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