Workbook: Going Through Answers in Chapter 5 Worksheet

3 Thoughts:
1) I had learnt the difference between word equation and symbol equation. An example for a word equation is: Magnesium + Oxygen ---> Magnesium Oxide. But if you want to represent the equation in chemical symbol, it is like this: 2Mg + O2 ---> 2MgO.
2) Understand which are reactants and which is product. Example, Water Vapour + Carbon ---> Sugar. Water vapour and carbon are the reactants while sugar is the product.
3) Understand that element is the simplest substance and cannot be broken down further. Example, a magnesium cannot be broken into simpler substances as it is an element.

2 Questions:
1) Why did scientists change the spelling of 'sulphur' to 'sulfur'?
2) How did scientists carry out experiments to test whether which substances mix together will form another substance?

1 Useful application:
1) By knowing all of these scientific concepts, I can apply what I know to my schoolwork and examinations.