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 ratio of these elements.

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What does NaCl represent?

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NaCl represents sodium chloride, commonly known as table salt, which is a compound made of sodium (Na) and chlorine (Cl) in a 1:1 ratio.

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How many atoms are in a molecule of water (H2O)?

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A molecule of water (H2O) contains 3 atoms: 2 hydrogen (H) atoms and 1 oxygen (O) atom.

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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 is the chemical formula for methane?

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The chemical formula for methane is CH4, indicating it consists of one carbon (C) atom and four hydrogen (H) atoms.

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How many sodium (Na) atoms are in 6NaCl?

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There are 6 sodium (Na) atoms in 6NaCl.

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How many hydrogen atoms are in 5H2O?

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There are 10 hydrogen atoms in 5H2O.

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What is a chemical change?

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A chemical change is a process where substances transform into different substances with new chemical properties, such as rusting iron or burning wood.

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What is the significance of subscripts in a chemical formula?

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Subscripts in a chemical formula indicate the number of atoms of each element in a molecule. For example, in H2O, the '2' indicates there are two hydrogen atoms.

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What does the term 'molecule' mean?

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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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