the arrangement of the molecules changes.

Lastly, supersaturation refers to a situation where a solution contains excess solute at a given temperature. Thus, supersaturation requires the use of powered solute, to increase the saturation point beyond the normal maximum.

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