Using examples, explain the difference between a physical property and a chemical property.

Physical Property: colour. Chemical property: pH

Explanation:

Physical Properties are those that can be measurable or observable. For example: Colour, Temperature, solublity, fusing point.

Chemical property are those that change with the composion of the matter. For example: pH, calorific value, combustion.

the formula would be mgso4

mgso[subscript]4

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms