Which of these is a physical change?
Cooking food
Melting ice
Rusting iron
Burning wood
What is the definition of matter?
Anything that can be seen
Anything that has weight
Anything that has volume
Anything that has mass and occupies space
What property do solids and liquids share?
Definite volume
Compressibility
Ability to flow
Definite shape
What is Brownian motion?
Random movement of large suspended particles
Regular movement of particles
Flow of liquids
Compression of gases
Which factor does NOT affect evaporation rate?
Surface area
Color of liquid
Air currents
Temperature
What is the boiling point of water at normal atmospheric pressure?
100°C
0°C
50°C
150°C
Why do solids have definite shape?
Large distances between particles
Strong attractive forces between particles
Weak attractive forces
High compressibility
What is compressibility?
Ability to change shape
Ability to diffuse
Ability to reduce volume under pressure
What happens when baking soda reacts with vinegar?
Color change
Gas evolution
Formation of precipitate
Temperature decrease
What is the main difference between boiling and evaporation?
Evaporation produces bubbles
Evaporation occurs at boiling point only
Boiling occurs throughout liquid at specific temperature
Boiling occurs at surface only
Which of these is a chemical change?
Burning paper
Cutting paper
Breaking glass
Dissolving sugar
What indicates a chemical reaction has occurred?
Change in temperature only
Formation of new substances
Change in shape
Change in size
In which state does diffusion occur fastest?
Gases
Liquids
Plasma
Solids
Which of the following is NOT a common state of matter?
Gas
Solid
Liquid
Wood
Why are liquids and gases classified as fluids?
Because they are compressible
Because they have mass
Because they can flow
Because they have definite volume
Which has the strongest attractive forces between particles?
Which is NOT an indicator of chemical reaction?
Change in mass
Precipitate formation
Gas formation
What happens to the volume of a gas when it is compressed?
Remains constant
Increases
Becomes zero
Decreases
What is the fourth state of matter?
What is diffusion?
Movement of particles from high to low concentration
Mixing of two solids
Movement of particles from low to high concentration