physics , Chemistry

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What is the periodic table?

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A tabular arrangement of chemical elements, organized by increasing atomic number, where elements with similar properties are grouped together.

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What are elements?

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Pure substances that cannot be broken down into simpler substances by chemical means, found on the periodic table.

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What determines the chemical reactivity of an element?

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The number of valence electrons in the outer shell of an atom.

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What is a chemical change?

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A process where substances combine or break apart to form new substances, often accompanied by energy changes.

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What is a physical property?

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Characteristics of a substance that can be observed or measured without changing its chemical identity, such as color, melting point, and density.

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What is a chemical reaction?

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A process that leads to the transformation of one set of chemical substances to another, often indicated by the formation of gas, color change, or temperature change.

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What is the significance of valence electrons?

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Valence electrons determine how an element will react chemically with other elements.

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What is the difference between a compound and an element?

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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 together.

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What is the role of enzymes in digestion?

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Enzymes are biological catalysts that speed up chemical reactions, including the breakdown of food molecules in the digestive system.

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What is the state of matter?

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The distinct forms that different phases of matter take on, typically solid, liquid, gas, and plasma.