Q4 -- Science 10 -- WW 4

How does the principle of conservation of mass apply to a chemical reaction?

• Mass is created during the reaction.

• Mass is destroyed during the reaction.

• Mass is conserved; the total mass of reactants equals the total mass of products.

• Mass is converted into energy.

Why is it important to balance chemical equations in accordance with the conservation of mass?

• To ensure the reaction proceeds faster.

• To accurately represent the quantities of reactants and products.

• To create new elements during the reaction.

• To increase the mass of the products.

Which factor is most commonly manipulated in refrigeration to preserve food?

• pH levels

• Temperature

• Surface area

• Catalyst

How do catalysts affect the rate of chemical reactions in industrial production?

• They slow down the reaction.

• They increase the surface area of reactants.

• They speed up the reaction without being consumed.

• They change the pH of the reactants.

How does increasing the surface area of reactants affect the rate of chemical reactions in materials production?

• It slows down the reaction.

• It has no effect on the reaction rate.

• It speeds up the reaction.

• It changes the pH of the reactants.

Which of the following is a characteristic of lipids?

• They are soluble in water.

• They are used for long-term energy storage.

• They contain genetic information.

• They are composed of amino acids.

Which of the following is a common monosaccharide found in fruits?

• Sucrose

• Maltose

• Lactose

• Fructose

Which of the following is a primary function of cellulose in plants?

• Providing structural support

• Storing energy

• Catalyzing biochemical reactions

• Storing genetic information

Which of the following best describes the structure of DNA?

• A double-stranded helix

• A single-stranded helix

• A linear chain of amino acids

• A branched chain of glucose molecules

Which nitrogenous base is found in RNA but not in DNA?

• Adenine

• Thymine

• Cytosine

• Uracil