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