Heat Energy
The three types of heat transfer
Convection, Conduction & Radiation
Why does a straw appear bent in water?
Refraction is occurring
The distance between two peaks of a wave is called?
Wavelength
Use your periodic table.
How many protons, electrons and neutrons in calcium.
Bonus mark: What is the electron configuration?
20, 20, 20
2, 8, 8 2.
What gas is produced when a metal and acid react together?
What is the name of the process that heat uses to move through a liquid?
Convection
A water bottle looks green because...
Reflects only green light
Draw a soundwave with a quiet, high pitched sound.
frequent waves, not too high above midline.
Nuclear reactors release energy through which process?
Nuclear Fission
A practical was completed to test the effectiveness of different materials to keep water cold. A
A metal drink bottle was compared to a plastic water bottle.
Identify the:
- Independent variable
- Dependent variable
- 2 controlled variables
IV - Type of material used (metal and plastic)
DV: Temperature
CV: Amount of water, time left
Which type of heat transfer does not involve particles?
Radiation
The law of reflection
The angle of incidence = the angle of reflection
What is the main reason astronauts must communicate via radio when in space?
Sound can't travel through a vacuum
What is the difference between Uranium-235 and Uranium-238?
They are isotopes. Elements of the same atomic number BUT different number of neutrons.
Acidic solutions increase the concentration of which type of ion?
Hydrogen ions (H+)
A lid on a coffee cup prevents heat transfer occurring by...
Convection
Correctly draw and label a diagram showing reflection. Include: angle of incidence, angle of reflection and normal.
The pitch of a soudwave is determined by:
Frequency
Atoms are more stable if the electrons are filled with electrons. Ions are when an element will lose or gain an electron on the outer (valence) shell.
If Fluorine (9) has an electron configuration of 2,7 it is easier to GAIN 1 extra electron than lose 7.
What would be the OVERALL charge of the Fluorine once it GAINS an extra electron?
-1
A neutralisation reaction is shown below:
ACID + BASE = WATER + SALT
Hydrochloric acid + Sodium Hydroxide would make what product?
Sodium Chloride
You are given three different materials: aluminum, copper, and wood. Your task is to test which material is the most effective at conducting heat. You will do this by heating one end of each material and observing how quickly the other end heats up.
Results: Aluminum (the wax melted in 30 seconds), Copper (the wax melted in 20 seconds), Wood (the wax did not melt even after 2 minutes).
Make a conclusion based on these results and justify your answer.
copper is the most effective conductor of heat because the wax melted the fastest when using the copper material (20 seconds). Aluminum is the second most effective conductor, as the wax melted in 30 seconds. Wood is the least effective conductor of heat since the wax did not melt at all within the given time.
What effect does a concave lens have on light rays passing through it?
It diverges light rays causing them to spread out.
Imagine you are shining a flashlight through three different materials: air (a gas), water (a liquid), and glass (a solid). Describe how the speed of light changes as it travels through each of these materials and explain why these changes occur.
Francium-223 has a half-life of approximately 22 minutes.
If a sample initially contains 200g of Francium-223, how much would remain after 66 minutes?
25g
Balance the following equation:
Al+O2→Al2O3
4Al+3O2→2Al2O3