Describe how the plum pudding model of the atom was replaced by the nuclear model.
From Chemistry 1, Higher
24 marks
Describe how sodium and chlorine atoms form an ionic compound. You may use dot-and-cross diagrams.
From Chemistry 1, Higher
32 marks
Calculate the relative formula mass (Mr) of CaCO₃. (Relative atomic masses: Ca = 40, C = 12, O = 16)
From Chemistry 1, Higher
93 marks
An atom of potassium has mass number 39 and atomic number 19. Give the numbers of protons, neutrons and electrons.
From Chemistry 1, Higher
103 marks
Explain why sodium chloride has a high melting point and conducts electricity when molten but not when solid.
From Chemistry 1, Higher
112 marks
Calculate the relative formula mass (Mr) of Mg(OH)₂. (Relative atomic masses: Mg = 24, O = 16, H = 1)
From Chemistry 1, Higher
172 marks
An element has two isotopes: mass 35 (75%) and mass 37 (25%). Calculate its relative atomic mass.
From Chemistry 1, Higher
183 marks
Explain why methane has a low boiling point.
Score 0 / 22 · 0 of 8 marked
This paper is written by Plasmo in the style of the Edexcel GCSE Combined Science exam. It is not a past paper and is not produced or endorsed by the exam board.