Question

in which of the following heat energy will be evolved?1) electrolysis of water 2) burning of lpg 3) heating of CaCo3. 4) photo decomposition of AgBr

state one basic difference between chemical change and physical change


write the balanced equation for the process photosynthesis

a metal X is available in the form of a ribbon burns in air with dazzling white powder Y which dissolves in water this solution Z turns red litmus to blue . identify X Y Z and write balanced equation for this solution


if answered all correct I will mark as branliest answer ☺️☺️​

Answer 1

Explanation:

1. Heat energy will be evolved in burning of LPG

2. Chemical change is mostly irreversible while as physical change is reversible.

3. 6CO2 + 6H2O ------> C6H12O6 + 6O2

4. Magnesium ribbon burns with dazzling white light, once treated to its ignition temperature. The white powder formed is Magnesium oxide which dissolves in water to give a basic solution which turns red litmus blue. Thus 'x' is Mg and 'y' is MgO. 2MgO+O2 → 2MgO

MgO+H2O → Mg(OH)2

hope this helps