1a4 marks
Complete the sentences about an atom.Use words from the list.You may use each word once, more than once, or not at all.
| Atom | Electrons | Negatively | Neutrons |
| Nucleus | Orbits | Positively | Protons |
An atom has a ...................................... charged nucleus surrounded by ................................. charged electrons.The nucleus contains protons and ....................................... .Almost all of the mass of an atom is in the .......................................... .
1b4 marks
i)
A swimming pool contains 9970 kg of water in 10 m3.
Calculate the density of water.
Use the equation: density = mass ÷ volume
Density = .............................................. kg/m3 [2]
ii)
The diagrams, A, B and C, show the particles in three states of matter.
Write the letters in the boxes to give the correct order of density, from most to least dense.
[1]
iii)
Explain why you chose the order in (b)(ii).
[1]
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