Revison for Chemistry ig

Stalactites in the caves are formed from the following reaction:

Ca(HCO₃)₂→CaCO₃+ CO₂+ H₂O

The equilibrium coefficient for the above chemical reaction is:

• 2,1,1,1

• 1,1,1,1

• 1,2,1,1

• 1,1,2,1

Which image is not an application of evaporation?

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Which country do you want to visit?

What is this phenomenon?

• diffusion

• evaporation

• condensation

• dissolve

Which of the following instruments should be used to measure the exact volume of 15ml of water?

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Which acid is found in the stomach?

• HCl

• HNO_3

• H₂SO₄

• HBr

Which poison was used as a chemical weapon in the World War I, name of this substance means greenish yellow.

• Fluorine

• Bromine

• Iodine

• Chlorine

What makes you happy?

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Which is NOT a chemical change process?

• Fry egg

• Dissolve sugar in water

• Rust forming on an old car

• Concrete setting

This is reaction between iron and copper sulfate. How to speed up the reaction?

• Immerse the test tube in an ice bath

• increase iron bar size

• increase the concentration of copper salt solution

• dilute copper salt solution