Elements, Compounds, and Mixtures Grade 6 & 7

What is an element?

• A substance that cannot be broken down into simpler substances by chemical means.

• A substance that can be broken down into simpler substances by physical means.

• A substance that is composed of only one type of atom.

• A substance that can be broken down into simpler substances by chemical means.

Give an example of an element.

• oxygen

• nitrogen

• hydrogen

• carbon

What are the physical properties of compounds?

• Color, odor, taste

• Melting point, boiling point, density, solubility, and conductivity

• Viscosity, hardness, malleability

• pH, reactivity, stability

How are compounds different from elements?

• Compounds are pure substances made up of only one type of atom, while elements are made up of two or more atoms.

• Compounds are made up of two or more elements physically combined, while elements are pure substances made up of only one type of atom.

• Compounds are made up of only one type of atom, while elements are made up of two or more atoms.

• Compounds are made up of two or more elements chemically combined, while elements are pure substances made up of only one type of atom.

What is a mixture?

• A mixture is a combination of two or more substances that are chemically bonded together.

• A mixture is a single substance that cannot be separated into its components.

• A mixture is a combination of two or more substances that are not chemically bonded together.

• A mixture is a type of pure substance that has a fixed composition.

Name a separation technique used to separate mixtures.

• Filtration

• Evaporation

• Combustion

• Distillation

What are the properties of elements?

• Behavior

• Characteristics or attributes

• Physical properties

• Chemical properties

What are the physical properties of compounds?

• Color, odor, taste, and texture.

• Viscosity, malleability, and hardness.

• Reactivity, stability, and combustibility.

• Melting point, boiling point, density, solubility, and conductivity.

What is the difference between a compound and a mixture?

• A compound has a fixed composition, while a mixture can have variable composition.

• A compound is made up of two or more elements, while a mixture can be made up of elements or compounds.

• A compound is chemically bonded, while a mixture is physically mixed.

• A compound is a homogeneous mixture, while a mixture can be homogeneous or heterogeneous.

Name a separation technique used to separate compounds.

• Distillation

• Decantation

• Evaporation

• Filtration