BM1 Review - Chemical Formulas & Elements vs Compounds

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What is a chemical formula?

Back

A chemical formula is a way of expressing the composition of a substance using symbols for its constituent elements and numbers to indicate the ratio of atoms.

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What is the difference between an element and a compound?

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An element is a pure substance that cannot be broken down into simpler substances, while a compound is a substance formed when two or more elements chemically bond together.

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What does a subscript in a chemical formula indicate?

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A subscript indicates the number of atoms of the element in one molecule of the compound.

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How many atoms of hydrogen are in H2O?

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There are 2 atoms of hydrogen in H2O.

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How many atoms of oxygen are in H2O?

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There is 1 atom of oxygen in H2O.

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What is the chemical formula for glucose?

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The chemical formula for glucose is C6H12O6.

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How many different elements are in C6H12O6?

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There are 3 different elements in C6H12O6: carbon (C), hydrogen (H), and oxygen (O).

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What is a coefficient in a chemical equation?

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A coefficient is a number placed in front of a chemical formula to indicate how many molecules or moles of that substance are present.

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How many sodium atoms are in 6NaCl?

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There are 6 sodium atoms in 6NaCl.

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What is the total number of atoms in one molecule of H2SO4?

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There are 7 atoms in one molecule of H2SO4 (2 H, 1 S, 4 O).