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General gas equation From the gas laws, we know that the volume of a gas depends on both its temperature and pressure. The relationship between the three variables, I.e. Volume, temperature and pressure, can be summed up as follow: If V ∝ 1/P (Boyle's law — at constant Read more
General gas equation
From the gas laws, we know that the volume of a gas depends on both its temperature and pressure.
The relationship between the three variables, I.e.
Volume, temperature and pressure, can be summed up as follow:
If V ∝ 1/P (Boyle’s law — at constant temperature)
And V ∝ T (Charles’ law —at constant pressure)
Then V∝ 1/p*T (both temperature and pressure may vary)
Or pv/T =k. Where k is a constant for a fixed mass of gas.
Theabove pv/T = is often knowm as the General Gas Equation. It simply states that; for a fixed mass of a gas under any set of conditions of V, p and T, the value of pV/T must remain constant.
If, for a fixed mass of gas, V1 is the volume at pressure P1 and absolute temperature T1 , and V2 is the volume at pressure P2 and absolute temperature T2, it follows that:
The General gas equation can be used to find the volume of a gas when both its pressure and temperature change. This,
Introduction to chemistry Chemistry is one of the three main branches of pure science, the other two being biology and physics. Chemistry deals with the composition. Properties and uses of matter. It probes into the principles governing the changes that matter undergoes. Scientific method ScientistsRead more
Introduction to chemistry
Chemistry is one of the three main branches of pure science, the other two being biology and physics.
Chemistry deals with the composition. Properties and uses of matter. It probes into the principles governing the changes that matter undergoes.
Scientists are very alert and inquisitive. They use their senses to observe what is happening around them.
Froma given set of observations, They see a certain pattern. This often leads to a problem which they try to solve. They put forward a reasonable explanation or hypothesis and carry out appropriate experiments to test it. Then they carefully record their observations and the results of their experiments.
If the experiments support the hypothesis, They discuss the hypothesis and results with other scientists in the field so that the hypothesis can be further tested. When a hypothesis has been tested and proven to be correct within the limits of available evidence, it becomes a theory . A scientific law or principle is established only after the theory has been extensively tested and proven true without any exception.
If the experiments gives negative results, then the scientist goes back to his hypothesis and either modifies it or puts forward a new hypothesis.
Chemistry in our life
We see chemical changes around us all the time.
Familiar activities and happenings like:
All this are examples of chemical reactions.
All the things we use everyday such as
Are made by chemical process
Uses of chemistry
Chemistry has contributed greatly towards providing our basic needs and improving the quality of our life.
Food: Fertilizer and insecticides have helped to increase food production greatly. Chemical processes are designed especially to preserve and store food for long periods of time, so that it can be exported to distant countries and is available to more people.
Clothing: Man-made textile fibre, produced as a result of intensive chemical research, have made available a wide range of clothing materials, which can be bought cheaply.
Housing: many high-rise buildings are being constructed to overcome the present need for housing, especially in cities. Such buildings need materials like cement, concrete, steel, bricks and tiles which are produced by chemical industries.
Transportation: Modern transportation is an essential feature of today’s world. This rapid development from carts pulled by animals to the latest aircraft was made possible by chemists producing suitable fuels and structural materials like alloys which are light, strong and heat-resistant.
Careers in chemistry
Nigeria is a rapidly developing nation with an increasing demand for skilled manpower. Many job opportunities are available for students with a knowledge of chemistry. The public and private sectors of the economy which offer such opportunities are given below.
Teaching service: Chemistry teachers and lecturers in secondary schools, polyclinics,colleges of education and universities. Laboratory assistants in schools and universities.
Health service: pharmacist, biochemists, chemists, nutritionists, dietitians, doctors, nurses, medical assistants, laboratory assistants and dispensers.
Food processing: Food technologist and research chemists.
Extractive industry: chemist, mining engineers and geologist.
Forestry: scientists engaged in research to preserve and improve forest and forestry products.