States
While a substance is melting, what happens to its temperature even though heat is still being added?
Stays the same
Which term describes the temperature at which a solid turns into a liquid?
Melting point
A force is best defined as:
A push or a pull on an object
Name a factor which increases the rate of dissolving.
Stirring, increase temperature, smaller pieces.
Give an example of an irreversible change
cooking, burning, cutting
What happens to the total amount of matter when ice melts into water?
Stays the same
Evaporation happens at what temperature?
At any temperature, at the surface of a liquid
Which instrument is used to measure force? What are the units?
Spring balance, Newtons
A substance that can dissolve is called:
Soluble
Give an example of a reversible change
Dissolving, changing state
Which state of matter has a fixed shape and a fixed volume?
Solid
What is the process called when a solid changes into a liquid due to heating?
Melting
If two forces of 4N and 6N act on an object in the same direction, the net force is:
10N
A solute is:
The substance being dissolved
Give an example of a chemical change
burning, cooking, rusting, baking
In which state are particles most tightly packed and only vibrate in place?
Solid
As a substance changes from solid to liquid to gas, what happens to the particle energy?
Increases
Define friction:
A force that opposes the motion between two surfaces
A solvent is:
The substance that does the dissolving
Give an example of a physical change
Cutting/bending/tearing, changing state, dissolving
Which best describes the attraction between particles in a gas?
Very weak
What is the process called when a gas changes into a liquid?
Condensation
What is the difference between mass and weight?
Mass is amount of matter, weight is gravity pulling on that mass
Give an example of a solution
salt water, sugar water, lemonade etc
What is a sign that a chemical change has occurred?
Change in smell, change in colour, gas produced, produce new substance