Chemical reactions
Magnesium + oxygen causes?
magnesium oxide
How can you hear sound?
Through vibrations
What travels faster light or sound?
Lights travels faster than sound
What is the definition of a balanced diet?
Having a diet with the correct amount of nutrients needed for your body.
How many elements are in the periodic table?
There are 18 elements in the periodic table
What is combustion?
A process where a substance reacts to oxygen gas and gives off heat.
What is amplitude in sound waves?
How loud the sound is in a sound wave
What is white light made up of?
It is made up of all the colours in the rainbow mixed together.
What are the 7 nutrients?
They are: Lipids,Carbohydrates,Protein,Vitamins,Minerals,Fibre and Water.
What does K stand for?
K stands for Potassium
What is a physical change?
A reaction where the matter can be reversible/stays the same.
What is frequency in sound waves?
How high or low the pitch is in a sound wave
Why does a blue book appear blue in light?
It is because the light absorbs all the other colours but reflects the blue.
What poisonous gas is in cigarettes?
Carbon Monoxide is a poisonous gas in a cigarette
Are the elements in group 1 metal or non-metal?
They are (alkali) metals
What is a displacement reaction?
When a more reactive element displaces a less reactive element for example- magnesium chloride + potassium forms potassium chloride + magnesium.
What does sound travel faster in - liquid or solid?
Sound travels faster in solids
What is refraction?
It is a process where light travels from 1 medium to another
What causes scurvy?
When you don't have enough vitamin c.
What is the order of reactivity in halogens (least to most?
Fluorine,Chlorine,Bromine,Iodine
What is an endothermic reaction?
A chemical reaction is where heat is absorbed from the surrounding to form products.
Why can't humans hear ultrasound?
Ultrasound has a frequency greater than 20000Hz
What is dispersion?
When white light travels and splits into the colours of its components ( the rainbow) through a medium like a glass prism
What is caused when you drink too much alcohol?
Brain damage is caused when you drink too much alcohol
Why are group 8 elements known as group 0
Because the atoms in group 8 cannot combine with the other elements to form a compound