Science Practice Quiz 4

Q1.In the reaction CO(g) + 2H2(g) → CH3OH(l), what specific reaction condition is indicated above the arrow?

A. Temperature B. Catalyst C. Pressure D. Concentration

Q2.According to the provided text, what fundamental change occurs during a chemical reaction?

A. Atoms of one element transform into atoms of another element. B. Atoms disappear from the mixture or appear from elsewhere. C. Atoms break and make bonds to produce new substances. D. Atoms increase their mass and change their atomic number.

Q3.Which of the following best defines a combination reaction?

A. A reaction where a single reactant breaks down into two or more products. B. A reaction where two compounds exchange ions to form new compounds. C. A reaction where a single product is formed from two or more reactants. D. A reaction where a more reactive element displaces a less reactive element from its compound.

Q4.What is the common name for calcium oxide, as mentioned in the context of the combination reaction?

A. Slaked lime B. Quick lime C. Calcium hydroxide D. Limestone

Q5.When calcium oxide reacts vigorously with water, what is the product formed, commonly known as slaked lime?

A. Calcium carbonate B. Calcium chloride C. Calcium hydroxide D. Calcium sulphate

Q6.What significant observation is made regarding the temperature change when calcium oxide reacts with water?

A. The temperature decreases significantly. B. The temperature remains unchanged. C. A large amount of heat is released. D. A large amount of heat is absorbed.

Q7.What is the chemical formula for slaked lime, as provided in the balanced equation?

A. CaO B. H2O C. Ca(OH)2 D. CaCO3

Q8.In the combination reaction described, which of the following is a reactant?

A. Slaked lime B. Heat C. Calcium hydroxide D. Water

Q9.What is the state symbol for calcium oxide (quick lime) in the chemical equation provided for its reaction with water?

A. (l) B. (aq) C. (s) D. (g)

Q10.What is the nature of the reaction between calcium oxide and water?

A. It is a slow and endothermic reaction. B. It is a vigorous and exothermic reaction. C. It is a reversible reaction that absorbs heat. D. It is a decomposition reaction that releases light.

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Science Practice Quiz 4