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Nonamiya [84]
3 years ago
9

Scientists Pam and Alejandro were discussing a liquid found in the science lab that was missing it's label. In classifying the u

nknown liquid, they first needed to determine if the liquid is a mixture or pure substance. How is a pure substance different from a mixture?
Question 11 options:


A.Mixtures cannot be separated by physical meansA pure substance is heterogeneous.


B.Pure substances cannot be separated by physical means.

C.mixture is made of one substance.

D. a pure substance is heterogeneous.
Chemistry
2 answers:
strojnjashka [21]3 years ago
6 0

Your answer for this would be A. Mixtures cannot be separated by physical meansA pure substance is heterogeneous.


Hope This Helps :)

elena-14-01-66 [18.8K]3 years ago
3 0

Answer is: B. Pure substances cannot be separated by physical means.

Pure substance is made of only one type of atom (element) or only one type of molecule (compound), mixtures and solutions are made from two or more types of pure substances.

Elements (for example copper, iron, sulfur) and compounds (water, sodium chloride) have definite and constant composition with distinct chemical properties.  

Pure substances can be separated chemically, not physically, that is difference between pure substances and mixtures.

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A solution of bleach has about 1.5 g of NaOCl dissolved in 220 mL of solution. What is the molarity?
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Answer:

0.091 mol/L

Explanation:

Molarity of a substance , is the number of moles present in a liter of solution .

M = n / V

M = molarity ( unit = mol / L or M )

V = volume of solution in liter ( unit = L ),  

n = moles of solute ( unit = mol ),  

Moles is denoted by given mass divided by the molecular mass ,

Hence ,

n = w / m

n = moles ,

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m = molecular mass .

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Since ,

1 mL = 1/1000L

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n = w / m

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