Fall 2024 Semester Science Exam Review

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What is a compound?

Back

A compound is a substance formed when two or more elements are chemically bonded together.

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What is the primary purpose of wearing safety goggles in a laboratory?

Back

To protect eyes from chemical splashes.

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What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means.

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How are elements represented?

Back

Elements are represented by symbols, such as H for hydrogen and O for oxygen.

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What are the characteristics of a compound?

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1. Compounds are made from two or more elements. 2. A compound is a pure substance. 3. Compounds are represented by a chemical formula.

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What is a chemical formula?

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A chemical formula is a way of expressing the composition of a compound using symbols and numbers, e.g., H2O for water.

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What is the difference between an element and a compound?

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An element is a pure substance made of one type of atom, while a compound is made of two or more different types of atoms chemically bonded.

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What does it mean for a substance to be pure?

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A pure substance has a uniform and definite composition, meaning it contains only one type of particle.

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What is a mixture?

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A mixture is a combination of two or more substances that are not chemically bonded and can be separated by physical means.

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What is the significance of chemical symbols?

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Chemical symbols provide a shorthand way to represent elements and compounds in chemical equations.