Which of the following is NOT a solution? a) brass: an alloy b) air: contains ga

Question

Which of the following is NOT a solution? a) brass: an alloy b) air: contains gases whose percentages vary c) sucrose: a compound containing carbon, hydrogen and oxygen d) dental fillings: an amalgam e) 80 proof vodka: 40% alcohol The solute portion of a solution is: a) always the component in the greatest amount b) the dissolving substance c) the same as the solvent d) becomes part of the structure of the solvent e) always a solid In which of the following mixtures is water the solvent? a) a liquid heterogeneous mixture of oil floating on water b. a liquid homogeneous mixture of salt dissolved in water c) a gaseous homogeneous mixture of water vapor in the air d) a liquid homogeneous mixture that is 70% alcohol with 30%, water e) all of the above Which of the following statements is correct? a) Pepsi is supersaturated with carbon dioxide b) If a crystal of solute dissolves in a solution, the solution was c) The solubility of solids in water generally increases as the temperature raised d) Soluble salts are electrolytes e) all of the above are correct A nitric acid solution that is 17%(m/m) HNO_3 contains a) 17 grams of HNO_3 in 100 g of solution b) 17 moles of HNO_3 c) 17 grams of HNO_3 for every 30 grams of solution d) 17 grams of HNO_3 for every 70 grams of solution e) none of the above

Explanation / Answer

Q58

A solution is any mixture, it can be homogeneous and heterogeneous, it must have at least 2 pure substances.

From the list:

brass: an aloy --> this is a solution, since it has different metals ( pure substances ) in a mixture

air --> it is a solution, since it has different gases ( nitrogen, oxygen, etc. which are pure substance in a mix

Sucrose --> this is NOT a solution, it is a pure substance, actually a molecule/compound

dental fillings -> amalgam -> this is a solution of at least 2 metals, therefore, a mixutre

vodka --> ethanol and water are the main components, therefore, this must be a solution

the answer is SUCROSE, .e. C

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