Exploring Mass and Composition in Chemistry

Which of the following best describes the Law of Conservation of Mass in a chemical reaction?

• Mass is created during a chemical reaction.

• Mass is destroyed during a chemical reaction.

• Mass is neither created nor destroyed during a chemical reaction.

• Mass is converted into energy during a chemical reaction.

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DOK Level 2: Skill/Concept

In a chemical reaction, if 10 grams of hydrogen react with 80 grams of oxygen to form water, what is the total mass of water produced?

• 70 grams

• 80 grams

• 90 grams

• 100 grams

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DOK Level 2: Skill/Concept

Which of the following statements is true according to the Law of Constant Composition?

• A given compound always contains the same elements in the same proportion by mass.

• A given compound can contain varying proportions of elements.

• The composition of a compound depends on the method of preparation.

• The composition of a compound changes with temperature.

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Which step of the scientific method involves forming a hypothesis?

• Observation

• Experimentation

• Data Analysis

• Conclusion

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DOK Level 2: Skill/Concept

Which of the following is an example of the Law of Definite Proportions?

• Water always contains 2 hydrogen atoms and 1 oxygen atom.

• The ratio of hydrogen to oxygen in water can vary.

• Water can be composed of different elements.

• The composition of water changes with pressure.

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DOK Level 2: Skill/Concept

How does the Law of Conservation of Mass apply to a closed system in a chemical reaction?

• The total mass of reactants and products remains constant.

• The mass of reactants is greater than the mass of products.

• The mass of products is greater than the mass of reactants.

• Mass is lost as energy in the system.

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DOK Level 2: Skill/Concept

Which of the following compounds demonstrates the Law of Constant Composition?

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What is the correct sequence of steps in the scientific method?

• Hypothesis, Experimentation, Observation, Conclusion

• Observation, Hypothesis, Experimentation, Conclusion

• Experimentation, Hypothesis, Observation, Conclusion

• Conclusion, Observation, Hypothesis, Experimentation

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DOK Level 2: Skill/Concept

Which of the following best illustrates the application of the Law of Conservation of Mass?

• Burning wood results in ash and gases with a total mass equal to the original wood.

• Burning wood results in ash with a mass less than the original wood.

• Burning wood results in gases with a mass greater than the original wood.

• Burning wood results in energy with no mass.

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Which of the following is an example of a compound with a constant composition?

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DOK Level 2: Skill/Concept