STEM Week 2 Challenge

If you want to make a diamond, what would you choose as raw material?

• Pencil
• Rock
• Pan
• Water

Answer explanation

Explanation for the answer (optional)

Which gas is produced during photosynthesis?

• Carbon dioxide
• Oxygen
• Nitrogen
• hydrogen
• Methane

Which type of reaction releases heat?

• Endothermic
• Displacement
• Decomposition
• Neutralization
• Exothermic

What happens when you cool water vapor to 0 degree?

• Condensation
• Sublimation
• Freezing
• Evaporation

Which pH indicates lemon juice?

• 2
• 7
• 9
• 12

What is the conversion factor between km/hr and m/s ?

• 15/8
• 18/5
• 5/18
• 8/15
• 1

When an inelastic collision occurs, the total kinetic energy of the colliding bodies…

• increase
• decrease
• remain constant
• increase then decrease
• decrease then increase

A student added Cu, Fe, Ag, Na to a test tube with HCl, what is the final colour of the solution?

• green
• blue
• colourless
• pink

In a room, each person shakes hands with everyone else once. If there are 10 people, how many total handshakes happen?

• 45
• 50
• 90
• 100
• 110

If 2^x=16, what is the value of 2^x+1?

• 8
• 16
• 32
• 40
• 48