Atoms and Chemistry

What are atoms?

• The elements found on the periodic table

• The basic units of matter

• The smallest particles in the universe

• The fundamental building blocks of chemistry

How many kinds of atoms have scientists discovered?

• 200

• 50

• 118

• 100

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

• Albert Einstein

• Jean Perrin

• John Dalton

• Democritus

What did Democritus call the particles that make up matter?

• Atoms

• Particles

• Elements

• Molecules

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

• They are consistent all the way through

• They are complex mixtures of matter

• They can be broken down into multiple substances

• They can be divided forever

What are compounds?

• Complex mixtures of matter

• New substances formed by the reaction of elements

• Substances that can be divided into multiple pure substances

• Elements that cannot be broken down any further

What happens when oxygen and iron react?

• They form a brown powder known as rust

• They form a gas

• They form a clear refreshing liquid

• They form a toxic orange 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 large whole number ratios

What did the scanning tunneling microscope allow scientists to do?

• Create new elements

• Calculate the size of atoms

• Split atoms apart

• See individual atoms

What did the experiment using light in the scanning tunneling microscope confirm?

• Atoms can be seen with normal light

• Atoms are smaller than the wavelength of light

• Atoms cannot be seen at all

• Atoms are larger than the wavelength of light