When a solid dissolves in a liquid, what happens to the solid particles?
They spread out evenly in the liquid, becoming invisible but still present
A crab eats a shellfish that has absorbed a toxic substance. Later, a sealion eats the crab. Why does the sealion have more of the toxic substance than the crab?
Because toxins accumulate in predators as they consume multiple prey over time
What is the opposite process of evaporation and boiling?
Condensation
What happens when a ray of light hits a mirror?
It reflects
What happens if one bulb breaks in a parallel circuit?
The other bulbs remain lit
An astronaut places a camera on the Moon. What is its weight measured in?
Newtons (N)
What are the three types of blood vessels in the human body?
Arteries, Veins and Capillaries
What are the four forces acting on a shopping trolley when it is pushed?
Gravity, Upthrust, Applied Force and Air Resistance
Why does a camera weigh less on the Moon than on Earth?
Because the Moon has less gravity than Earth
What does blood remove from the body as waste?
Carbon dioxide
What does blood transport to the organs to provide energy?
Nutrients
What is the boiling point of a substance?
The temperature at which a liquid changes into a gas
What happens if one bulb breaks in a series circuit?
All the bulbs turn off
Why must we wash our hands?
To remove germs and prevent the spread of disease
What is the opposite process of melting?
Freezing
Where does the energy for a food chain come from?
The Sun
What is the difference between a series circuit and a parallel circuit?
In a series circuit, electricity flows in one path; in a parallel circuit, electricity flows through multiple paths
What are the three main causes of diseases that infect humans? Clue: FBV
Bacteria
Fungi
Viruses, Bacteria and Fungi
What is thermal conductivity?
The ability of a material to conduct heat
When should we wash our hands?
Before eating, after using the toilet, sneezing or coughing
What does blood collect from the lungs and transport to the rest of the body?
Oxygen
What happens to the mass of an object when moved from Earth to the Moon?
Mass stays the same
Which substance has a melting point of 0C and a boiling point of 100C
Water
Which of the following is true:
evaporation only occurs above 100°C
Water boils at 100°C and boiling produces bubbles.
evaporation is faster than boiling
Arrange the stages of this food chain in the correct order: seaweed, seagull, crab, shellfish and
Seaweed → Shellfish → Crab → Seagull
What liquid carries oxygen around the body after it leaves the lungs?
Blood
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