Atoms
What are the tiny building blocks of everything in the universe?
Atoms
An element is made of only one kind of what?
Atom
What do we call two or more atoms joined together?
A molecule
Which molecule is made of 2 oxygen atoms?
Oxygen gas (O₂)
What charge does a proton have?
Positive
What decides which element an atom is?
The number of protons
What atoms make up a water molecule?
2 hydrogens and 1 oxygen
Which molecule is made of 1 carbon and 4 hydrogens?
Methane (CH₄)
What part of the atom moves around the nucleus?
Electrons
True or False: Changing the number of neutrons changes the element.
False
What atoms make up carbon dioxide?
1 carbon and 2 oxygens
Which molecule is made of 1 carbon and 1 oxygen?
Carbon monoxide (CO)
If an atom has 6 protons, what element is it?
Carbon
Which element has just one proton in its nucleus?
Hydrogen
Same atoms can form very different substances. What are two examples made only of carbon?
Diamond and graphite
Which molecule is made of 2 hydrogens and 2 oxygens?
Hydrogen peroxide (H₂O₂)
Why do electrons stay near the nucleus instead of flying away?
Because opposite charges attract (positive protons pull on negative electrons)
Name two different forms of carbon that look and act very different.
Diamond and graphite (or graphene)
Why does hydrogen peroxide (H₂O₂) act differently from water (H₂O), even though they have the same elements?
Because the atoms are arranged differently
Which molecule is made of 2 nitrogens and 1 oxygen, also known as “laughing gas”?
Nitrous oxide (N₂O)