What is an Atom? Video

What are atoms?

• The fundamental building blocks of chemistry

• The smallest particles of matter

• The elements found on the periodic table

• The ingredients of baked goods

How many kinds of atoms have scientists discovered?

• 118

• 100

• 50

• 200

Who is credited for first proposing the idea of an atom?

• Democritus

• John Dalton

• Albert Einstein

• Jean Perrin

What did Democritus call the particles that could not be divided any further?

• Atomos

• Molecules

• Elements

• Particles

What did Marianne Poults and Antoine Lavoisier discover about pure substances?

• They could be broken down further through chemical reactions

• They could not be divided any further

• They were consistent all the way through

• They were complex mixtures of matter

What are compounds?

• New substances formed by mixing elements

• Elements that cannot be broken down any further

• Pure substances found in nature

• Gases at room temperature

What happens when oxygen and iron react?

• They form rust

• They form a toxic orange powder

• They form water

• They form a brown powder

What did John Dalton discover about the quantities of elements used in chemical reactions?

• They always react in small whole number ratios

• They react in random ratios

• They react in fractions

• They react in multiples of 10

What did Albert Einstein propose to confirm the existence of atoms?

• An experiment and an equation

• A microscope

• A chemical reaction

• A mathematical calculation

What did Jean Perrin do to confirm the existence of atoms?

• Conducted experiments using Einstein's concept

• Developed a new microscope

• Used mathematical equations

• Studied the work of John Dalton