Solar and lunar eclipses
Microorganisms and food webs
Neutralisation
Electricity
100
What causes a solar eclipse?
when the moon blocks the sun
100
What is the primary source of energy in a food web?
the sun
100
What happens when an acid is neutralized by a base?
It becomes neutral
100
What is the circuit symbol of a lamp?
200
During a lunar eclipse, the Earth is positioned between which two celestial bodies?
the sun and moon
200
How do decomposers contribute to the food web?
they return the energy to the ground
200
Describe the chemical reaction that takes place during neutralization.
acid + alkali --> salt and water
200
What is the flow of electric charge in a closed circuit called?
current
300
Explain the difference between a solar eclipse and a lunar eclipse.
a solar eclipse is when the moon blocks the sun and and casts a shadow on the earth. Lunar eclipse occurs when the Sun casts Earth's shadow onto the Moon.
300
Define what a microorganism is and provide an example.
it is a very small organism. bacteria etc
300
Define the pH scale
the pH scale shows the acidity and alkalinity of a substance. the lower the pH the more acidic and the higher the pH the more alkaline. pH is neutral
300
What is component that measures electrical current? and what is its circuit symbol?
amps or A and the symbol is
400
Why is it safe to look directly at a total lunar eclipse with the naked eye?
because you're not looking at the sun directly
400
Explain the role of producers in a food web.
producers make their own food and provide energy for the food web
400
Provide an example of a neutralization reaction that occurs in everyday life.
antacids, toothpaste, quick lime, baking soda
400
Define the difference between conductors and insulators in terms of electricity.
conductors are materials that allow electrons to pass through. Insulators don't allow electrons to pass through
500
Draw a solar eclipse
500
Describe the process of photosynthesis and its importance in food webs.
carbon dioxide + water --> glucose + oxygen
plants do photosynthesis to make their own food
500
What are the products of sodium hydroxide and hydrochloric acid?
sodium chloride and water
500
A simple circuit has 2 lamps. If you remove one lamp, what happens to the current?
it will increase