1. Change in color
2. Formation of bubbles
3. Formation of a precipitate
4. Begins to make an odor
When you cook the egg, you are changing the egg from a gooey liquid to a soft solid. So, liquid to solid is chemical change, so yeah? ...
Hi , well I think that you're referring to a pure substance , in other words a substance that contains only one kind of matter.
Answer: -
100 grams
Explanation: -
Mass of Oxygen = 40 g
Chemical formula of oxygen gas = O2
Molar mass of oxygen = 16 x 2 = 32 gram
Atomic mass of Mg = 24g
Molar mass of MgO = 24 x 1 + 16 x 1 =40 gram
The balanced chemical equation for the reaction is
2Mg + O2 -- > 2 MgO
So from the balanced equation we see that 1 O2 react to give 2 MgO
32 grams of O2 react to give 2 x 40 gram of MgO
40 grams of O2 react to give
=100 gram of MgO
Answer: Other scientists repeat and match the result.
Explanation:
A scientific theory can be define as the description for the cause of natural phenomena. This is supported by evidences obtain by experimental process.
A scientific theory is said to be reliable when similar results obtain by the other scientists on application of the same concept or methodology as in theory.