Write the balanced chemical equation for the following and identify the type of reaction in each case.
$(a)$ Potassium bromide $(aq)$ $+$ Barium iodide$(aq)$ $\rightarrow$ Potassium iodide$(aq)$ $+$ Barium bromide$(s)$
$(b)$ Zinc carbonate$(s)$ $\rightarrow$ Zinc oxide$(s)$ $+$ Carbon dioxide$(g)$
$(c)$ Hydrogen$(g)$ $+$ Chlorine$(g)$ $\rightarrow$ Hydrogen chloride$(g)$
$(d)$ Magnestum $(s)$ $+$ Hydrochloric acid$(aq)$ $\rightarrow$ Magnesium chloride$(aq)$ $+$ Hydrogen $(g)$
$(a)$ $2KB{{r}_{(aq)}}+Ba{{I}_{2(aq)}}\,\to \,2K{{I}_{(aq)}}\,+\,BaB{{r}_{2(s)}}$; Double displacement reaction
$(b)$ $ZnCO _{3(s)} \longrightarrow ZnO _{( s )}+ CO _{2( g )} ;$ Decomposition reaction
$(c)$ $H _{2(g)}+ Cl _{2(g)} \longrightarrow 2 HCl _{( g )} ;$ Combination reaction
$(d)$ $Mg _{(s)}+2 HCl _{(aq)} \longrightarrow MgCl _{2(a q)}+ H _{2(g)}$ ; Displacement reaction
Why is respiration considered an exothermic reaction ? Explain.
Why does the colour of copper sulphate solution change when an iron nail is dipped in it ?
What does one mean by exothermic and endothermic reactions ? Give examples.
Write the balanced chemical equations for the following reactions.
$(a)$ Calcium hydroxide $+$ Carbon dioxide $\rightarrow$ Calcium carbonate $+$ Water
$(b)$ Zinc $+$ Silver nitrate $\rightarrow$ zinc nitrate $+$ Silver
$(c)$ Aluminium $+$ Copper chloride $\rightarrow$ Aluminium chloride $+$ Copper
$(d)$ Barium chloride$+$ Potassium sulphate $\rightarrow$ Barium sulphate $+$ Potassium chloride
Oil and fat containing food items are flushed with nitrogen. Why ?