Classifying Elements, Compounds, and Mixtures

This lesson covers the classification of matter into elements, compounds, and mixtures. Elements are the simplest form of matter, consisting of one type of atom, and are listed on the periodic table. Compounds are chemical combinations of elements that can be separated by chemical reactions. Mixtures are physical blends of substances and can be homogeneous or heterogeneous, with various methods available for separation. The lesson concludes with examples to help identify whether a substance is an element, compound, or mixture.

What are the two main characteristics of matter?

• It has mass and takes up space.

• It is invisible and weightless.

• It can be seen and touched.

• It is always in a solid state.

Which of the following is the simplest form of matter?

• Mixture

• Solution

• Compound

• Element

How many natural elements are there in the periodic table?

• 90

• 118

• 150

• 50

What is the chemical formula for water?

• H2O

• CO2

• NaCl

• C12H22O11

Tags

NGSS.MS-PS1-1

Which of the following is a compound?

• Iron

• Gold

• Salt

• Oxygen

Tags

NGSS.MS-PS1-1

What type of mixture is Kool-Aid?

• Compound

• Element

• Homogeneous

• Heterogeneous

Which method can be used to separate a mixture of iron filings and confetti?

• Distillation

• Chromatography

• Using a magnet

• Electrolysis

What is the process called when water is separated into hydrogen and oxygen using electricity?

• Electrolysis

• Chromatography

• Distillation

• Filtration

Tags

NGSS.MS-PS1-5

Which of the following is a homogeneous mixture?

• Orange juice with pulp

• Air

• Cheeseburger

• Salad

What type of mixture is the ocean?

• Element

• Compound

• Heterogeneous

• Homogeneous

Tags

NGSS.MS-ESS2-4