Question

2. In a closed system, why is the study of chemical equilibrium important? (1 point)
○ It ensures that the products are always in excess of reactants.
○ It makes the products form faster than the reactants.
○ It allows scientists to observe how matter behaves without external interference.
○ It allows the system to freely exchange matter with its surroundings.

3. Which of the following best describes a dynamic chemical system at equilibrium? (1 point)
○ Reactants and products are constantly breaking apart and reforming.
○ Reactants are completely converted to products.
○ The reaction proceeds only in one direction.
○ Reactants and products are no longer changing.

4. According to Le Chatelier’s principle, what happens when a system at equilibrium experiences a change? (1 point)
○ The system reaches a new equilibrium without shifting.
○ The system will always shift to form more reactants.
○ The system stops reacting.
○ The system shifts in the direction to oppose the change and establish a new equilibrium.

5. A misconception about Le Chatelier’s principle is that the concentrations of reactants and products are always equal at equilibrium. What is the correct clarification? (1 point)
○ The concentrations of reactants and products are equal only if the system is in a closed container.
○ The concentrations of reactants and products must always be equal.
○ The system will reach equilibrium with equal concentrations of reactants and products only in a closed system.
○ The rates of the forward and reverse reactions are always equal, but the concentrations of reactants and products are usually different.

6. In an exothermic reaction, how is energy considered in the chemical equation? (1 point)
○ Energy is not part of the reaction.
○ Energy is considered a catalyst.
○ Energy is considered a product.
○ Energy is considered a reactant.

7. What is the primary role of chemical technology? (1 point)
○ To regulate the release of harmful chemicals into the environment.
○ To prevent deforestation in various ecosystems.
○ To develop products for the chemical industry using methods and tools from chemistry.
○ To create machines that extract raw materials from the environment.

8. What is a major positive impact of the chemical industry? (1 point)
○ The development of medicines and essential products for people.
○ Increased deforestation for farming.
○ The destruction of ecosystems through mining.
○ The release of harmful chemicals into the environment.

9. Which goal do all environmental regulations for industry serve? (1 point)
○ to protect people and the environment
○ to limit industrial activities in all industries
○ to reduce greenhouse gas emissions

10. Why is it difficult to make vaccines for viruses? (1 point)
○ Viruses can only be destroyed by antibiotics, not vaccines.
○ Vaccines work by killing the virus, which is too dangerous.
○ Viruses are too large to create effective vaccines.
○ Viruses change rapidly, making it hard to target them with one vaccine.

11. What happens when a forest is cleared for farming? (1 point)
○ It leads to a monoculture, where a single crop is grown, reducing biodiversity.
○ It increases the number of tree species in the area.
○ It helps preserve the natural ecosystem and its balance.
○ It decreases soil erosion and stabilizes the ecosystem.

12. What contributes to the formation of acid rain? (1 point)
○ Compounds of carbon, nitrogen, and sulfur combining with water.
○ The increase of biodiversity in forest ecosystems.
○ The combustion of fossil fuels without releasing harmful chemicals.
○ The release of carbon dioxide by trees.

13. What is the advantage of fiber-optic cables over copper wires? (1 point)
○ (Answer choices not visible in the image)

Answer 1

2. It allows scientists to observe how matter behaves without external interference.

3. Reactants and products are constantly breaking apart and reforming.

4. The system shifts in the direction to oppose the change and establish a new equilibrium.

5. The rates of the forward and reverse reactions are always equal, but the concentrations of reactants and products are usually different.

6. Energy is considered a product.

7. To develop products for the chemical industry using methods and tools from chemistry.

8. The development of medicines and essential products for people.

9. to protect people and the environment

10. Viruses change rapidly, making it hard to target them with one vaccine.

11. It leads to a monoculture, where a single crop is grown, reducing biodiversity.

12. Compounds of carbon, nitrogen, and sulfur combining with water. (Primarily sulfur and nitrogen oxides in combustion combine with water to form acid rain.)

13. Fiber-optic cables transmit data at much higher bandwidths with lower signal loss and are immune to electromagnetic interference compared with copper wires.