Science Cerdas Cermat Leadership Gr 8

What substance can be found in nail polish remover

• Formaldehyde

• Benzene

• Petroleum

• Acetone

When iron comes into contact with …, it rusts. This process is called …

• Water, Oxidation

• Oxygen, Neutralisation

• Oxygen, Oxidation

• Oxygen, Rusting

What happens when hydrochloric acid is added to magnesium?

• Hydrochloric Acid + Magnesium ---> Magnesium chloride + Oxygen

• Hydrochloric Acid + Magnesium ---> Magnesium chloride + Water

• Hydrochloric Acid + Magnesium ---> Magnesium chloride + Hydrogen (Liquid)

• Hydrochloric Acid + Magnesium ---> Magnesium chloride + Hydrogen (Gas)

What is rate of reaction?

• Product of a reaction

• Speed of a reaction

• Temperature of a reaction

• Effects of a reaction

  (Bubbles,Change of state or color)

How can we increase the rate of reaction?

• Decreasing the temperature

• Lower the concentration

• Adding an inhibitor

• Increasing the surface area

 How can galvanizing Iron with zinc prevent it from rusting?

• The layer of zinc contains oil that prevents oxygen from reaching the iron

• The layer of zinc reacts with the iron and create molecules called Debilis ferriumine

• The layer of zinc prevents oxygen from reaching the iron

• The layer of zinc prevents any molecules from reacting with the iron 

What are the 5 Layers of the Earth’s Atomosphere (Closest to Furthest)

• Stratosphere,

  Troposphere, 

  Mesosphere,

  Thermosphere,

  Exosphere.

• Troposphere, Stratosphere, Thermosphere, Mesosphere,

  Exosphere.

• Stratosphere,

  Troposphere, 

  Thermosphere,

  Mesosphere,

  Exosphere.

• Troposphere, Stratosphere, Mesosphere,

  Thermosphere,

  Exosphere.

 What color diamond will be created if some of the carbon is replaced with boron?

• Green

• Blue

• Yellow

• Red

Which of these is the correct symbol equation for copper oxide + sulfuric acid? 

• CuO + SO4H2 —--> CuOSO4 + H2

• CuO + HSO4 —--> CuSO4 + H

• CuO + H2SO4 —--> CuSO4 + H2O

• CuO + H2SO4 —--> CuSO4 + CO2

Why do people use paper chromatography in food dyes

• So we can test what color it is made out of

• So we can test if its actually a food dye or a toxic chemical

• So we can test how strong and bright the food dye is

• So we can test if it contains toxic substances