Famous Scientists
Which scientist discovered gravity?
Isaac Newton
Which state of matter has the highest density?
Solid
How can you tell that a chemical reaction is happening?
Signs include bubbles of gas, a colour change, a temperature change, or a solid forming.
What is a force?
A push or a pull that can change an object’s movement or shape.
What is a cell
The smallest unit of life
Which famous TV scientist is known for commenting on nature and wildlife documentaries?
David Attenborough
Which state / states of matter cannot be compressed?
What is meant by the rate of a reaction?
How fast reactants are turned into products
Name two examples of forces.
Gravity, friction, air resistance, tension, magnetic force (any two).
Name an example of a specialized cell
red blood cell, sperm cell, nerve cell etc
Which scientist came up with the theory of evolution?
Charles Darwin
What is pressure?
Pressure is the amount of force applied to a surface, divided by the area over which the force acts. It tells us how concentrated a force is.
In gases, pressure is caused by particles colliding with the walls of their container.
Name two ways to increase rate of reaction
Higher temp
More surface area
Higher concentration
Catalyst
What is the equation to calculate speed
distance / time
What is an organelle
A part of a cell
Which scientist is known for the equation:
E = MC2
Albert Einstein
Explain what happens in terms of particles and energy when a solid melts
Solids gain energy
Move faster
Break bonds and change state
On a graph of amount of product vs time, what does a steeper line show?
A faster rate of reaction
How does mass differ from weight?
Mass is the amount of matter in an object (kg) and stays the same; weight is a force (N) and changes depending on gravity.
Which organelle within a cell carries out respiration?
Mitochondria
Which scientist is so famous for his work in electricity, that he has cars named after him!
Nikola Tesla
How does heat effect the pressure of a gas in a container. Explain how in terms of particles
Will increase the pressure as gas particles gain energy, move faster, and collide with side of container more often
Using particle collision theory, explain why increasing temperature increases the rate of reaction.
Higher temperature means particles move faster, collide more often, and collide with more energy, so more collisions lead to reactions.
Explain why a skydiver reaches a constant speed (terminal velocity)
Air resistance increases as the skydiver speeds up until it balances the force of gravity, so there is no overall force and the speed becomes constant.
Draw a fully labelled diagram of a animal cell
Teacher Judges