PHS Edexcel: Chemistry 2 Mock 2024_F

What would be the molecular formula for this substance?

• C₂H₆

• C2H6

• CH₃

• CH3

What is the molecular formula for carbon dioxide?

• CO₂

• CO

• CO2

• Co₂

What is the molecular formula for methane?

• CH₄

• C₂H₄

• C₂H₆

• C_nH_2n+2

The atomic number of sodium is 11. The atomic mass of sodium is 23.

How many protons does sodium have?

The atomic number of sodium is 11. The atomic mass of sodium is 23.

How many electrons does sodium have?

The atomic number of sodium is 11. The atomic mass of sodium is 23.

How many neutrons does sodium have?

What is an "exothermic" reaction?

• a reaction that gives out heat

• a reaction that takes in heat

• a reaction that explodes

• a reaction that gives off a gas

Over the past few billion years, what has happened to the surface temperature of the Earth?

• stayed the same

• increased

• decreased

Which process reduces the levels of carbon dioxide in the air?

• respiration

• combustion

• photosynthesis

• transpiration

Re-lighting a glowing splint is the test for which gas?

• hydrogen

• oxygen

• chlorine

• carbon dioxide