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A-level Chemistry Year 1
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Elements in group 17 form ions with which charge?
Barium oxide is an ionic salt. The empirical formula for this compound is…
A sample of Lithium was found to contain two isotopes only, Li and Li. The percentage of each isotope in the sample is given in the table below.
isotope
|
%
|
7Li
|
92.00
|
6Li
|
8.00
|
Use this data to calculate the relative atomic mass of lithium. Give your answer to two decimal places.
The atomic number of the atom shown above is
What is 10.987 expressed to three significant figures?
HCl(aq), HNO3(aq) and H2SO4(aq) are all examples of strong acids. Select the option below that gives the best definition of a strong acid.
Carboxylic acids, such as ethanoic acid represented above, are weak acids. Select the option that best defines what is meant by the “term weak acid”.
The total number of protons plus neutrons in the atom shown above is
The number of electrons in the atom shown above is
The atomic number of the atom shown above is