Pure Substance and Mixture

Which of these is an element?

• Salt (NaCl)

• Water (H20)

• Oxygen (O)

• Carbon Dioxide (CO2)

Which of these is a compound?

• Aluminium (Al)

• Carbon Dioxide (CO2)

• Nitrogen (N)

• Sand

Tags

NGSS.MS-PS1-1

If you were given two unknown SOLID, which tests should you do to identify if they are pure substance or mixture? (Choose 2 answers)

• Boiling Test

• Color Test

• Taste Test

• Melting Test

Tags

NGSS.MS-PS1-4

If you were given two unknown LIQUID, which test is the best test that you should do to identify if they are pure substance or mixture?

• Boiling Test

• Color Test

• Taste Test

• Melting Test

Tags

NGSS.MS-PS1-4

How would you know if the SOLID is a pure substance?

• It will melt at a range of temperature

• It will melt at a single temperature

• It will boil at a range of temperature

• It will boil at a single temperature.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Alice tested an unknown liquid.

How would she know if it is a mixture?

• It will melt at a range of temperature

• It will melt at a single temperature

• It will boil at a range of temperature

• It will boil at a single temperature.

Tags

NGSS.MS-PS1-4

Tristan is testing an unknown liquid, he noticed that it takes a longer time to boil, even if it started evaporating a few minutes ago. He checked the temperature, and it had gone up, after it had started boiling. What could this unknown liquid be?

• A Pure Substance

• A Mixture

• A Compound

• An Element

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

The components of Pure Substance are always present in exact composition?

• TRUE

• FALSE

The components of the pure substances cannot be separated by physical means.

• TRUE

• FALSE

In an endothermic reaction, the heat is released in the surroundings.

• TRUE

• FALSE

Tags

NGSS.HS-PS1-4