REACTIVITY SERIES
Which metal is more reactive: sodium or copper?
sodium
What do we call waves where the vibrations are at right angles to the direction of energy transfer?
Transverse waves
What is the name for the full range of electromagnetic waves, from radio waves to gamma rays?
The electromagnetic spectrum
What subatomic particle moves to cause an object to become charged?
Electron
What do we call the path through which electricity flows?
Circuit
Magnesium is added to hydrochloric acid and a gas is released. What is the gas?
hydrogen
What is the distance between two adjacent wave crests called?
Wavelength
Which type of EM wave comes just after visible light on the spectrum and has slightly more energy?
Ultraviolet
What happens when two negatively charged objects are brought close together?
They repel
What does Ohm’s Law state about the relationship between voltage, current, and resistance?
V = I × R
Zinc is placed in a solution of copper sulfate. A reaction occurs. What does this tell you about the relative reactivity of zinc and copper?
Zinc is more reactive than copper
Which part of a wave tells us how much energy it carries?
Amplitude
In the visible spectrum, which colour has the shortest wavelength and highest energy?
Violet
What is it called when a charged object causes a neutral object to become charged without touching it?
Induction
A 6 V battery is connected to a 2 Ω resistor. What is the current?
3 A
Silver is placed in hydrochloric acid, but no reaction is observed. What does this tell you about silver’s position in the reactivity series relative to hydrogen?
Silver is less reactive (lower down) than hydrogen
A wave has a frequency of 5 Hz and a wavelength of 2 m. What is its speed?
10 m/s
What is the speed of all electromagnetic waves in a vacuum?
300,000,000 m/s (or 3 × 10⁸ m/s)
What word describes charging by rubbing two different materials together?
Triboelectric
Two identical bulbs are connected in series to a 6 V battery. What voltage does each bulb receive?
3 V
Carbon can be used to extract iron from its ore, but not to extract aluminium. What does this tell you about the positions of iron and aluminium in the reactivity series?
iron is less reactive than carbon, while aluminium is more reactive than carbon
What happens to the wavelength of a wave if its frequency increases but speed stays the same?
It decreases
What colour is produced when red and green light are combined in equal amounts?
Yellow
Amber is a natural material famous for its triboelectric effect. What is it called in Greek?
Elektron
In a parallel circuit, one branch draws 2 A and the other 3 A. What is the total current from the battery?
5 A