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PNG Grade 12 Past (2021) Chemistry Exam, How to work out question 38 answer. Question 38 is about electrochemical cells. We explain how to determine and write electrochemical or redox equations for the two types of electrochemical cells; Galvanic and Electrolytic cells.

Density if mass divide by volume. Density of water is 1g/cm3. Anything with density more than density of water (1g/cm3) will sink and less than 1g/cm3 will float. Here salt is added to water to make the egg once sinked egg to float again. How does salt change the density? Let us know in comment.

When battery is placed inside a cup of salt solution, this result was obtained. Can explain what you see. Leave a comment to let us know.

When salt is added to water with egg at the bottom of the container, it results in ??. Explain what you see. Let us know what you think.