JJ thomson experiment the atomic theory?

Chemistry

1 answer:

olga nikolaevna [1]3 years ago

3 0

Cathode Ray experiment to figure out electrons exist -> atoms can be broken up into subatomic particles

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Burning a candle melts the wax, but also burns the wick. Explain how burning a candle involves both physical and chemical change

k0ka [10]

Answer:

Burning of the candle is both physical and chemical change. Burning of the candle melts the wax and hence physical state of wax has changed from solid to liquid.

Again the wax combines with the atmospheric oxygen and changes to carbon dioxide, heat and light.

Thus both the changes are accompanied by the burning of the candle.

Explanation:

hope this helps!

~mina

3 0

3 years ago

How are the codes (chemical formulas) for pure substances different from those for mixtures?

Gnesinka [82]

Answer : The chemical formula of pure substances are different from those of mixtures because all the matter that exists on earth can be classified into two categories namely; pure substances and mixtures.

A pure substance always consists of a single element or compound. Example Oxygen is formed only of oxygen (O) atoms; whereas the table salt which is formed only by sodium chloride (NaCl) molecules is a compound which is made up of pure elements. A pure substance cannot be further divided into its components.

A mixture is made up of different compounds and/or elements. It can be easily separated using any physical method. Example, sand, salt and saw dust mixed together as a mixture. Also, it will not have a definite chemical formula.

Please refer the attachment for better understanding.