(Worksheet 1) ques no. 10

(Worksheet 1) ques no. 10 CHEMISTRY wo rksheet-l QI What are the characteristics of chemical reactions? 02 V•le need to balance a chemical equationl Justim 03 Write the chemical equation of the reaction in which the following changes have taken place with an example of each: a) Charwe in Color. b) Chare in C) For Of 04. State the type of chemical reactions that place in the following. a) Mag wire iS burnt in air _ b) Electric is passed thrcaagh water. Ammonia and Hydrogen Chloride gases are mixed. QS Describe an activity to observe what happens when water is added to the quick lime taken in a beaker _ State two important observations and name the type of reactions taking place. Q6 2g of ferrous sulphate crystals æe heated in a dry boiling tim a) Name the Of Chemical reactim taking place. b) Write the chem kal for the 07 Explain the two ways by which food industries prevent rancidity. 08. Write one example each of decomposition reaction carried out with help of a) Electricity b) Heat Light 09. Which products will be obtained when lead nitrate is heated? Write balanced chemical equation for the reaction 010 Why does the color of copper sulphate solution change when an iron nail is dipped in it? Write two observations. Work Sheet -2 QI . Name the acid present in the following. a) 02. 15mL water and 10 mLof sulphuric acid are to be mixed in a beer_ a) State the method that should be folbwed with reason. b) What iS the process called? 03 Define olfactuy indicators. Name two SLBstances which can be used as olfactory indicators. 04 A white colored powder is used by doctors for fractured bones. a) Write chemical and fmrrwla of the b) this white iS mixed with water, a hard mass iS Write balanced for the Change. QS. Explain the action of dilute hydrochloric acid on ribbon and sodium hydroxide. 06 Write the chemical formula of hydrated copper sulphate and anhydrous copper sulphate. Giving an activity illustrate how these are interconvertible. 07 a) Give the constituents of baking pwder, b) Why cake or bread swell on adding powder. Write chemical equation QB How will you test for the gas w•hich is liberated when hydrochloric acid reacts with an

Dear student,
A displacement reaction occurs when an iron nail is dipped in copper sulfate solution because iron lies above the copper in the reactivity series and thus displaces copper from copper sulfate solution. The reaction is as follows:

Fe+CuSO₄------->FeSO₄+Cu

The two observations are as follows:
1)The color of the copper sulfate solution changes from blue to light green because of the formation of FeSO₄ which is light green in color.

2)There is a brown deposition of copper on iron nail due to the displacement of copper from copper sulfate solution.

Regards

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