CHEMISTRY HIGH SCHOOL

To form a solution, ________. A. substance must dissolve in another
B. a solid must dissolve in a liquid
C. the solvent must be water
D. a gas must dissolve in a liquid

Answers

Answer 1

Answer: To form a solution, a substance must dissolve in another. The correct answer will be A.

Answer 2

Answer:

Answer:

1.A

2.A

3.A

4.A

100% RIGHT

Explanation:

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What is the half-life of the substance as determined by the graph?

Answers

Answer:

6.25

Explanation:

Because 2.5 is half and idk know how to explain but yeah

Which is true about the dissolving process in water? Nonpolar solutes dissolve easily in water. Solute molecules surround water molecules. Molecules or ions of a solute spread throughout the water molecules. Water molecules are repelled by solute ions at the surface of the solute.

Answers

The simple principle for solute dissolution in a particular solvent is "like dissolves like". In the case of water, a solute will dissolve if it is polar. This is because water is a polar solvent. A polar substance is one which has particles that have a net charge on them. This net charge produces forces of attraction. When a polar solute is added to water, the water molecules are attracted to the solute particles and they attach to them. After attaching to the water molecules, the solute particles are dispersed throughout the water. Therefore, the answer is molecules or ions of a solute spread throughout the water molecules.

Answer:

C. Molecules or ions of a solute spread throughout the water molecules.

Explanation:

C. Molecules or ions of a solute spread throughout the water molecules.

What a non-renewable resource is, Give 2 examples of non-renewable resources.

Answers

Answer:

Non renewable resource is fossil fuels that cannot be replaced such as coal and oil

Explanation:

Answer: coal and natural gas

Explanation: because it takes a long time for them to form

How many moles in 28 grams of CO2

Answers

In the given question, in 28 grams of $\rm CO_2$ molecule 0.636 moles are present.

A mole is the amount of a substance which comprises exactly $6.022* 10^(23)$ 'elementary entities' of that substance.

To find the number of moles in 28 grams of $\rm CO_2$ , we first need to determine the molar mass of $\rm CO_2$ .

Molar mass of $\rm CO_2$ = 12.01 g/mol (carbon) + 2(16.00 g/mol) (oxygen)

= 44.01 g/mol

Now that we know the molar mass of $\rm CO_2$ , we can use the following formula to calculate the number of moles:

$\rm Number \ of\ moles = \frac {mass \ of \ sample\ (in \ grams) }{ molar\ mass}$

$\rm Number\ of\ moles = \frac {28 \ g }{44.01\ g/mol }$

= 0.636 mol

Therefore, there are 0.636 moles in 28 grams of $\rm CO_2$ .

Learn more about Mole here:

brainly.com/question/30892840

#SPJ6

That is approximately .63620 grams.

Explain the process on how the conditions for lightning to strike occurs?

Answers

"A cloud-to-ground lightning strike starts as a channel of negative charges makes its path towards the ground. This occurrence is known as a stepped leader. The stepped leader continues towards the ground in a series of steps that are each about 50 to 100 metres in length. This stepped leader can branch out in many directions. A lightning strike refers to as a lightning flash, is usually made up of more than one stroke of lightning. After the initial strongest stroke, subsequent weaker strokes can follow which usually (but not always) follow the same path of the initial stroke. "

if you had a sample of beryllium, would all the atoms be identical? what about a sample of lithium? explain your answers.