Which of the following does not have a uniform composition throughout? A) Compou

Question

Which of the following does not have a uniform composition throughout? A) Compound B) Homogeneous mixture C) Heterogeneous mixture D) Solvent E) Element The mass of a sample is 550 milligrams. Which of the following expresses that mass in kilograms? A) 5.5 times 10^5 kg B) 5.5 times 10^-4 kg C) 5.5 times 10^-1 kg D) 5.5 times 10^8 E) 5.5 times 10^-6 kg What is the volume of a container that contains 14.3 g of a substance having a density of 0.988 g/cm^3? A) 691 cm^3 B) 14.1 cm^3 C) 14.5 cm^3 D) 141 cm^3 E) 0.0691 cm^3 How many neutrons are there in an atom of lead whose mass number is 208? A) 126 B) 82 C) 290 D) 208 E) none of them

Explanation / Answer

Q1.

compound --> it does has a uniform composition

homogeneous --> as thename implies, homo means SAME composition

heterogeneous --> this is not uniform, hetero means at least two different phases/composiitons

solvent --> 1 phase, therefore unifrom

elements --> very unifrom

Q".

mass of 550 mg

1 mg = 10^-6 kg

so

550*10^-6 = 0.00055 --> 5.5*10^-4 kg

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