Mixing Matter

What are all things made of?

• matter

• atoms

• Both A and B are true

• Neither A nor B are true

What do pure iron and pure gold have in common?

• They are both chemical compounds

• They have the same number of electrons and protons

• They both only exist as solids

• They are each made up of a single element

Hydrogen and oxygen atoms bond to form a water molecule. What does the word bond mean in this sentence?

• move in circles around one another

• make more copies of themselves

• share something and join together

• split apart from each other

What are the three kinds of particles inside of an atom?

• molecules, compounds, and elements

• protons, neutrons, and electrons

• helium, oxygen, and hydrogen

• chemicals, neutrons, and protons

Scientists identify an ammonia molecule as NH₃. How many hydrogen atoms are there in one molecule of ammonia?

• one

• three

• four

• There isn't enough information here to determine the answer.

How would scientists identify a molecule that contains two hydrogen (H) atoms, one sulfur (S) atom, and four oxygen (O) atoms?

• HHSOOOO

• Hh₂SOooo₄

• H₂SO₄

• HS₄O₂

Why is it hard to turn a baked cake back into its ingredients?

• The ingredients went through chemical changes.

• The ingredients went through physical changes

• The ingredients broke apart into atoms.

• The ingredients disappeared.

If two atoms of hydrogen join together, they form a ______________.

• solution

• mixture

• molecule

• nucleus

Which of these is an example of a physical change?

• an apple turning brown when exposed to air too long.

• fireworks exploding in bright flashes of color

• spoiled food smelling bad in a trash can

• large rocks getting crushed into gravel

Which of these is an example of a chemical change?

• rust forming on metal after it gets wet

• raisins and peanuts being mixed in a bowl

• pouring chocolate syrup over frozen strawberries

• glass bottles breaking when dropped