Atoms and Molecules

Atoms

100

Name the three main particles in an atom.

(Bonus 50 points for their charges)

Protons (positive)

Electrons (negative)

Neutrons (neutral) 

200

What happens when you change the number of protons? 

It becomes a different element.

300

How does the number of electrons compare to the number of protons in a neutral atom?

They are equal. They are the same number.

400

How do electrons move in an atom?

Electrons move in a cloud, not in set orbits or paths. 

Molecules and Compounds

100

What is a molecule? 

2 or more atoms bonded together. 

200

How many atoms are in CO₂?

3

300

What is the difference between a mixture and a compound?

A mixture can be separated physically.

A compound is chemically bonded. (can not be physically separated).

400

What elements are in this molecule?

C₆H₁₂O₈ (glucose)

Carbon

Hydrogen

Oxygen

Elements

100

What element is this? 

Al

Aluminium

200

How is Helium different from Lithium?

The number of protons

Helium: 2 protons

Lithium: 3 protons

300

What is the difference between elements and compounds?

Elements are pure substances (O₂)

Compounds are different elements (H₂O)

400

Why are there only 118 elements but so many compounds?

Elements can combine in many ways to form molecules and compounds.

Counting Atoms

100

How many atoms are in NaCl?

2

Sodium 

Chlorine

200

In Al₂(SO₄)₃, how many Aluminum atoms?

2

300

In Ca₃(PO₄)₂, how many Phosphorus atoms?

2

400

In 3Mg(C₂H₃O₂)₂, how many carbon atoms?

4

Random Chemistry

100

Name an example of a mixture.

Salad, pizza, trail mix

200

Which has more mass: a proton or an electron?

Proton

300

Both diamond and graphite are made of this element, but their atoms are arranged differently

Carbon

400

How many elements are in this chemical equation?

C₆H₁₂O₆NaCl

5 different elements