Chemistry EASE 3

1. What colour is universal indicator when the solution is neutral?

• Green
• Blue
• Pink
• Purple

2. What is the name of reaction between an acid and an alkali that produces salt and water?

• acidication

• fermentation

• alkalisation

• neutralisation

3. Which of the following is/are formed when magnesium reacts with hydrochloric acid?

• Magnesium chloride

• Magnesium carbonate

• Hydrogen

• Magnesium chloride and hydrogen

4What gas is always produced when a metal reacts with water?

• Carbon monoxide

• Hydrogen

• Carbon dioxide

• Oxygen

5. Which of the following is a physical change?

• Fireworks going off

• Rotting of an apple

• Freezing of water

• Burning of wood

6. Change in pH is one indicator of chemical reaction. Which action from below can be identified as chemical reaction according to this indicator?

• Burning paper

• Mixing lemon extract and baking soda

• Reddish Copper metal turns into greenish

• Dissolving table salt

7. Formation of precipitation can be seen as a sign of chemical reaction. Which of the following can be identified as chemical reaction by that observation?

• Reaction of Iron and acidic solution

• Reaction of Carbon dioxide and limewater

• Mixing vinegar and baking soda

• Reaction of Sodium metal and water

8. When Hydrochloric acid and Sodium hydroxide solutions are mixed, the water becomes warmer. What are the signs of chemial reaction that can be observed in that case?

• Production of gas and production of precipitation

• Production of heat and change in pH

• Reactant disappears and formation of precipitation

• Production of gas and change in color

9. From options below, which one does NOT indicate a chemical reaction?

• Color change when copper turns greenish after a couple of years

• Bubbles forming on boiling water

• Precipitation formed when two solutions are mixed

• Heat produced from burning wood

10. Adel wanted to compare the effectiveness of popular antacid brands in the market. She compared them by measuring how many grams of each antacid is needed to neutralize an acidic solution with pH = 1. The table below summarizes her results. Which antacid is the most effective in neutralizing acid?

• W

• X

• Y

• Z