chemical reactions
What is a chemical reaction?
A process where substances change into different substances with new properties
What is a balanced diet?
A diet that contains the right amounts of all the necessary nutrients.
What is the unit for measuring sound?
Decibel (dB).
What is reflection?
When light bounces off a surface.
what is a series circuit
A circuit where there is only one path for current.
What is the difference between exothermic and endothermic reactions?
Exothermic reactions release energy while endothermic reactions absorb energy
Name one effect of smoking on the body.
It can cause lung cancer or respiratory diseases.
what are 2 types of waves?
longitude and transverse
What is refraction?
When light bends as it passes from one medium to another.
what is a parallel circuit?
A circuit that provides multiple routs for current.
What is a neutralization reaction?
When an acid reacts with a base to form salt and water
What is the function of the heart?
To pump blood around the body.
What do we call it when sound bounces back to you, like when you shout in a cave?
An echo.
Name the colours of the visible spectrum.
Red, orange, yellow, green, blue, indigo, violet.
What is the unit of electric current?
Ampere (A).
What happens to atoms during a chemical reaction?
Atoms are rearranged but not created or destroyed
What is a communicable disease?
A disease that can be spread from person to person.
What is an echo?
A reflected sound wave.
Why does a red apple look red?
Because the apple reflects red light into your eyes and absorbs all the other colours.
What does a resistor do in a circuit?
It limits the flow of electric current.
What is a combustion reaction?
A reaction where a substance reacts with oxygen to produce heat and light
What is the role of white blood cells?
They help fight infection.
Why can’t sound travel through space?
Because there are no air particles in space for the sound waves to move through.
Why do you sometimes see a rainbow after it rains?
Sunlight passes through raindrops, which split the light into all its colours, making a rainbow.
What is Ohm’s Law?
Voltage = Current × Resistance