Q6. Ann shines a ray of white light at a glass prism.
screen
prism
(a)
Tick one box in each row to show if each sentence is true or false.
true
false
The light refracts as it enters the prism.
The light refracts as it travels through the prism.
The light disperses as it leaves the prism.
The light forms a spectrum of colours on the screen.

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e

the answer is barium and copper bromide

warm front forms when a moist, warm air mass slides up and over a cold air mass. as the warm air mass rises, it condenses into a broad area of clouds. a warm front brings gentle rain or light snow, followed by warmer, milder weather.

hope i !