Elements, Compounds & Mixtures

A sample of the element copper is broken down into the smallest possible particles that will still be considered copper. Each particle is this situation would be a(n) _________

• molecule

• atom

• compound

• mixture

Tags

NGSS.MS-PS1-1

What type of matter can be separated with physical change?

• atom

• element

• compound

• mixture

Which one of these is a compound

• Chlorine (Cl) *can be found on the Periodic table*

• Sodium Hypobromite (NaBrO₄) *not on the periodic table*

• Sand on the beach *not on the periodic table*

• Iron (Fe) *can be found on the periodic table*

Tags

NGSS.MS-PS1-1

Sugar is added to a glass of water and stirred. Which observation is evidence that the sugar has dissolved?

• The sugar crystals are no longer visible

• The water changed colors

• There was a temperature change when they were mixed

• Bubbles formed in the water

Tags

NGSS.MS-PS1-2

The table above describes some properties of three substances. If they were mixed together, which options would be best to separate them?

*Note - The particles of all 3 substances are the same size*

• Use a sifter to separate the yellow sulfur, then melt the salt because it has a lower melting point than metal

• Put the mixture in a large bucket of water. The metal filings will sink, the salt will dissolve and the sulfur will explode

• Create a chemical change that will change all of the substances in to new substances

• Use a magnet to remove the metal filings, then dissolve the salt in water to separate it from the sulfur

Tags

NGSS.MS-ETS1-2

Which one of the substances above is an element?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-1

The above table shows minerals found in Earth's crust. Based on the information, which one is NOT a compound?

• hematite

• calcite

• quartz

• graphite

Tags

NGSS.MS-PS1-1

A scientist discovers a new substance. When he tried to break down the substance into simpler parts, he was unsuccessful when he tried to use a physical change to separate the components. Only when he created a chemical reaction, he was able to break down the substance into it's simpler components. What should the scientist classify the substance as?

• compound

• atom

• homogeneous mixture

• colloid

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

Which particle cannot be separated by physical or chemical means?

• atom

• molecule

• solution

• crystal

Click on every option that is an example of a pure substance? (Choose 3)

• Water (H₂O)

• Lucky Charms cereal

• Gold (Au)

• Kool Aid

• Sugar (C₆H₁₂O₆)