Pure substances and Mixtures Review

Which of the following is a compound?

• Nitrogen (N₂)

• 
  Hydrogen (H₂)

• Helium (He)

• Hydrochloric acid (HCl)

Tags

NGSS.MS-PS1-1

Which of the following do water (H₂O), rust (Fe₂O₃), and salt (NaCl) have in common?

• Water, rust, and salt are heterogeneous mixtures

• Water, rust, and salt are elements

• Water, rust, and salt are homogeneous mixtures

• Water, rust, and salt are compounds

Tags

NGSS.MS-PS1-1

A student made a snack after school by combining pretzels, peanuts, and raisins together in a bowl. What statement describes the student’s snack?

• It is a heterogeneous mixture

• It is a homogeneous mixture

• 
  It is a pure substance

• It is a compound

Which of the following models represents a pure substance?

• 
• 
• 
• 

Tags

NGSS.MS-PS1-1

Which image(s) would be considered pure substances?

• V

• I and II

• II and IV

• III and V

Tags

NGSS.MS-PS1-1

A mixture is what you get when you combine two substances in such a way that no chemical reaction occurs between the components. A solution is a mixture that looks exactly the same everywhere. Which of these mixtures is NOT a solution?

• a glass of apple juice

• a chocolate chip cookie

• a mixture of salt and water

• a mixture of sugar and water

Taylor was thirsty and decided to mix up a pitcher of lemonade. She put lemon juice, water, and sugar into a pitcher and stirred it to create this wonderful new drink. How could Taylor decide if she just created a mixture or a compound?

• it must be a compound because it all looks the same

• 
  if it were a compound, there would have been an explosion

• it must be a mixture as she can separate all of the individual ingredients

• 
  it must be a compound as she can separate all of the individual ingredients

Brass is an alloy of copper and zinc. The two metals are melted, mixed, and then solidified. How would you BEST classify brass?

• homogeneous mixture

• heterogeneous mixture

• pure substance: mixture

• pure substance: mixture

Orange juice is a heterogeneous mixture. Because it contains particles of pulp as well as liquid, its composition is not uniform throughout. Select ALL of the other heterogeneous mixtures.

• soil

• steel

• concrete

• kool aid

• open can of soda

What is one characteristic of a sample of matter that indicates it is a pure substance?

• It can be separated using by a physical means, such as filtering.

• If the composition of a sample is fixed, the sample is a pure substance.

• If the composition of a sample varies, the sample is a pure substance.

• 
  The components in a pure substance do not have to be in definite ratios.