(20 of 25) The density of a substance is a value and does not ever change even a

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(20 of 25) The density of a substance is a value and does not ever change even at different temperatures. the same for all mixtures made of the same pure substances. changes based on the sample size. is a physical property of a substance and can be temperature dependent. Save Answer Skip Question I Am Finished/Submit for Grade Note: Clicking any button other than the Save Answer button will NOT save any changes to your answers! For questions or concerns regarding this online publication, please contact web support ? O Having troubles viewing something on the page? Make sure you have the correct plug-ins esc

Explanation / Answer

20)first option is incorrect density depend on temperature inversely.

second option is incorrect since for same substances with different mass and volume ,its density will be different.For example-: for pure water sample 1 has 10 gm in 10 ml,sample 2 has 10 gm in 20 ml.So,density in sample 1=1 gm/ml,in sample 2=0.5 gm/ml.

third option is incorrect since density not only changes with size(volume) but also with the mass of the sample.

fourth option is correct since it is na physical property of a substance and temperature dependent.

SO,ONLY FOURTH OPTION IS CORRECT

21)density of A>density of B

mass(A)/volume(A)>mass(B)/volume(B)

for option first and second,mass(A)=mass( B)

1/volume(A)>1/volume(B)

volume(A)<volume(B)

SO,b occupies more space than A for same mass of the two.

FIRST OPTION IS CORRECT.second option is incorrect.

now for third and fourth volume(A)=volume(B)

mass(A)>mass(B)

THerefore,both third and fourth option are incorrect.

SO,ONLY FIRST OPTION IS CORRECT.

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