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Question 1
How does increasing the concentration of hydrochloric acid affect its reaction rate with zinc metal chips?
Correct Answer:
It increases the reaction rate by increasing the frequency of collisions between reactant particles.
Question 2
Consider the reversible exothermic synthesis of ammonia: N2(g) + 3 H2(g) 2 NH3(g) + Heat. If the temperature of the equilibrium system is increased, how will the reaction respond according to Le Chatelier's principle?
Correct Answer:
The equilibrium will shift to the left (toward reactants N2 and H2) to absorb added thermal energy.
Question 3
A 1,200-kg car traveling east at 15 m/s collides head-on with an identical 1,200-kg car traveling west at 15 m/s. The cars lock bumpers and come to a complete stop. What was the total vector momentum of the system right before the collision?
Correct Answer:
0 kg·m/s.
Question 4
During protein synthesis, a cell transcribes a DNA sequence 3'-TAC GGC TTA-5' into messenger RNA. What is the complementary sequence of the mRNA transcript produced?
Correct Answer:
5'-AUG CCG AAU-3'.
Question 5
How do biological enzymes increase the rate of metabolic reactions inside living cells?
Correct Answer:
By lowering the activation energy barrier required for the reaction to occur.
Question 1
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About this Exam

Prepare with the Washington Comprehensive Assessment of Science (WCAS) Grade 11 Practice Questions - Washington Comprehensive Assessment of Science - Grade 11 Exam practice quiz. This question bank includes 100 questions covering water, reaction, temperature, engineers, and blood. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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Washington Comprehensive Assessment of Science (WCAS) Grade 11 Practice Questions - Washington Comprehensive Assessment of Science - Grade 11 Exam

This practice set contains 100 questions from the matching question bank and focuses on water, reaction, temperature, engineers, and blood. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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