Chemistry PLTL Week 7

Balancing practice

100

_FeS + _HCl → _H₂S + _FeCl₂

FeS + 2HCl → H₂S + FeCl₂

200

Identify the type of chemical reaction and balance the following equation:

_Pb(OH)₂ + _HCl → _H₂O + _PbCl₂

Pb(OH)₂ + 2HCl → 2H₂O + PbCl₂

300

_P₄O₁₀ + _H₂O → _H₃PO₄

P₄O₁₀ + 6H₂O → 4H₃PO₄

400

_AlBr₃ + _K₂SO₄ → _KBr + _Al₂(SO₄)₃

2AlBr₃ + 3K₂SO₄ → 6KBr + Al₂(SO₄)₃

500

Identify the type of chemical reaction and balance the following equation:

_C₃H₈ + _O₂ → _CO₂ + _H₂O

Combustion reaction

C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

Throwback Q's

100

What is Avogadro's number and what does it represent?

6.022x10^23

Number of molecules/atoms/particles in a mole

200

What is 575.2 dm in km?

.05752 km

300

What is a chemical change?

Reactions in which one or more reactants are transformed into chemically different substances (products)

400

Substance A (20 g/mol) and Substance B (25 g/mol) have the same mass of 100g. How does the molar mass affect the number of moles in the given mass of these two different substances?

Because they have fixed molar masses based on their formulas, the amount of substance in the same mass of two different compounds (that have two different formulas) differ.

500

Identify the chemical formula of the following compound:

Potassium permanganate

KMnO₄