Year 7 Half Yearly Practice Exam Flashcards
Name all the parts of a Bunsen burner
Barrel, air hole, gas hose, collar
Where is the hottest part of a Bunsen burner flame?
Just above the cone of unburnt gas
What is an Independent variable?
What is changed. How is it changed? Include equipment.
What is a Dependent variable?
What is measured. How is it measured? Include equipment.
What is a Controlled/constant variable?
Variables that need to be kept the same to keep the test fair.
What is air resistance?
When an object falls, it accelerates at first, but as it gets closer to the ground it falls at a constant speed. This is GRAVITY and AIR RESISTANCE pushing against each other. Air resistance tries to prevent an object falling to the ground, while gravity, which is much stronger, pulls it to the Earth.
In which direction does friction act?
Friction acts in an opposite direction to motion.
Describe an everyday situation where friction is used
eg. Striking a match: while you strike the match box, friction acts against the match and the rough surface, making heat which equals fire. If friction wasn’t there, you wouldn’t get a spark of fire.
eg. Gripping a pencil: your rough fingerprint keeps the pencil in your grip. If friction wasn’t there, you wouldn’t be able to hold anything.
What are all the charges in an atom?
- Protons (positive charge)
- Electrons (negative charge)
- Neutrons (neutral charge).
What does an atom look like?
An atom has two rings. Depending on how many protons or electrons it has, it is either POSITIVELY CHARGED or NEGATIVELY CHARGED.
What do atoms do?
Atoms build up big object like humans or pencil cases. Everything on Earth is built up from hundreds upon thousands of tiny atoms.
How can an object have an electrostatic charge?
ELECTROSTATIC CHARGE: Negative charge.
An object can have an electrostatic charge by having more electrons then protons.
What is an organism?
An organism is anything living.
eg. butterfly, bush, slug, human
What does the arrow represent in a food chain?
The arrow in a food chain says, “Is eaten by”.
ACTIVITY:
A rat is eating grass. He gets eaten by a hawk, who dies a week later on the forest floor.
Construct a food chain for this scenario on a piece of paper.
*Don’t put the sun in your food chains
Grass ➡ rat ➡ hawk ➡ decomposers
What is an abiotic factor?
Non living factors in an ecosystem, eg. rock, sky, water.
What is a biotic factor?
Living things in an ecosystem, eg. plants, animals, birds, bacteria.
Construct a food web out of the following animals:
Grass, rabbit, fox, berries.
Rabbit eats grass and berries
Fox eats rabbit
A balloon is rubbed against a jumper. It sticks there. Explain how.
As the balloon looses charge, the jumper gains it, so they have opposite charge. Opposites attract.
Describe friction as a contact force
Friction can be a contact force when two surfaces slide across each other, creating friction.
