What observations can be made during chemical reactions
A chemical reaction is usually accompanied by easily observed physical effects, such as the emission of heat and light, the formation of a precipitate, the evolution of gas, or a color change. Absolute confirmation of a chemical change can only be validated by chemical analysis of the products!
the colour can change
change of temperature
formation of new products
change in state
In the following question, the sentence given with blank to be filled in with an appropriate word. Select the correct alternative out of the four and indicate it by selecting the appropriate option.
The child looked up at her teacher, obviously afraid that she would further __________ her.
A) revere B) extol C) laud D) chastise...
In the following passage some of the words have been left out. Read the passage carefully and choose the correct answer for the given blank out of the four alternatives.
We have rich cultural _____ . Its roots go into _____. Ours has never been a closed ______. It has _______ just like a tree, ______ to external ______ but holding its roots _______. But one wonders today whether it will be able...