G9-SCI-L1 Matter in our surroundings

What fundamental property did early Indian philosophers use to classify matter?

• Chemical composition
• Atomic structure
• Five basic elements
• Physical states

Which of the following best explains why sugar dissolves in water?

• Sugar particles are destroyed
• Water particles expand
• Sugar particles fit between water particles
• Chemical reaction occurs

What property of matter particles allows for diffusion?

• Their large size
• Their continuous motion
• Their rigid structure
• Their identical shape

How does increasing temperature affect the kinetic energy of particles?

• Decreases it
• Has no effect
• Increases it
• Reverses it

Which state of matter has particles with the least freedom of movement?

• Solid
• Liquid
• Gas
• Plasma

What property allows gases to be easily compressed?

• High density
• Strong intermolecular forces
• Large particle size
• Large spaces between particles

Why do solids generally maintain their shape?

• Weak intermolecular forces
• High kinetic energy of particles
• Strong forces of attraction between particles
• Absence of particles

What happens to the particles of a solid when it's heated to its melting point?

• They stop moving
• They start vibrating faster
• They decrease in size
• They change color

What is the SI unit for temperature used in scientific measurements?

• Celsius
• Fahrenheit
• Kelvin
• Rankine

What is the process called when a solid changes directly into a gas without becoming a liquid?

• Condensation
• Sublimation
• Deposition
• Vaporization