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3 years ago

How is chemical change different from a physical change?

Chemistry

1 answer:

natka813 [3]3 years ago

5 0

A physical change changes the form of the matter, but does not change the substance itself.

A chemical change affects the substance and turns into a different substance.

Ex:

Physical change: Water freezes- its changes form, but it is still water

Chemical change: Wood burns- it is changing its makeup from wood to ash and various gases. You cant identify it as wood anymore.

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Millimeters, centimeters, meters, kilometers, Inches,<br> feet, and miles are all examples of

siniylev [52]

Answer:

Distance, some kind of distance or length.

Explanation:

4 0

2 years ago

Can anyone here help me with chemistry

Kay [80]

The answer is 20g N2

5 0

2 years ago

Why doesn’t the KHP concentration have to be exactly 0.100M? Explain using complete sentences.

ollegr [7]

Answer:

The answer is in the explanation.

Explanation:

The KHP is an acid used as standard in titrations to find concentration of bases as NaOH.

The reaction that explain this use is:

KHP + NaOH → KNaP + H2O

<em>where 1 mole of KHP reacts per mole of NaOH</em>

That means, at equivalence point of a titration in which titrant is NaOH, the moles of KHP = Moles of NaOH added

With the moles of KHP = Moles of NaOH and the volume used by titrant we can find the molar concentration of NaOH.

The moles of KHP are obtained from the volume and the concentration as follows:

Volume(L)*Concentration (Molarity,M) = moles of KHP

If the concentration is more or less than 0.100M, the moles will be higher or lower. For that reason, we need to know the concentration of KHP but is not necessary to be 0.100M.

8 0

2 years ago

Select the answer which shows the correct order, slowest to fastest, of the relative rate of diffusion of the gases.

IrinaK [193]

Diffusion is the process of a substance spreading out to evenly fill its container or environment. Rate of diffusion of a gas is inversely proportional to the molar mass of the gas.

$Rate of diffusion \propto \frac{1}{Molar mass}$

Lighter(lower) the molar mass of the gas , faster will be its rate of diffusion and heavier (higher) the molar mass of the gas , slower will be its rate of diffusion.

We have to arrange the given gases from slowest rate of diffusion to fastest rate of diffusion that means we need to arrange gases from higher molar mass to lower molar mass.

Molar mass of given gases are :

Cl = 35.5 g/mol

Xe = 131.29 g/mol

He = 4.00 g/mol

N = 14.00 g/mol

So correct order for slowest rate of diffusion (highest molar mass) to fastest rate of diffusion (lowest molar mass) is :

Xe , Cl , N , He

Xe having the highest molar mass will have the slowest rate of diffusion and He with lowest molar mass will have the fastest rate of diffusion, so option 'c' is correct.

Note : Slowest rate of diffusion = High Molar Mass

Fastest rate of diffusion = Low Molar Mass

7 0

3 years ago

What is the name for NICO3•4H2O

Harman [31]

Thc
hope it helps
....

8 0

3 years ago

Read 2 more answers