In this question you will gain marks for using good English, organising information clearly and using scientific words correctly.
Some students want to build an electromagnet.
The students have the equipment shown below.
3 ㄹ
00
Insulated wire
Iron nail
Power supply
Connecting leads
Stool paperclips
Wooden clamp
and stand
Describe how the students could build an electromagnet. Include in your answer
how the students should vary and test the strength of their electromagnet.
(6)

The consumption of fossil fuels could be

Explain the difference between each pair of concepts. a. frequency and relative frequency b. percentage and relative frequency a. select the correct choice below. a. frequency is the total number of observations in a data set. relative frequency is the number of times a particular distinct value occurs. b. frequency is the number of times a particular distinct value occurs. relative frequency is the ratio of the frequency of a value to the total number of observations. c. frequency is the total number of observations in a data set. relative frequency is the ratio of the number of times a particular distinct value occurs to the frequency. d. frequency is the number of times a particular distinct value occurs. relative frequency is the ratio of the frequency of two different values.

Which compound is held together by the electrostatic force between two ions? a. co2 b. cci4 c. h2s d. mgf2