Chemistry Final Test

Atoms

100

What subatomic particle is located on the OUTSIDE of the atom, weighing almost nothing?

Electron

200

What TWO subatomic particles are located in the nucleus of the atom, weighting 1amu each?

Neutron and Proton

300

What are the charges of the 3 subatomic particles within an atom? Electron, Proton, and Neutron

Negative, Positive, and Neutral 

400

How do atoms bond into a molecule? (what subatomic particle is used)

VALENCE electrons 

500

Find the number of Neutrons in an atom of Scandium (Sc) using the periodic table

atomic mass is 44.9 = rounded to 45

atomic number is 21

so      45 - 21 = 24

Periodic Table Organization

100

Which direction do GROUPS and PERIODS run on the periodic table?

Groups = Up and Down

Periods = Left to Right

200

How do we find the number of valence electrons? 

Look at the group number, or know that Transition Metals have 2-3

300

Does reactivity increase or decrease when going DOWN a GROUP?

INCREASE

400

Which group is MOST reactive with group 1 (name both of these families)

The HALOGENS (group 17) is most reactive with the ALKALI METALS (group 1)

500

What family of elements is located on the staircase, and act a bit like metals, and a bit like nonmetals

METALLOIDS

Elements, Compounds, & Mixtures

100

Identify if each of the following are elements or not: (yes/no)

Ti      NaCl     Mg     CO      H      Brass

Yes (Titanium)    No (salt=compound)                     Yes (Magnesium)    No (Carbon Monoxide=compound) Yes (Hydrogen)   No (Brass=mixture)

200

How are compounds combined? (Chemically or physically)

CHEMICALLY

300

What is a substance that is NOT chemically combined, and can be separated by physical means?

a MIXTURE

400

Is this a heterogenous or homogenous mixture?

Saltwater

HOMOGENOUS

500

Is this a heterogenous or homogenous mixture?

Bronze

HOMOGENOUS 

Physical/Chemical

100

Why is rust on iron, or tarnish spots on silver a chemical change?

There is a new substance formed that we cannot change back into the original substance

200

Is this a physical or chemical change? EXPLAIN

Two chemicals combine and create a gas

Chemical = a new substance is produced

300

Is this a physical or chemical change? EXPLAIN 

Salt is dissolved in water

Physical = no new substance is produced and you can get the salt back out of the water through evaporation

400

Name 3 PHYSICAL properties

Luster     Color     Melting Point     Solubility     Density   Odor     Magnetivity    Hardness

Boiling Point     Conductivity 

500

Name 3 CHEMICAL properties

flammability 

toxicity

reactivity

combustibility

WILD CARD CATEGORY

100

How many valence electrons do elements need to be "happy"? (Have a full outer shell, except Helium of course)

8

200

What 3 elements make up sugar/glucose?

Compound Formula fill in the blank shown below

___{6 ___12} ___₆

Carbon (C) 

Hydrogen (H)

Oxygen (O)

300

Where are ALL OF the NON METALS located on the periodic table? (can point, name them, etc, must include each one)

Hydrogen = top left of the table in group 1

The Rest= to the right and above the metalloids (top right of the table)

400

What law is described here:

"matter cannot be created or destroyed"

The Law of Conservation of Matter/Mass

500

Balance this equation! (you can use the board)

C + S₈ → CS₂

4 C  +  S₈  →   4 CS₂