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Lesson · Grade 7 · Science

Atoms: What Everything Is Made Of

  • Grade 7
  • Science
  • 1 min 16 s
  • British Columbia
  • BC7-SC-09

The video zooms into a piece of gold and a drop of pure water to show they are made of tiny atoms. Gold has only one kind of atom, so it is an element, while water is a compound in which every molecule is one oxygen atom joined to two hydrogen atoms; since each has only one kind of particle, both are pure substances.

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In one sentence

The question this lesson answers

What are gold, water and everything else around us made of?

Let us zoom in on a tiny spot on a piece of gold.

Transcript

What the lesson says

What are gold, water and everything else around us made of?

Let us zoom in on a tiny spot on a piece of gold.

Up close, the gold is made of tiny particles called atoms.

Atoms are far too small to see, even with an ordinary microscope.

Every atom in this piece of gold is the same kind, a gold atom.

A substance with only one kind of atom is called an element.

Scientists know of 118 elements, each with its own kind of atom.

Now let us zoom in on a drop of pure water.

Water is made of two kinds of atoms, oxygen and hydrogen.

Each water molecule is one oxygen atom joined to two hydrogen atoms.

A substance made of different atoms joined together is called a compound.

In pure water, every molecule is exactly the same.

Elements and compounds are both pure substances, because each has only one kind of particle.

So everything is made of atoms, and elements and compounds are pure substances.

Curriculum

Where this fits

British Columbia, Grade 7

Science, Chemistry: elements and compounds are pure substancesBC7-SC-09

Next: Elements: One Kind of Atom

The outcomes and strands follow the British Columbia curriculum.

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