Advertisements
Advertisements
Question
Represent the addition of dilute sulphuric acid to zinc by means of a chemical equation. State the function of the arrow between the reactants and products.
Solution
- Reactants
Left hand side write the reactants (substances which take part in a reaction).
- Products
Right hand side write the products (substances formed as a result of the reaction).
Chemical equation formed is
\[\ce{\underset{\text{[dil.]}}{Zn} + H2SO4 -> ZnSO4 + H2[g]}\]
The function of the arrow (→) between the reactants and products is that it represents the chemical reaction taken place between two reactants.
APPEARS IN
RELATED QUESTIONS
State whether the following statement is true or false. In case a statement is false, write the corrected statement.
Condensation of steam is not a chemical change.
Changes in which new substances are formed are called ______ changes.
How do the following help in bringing about a chemical change?
catalyst .
Complete and balance the following chemical equations:
N2 + O2 →
Give reason.
Acidic soil is treated with quick lime.
What are homogenous reactions ?
State four conditions necessary for a chemical reaction to take place.
Give an example of the following chemical change.
A reaction where colour change is noticed
Give reason for the following:
Silver nitrate solution is kept in coloured bottles.
What do you observe? When
Barium chloride is added to sodium sulphate solution
Complete and balance the following reaction:
\[\ce{CuCO3 ->[\Delta]}\]
What do you observe when H2S is passed through a lead nitrate solution.
What do you observe when Cl2 is passed through potassium iodide (KI) solution.
What do you observe when CO2 is passed through lime water first and then a little in excess.
A chemical reaction is often accompanied by external indications or characteristics which include –
- Colour change
- Effervescence or gas evolved
- Evolution or absorption of heat
- Formation of a precipitate.
With reference to each of the above indications, state the external indication seen during – Thermal decomposition of mercury [II] oxide.
Give balanced equation for the following conversion affected by heat alone on the substance:
Zinc nitrate to nitrogen dioxide
Give a balanced equation for the conversion of a soluble lead salt to an insoluble lead salt – formed as a white precipitate.
Complete the statement by filling in the blank with the correct word:
The reddish-brown precipitate obtained during a double decomposition precipitation reaction between an iron salt and alkali is __________.
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Lead nitrate.
Higher order Thinking question
Peeled and unpeeled banana does not look the same. Does that mean peeling banana is a chemical change?
Photosynthesis is a chemical reaction that takes place in the presence of ______.
A thick coating of a paste of Plaster of Paris (POP) is applied over the bandage on a fractured bone. It becomes hard on drying to keep the fractured bone immobilised. Can the change in POP be reversed?
Silver articles turning black: ______:: Boiling of H2O: physical change ______.
Which of the following are chemical changes?
(i) Decaying of wood
(ii) Burning of wood
(iii) Sawing of wood
(iv) Hammering of a nail into a piece of wood
Classify the following as physical or chemical properties
Most metal oxides form alkalis on interacting with water.
Give an example of a chemical reaction for each of the following situations:
A change in colour is observed.
Assertion (A): Cutting paper into very small pieces is an irreversible change.
Reason (R): Physical changes are always reversible.
When milk is mixed with coffee decoction, the colour of milk and decoction changes due to ______.
What are the chemical reactions that occur in everyday life?
