1. On the periodic table elements are shown using by using symbols of 1 or 2 letters rather than their whole name. For example Oxygen is O and Lead is Pb. Suggest 1 reason for this?
A. Some of the names are difficult to spell
B. To stop confusion because the symbols are the same in all languages whereas the names of the elements can be different.
C. When scientist came up with the periodic table they could not be bothered to spend time writing out all of the names

2. After a chemical reaction, the properties of the products are:
A. The same as the properties of the reactants
B. Different than the properties of the reactants
C. A combination of the properties of the reactants

gleb22848    1   28.05.2021 13:31    0