Answer:
2
Explanation:
You write your answer with the same number of significant figures as the number with the smallest amount of figures, in this case, that number is 2.1 so your answer should be written with 2 significant figures.
you can't solve that, you need more information in that equations like and x or an y.
Otherwise, the equation stays like that.
Answer:
H2S.
Explanation:
That would be H2S, hydrogen sulphide. (Smells like bad eggs!).
Answer: Options (a) and (d) are the correct answer.
Explanation:
A catalyst is the substance which helps in increasing the rate of reaction.
Activation energy is the minimum amount of energy required by reactants to start the reaction. On addition of catalyst, the path of reaction changes because the energy barrier gap reduces and hence, the activation energy also decreases.
In the absence of catalyst, we need to increase the temperature so that reaction can occur quickly.
Whereas on addition of catalyst, there is no need to increase the temperature as the catalyst itself is sufficient to increase the rate of reaction. As a result, temperature should be lowered when there is addition of catalyst in the reaction.
Thus, we can conclude that catalysts can save money by essentially lowering the activation energy and temperature required.
There are 195 countries in the world today. This total comprises 193 countries that are member states of the United Nations and 2 countries that are non-member observer states: the Holy See and the State of Palestine.
There are 50 US states.
The United States currently administers 16 territories as insular areas:
American Samoa.
Guam.
Northern Mariana Islands.
Puerto Rico.
U.S. Virgin Islands.
This information is from three sources. United Nations, Wikipedia, and United States and their satellite states aka countries.
