Naming & Formulas
Write the formula for Dinitrogen tetroxide.
N₂O₄
What is the pH range of acids?
Less than 7
What does the Law of Conservation of Mass state?
Matter cannot be created or destroyed. or mass of reactants = mass of products
Two elements combine to form one product. What type of reaction is this?
Synthesis
Write the formula for Carbon tetrafluoride.
CF₄
What is the name of CuCl₂?
Copper(II) chloride
What is the pH range of bases?
Greater than 7
If 150 g of calcium carbonate decomposes into 66 g of carbon dioxide and calcium oxide, what is the mass of calcium oxide?
84 g
One compound breaks down into two or more products.
Decomposition
Name the compound SO₃.
Sulfur trioxide
What is the formula for Iron(III) oxide?
Fe₂O₃
What pH value represents a neutral substance like pure water?
7
Balance: H₂ + O₂ → H₂O
2H₂ + O₂ → 2H₂O
Mg + 2HCl → H₂ + MgCl₂ — What type of reaction is this?
Single displacement
Which property best describes most molecular compounds?
a) High melting point
b) Conduct electricity in water
c) Low melting point
c) Low melting point
Write the formula for Calcium nitrate.
Ca(NO₃)₂
True or False: Acids have a bitter taste and feel slippery.
False (that’s bases!)
Balance: Fe + O₂ → Fe₂O₃
4Fe + 3O₂ → 2Fe₂O₃
2H₂ + O₂ → 2H₂O — What type of reaction is this?
Synthesis
What kind of elements form molecular compounds?
Two non-metals
Name this compound: Ni₃(PO₄)₂
Nickel(II) phosphate
You’re helping clean the kitchen. You notice the lemon cleaner smells sharp and makes your hands a bit dry, while the window cleaner feels slippery and has a bitter smell.
Question:
Based on these observations, which cleaner is more likely acidic and which is basic? Explain how you know.
The lemon cleaner is acidic — acids often have a sour smell or taste and can irritate the skin.
The window cleaner is basic — bases feel slippery and have a bitter smell.
Balance: C₃H₈ + O₂ → CO₂ + H₂O
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
2NaOH + CuSO₄ → Na₂SO₄ + Cu(OH)₂ — Identify the reaction type.
Double displacement
List the 7 diatomic elements.
H₂, O₂, F₂, Br₂, I₂, N₂, Cl₂ (“Dr. HOFBrINCl”)