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science homework
1. Classify the following compounds as Organic or Inorganic:
CH₄ → __
H₂O → __
C₂H₅OH → __
NaCl → __
C₆H₁₂O₆ → __
CO₂ → __
Q2. Classify the following as Acid, Base, Salt, or Oxide:
HCl → __
NaOH → __
NaCl → __
CO₂ → __
H₂SO₄ → __
Ca(OH)₂ → __
Q3. Write the valency of each element:
Na → __
Mg → __
Al → __
O → __
Cl → __
Ca → __
H → __
N → __
Q4. Write the correct chemical formula using the valencies:
Sodium + Chlorine → __
Magnesium + Oxygen → __
Aluminum + Oxygen → __
Calcium + Chlorine → __
Hydrogen + Oxygen → __
Q5. Challenge : Identify the type of compound:
CaO → __
HNO₃ → __
KOH → __
CaCO₃ → __
C₂H₆ → __

Science Homework – Ionic and Covalent Bonds
Choose the correct answer:
An ionic bond is formed by:
a) Sharing electrons
b) Transferring electrons
c) Sharing protons
Choose the correct answer:
A covalent bond is usually formed between:
a) Two non-metals
b) A metal and a non-metal
c) Two metals
Complete:
In an ionic bond, electrons are __ from one atom to another.
Complete:
In a covalent bond, atoms __ electrons.
Identify the type of bond:
NaCl → __
H₂O → __
H₂ → __
MgO → __