Understanding Elements and Compounds

What is an element?

• A substance made of two or more different atoms chemically bonded together.

• A pure substance made of only one type of atom.

• A mixture of different substances.

• A compound that can be separated into simpler substances.

Which of the following is an example of a common element?

• Water

• Carbon

• Salt

• Sugar

What is a compound?

• A mixture of different elements.

• A pure substance made of only one type of atom.

• A substance made of two or more different atoms chemically bonded together.

• A solution of elements and compounds.

Which of the following is an example of a compound?

• Oxygen

• Hydrogen

• Water

• Nitrogen

What is the main difference between elements and compounds?

• Elements are mixtures, while compounds are pure substances.

• Elements are made of one type of atom, while compounds are made of two or more types of atoms chemically bonded.

• Elements can be separated by physical means, while compounds cannot.

• Elements are always gases, while compounds are always solids.

Which of the following is a method to separate mixtures?

• Chemical reaction

• Filtration

• Electrolysis

• Combustion

Which separation technique would you use to separate sand from water?

• Distillation

• Filtration

• Chromatography

• Evaporation

Which of the following is NOT a method to separate mixtures?

• Distillation

• Filtration

• Melting

• Chromatography

What is the process of separating a liquid from a solution by heating and cooling called?

• Filtration

• Distillation

• Chromatography

• Evaporation

Which of the following is an example of a mixture?

• Salt

• Air

• Water

• Carbon dioxide