8.6A&C Classifying Matter and Properties of Water Reteach

Elements, Compounds and Molecules, oh my!

Multiple Choice

What term describes the attraction between molecules of different substances?

• Cohesion

• Adhesion

• Surface tension

• Capillary action

Multiple Choice

Explain how it is possible to float a needle on the surface of water even though it is more dense than water.

• Due to adhesion

• Due to surface tension

• Due to capillary action

• Due to buoyancy

Multiple Choice

Water being absorbed by a paper towel is an example of which phenomenon?

• Cohesion

• Adhesion

• Surface Tension

• Precipitation

Multiple Choice

Which of the following is responsible for water molecules sticking together to form droplets?

• A. Cohesion

• B. Adhesion

• C. Surface Tension

• D. Magnetism

Multiple Choice

Which of the following is responsible for water molecules sticking to other surfaces?

• A. Cohesion

• B. Adhesion

• C. Surface Tension

• D. Friction

Multiple Choice

Which forces are responsible for capillary action?

• Adhesion, cohesion, and surface tension

• Gravity and friction

• Pressure and temperature

• Magnetism and electricity

Multiple Choice

Capillary Action can pull the water _____

• Upwards

• Downwards

Multiple Choice

Refer to the picture; this is occurring because of:

• Cohesion

• Adhesion

• Capillary action

• Surface tension

​Pure Substance

​Pure Substances are Elements or Compounds!

What is a compound?

​Compound - a substance whose smallest particle includes more than one element chemically bonded together.

For example, water (H₂O) is a compound of hydrogen and oxygen atoms bonded together.

​

​

​

​Even though compounds are made up of more than 1 type of atom, they are pure substances because the atoms are bonded together.

​All of the molecules are the same. They all are one red and two blue atoms chemically combined together.

All compounds are molecules, but not all molecules are compounds.

​

Elements are molecules too, but they are made up of more than one of the SAME ATOM.

​PUT THIS DIAGRAM IN YOUR NOTES!!! USE COLORED PENCILS!

Compounds and Elements are Pure substances, but Mixtures are not.

Mixtures have more than one kind of molecule!

​Mixtures - contain more than 1 type of a substance, without a chemical bond between everything.​

Multiple Choice

What is the term for combining 2 or more DIFFERENT atoms together?

• atoms

• elements

• molecules

• compounds

Multiple Choice

What is the picture displayed?

• atom
• element
• molecule
• compound

Multiple Choice

Are these molecules also compounds?

• YES
• NO

Multiple Choice

Are these molecules also compounds?

• YES
• NO

Multiple Choice

Carbon dioxide is formed when two oxygen atoms chemically combine with a carbon atom. Which term best describes carbon dioxide?

• atom

• mixture

• element

• compound

Multiple Select

Choose all the images that represent compounds.

Multiple Select

Choose all the images that represent molecular elements (diatomic elements).

Multiple Choice

Which of these is an element?

• Salt (NaCl)

• Water (H20)

• Oxygen (O)

• Carbon Dioxide (CO2)

Multiple Choice

What type of substance is being modeled here?

• Element

• Compound

• Homogeneous Mixture

• Heterogeneous Mixture

Multiple Choice

What type of substance is being modeled here?

• pure substance of one element

• mixture of two elements

• mixture of two compounds

• pure substance of one compound

Multiple Choice

What type of substance is being modeled here?

• Element

• Compound

• Homogeneous Mixture

• Heterogeneous Mixture

Multiple Choice

What type of substance is being modeled here?

• Element

• Compound

• Homogeneous Mixture

• Heterogeneous Mixture

Multiple Choice

Which diagram(s) models a pure substance?

• i and iv

• ii and iii

• v and vi

• i and iii