Elements, Compounds, and Mixtures — Unit test Answers
The diagram below shows some subatomic particles.Which of these statements best identifies the particle that is labeled with an X?
A single atom of an element has 11 protons, 11 electrons, and 12 neutrons. Which element is it?
Which physical method can be used for obtaining a sample of salt from a small beaker of salt water?
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?
Which is a substance that is made up of only one type of atom?
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?
Bromine, a liquid at room temperature, has a boiling point of 58°C and a melting point of –7.2°C. Bromine can be classified as a
Which pure substance can be classified as an element?
Which cannot be chemically broken down into simpler substances?
Which is a pure substance?
The chemical formula for an emerald is Be3Al2(SiO3)6. An emerald can be described as
Which best describes an element?
Which sample is a pure substance?
What can a drop of liquid mercury be described as?
Which method would be best for separating the components of a mixture that is made from two different liquids?
Which best describes a compound such as sodium chloride?
Air is made up of different gases, such as oxygen, nitrogen, and carbon dioxide. Which statement best describes these three components of air?
Which substance is a mixture?
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