LSS Particulate Nature of Matter

Ice, water and water vapour are made up of the same elements.

• TRUE

• FALSE

Answer explanation

Ice, water and water vapour are all made up of H2O molecules!

Which of the following statements best describes the nature of matter based on its fundamental particle behaviour?

• Matter is composed of continuously connected particles that remain stationary in a fixed arrangement.

• Matter is made up of tiny static particles that maintain a consistent and predictable pattern.

• Matter consists of small, discrete particles that are in constant and random motion.

• Matter is composed of invisible particles that exhibit periodic motion based on external forces.

Which of the following diagram correctly represents Brownian motion?

• 
• 
• 

Match the following

• Solid

• 
• Liquid

• 
• Gas

• 

Match the following

• definite volume

• Liquid

• no definite shape

• Solid

• can be compressed

• Gas

Organize these options into the right categories

Groups:

(a) Solids

,

(b) Liquids

,

(c) Gases

• particles are held together by strong forces of attraction

• particles are arranged in a very disorderly manner

• particles are far apart

• particles are held together by very strong forces of attraction

• particles are very closely packed

• particles are held together by weak forces of attraction

• particles vibrate about their fixed positions

• particles move randomly and slide past one another

• particles are arranged in a more disorderly manner

• particles are arranged in an orderly manner

• particles move randomly and quickly

• particles are closely packed

Diffusion is the net movement of particles from a region of

• higher concentration to a region of lower concentration

• lower concentration to a region of higher concentration

What is the process that occurs when ice (solid state) changes to water (liquid state)?

When a substance in the solid state is heated, the substance expands.

Which of the following best explains why?

• The distances between the particles increase.

• The number of particles increase

• The size of all the particles increases.

• Both the number and size of all the particles increase.

Answer explanation

When a substance in the solid state is heated, its particles gain energy and vibrate more vigorously about their fixed positions. The distances between the particles increase. This causes the volume of the substance to increase. As a result, the substance expands.

The number and size of particles in a substance do not change during expansion and contraction. Thus, there is conservation of mass.

Organize these options into the right categories

Groups:

(a) heating a solid

,

(b) cooling a solid

• particles vibrate less vigorously about their fixed positions

• substance contracts

• particles gain energy

• distances between the particles decrease

• volume increases

• volume decreases

• particles vibrate more vigorously about their fixed positions

• substance expands

• distances between the particles increase

• particles lose energy