The chemical reaction comprises chemical changes, that is, changes in the composition of the molecules, the formation of new compounds. As a consequence of the chemical reaction, new substances are produced, which cannot be reversed by any physical means.
One of the best ways to identify a chemical reaction is observing the change in color, or changes in the color of the substance. This is one of the most general observable chemical reaction known, the basic example is the changing of litmus paper color when it comes in contact with the acid.
Answer:
the atom is neutral, the nucleus is positive
Explanation:
Answer: Option (b) is the correct answer.
Explanation:
When it rains, then mud in the backyards become wet. It is known that earthworms live inside earth and diffusion of oxygen gets slower through water than through air.
As a result, supply of oxygen to the worms decreases in wet mud hence, they come to the surface in order to breathe.
Thus, we can conclude that wet mud in the backyard most likely formed the earthworms.
Mass of Product (y) vs Time (x) graph and Concentration of Reactant (y) vs Time (x) graph are two graphs which could be used to work out the rate of reaction from the gradient.
<h3>What is Rate of reaction ?</h3>
It is reffered as the speed at which a chemical reaction proceeds.
It is often expressed in terms of either the concentration (amount per unit volume) of a product that is formed in a unit of time or the concentration of a reactant that is consumed in a unit of time.
The rates of two or more reactions can be compared using a graph of mass or volume of product formed against time.
concentration of reactant against time of reaction is used to find the instantaneous rate of reaction at a given time.
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4FeS2 + 11O2-> 2Fe2O3 + 8SO2
Not sure.... I think this is it