How many elements are there on Earth?

What are elements?

The particles inside copper are called ______ atoms. All these ______ atoms are the same.

Gold is made of _____ ______

True or False:

Everything is made from atoms.

What are molecules?

Each element is given its own chemical symbol. These are usually one or two letters long.
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What is the symbol for hydrogen?

What is the chemical symbol for magnesium?

What two main groups are the elements divided into?

Give the properties of metals.

(ignore the exceptions)

Give the properties of non-metals.

(ignore the exceptions)

define a mixture

What are the four rules for mixtures?

What is a compound?

Give an example of a compound

What is the word equation for carbon dioxide?

What does 'di' in dioxide mean?

What is the symbol equation for lead dioxide?

(lead = Pb)

Elements can be joined in ratios. For example., say you had one red brick joined onto two yellow bricks. What would the ratio of red to yellow be?

READ:
When lead and oxygen combine they make lead oxide. But, it is more complicated than this because there are three different lead oxides. These are the three:

What is the Law of Multiple Proportions?