JaanoQ Questions

Balance the following chemical equations: a. \(HNO_3+Ca(OH)_2 \rightarrow Ca(NO_3)_2+H_2O\) b. \(NaOH+H_2SO_4 \rightarrow Na_2SO_4+H_2O\) c. \(NaCl+AgNO_3 \rightarrow AgCl+NaNO_3\) d. \(BaCl_2+H_2SO_4 \rightarrow BaSO_4+HCl\)

Translate the following statements into chemical equations and then balance them. a. Hydrogen gas combines with nitrogen to form ammonia.b. Hydrogen sulphide gas burns in air to give water and sulphur dioxidec. Barium chloride reacts with aluminium sulphate to give aluminium chloride and a precipitate of barium sulphate.d. Potassium metal reacts with water to give

What is a balanced chemical equation? Why should chemical equations be balanced?

What happens when dilute hydrochloric acid is added to iron filings? Tick the correct answer. a. Hydrogen gas and iron chloride are produced.b. Chlorine gas and iron hydroxide are produced.c. No reaction takes place,d. Iron salt and water are produced.

\(Fe_2O_3+1Al \rightarrow Al_2O_3+2Fe\) The above reaction is an example of a _______________ Options: a. Combination reaction b. Double displacement reaction c. Decomposition reaction d. Displacement reaction

Which of the statements about the reaction below are incorrect? \[2PbO_{(s)} + C_{(s)} \rightarrow 2Pb_{(s)} + CO_{2(g)}\] a. Lead is getting reduced. b. Carbon dioxide is getting oxidised. c. Carbon is getting oxidised. d. Lead oxide is getting reduced Options i. (a) and (b) ii. (a) and (c) iii. (a),(b) and (c) iv. all  

Identify the substances that are oxidised and the substances that are reduced in the following reactions i. \[4Na_{(s)}+O_{2(g)} \rightarrow 2Na_2O_{(s)}\] ii. \[CuO_{(s)}+H_{2(g)} \rightarrow Cu_{(s)}+H_2O_{(l)}\]

Give an example of a double displacement reaction other than the one given in Activity 1.10.

Why does the color of copper sulphate solution change when an iron nail is dipped in it?

Why is the amount of gas collected in one of the test tubes in Activity 1.7 double of the amount collected in the other? Name this gas.