Speed
If it takes 3 hours to drive a distance of 192km on a motorway, what would be your average speed in km/h?
Speed = Distance/Time
Speed = 192/3 = 64
So average speed is 64km per hour.
Which metals are attracted to a magnet?
Iron, cobalt, and nickle
Name the medium that sound travels fastest.
Air
Name the gas release when potassium reacts with water and how to test the gas.
(i) hydrogen
(ii) burning splint
State the function of the alveolus.
To allow gas exchange
What is your average speed in mph if you travel 15 miles in 2 hours and 30 minutes?
Speed = Distance/Time
Speed = 15/2.5 = 6 mph
So average speed is 6 miles an hour.
What is our best evidence that Earth has a magnetic field?
A compass needle lines up with it.
Name 2 properties of light.
(i) light travels in a straight line
(ii) light cannot pass through an opaque object
Name the salt formed when calcium carbonate reacts with hydrochloric acid. How to test the gas released in this reaction?
(i) calcium chloride
(ii) limewater turns cloudy
The variable that changes in an experiment known as...
independent variable
John decided to cycle to his friend’s house at a speed of 5km/h and the journey took 2 hours. How far did John cycle?
Using the formula of Distance = Speed x Time, this would be calculated as:
Distance = 5 x 2 = 10km.
Ancient people discovered magnetic rocks called lodestone. What did they use them for?
Compasses
What determines the loudness of sound?
Amplitude
What element with an atomic number of 14?
silicon
Why should you always do multiple trials in a science experiment?
To reduce bias
To make the results more reliable
Sally runs at a pace of 8km/h. If she ran for a period of four hours, how far has she travelled?
Distance =Speed x Time:
Distance = 8 x 4 = 32km.
What is a magnetic field?
an area where a magnetic force can be detected
Which property of light that enables the formation of the rainbow?
dispersion
Name first three noble gases in Group 8.
helium, neon, argon
Define pollination.
Transfer of pollen from the anther to stigma
If you were travelling at 30 miles per hour, how long would it take to travel a distance of 70 miles?
Time = Distance/Speed
Time = 70/30
Time = 70/30 = 2.33
2.33 x 60 = 140 minutes = 2 hours and 20 minutes.
How to increase the strength of an electromagnet? State 3 ways.
(i) increase number of coil
(ii) increase current
(iii) add iron core
Cyan, magenta and yellow are
secondary light colour
If you mix a strong acid with water what would happen?
The acid would become weaker.
Write the word equation for aerobic respiration.
glucose + oxygen --> carbon dioxide + water + (energy)