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  1. Problems
  2. /Mixtures and Solutions

Mixtures and Solutions

Chemistry
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34 problems
Type:
1.
At one temperature, a kelvin thermometer and a Fahrenheit thermometer show the same number. New
High School (11–12) · Measurement, Units and Significant Figures, Elements, Compounds and ChangesStemPy LabStemPy Lab
Hard
2.
A thermometer shows a fever of 39.4 °C. What is this temperature in kelvin and in degrees… New
High School (11–12) · Measurement, Units and Significant Figures, Elements, Compounds and ChangesStemPy LabStemPy Lab
Easy
3.
A ring has a mass of 10.5 g. Nikhil lowers it into a measuring cylinder, and the water level rises… New
High School (11–12) · Measurement, Units and Significant Figures, Elements, Compounds and ChangesStemPy LabStemPy Lab
Medium
4.
Shreya sorts six things from her kitchen: table salt, a steel spoon, oxygen in a small cylinder… New
High School (11–12) · Measurement, Units and Significant Figures, Elements, Compounds and ChangesStemPy LabStemPy Lab
Easy
5.
Three samples of a white solid are analysed.
High School (9–10), General · Elements, Compounds and ChangesStemPy LabStemPy Lab
Hard
6.
Iron filings and sulphur powder are mixed in a dish.
High School (9–10), General · Elements, Compounds and ChangesStemPy LabStemPy Lab
Medium
7.
Iron and sulphur join to make iron sulphide in the ratio 7 : 4 by mass.
High School (9–10), General · Elements, Compounds and ChangesStemPy LabStemPy Lab
Hard
8.
In water, hydrogen and oxygen are in the ratio 1 : 8 by mass.
High School (9–10), General · Elements, Compounds and ChangesStemPy LabStemPy Lab
Medium
9.
Write the symbol of each element: nitrogen, magnesium, potassium, silver, mercury.
High School (9–10), General · Elements, Compounds and ChangesStemPy LabStemPy Lab
Easy
10.
Silicon is called a metalloid. What does that mean?
High School (9–10), General · Elements, Compounds and ChangesStemPy LabStemPy Lab
Medium
11.
Four elements are tested. Element P is a shiny grey solid that rings when struck, and it can be…
High School (9–10), General · Elements, Compounds and ChangesStemPy LabStemPy Lab
Easy
12.
For each, name the sign of a chemical change, and the new substance if you can.
High School (9–10), General · Elements, Compounds and ChangesStemPy LabStemPy Lab
Medium
13.
When a candle burns, the wax near the flame melts, and the flame burns.
High School (9–10), General · Elements, Compounds and ChangesStemPy LabStemPy Lab
Medium
14.
Say whether each is a physical or a chemical change, with a reason.
High School (9–10), General · Elements, Compounds and ChangesStemPy LabStemPy Lab
Easy
15.
Air has about 78 % nitrogen, 21 % oxygen and 1 % other gases by volume.
High School (9–10), General · Separation of MixturesStemPy LabStemPy Lab
Medium
16.
100 mL of a mixture of methanol (boiling point 338 K) and water (373 K) is distilled.
High School (9–10), General · Separation of MixturesStemPy LabStemPy Lab
Medium
17.
Simple distillation needs boiling points more than about 25 K apart.
High School (9–10), General · Separation of MixturesStemPy LabStemPy Lab
Easy
18.
A sample of alum has some sand and some common salt in it.
High School (9–10), General · Separation of MixturesStemPy LabStemPy Lab
Medium
19.
Three known dyes have these Rf values in a solvent: dye A 0.25, dye B 0.48, dye C 0.82.
High School (9–10), General · Separation of MixturesStemPy LabStemPy Lab
Medium
20.
A dye has an Rf of 0.42 in a solvent. The solvent front moves 11.5 cm.
High School (9–10), General · Separation of MixturesStemPy LabStemPy Lab
Medium
21.
In a chromatography experiment, the solvent front moves 12.5 cm from the starting line, and one…
High School (9–10), General · Separation of MixturesStemPy LabStemPy Lab
Easy
22.
A 50 g mixture has iron filings, sand and common salt.
High School (9–10), General · Separation of MixturesStemPy LabStemPy Lab
Medium
23.
A mixture has sand, salt and water. Describe how to get the sand, the salt and the water as three…
High School (9–10), General · Separation of MixturesStemPy LabStemPy Lab
Medium
24.
Choose a method to separate each mixture, and name the property it uses.
High School (9–10), General · Separation of MixturesStemPy LabStemPy Lab
Easy
25.
The beams of a car's headlights can be seen clearly on a foggy night, but not on a clear night.
High School (9–10), General · Mixtures, Solutions and ColloidsStemPy LabStemPy Lab
Medium
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