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

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Count the subscripts in the formula. If there is no subscript, it is understood to be 1.

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What does the subscript in a chemical formula represent?

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The subscript indicates the number of atoms of the element that are present in one molecule of the compound.

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In the formula CH₃CH₂Br, how many hydrogen atoms are there?

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There are 5 hydrogen atoms.

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What is the chemical formula for sulfuric acid?

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The chemical formula for sulfuric acid is H₂SO₄.

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How many atoms of sulfur are in H₂SO₄?

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There is 1 atom of sulfur in H₂SO₄.

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What is the total number of atoms in the amino acid alanine (C₃H₇NO₂)?

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There are 13 atoms in each molecule of alanine.

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What elements are present in the amino acid with the formula C₅H₁₁NO₂S?

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The elements present are Carbon (C), Hydrogen (H), Nitrogen (N), Oxygen (O), and Sulfur (S).

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How many different elements are in the formula C₅H₁₁NO₂S?

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There are 5 different elements.

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What is the significance of the chemical formula in chemistry?

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Chemical formulas provide essential information about the composition and structure of substances, which is crucial for understanding chemical reactions.

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