Chemical Formulae And Equation

The smallest unit of matter which can exist independently is called

• an atom

• a molecule

• a compound

• an element

Fill in the blank space to balance the chemical equation.

2KI + ____Cl₂ → 2KCl + I₂

• 1

• 2

• 3

• 4

When balancing this equation, Fe + Cl₂ → FeCl₃, what is the correct coefficient for Cl₂?

• 1

• 2

• 3

• 4

Given the formulae for calcium ion is Ca²⁺ and carbonate ion is CO₃^2-. Choose the correct chemical formula of calcium carbonate.

Diberi formula ion kalsium ialah Ca²⁺ dan ion karbonat ialah CO₃^2-. Pilih formula kimia yang betul bagi kalsium karbonat.

• Ca(CO₃)₂

• CaCO₃

• Ca₂CO₃

• Ca₃(CO₃)₂

Which of the following chemical formulae is correct?

Antara formula kimia berikut, yang manakah betul?

• Li₂O

• KBr₂

• Al₃Cl

• MgNO₃

Which of the following is a compound?

• Co
• O₂
• C
• CO₂

Tags

NGSS.MS-PS1-1

Ag(NO₃)₂ + HCl --> HNO₃ + AgCl₂
What are the reactants in the above reaction?

• Ag(NO₃)₂ + HCl
• HNO₃ + AgCl₂
• HCl + HNO₃
• Ag(NO₃)₂ + AgCl₂

Zinc reacts with Oxygen to form Zinc Oxide. The properties of Zinc Oxide are most likely -

• similar to both Zinc and Oxygen

• similar only to Zinc

• similar only to Oxygen

• different from Zinc or Oxygen

What is the correct way to write the formula for the model of this compound?

• 2H₂0

• 2H₂O

• 2HO₂

• H₂O₂

What state of matter is this substance?

• solid

• liquid

• gas

• aqueous

Tags

NGSS.HS-PS1-3

NGSS.HS-PS1-5