MediumChemistryHigh School (9–10)GeneralMetals and Non-metals › Properties of Metals and Non-metalsNumerical
The density of iron is 7.87 g/cm³. Find the mass of 18 cm³ of iron.
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
The density of iron is .
- Find the mass of of iron.
- Which of lithium (), sodium () and magnesium () would float on water, which has a density of ?
Need a reminder? The key ideaShow
Metals are usually shiny, hard, malleable, ductile, sonorous and good conductors, with high melting points. Non-metals are usually dull, brittle and poor conductors. Exceptions: mercury is liquid, sodium is soft and floats, graphite conducts, iodine is shiny, diamond is very hard. Metalloids such as silicon have properties of both.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. (a) .
Step 2. (b) Lithium and sodium are less dense than water, so they float. Magnesium sinks.
Answer: (a) . (b) lithium and sodium.
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