Chemistry - Elements, Compounds, and Mixtures

What is a compound?

A compound is a pure substance made up of two or more different kinds of atoms

What is an element?

An element is a pure substance consisting of only one type of atom.

What is Chromatography?

Chromatography is a process in which a mixture is separated using differences in the ability of the components of the mixture to pass through a substrate

Is gasoline a mixture or compound?

Mixture If they ask for summery- Sample answer: Gasoline is a mixture. It contains several different kinds of compounds that can be present in a variety of ratios. Include: -Gasoline contains many different compounds. -The ratios of the different compounds in gasoline can vary.

Which is a characteristic of mixtures? A)They are chemically bonded together. B)They can be classified as pure substances. C)They have fixed ratios between their components. D)They can be separated by physical processes.

They can be separated by physical processes

The chemical formula for emerald is Be3Al2(SiO3)6. An emerald can be described as A)a pure substance because it is a compound. B)a pure substance because it is an element. C)an impure substance because it is chemically combined. D)an impure substance because it is a mixture.

a pure substance because it is a compound.

Which sample is a pure substance? A)a test tube of zinc oxide B)a container of zinc and oxygen C)aa flask of pond water D)a jar of soil

a test tube of zinc oxide

Which is a pure substance? A)soda B)gasoline C)salt water D)carbon dioxide

carbon dioxide

Which method would be best for separating the components of a mixture that is made from two different liquids? A)distillation B)evaporation C)filtration D)sorting

distillation

Which cannot be separated into simpler substances? A)compound B)element C)solution D)mixture

element

Which is a substance that is made up of only one type of atom? A)compound B)element C)solution D)mixture

element

A solid precipitate is formed from the reaction of lead nitrate and sodium chromate. What would be the best method to separate this solid from the solution? A)distillation B)evaporation C)filtration D)sorting

filtration

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

mixture

A chemist is studying an unknown substance. He can break it into its elemental components only by using chemical means. Based on this observation, how should the unknown substance be classified? A)impure substance B)solution C)mixture D)pure substance

pure substance

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 A)compound. B)impure substance. C)mixture. D)pure substance.

pure substance.

You may think of petroleum as motor oil or gasoline. In fact, the oil that is removed from the ground is crude oil. Crude oil contains many different types of organic compounds, also known as petroleum products. During the refining process, the components of crude oil are separated. The main method used for separation is distillation, but some other methods are also used. After the components have been separated, they are tested for purity and then used in a variety of industries. Based on the information provided here, crude oil is:

A mixture If they ask for summery- Sample answer: I think crude oil is a mixture because it is made up of compounds that can be separated using distillation, a physical process.

What is a mixture?

A mixture is a combination of two or more pure substances that are not chemically combined

What is a pure substance?

A pure substance is a type of matter that cannot be broken down into simpler components without undergoing a chemical change

What is Distillation?

Distillation is a process in which a mixture is separated using the differences in boiling points of the different components of the mixture