Science Week 2023 - Chemistry

Which subatomic particle is responsible for the identity of an element?

• Proton

• Neutron

• Electron

• Photon

What type of bond involves the transfer of electrons from one atom to another?

• Metallic Bond

• Covalent Bond

• Ionic Bond

• Hydrogen

What is the approximate molar mass of water (H₂O)?

• 18 g/mol

• 20 g/mol

• 22 g/mol

• 24 g/mol

Which of the following is the strongest acid?

• Acetic acid (CH₃COOH)

• Hydrochloric acid (HCl)

• Citric acid (C₆H₈O₇)

• Carbonic acid (H₂CO₃)

What is the main function of a catalyst in a chemical reaction?

• Absorb heat

• Slow down the reaction

• Increase reaction rate without being consumed

• Converts products into reactants

Which state of matter has a definite shape and volume?

• Gas

• Liquid

• Solid

• Plasma

What does the term "pH" measure in a solution?

• Pressure and heat

• Particle hardness

• Precipitation and humidity

• Power of hydrogen ion concentration

Which element is a noble gas and often used in lighting due to its glow when electrically charged?

• Oxygen
• Nitrogen
• Neon
• Hydrogen

What type of reaction involves the combination of two or more substances to form a single product?

• Decomposition

• Combustion

• Sublimation

• Synthesis

Which gas is commonly used in fire extinguishers due to its lack of reactivity?

• Oxygen
• Hydrogen
• Carbon Dioxide
• Nitrogen