All categories

3 years ago

Which scenarios are examples of physical changes? Check all that apply.

Chemistry

2 answers:

lawyer [7]3 years ago

8 0

Explanation:

Physical change is a change that does not affect the chemical composition of a substance but it changes the physical appearance like size or shape of the substance.

For example, crushing a can, melting of ice, breaking a glass etc represents the physical change.

Scenarios which represent examples of physical changes are as follows.

Silicon is cut into tiny pieces for computer chips.
Lead is melted to form pellets.
Liquid water freezes to form ice.

Alona [7]3 years ago

3 0

Answer:

Lead is melted to form pellets

Explanation:

You might be interested in

How many molecules of o2 are required to form 13.5 g of water vapor?

Viefleur [7K]

13.5g H2O = 13.5/(2+16) = 0.75 mol H2O

Since for every O2 you can form 2 H2O, 0.75/2 = 0.375 mol of O2 will be needed to form 0.75 mol of H2O.

Converting from moles to molecules:

0.375 mol * 6.022 * 10^23 = 2.26 * 10 ^23 molecules

3 0

3 years ago

Select the correct answer from each drop-down menu. To prepare a 2 M solution of potassium nitrate (KNO3), which quantities must

gayaneshka [121]

Molarity determines the molar concentration of the solute dissolved in the solution. Mass and volume should be measured for the estimation of the molarity.

<h3>What is molarity?</h3>

Molarity is the mass of the solute present in the litre of solution. It is also called molar concentration as it estimates the concentration of the compounds.

The unit of molarity is mol/L and can be given by the formula:

$\rm Molarity(M) = \rm \dfrac{ \text{Mass of solute}}{\text{Molar mass of solute}}\times \text{Volume of Solution in L}$

Therefore, for the formation of a 2M potassium nitrate solution, the volume of the solution and mass of the solute is required.

Learn more about mass and volume here:

brainly.com/question/13167189

4 0

3 years ago

The average potential energy of water molecules is greatest in

NemiM [27]

The cell is not going through a lot of pain but it was not really bad

4 0

3 years ago

If the statement is true, select True. If it is false, select False.

Marianna [84]

This statement is true

7 0

3 years ago

Consider the combustion of carbon monoxide (CO) in

Julli [10]

Answer:

3.60 mol CO₂

Explanation:

Balanced chemical reaction:

2CO + O₂ ⇒ 2CO₂

The molar ratio between CO₂ and CO is 1:1

2CO₂/2CO = CO₂/CO

Thus, the moles of CO₂ produced from 3.60 moles of CO is 3.60 moles:

(3.60 mol CO)(CO₂/CO) = 3.60 mol CO₂

6 0

4 years ago