STEP Chemistry Midterm review

The atom

100

What are the three subatomic particles?

Proton, Neutron, Electron

200

How many electrons can a shell have? Two answers

2 (1st shell), 8 (every other shell)

300

What is the plum pudding model?

An old model of the atom that showed an atom being mainly positively charged with small electrons in that positive space

400

What is the AMU (atomic mass unit) of each subatomic particle

Protons and Neutrons - 1

Electrons - 0 :(

500

What did the Ancient Greeks refer to chemistry as?

Alchemy

Naming

100

name CO₂

Carbon Dioxide

200

What is the molecular formula of Titanium Fluoride?

TiF₂

300

Name NO₃

Nitrate

400

Name I₇P₅

Heptaiodine pentaphosaide 

500

What is the molecular formula of Sodium Phosphate

Na₃PO₄

Balancing

100

N₂ + H₂ --> NH₃

N₂ + 3H_{3 -->} 2NH₃

200

CH₄ + O₂  --> CO₂ + H₂0

CH₄ + 2O₂  --> CO₂ + 2H₂0

300

Al + H₂SO₄ --> Al₂(SO₄)₄ + H₂

2Al + 3H₂SO₄ --> Al₂(SO₄)₃ + 3H₂

400

C₃H₈ + O₂ --> CO₂ +H₂O

C₃H₈ + 5O₂ --> 3CO₂ +4H₂O

500

Na₃PO₄ + MgCl --> NaCl + Mg₃(PO₄)₂

2Na₃PO₄ + 3MgCl₂ --> 6NaCl + Mg₃(PO₄)₂

Periodic table 1

100

What element has an atomic number of 6?

Carbon

200

What group has 7 valence electrons?

17 or Halogens

300

What group are the noble gases?

18

400

Which elements in group 17 are non-solids at a base temperature?

Bromine (liquid) and Fluoride (gas)

500

What element is named after a famous scientists?

Einsteinium

Periodic table 2

100

How do you determine an elements atomic mass?

Protons + Neutrons

200

Is Aluminum a metal or non-metal?

Metal

300

How many elements are liquids at a base level?

2 (Bromine and Mercury)

400

How many Metalloids are on the periodic table?

6

Boron, germanium, silicon, antimony, arsenic, and tellurium

500

What is the atomic mass of an element that has 342 Protons?

684