Secondary 4 - Science Review

Which of the following element is an alkali-metal

• Lithium (Li)

• Beryllium (Be)

• Fluorine (F)

• Neon (Ne)

Which of the following element is the most explosive?

• Potassium (K)

• Magnesium (Mg)

• Chlorine (Cl)

• Helium (He)

Which of the following element is stable (doesn't form molecules with other elements)

• Sodium (Na)

• Calcium (Ca)

• Bromine (Br)

• Neon (Ne)

Who am I?

I am an alkaline-earth metal with 2 electrons shells.

• Helium (He)

• Lithium (Li)

• Beryllium (Be)

• Magnesium (Mg)

Which of the following element form a negative ion.

• Sodium (Na)

• Aluminum (Al)

• Fluorine (F)

• Argon (Ar)

What is the charge of a boron (B) ion?

• -2

• +2

• -3

• +3

How many valence electrons does a calcium atom have?

• 2

• 4

• 20

• 40

Which of the following molecule represents an acid?

• Ba(OH)₂

• H₂SO₄

• KCl

• Mg(Cl)₂

Which of the following molecules represents an electrolyte?

• C₆H₁₂O₆

• H₂O

• CO₂

• Mg(Cl)₂

Which of the following equation is a balanced reaction for the neutralization of an acid and a base?

• H₂SO₄ + Ba(OH)₂ -> BaSO₄ + H₂O

• Mg(OH)₂ + H₂CO₃ -> MgCO₃ + 2 H₂O

• KOH + HCl -> KH + ClOH

• 2 H₂SO₄ + O₂ -> 2 SO₄ + 2 H₂O