Classifying Matter: Elements and Mixtures

Which of the following best describes an element?

• A substance made of two or more types of atoms bonded together

• A substance made of only one type of atom

• A mixture of different compounds

• A substance that can be separated by physical means

What is the main difference between a compound and a mixture?

• Compounds can be separated by physical methods, mixtures cannot

• Compounds are made of only one type of atom, mixtures are not

• Compounds have atoms chemically bonded, mixtures do not

• Mixtures are always homogeneous, compounds are always heterogeneous

Which of the following is an example of a homogeneous mixture?

• Sand and iron filings

• Air

• Italian salad dressing

• Orange juice with pulp

What does a chemical formula with only one symbol from the Periodic Table represent?

• A compound

• A mixture

• An element

• A heterogeneous mixture

Which method would best separate sand from water?

• Evaporation

• Filtration

• Distillation

• Freezing

Which statement is true about pure substances?

• They can be separated by physical means

• They contain only one type of particle

• They are always mixtures

• They are always heterogeneous

Tags

NGSS.MS-PS1-4

Which of the following is a compound?

Tags

NGSS.MS-PS1-1

What is the best way to separate salt from a saltwater solution?

• Filtration

• Sifting

• Evaporation

• Magnetism

A student is given a clear liquid and told it contains only one type of molecule. How should the student classify this substance?

• Element

• Compound

• Homogeneous mixture

• Heterogeneous mixture

You are given a sample that contains iron filings and sulfur powder. Describe a method to separate the two substances and explain why it works.

• Use a magnet to attract the iron filings, leaving the sulfur behind, because iron is magnetic and sulfur is not.

• Add water to dissolve both substances.

• Heat the mixture to melt both substances.

• Use filtration to separate them.