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  1. Problems
  2. /Mixtures and Solutions
  3. /Elements, Compounds and Changes

Elements, Compounds and Changes

Chemistry
+ Upload a Problem
More in Mixtures and SolutionsMixtures, Solutions and ColloidsSeparation of MixturesElements, Compounds and Changes
14 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