Kinetic Particle Theory and Elements, Compounds, Mixtures

The graph below shows the cooling curve for a substance. Which of the following gives the correct states for a substance at P, Q and S?

• P: Solid,
  Q: Liquid
  S: Gas
• P: Gas, 
  Q: Liquid
  S: Solid
• P: Liquid, 
  Q: Gas and Liquid
  S: Solid
• P: Gas, 
  Q: Gas and Liquid
  S: Liquid

Which of the following statements about the kinetic particle theory is not true?

• The particles of a gas move faster than those of a liquid.
• The particles of a solid have more kinetic energy than those of a gas.
• The particles that make up matter are always moving.
• The forces of attraction between the particles of a solid are very strong.

Which of the following statements about the particle of a gas is true?

• Gases can be compressed because their particles are smaller than those of liquids or solids.
• Gases can be compressed because there is plenty of space between their particles.
• Gases can be compressed because they have low boiling points.
• Gases can be compressed because their particles are more elastic than those of liquids or solids.

Sodium melts at 98^oC and boils at 890^oC. Which diagram best shows the arrangement of sodium atoms at 100^oC?   

• A
• B
• C
• D

How many elements are represented in the compound Na₂CO₃?

• 1

• 2

• 3

• 6

Classify the picture with the correct label.

• Mixture of Compounds
• Mixture of Elements
• Compound
• Mixture of Elements & Compounds

Tags

NGSS.MS-PS1-1

Which of the following contains an element, a compound and a mixture?

• air, magnesium and nitrogen
• air, silver and soil
• chlorine, gold and water
• sea water, sodium and water

Three students make statements about the differences between elements, compounds and mixtures.

Student 1: Compounds contain at least two elements.

Student 2: All elements exist only as atoms and not molecules.

Student 3: Mixtures consist only of compounds.

Which student(s) is/are correct?

• 1, 2 and 3

• 1 only

• 2 only

• 3 only

Which of the following is a correct description for the particles present in solids?

• closely packed and does not move

• closely packed and vibrate in fixed positions

• closely packed and slide past one another

• far apart and move rapidly in all directions

When a substance changes from gas to liquid, it is called...

• Evaporation

• Condensation

• Melting

• Freezing