Question

WP 1. Steel was first used by humans as a substitute for stone in the Neolithic period. 2. Gold is the element used in developing photographic negatives. 3. Lime juice contains citric acid. 4. Substances such as caustic soda and baking soda are bases, chemical opposites of acids. 5. Paper chromatography is the method used to separate chemical mixtures on the basis of colour. 6. Glycogen is the common name for ethylene glycol. 7. Air is an element. Nitrous oxide is also known as laughing gas. 9. Rock salt is a mixture of common salt and artificial food colouring. 10. The molecules in a gas move in only one direction. answer in true or false​

Answer 1

Explanation:

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