What is the definition of chemistry?

The study of matter and the changes it undergoes.

The study of celestial bodies and their movements.

The study of living organisms and their functions.

The study of Earth's physical structure and substances.

Distinguish between physical and chemical properties. Give one example of each.

Physical property: can be observed without changing the substance (e.g., melting point). Chemical property: describes the ability to undergo a chemical change (e.g., flammability).

Physical property: always involves a chemical reaction (e.g., rusting). Chemical property: can be observed without changing the substance (e.g., boiling point).

Physical property: describes the ability to react with acids (e.g., corrosion). Chemical property: is the color of the substance (e.g., blue).

Physical property: is the ability to burn (e.g., flammability). Chemical property: is the melting point (e.g., 0°C for ice).

What is the difference between a hypothesis, a scientific theory, and a scientific law?

A hypothesis is a testable prediction, a theory is a well-substantiated explanation, and a law is a statement based on repeated experimental observations.

A hypothesis is a proven fact, a theory is a guess, and a law is a random observation.

A hypothesis is a law, a theory is a prediction, and a law is an explanation.

A hypothesis is an untestable idea, a theory is a single experiment, and a law is a theory that has been proven.

Explain the difference between accuracy and precision.

Accuracy is how close a measurement is to the true value. Precision is how close repeated measurements are to each other.

Accuracy is how close repeated measurements are to each other. Precision is how close a measurement is to the true value.

Accuracy and precision both mean the same thing in measurement.

Accuracy is only important in science, while precision is only important in mathematics.

What is meant by 'significant figures'?

The digits in a measurement that are known with certainty plus one estimated digit.

The total number of digits in any number.

Only the digits before the decimal point in a measurement.

The digits that are always zero in a measurement.

What is dimensional analysis used for?

To convert units or solve problems using conversion factors.

To measure the mass of an object.

To determine the boiling point of a substance.

To calculate the speed of light.

What is the correct value to report when reading a measurement from a scientific instrument with incremental markings?

The value should include all certain digits plus one estimated digit.

The value should include only the estimated digit.

The value should include only the certain digits, no estimated digit.

The value should include two estimated digits.

CHEM 1021 – Exam 1 Information and Topic List Summer 2025

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CHEM 1021 – Exam 1 Information and Topic List Summer 2025

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Chemistry

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Fill in the blank: 1 pound (lb) is equal to ____ grams (g).

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CHEM 1021 – Exam 1 Information and Topic List Summer 2025

76 questions

Fill in the blank: The equation to convert Fahrenheit to Celsius is Tc = (Tf - __ ) / 1.8.

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Fill in the blank: 1 kilometer (km) is equal to ____ miles.

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