Advertisements
Advertisements
प्रश्न
Fill in the blank
A new substance is always formed in a _______ change.
Advertisements
उत्तर
A new substance is always formed in a chemical change.
APPEARS IN
संबंधित प्रश्न
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.
The chemical name of baking soda is ______.
How do the following help in bringing about a chemical change?
pressure.
FILL IN THE BLANK
Positively charged ions are called ........
Write true or false.
A chemical equation gives only qualitative information of a chemical reaction.
Name the type of chemical reaction shown by the following equation:
2Mg + O2 → 2MgO
State the type of reactions for the following represent and balance the ones that are not balanced.
NaOH + HCl → NaCl + H2O
Name: Two nitrates that do not produce nitrogen dioxide on heating.
State the original colour of the following substance and colour of residue obtained after heating.
Ammonium dichromate
Give a word equation for the following reaction.
Two solids which combine on heating, to give a liquid.
Explain the Silver nitrate solution is kept in coloured reagent bottles in the laboratory.
State the following reaction represent oxidation or reduction.
\[\ce{Fe++->Fe+++}\]
State the following reaction represent oxidation or reduction.
\[\ce{Cu++->Cu}\]
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?
Classify the following as physical or chemical properties
Zinc dissolves in hydrochloric acid with the evolution of hydrogen gas.
A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour.
What changes do you expect?
Rusting of iron is ______.
Heat may evolve or be absorbed during a ______ change.
What is thermochemical reactions?
