Q. Burning of methane (CH₄) gives off heat and

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Q. Burning of glucose produces heat and

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Q. Endothermic reactions take place when

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Q. Water with lesser oxygen is known to

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Q. Energy changes in a chemical reaction can be represented through

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Q. In ionic crystals, heat energy is taken in to

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Q. Chemical reaction with oxygen is called

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Q. Reaction of Carbon(s) with O₂(g) is an example of

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Q. Methane (CH₄) is an excellent fuel because

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Q. Non-renewable fossil fuels include

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Q. Upon absorbing heat energy, ionic crystal results into

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Q. Benefits of using small cells could be

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Q. An electrochemical cell in which fuel gives up electrons at one electrode and oxygen gain electrons at another electrode is known as

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Q. In 1748, the first time the word used in connection with electricity was

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Q. By passing the electricity through electrochemical cells, they can be

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Q. The advantage of fuel cell over petrol is its only product

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Q. The estimated range of voltage of ordinary dry cells is

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Q. Nickel cadmium cells are

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Q. The production of energy in fuel cell as compare to petrol engine is considerably

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Q. Cells with a size of the button are used in

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