pls answer it mahababu 29 and thank you fr every thing
Answers
Answer:
25. When burnt alkaline earth metals are placed in a nitrogen environment, the nitrides of alkaline earth metal forms.
When oxides of alkaline earth metal dissolve in water, the hydroxides of alkaline earth metal form.
When a magnesium ribbon is burnt in oxygen a white compound magnesium oxide MgO is formed accompanied by the emission of light. So, compound ‘X’ is magnesium oxide.
If the burning magnesium ribbon is placed in a nitrogen atmosphere, the magnesium nitride Mg3N2 forms. So, compound ‘Y’ is a magnesium nitride.
When the white compounds magnesium oxide MgO is dissolved in water the magnesium hydroxide forms.
The reaction is represented as follows:
MgO + H2O→Mg(OH)2
So answer is MgO + H2O→Mg(OH)2
26. Rotting, burning, cooking, and rusting are all further types of chemical changes because they produce substances that are entirely new chemical compounds. For example, burned wood becomes ash, carbon dioxide, and water. When exposed to water, iron becomes a mixture of several hydrated iron oxides and hydroxides.
27. Examples of physical changes include melting, transition to a gas, change of strength, change of durability, changes to crystal form, textural change, shape, size, color, volume and density.
28. The factors that affect reaction rates are:
- surface area of a solid reactant.
- concentration or pressure of a reactant.
- temperature.
- nature of the reactants.
- presence/absence of a catalyst.
29. When limestone and HCl react with each other, carbon dioxide gas is evolved.
30. The action of Barium Chloride on sodium sulphate
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