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  1. Measurements may be accurate, meaning that the measured value is the same as the true value; they may be precise, meaning that multiple measurements give nearly identical values (i.e., reproducible results); they may be both accurate and precise; or they may be neither accurate nor precise.

  2. Chemical formulae of compounds. Chemists use symbols and formulae to represent elements, ions and compounds. Word equations and balanced chemical equations model the changes that happen in ...

  3. Learn about elements, compounds and mixtures in this KS3 Chemistry guide from BBC Bitesize.

  4. Examples of triviality. Example 1. Trivial Solution. Consider the formula x + 3 equals x + 3. This equation has a simple solution: x = any real value. This is because subtracting x from both sides of the equation results in 3 = 3, which is always true regardless of x’s value.

  5. a. mixture. consists of two or more different substances, not chemically joined together. The substances in a mixture can be elements, or compounds, or both. Being part of a mixture does not change...

  6. Oct 24, 2020 · In chemistry, a compound is a substance made of two or more elements chemically bonded to each other in a fixed ratio. The chemical bonds between atoms of elements involve a transfer or sharing of valence of electrons.

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  8. All matter has physical and chemical properties. Physical properties are characteristics that scientists can measure without changing the composition of the sample under study, such as mass, color, and volume (the amount of space occupied by a sample).

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