Atomic Basics
What does the atomic number represent?
Answer: Number of protons
What type of bond involves the transfer of electrons?
Answer: Ionic
What type of reaction is: A + B → AB?
Answer: Synthesis
How many particles are in 1 mole?
Answer: 6.02 × 10²³
What does the limiting reactant determine?
Answer: The amount of product formed
How do you calculate atomic mass from subatomic particles?
Answer: Protons + neutrons = Atomic mass
What type of bond forms between two nonmetals?
Answer: Covalent
Identify the type: Zn + CuSO₄ →
and predict the products
Answer: Single replacement
and ZnSO₄ + Cu
What is the molar mass of CO₂?
Answer: 44 g/mol
In the equation: 2H₂ + O₂ → 2H₂O
How many moles of H₂O form from 2 moles of H₂?
Answer: 2 moles
Why do isotopes of the same element have different masses?
Answer: They have different numbers of neutrons
Why do ionic compounds conduct electricity in water but not as solids?
Answer: Ions are free to move in solution but fixed in a solid
Identify Type if reaction
Predict the products and
Balance: Fe + O₂ →______
Synthesis
4Fe + 3O₂ → 2Fe₂O₃
How many moles are in 88 g of CO₂?
Answer: 2 moles
If 4 moles of H₂ react with excess O₂, how many moles of H₂O form?
Answer: 4 moles
An atom has 17 protons and 18 electrons. What is its charge and element?
-1 charge, Chlorine ion (Cl⁻)
Predict the type of bond and formula for calcium and fluorine.
Answer: Ionic, CaF₂
Predict the products, type, and Balance:
Na₂SO₄ + BaCl₂ →
Answer: BaSO₄ + 2NaCl, Double replacement
How many grams are in 0.5 moles of NaCl?
Answer: 29.25 g
If theoretical yield is 50 g and actual yield is 40 g, what is percent yield?
Answer: 80%
Explain why elements in the same group have similar chemical properties.
They have the same number of valence electrons
Compare metallic, ionic, and covalent bonding in terms of electron behavior.
Answer:
Balance: ___C8H18 + ___O2 = ___CO2 + ___H2O
_2_C8H18 + _25_O2 = _16_CO2 + _18_H2O
Convert 3.0 moles of O₂ to particles.
Answer: 1.806 × 10²⁴ molecules
Given: 2Al + 3Cl₂ → 2AlCl₃
If you start with 4 moles Al and 3 moles Cl₂, identify the limiting reactant and moles of product formed.
Answer: