1. Must know that an element only has one kind of atom Should know that a mixture is made of different atoms mixed together Could know that a compound is made of different atoms joined together

2. Compounds and Mixtures

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4. Hydrogen is an element. Oxygen is an element. We can mix hydrogen and oxygen together. We can have twice as much hydrogen as oxygen We can have twice as much oxygen as hydrogen. Water is a compound made of hydrogen and oxygen joined together There is always twice as much hydrogen as oxygen