Elements, Compounds, and Mixtures Answers

Which is a substance that is made up of only one type of atom?

The table shows the percentages of hydrocarbons that are found in a sample of crude oil.HydrocarbonsPercentageparaffins30naphthenes49aromatics15asphaltics6.0Based on the given information, what is the best classification for this sample of crude oil?

The table describes how some substances were formed.SubstanceDescriptionPFormed by boiling pure waterQFormed by combining three hydrogen atoms to every nitrogen atomRFormed by adding 5 g of sugar to 1 L of waterSFormed by compressing carbon under high pressureBased on the given descriptions, which substance is most likely a mixture?

The chemical formula for an emerald is Be3Al2(SiO3)6. An emerald can be described as

Which is a pure substance?

Which cannot be chemically broken down into simpler substances?

What can a drop of liquid mercury be described as?

A gravel can be broken down into different kinds of substances by physical processes. No chemical reactions are needed to separate different parts of gravel into pure substances. This is because gravel is a(n)

Which sample is a pure substance?

A chemist is studying an unknown substance and could break the substance into its elemental components only by using chemical means. Based on this observation, how should the unknown substance be classified?