GCSE Chemistry – Empirical formula

Last updated: 08/06/2020
OCR 21st Century GCSE Science – Combined science foundation Chemicals of the natural environment GCSE Chemistry – Empirical formula

Learning Objectives

-I can deduce empirical formulas of compounds from descriptions of atoms or diagrams

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  1. What is an empirical formula?

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  2. What can be found using the composition of atoms?

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  3. For which type of compounds is the empirical formula used for?

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  4. What should you do if when you find the empirical formula some of your values are not in whole numbers?

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  5. A compound consists of 37%C, 2% H, 19%N and 42%O

     

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  6. A compound consists of C – 81.58%, H – 8.90% and N – 9.52%, work out the empirical formula.

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  7. A compound consists of C – 60%, H – 4.48% and O – 35.53%, work out the empirical formula.

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  8. A compound consists of C – 15.87%, H – 2.57%, N – 18.15% and O – 63.41%, work out the empirical formula.

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