Test 1 - Molecules and compounds

Question 1

What is an element, a molecule, and a compound?

Answer 1

-Element: Elements are all the different types of atoms we know exist on Earth, there are 118 knon elements on earth.
-Molecule: A molecule is made out of two or more atoms which has combined
-Compound: A compound is a mix of two or more different atoms.

Question 2

What are the differences between molecules and compounds?

Answer 2

-All compounds are molecules but not all molecules are compounds . A compound is made out of 2 or more different atoms combined, but a molecule is just made out of 2 or more atoms, no matter if they are different or not.

Question 3

How and why do chemical bonds form?

Answer 3

-when atoms share or transfer valence electrons, they create chemical bonds to become molecules.

Question 4

What is a Valence Shell?

Answer 4

-The valence shell is the outermost layer on an atom, it consists of up to 8 electrons.

Question 5

What is a chemical formula and what information does it tell us?

Answer 5

-A chemical formula is like a recipe, that tells you which atoms and how many of each atom. Like H2O, that’s 2 hydrogen and 1 oxygen.