Yr7 Revision Flashcards
(29 cards)
What are all materials made of?
Atoms
Atoms are the basic building blocks of matter.
How many protons and electrons do atoms contain?
The same amount
This balance maintains electrical neutrality in atoms.
What are the three main components of atoms?
Protons, neutrons, and electrons
Protons are positively charged, neutrons are neutral, and electrons are negatively charged.
Fill in the blank: Everything is made of _______.
[atoms]
True or False: Atoms can have different numbers of protons and electrons.
False
Atoms typically have equal numbers of protons and electrons to remain neutral.
What does the term ‘split’ refer to in the context of atoms?
The division of atoms into smaller parts or particles
Splitting atoms is often associated with nuclear reactions.
What axis does the Earth spin on?
The Earth spins on an axis
How long does it take for the Earth to complete one rotation?
Approximately 24 hours
What direction does the sun rise?
In the east
What direction does the sun set?
In the west
Why is it hotter in summer?
Because the sun’s rays spread over a smaller area
What happens to the sun at the North Pole during summer?
It doesn’t set
What is the difference in constellations seen in summer compared to winter?
Some constellations in summer are different from those in winter
What is the position of the sun at noon in summer?
The sun is higher in the sky
Fill in the blank: The Earth is tilted at an angle of _______.
[23.5 degrees]
What would it be like if the Earth were not tilted?
It would experience seasons like spring or summer year-round
What is the primary use of trapped air in insulation?
Trapped air is used to reduce heat transfer
Trapped air acts as an insulator, reducing the flow of heat.
What do you do when you are cold?
The hairs on your skin trap air
This helps to provide insulation against the cold.
Why is keeping a house warm considered a waste of resources?
It uses a lot of energy and is expensive
Energy conservation is crucial to avoid wasting valuable resources.
What percentage of heat loss is typically due to draughts?
10%
Draughts can significantly impact heating efficiency.
What are draught excluders used for?
To prevent heat loss through gaps
They help maintain indoor temperature by blocking cold air from entering.
What is double glazing?
Two layers of glass used in windows
This design improves insulation and reduces heat loss.
What is cavity wall insulation?
Foam or fibers injected into wall cavities
This technique enhances thermal efficiency in buildings.
Where is insulation typically laid in roofs?
Between the ceiling rafters
Proper insulation in roofs helps retain heat.
