Atoms
What is the smallest unit of matter?
An atom
What is an element?
A pure substance made of only one type of atom
What is a molecule?
Two or more atoms bonded together
What is a compound?
Two or more different elements chemically combined
What are the three main parts of an atom?
Protons, neutrons, electrons
What is Oxygen's atomic number?
8
Is O₂ a molecule?
Yes.
Provide an example of a compound.
H₂O
Which particle has a negative charge?
Electron
What is Magnesium's atomic mass?
24.31
What holds atoms together in a molecule?
Chemical bonds
What makes compounds different from molecules?
Compounds contain different elements
Where are protons and neutrons found in an atom?
The nucleus
What is the chemical symbol for Silver?
Ag
State the chemical formula of sodium chloride.
NaCl
Can compounds be separated by physical means?
No (only chemical means)
What determines the type of atom (element)?
The number of protons
What are the two names and directions of sections that are used to help read the periodic table?
Groups - vertical
Periods - horizontal
Is CO₂ a molecule, a compound, or both? Explain why.
Both — it is a molecule because atoms are bonded together, and a compound because it contains different elements
State the chemical formula of methane.
CH4