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Rainbow [258]
3 years ago
13

Which option is an example of a physical property?

Chemistry
2 answers:
Setler79 [48]3 years ago
5 0
Freezing point. because toxicity is a chemical property as well as pH  and flammability is dependent on the items chemical composition  <span />
Tasya [4]3 years ago
5 0

Answer: freezing point

Explanation:

Chemical property is defined as the property of a substance which is observed during a reaction where the chemical composition identity of the substance gets changed.

Physical property is defined as the property which can be measured and whose value describes the state of physical system. For Example: State, density etc.

Flammability is a chemical property as it alters the chemical composition of substance.

pH is a chemical property as it alters the chemical composition of substance.

Toxicity is a chemical property as it alters the chemical composition of substance.

Freezing point is a physical property as it deals only with phase changes.

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How many molecules of CBr4 are in 250 grams of CBr4
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Answer:- 4.54*10^2^3 molecules.

Solution:- The grams of tetrabromomethane are given and it asks to calculate the number of molecules.

It is a two step unit conversion problem. In the first step, grams are converted to moles on dividing the grams by molar mass.

In second step, the moles are converted to molecules on multiplying by Avogadro number.

Molar mass of CBr_4  = 12+4(79.9)  = 331.6 g per mol

let's make the set up using dimensional analysis:

250g(\frac{1mol}{331.6g})(\frac{6.022*10^2^3molecules}{1mol})

= 4.54*10^2^3 molecules

So, there will be 4.54*10^2^3 molecules in 250 grams of CBr_4 .


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