Q: Which of the following equations correctly represents the Law of Conservation of Mass for the reaction: $$2H_2 + O_2$ \rightarrow 2H_2O$$?

$$\text{Mass of } H_2$ + \text{Mass of } O_2$ = \text{Mass of } H_2O$$

Question 1

Which of the following best describes the difference between a scientific law and a scientific theory?

Accepted Answer

A scientific law is a summary of observed behavior, while a scientific theory provides an explanation for that behavior.

Question 2

A student is designing an experiment to test the effect of temperature on the rate of a chemical reaction. Which step of the scientific method is the student performing when they make a prediction about the outcome?

Accepted Answer

Formulating a hypothesis

Question 3

Which piece of laboratory glassware would be most appropriate for measuring exactly 25.0 mL of a liquid for a chemical reaction?

Accepted Answer

Graduated cylinder

Question 4

A laboratory spill involves a corrosive chemical. According to the RAMP safety framework, what is the first action you should take?

Accepted Answer

Assess the risks and alert others in the area.

Question 5

Which of the following is an example of the Law of Conservation of Mass?

Accepted Answer

The total mass of reactants equals the total mass of products in a closed system.

Question 6

You are tasked with preparing a safety plan for a new chemical. Which document should you consult to find information about hazards and safe handling procedures?

Accepted Answer

Safety Data Sheet (SDS)

Question 7

A student observes that a metal reacts with acid to produce bubbles. Which part of the scientific method does this represent?

Accepted Answer

Observation

Question 8

Which of the following best describes a hypothesis?

Accepted Answer

A tentative explanation that can be tested by experiments.

Question 9

A chemical is labeled as 'combustible.' What does this indicate about the chemical?

Accepted Answer

It can catch fire and burn easily under certain conditions.

Question 10

Which laboratory equipment would you use to most accurately determine the mass of a solid sample?

Accepted Answer

Balance

Question 11

A student is asked to design an experiment to test a new hypothesis. Which of the following is the best example of a controlled variable?

Accepted Answer

A variable kept constant to ensure a fair test.

Question 12

Which of the following is NOT a recommended safety practice when working with hazardous chemicals in the laboratory?

Accepted Answer

Eating or drinking in the laboratory.

Question 13

A student mixes two clear solutions and observes the formation of a white solid. Which term best describes the white solid?

Accepted Answer

Product

Question 14

Which of the following equations correctly represents the Law of Conservation of Mass for the reaction: $$2H_2 + O_2$ \rightarrow 2H_2O$$?

Accepted Answer

$$	ext{Mass of } H_2$ + 	ext{Mass of } O_2$ = 	ext{Mass of } H_2O$$

Question 15

Which of the following best describes the purpose of the RAMP safety framework in the laboratory?

Accepted Answer

To systematically identify and minimize laboratory risks.

Question 16

A student needs to rinse their eyes after a chemical splash. Which safety equipment should they use?

Accepted Answer

Eye wash station

Question 17

Which of the following is an example of applying technology in chemistry?

Accepted Answer

Using a balance to measure mass.

Question 18

A student is asked to choose the most precise tool to measure 10.0 mL of a liquid. Which should they select?

Accepted Answer

Graduated cylinder

Question 19

Which of the following statements about atomic theory is correct?

Accepted Answer

Atoms are the basic building blocks of matter.

Question 20

A student reads the SDS for a chemical and sees the word 'hazard.' What does this term refer to?

Accepted Answer

The inherent property of a substance that makes it dangerous.

1: Introduction to Chemistry: Scientific Method, Lab Safety, and Key Concepts

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