2 Atoms, ions, and compounds Flashcards
What is the relative mass of a proton? (1 mark)
1
What is the relative mass of a neutron? (1 mark)
1
What is the relative mass of an electron? (1 mark)
1/2000
What charge does a proton have? (1 mark)
1+
What charge does an electron have? (1 mark)
1-
What charge does a neutron have? (1 mark)
0
Why is an atom neutral? (2 marks)
There are the same number of protons and electrons,
so the charges cancel out.
What identifies an element, makes all the atoms of that element the same element? (1 mark)
The atomic number, aka the number of protons
State two differences in chemical properties between water and heavy water. (2 marks)
Heavy water has:
Higher melting and boiling points
Higher density
What is heavy water? (1 mark)
A form of water with an isotope of H in it (known as deuterium, 2,1H).
What is an isotope? (2 marks)
Atoms of an element with different numbers of neutrons, but the same number of protons.
What is an ion? (2 marks)
An ion is a charged atom.
It has a different number of protons from electrons.
Define relative isotopic mass. (2 marks)
Relative isotopic mass is the mass of an isotope relative to 1/12th of the mass of a carbon-12 atom.
Define relative atomic mass. (3 marks)
Relative atomic mass is the weighted mean mass of an atom relative to 1/12th of the mass of a carbon-12 atom.
How is the relative atomic/isotopic mass determined? (1 mark)
Using a mass spectrometer.
