Which of the following product is formed when calcium oxide reacts with water?
When calcium oxide (chemical formula: Ca0) reacts with water (chemical formula: H20), the following reaction takes place:
The product of this reaction is calcium hydroxide, also known as slaked lime. Thus, when calcium oxide reacts with water, slaked lime is produced.
We use a solution of slaked lime to whitewash the walls. In the beginning the wall looks rough and coarse, but after 2 – 3 days the wall appears smooth and shiny. This is due to the formation of:
Slaked lime is calcium hydroxide which reacts slowly with the carbon dioxide present in air to form thin and shiny layer of calcium carbonate. The chemical reaction is:
Ca(OH)2(aq) + CO2(g) → CaCO3(s) + H2O(l)
The reaction of calcium oxide with water to form calcium hydroxide is an example of:
Combination reactions can take place between:
A chemical change must occur which is generally observed with physical changes like precipitation, heat production, color change etc. A reaction can take place between two atoms or ions or molecules and they form a new bond and no atom is destroyed or created but a new product is formed from reactants. The rate of reaction depends on and is affected by factors like pressure, temperature, the concentration of reactants.
CaO + H2O → Ca(OH)2 is an example of a:
An example of combination reaction between an element and compound is:
Sulphur dioxide is a compound and oxygen is in elemental form. They combine to form sulphur trioxide.
Which of the following reaction requires light?
Photodissociation, photolysis, or photodecomposition is a chemical reaction in which a chemical compound is broken down by photons. It is defined as the interaction of one or more photons with one target molecule. Photodissociation is not limited to visible light.
Which of the following is a combination reaction?
A reaction in which two or more reactants combine together to form a single product.
Example : C + O2 → CO2
Which of the following decomposition reaction occurs with the absorption of electrical energy?
2NO + O2 → 2NO2 is an example of :
A chemical reaction in which two or more substances combine to form a single new substance is called a combination reaction.
Representation: A + B → AB
When a magnesium ribbon is burnt in air, the ash formed is
When a magnesium ribbon is burned in air, it burns with a dazzling white flame producing white ash.
Yes, Mg is oxidized.
2Mg + O2 → 2MgO
Which of the following does denote chemical reaction take place?
A Chemical Reaction is a process that occurs when two or more molecules interact to form a new product(s)
Which of the following product is formed after heating of limestone?
The chemical reaction that takes place when limestone is heated is
CaCo3 → CaO + CO2.
Which of the following is a use of an electrolytic decomposition reaction?
Electrolytic decomposition reactions are used to obtain metals from their chloride or oxide ores.
A student uses lime water to test the gas evolved as a result of action of dilute HCl on solid sodium carbonate. The chemical compound present in lime water is :
The Chemical Formula of lime water is Ca(OH)2 (Calcium Hydroxide).