The Human Body
What are the tiny blood vessels where oxygen and nutrients pass into the cells?
Cappilaries
Name one property of gases.
Gases have mass and take the shape of their container.
In a force diagram, what does an arrow show?
The direction and size of the force.
What part of an animal is made into a fossil?
The skeleton
Why is mucus important in the respiratory system’s defence?
It traps germs and prevents them from entering the lungs.
What are three signs that a chemical reaction has occurred?
Gas produced, color change, temperature change, smell
What do we call the force that pulls magnets and magnetic materials together, even without touching?
Magnetic force
Which type of rock may contain fossils?
Sedimentary
What does the heart pump through the blood to give energy to cells?
Oxygen
How does temperature affect how solids dissolve in liquids? Explain using particles.
Higher temperature makes particles move faster, so solids dissolve quicker.
If you push a toy car harder, what happens to the applied force?
It increases, causing the car to move faster.
What type of rock is created on the seabed?
Sedimentary
What type of germ can be killed by antibiotics: bacteria or viruses?
Bacteria
What do we call the substances at the start of a chemical reaction? And what are the new substances called?
Reactants are at the start; products are formed after the reaction.
A parachute opens. Which force becomes stronger: gravity or air resistance?
Air resistance
The most important feature of sedimentary rocks is that they are...
different colors or having layers
In which direction does oxygen move when we breathe in?
nose → windpipe → lungs → blood
A reaction causes the beaker to become warm and the liquid turns blue. What two pieces of evidence show it is a chemical reaction?
Temperature change and color change
Why does the Moon stay in orbit instead of flying into space?
Earth’s gravity pulls it inward.
How do you know that a rock is an intrusive igneous rock?
having large crystals