Question

13.2 Which of the following is an example of a chemical change? (a) Mixing salt and water (b) Heating candle wax (c) Adding lemon to milk (d) Adding water to milk 13.3 Consider the following actions: (a) 1 g of dry blue CuSo, powder is dissolved in a beaker containing water. (b) An iron blade is dropped in this solution, which results in the formation of a green-coloured solution. These two steps are (0) a chemical and a physical change, respectively. (ii) a physical and a chemical change, respectively. 13.4 Justify the following changes as physical or chemical: (a) Beating an egg (b) Separating sand from gravel (c) Frying a samosa (d) Chopping an onion (e) Neutralising soil (f) Milk turning sour (g) Making bread (h) Cooling carbon dioxide to make dry ice 13.5 Which of the following is/are true when we bake a cake? (a) Its state changes from liquid to semi-solid. (b) Its colour changes. (c) Its taste changes. (d) The change cannot be reversed. Choose the best option: (i) (a) and (b) are correct. (ii) (b) and (c) are correct. (iii) (a), (c), and (d) are correct. (iv) All are correct 13.6 Compare physical changes with chemical changes and list two examples of each. 88 LEAD SCHO​

Answer 1

Answer:

option c

adding lemon to milk because it will change the product'

Explanation: