Chemical Formulas

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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 substance using symbols for its constituent elements and numbers to indicate the quantity of each element.

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What does the subscript in a chemical formula indicate?

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The subscript in a chemical formula indicates the number of atoms of the element present in one molecule of the compound.

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NGSS.MS-PS1-1

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What is the chemical formula for methane?

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The chemical formula for methane is CH₄, indicating one carbon atom and four hydrogen atoms.

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How do you determine the total number of atoms in a chemical formula?

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To determine the total number of atoms, add the subscripts of all elements in the formula.

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What is the significance of the coefficient in a chemical formula?

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The coefficient indicates the number of molecules of the compound present.

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What is the chemical formula for water?

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The chemical formula for water is H₂O, indicating two hydrogen atoms and one oxygen atom.

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NGSS.MS-PS1-1

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How many atoms are in one molecule of carbon dioxide (CO₂)?

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There are three atoms in one molecule of carbon dioxide: one carbon atom and two oxygen atoms.

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NGSS.MS-PS1-1

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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 only 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 does the term 'molecule' refer to?

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A molecule is a group of two or more atoms bonded together, representing the smallest fundamental unit of a chemical compound.

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How many different kinds of elements are there in the periodic table?

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There are currently 118 different kinds of elements in the periodic table.