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- Balancing the Chemical Equations:
- In a balanced chemical equation, the total number of atoms of each element of the reactants on the left hand side of the equation is equal to the number of atoms of the products formed on the right hand side of the equation.
- The total mass of the reactants is equal to the total mass of the products or the number of atoms of each element before the reaction and after the reaction is equal.
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15/4-7x=9
7x = 15/4 - 9
7x = (15 -36)/4
28x = 21
x = 21/28
x = 3/4
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A rational number is a number that can be written in the form of a numerator upon a denominator. Here the denominator should not be equal to 0. The numerator and the denominator will be integers.
A rational number is of the form p/q
p = numerator, q= denominator, where p and q are integers and q ≠0
Examples: 3/5, −3/10, 11/−15. Here we can see that all the numerators and denominators are integers and even the denominators should be non-zero.
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Meaning of Minerals is given below:
Minerals are homogeneous naturally occurring substances normally found in solid, liquid and gaseous state.
Types of Minerals
Minerals are classified into two types: Metallic and non-metallic.
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Natural resources are something which comes from nature and people cannot make natural resources but they can collect it. Some of the examples natural resources are water, wood, iron, and coal. Some of the resources like hydro-electric energy are not natural because they are made by people.
Natural resources are classified into 2 categories:
- Renewable natural resources
- Non-Renewable natural resources
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Iron when reacted with both water and oxygen which present in air (moist air), corrodes. Its silvery colour changes to a reddish-brown, because hydrated oxides are formed which is commonly called as rust.
Reaction showing formation of rust when reacted with water in presence of oxygen (atmosphere).
4Fe + 3O₂+ XH₂O → 2Fe₂O₃.XH₂O
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Yogita Ingle 6 years, 4 months ago
History is the study of the past. History is divided into different periods because of the following reasons:
1. The division of history helps us to understand the change or transition in all forms of living during one period and the other.
2. It helps us to know the characteristics of time.
3. History is divided into ancient, medieval, modern and colonial periods.
4. Ancient history dates back to the evolution of man and stone age era. This period of history makes us know the lifestyle of a prehistoric man who was basically nomads.
5. But the modern period details about the development in science, technology, culture and democracy etc.,
6. The historic period during which these modern features were not available is termed as Medieval period.
7. Colonial period refers to the period when India was under British rule, the slavery of Indians and their fight for freedom.
8. The division helps us to understand the events in a detail and comprehensive manner during each period.
Thus, the significance of change can be well understood because of the division of history into periods.
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