Past paper questions 1. Final Examination 2019, Question 15
Elements can be classified as metals or non-metals. The table shows some of the properties of three elements from the periodic table. Melting point (°C) Boiling point (°C) Conductor of electricity
Element 1 Element 2 Element 3
1538 −7
−101
2862 59
−34
Which element (1, 2, or 3) is most likely to be a metal? Justify your answer. 2. Final Examination 2022, Question 13
A student carried out a series of experiments to investigate the properties of sucrose (table sugar). In the first experiment, the student investigated the melting point of sucrose.
Metal cube (Zn)
Sucrose
Metal cube (AI)
Yes No No
Hot plate
)Fig. 20.7
Two metal cubes of equal volume were placed on a hotplate as shown in the diagram. One was made of zinc (Zn) and the other was made of aluminium (Al). One gram of sucrose was placed on top of each cube and the hotplate was turned on.
a. The sucrose on the aluminium melted before the sucrose on the zinc. What does this result
tell us about the two metals? Put a tick () in the correct box. Aluminium is a better conductor of heat than zinc. Aluminium has a higher melting point than zinc. Aluminium is less reactive than zinc. Aluminium atoms have less neutrons than zinc atoms.
b. The dials on the hotplate were made of plastic, a non-metal. State two properties of non- metals.
j Go to page 107 of your Assessment Book to answer more exam-style questions.