2 What is an alloy? A A mixture of two or more metals B A pure metal C A non-metal D A chemical compound
4 What is the process of separating a mixture by evaporating the solvent called? A Crystallization B Distillation C Filtration D Chromatography
8 What is the main difference between a mixture and a pure substance? A Mixtures have variable composition; pure substances have fixed composition B Mixtures are always solid; pure substances are always liquid C Mixtures cannot be separated; pure substances can D Mixtures are always homogeneous
9 What is the process of separating a mixture by pouring off the liquid after settling called? A Filtration B Decantation C Distillation D Evaporation
10 What is the term for the scattering of light by colloids? A Tyndall effect B Brownian motion C Diffusion D Osmosis
11 Which of the following is an example of a solution? A Muddy water B Salt solution C Orange juice with pulp D Smoke
12 Which of the following can be separated by magnetic separation? A Sand and water B Iron and sulfur C Salt and sugar D Oil and water
13 What is a suspension? A A homogeneous mixture B A mixture where solid particles settle on standing C A mixture where particles do not settle D A pure substance
15 Which of the following is an example of a solid-solid mixture? A Air B Salt and water C Sand and sugar D Milk
16 What is the term for a mixture where one substance is dispersed in another? A Solution B Colloid C Suspension D Compound
18 What is the process of separating a liquid from a solution by boiling and condensing called? A Filtration B Distillation C Evaporation D Decantation
20 What is the method of separating insoluble solids from liquids called? A Filtration B Distillation C Evaporation D Chromatography
21 What is a heterogeneous mixture? A A mixture with uniform composition B A mixture with non-uniform composition C A pure substance D A chemical compound
25 What is the process of separating a mixture by spinning it at high speed called? A Filtration B Centrifugation C Evaporation D Distillation