essay of Science examination in 250 words
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Answer:
experiments using the Scientific Method. We made observations, recorded them and used our observations to propose a hypothesis. The experiments included chemical and physical reactions dealing with torn news paper, appearance of rock salt crystals, the appearance of sand, oil and water on plastic, and making iodine in water and mineral oil. We found that all these included four physical changes and two chemical changes. This was important in determining the substance or mixture that dealt with physical and chemical properties as well as homogeneous and heterogeneous mixtures.
Purpose/Hypothesis: The purpose of this experiment
The results of our experiments appear in Table 1.
Discussion:
* When we tear the newspaper horizontally, we observed more fibers; this indicated to us that more fibers had been laid down vertically when the paper was made (Table 1). * When we crushed the rock salt crystals, we observed more tiny shards of rock salt rather than bigger pieces. We then noticed how they became more defined in water before dissolving into a clear mixture. * We observed the appearance of different pieces of sand grains and then analyzed the results while we put the sand in water. This showed the sand grains more clearly and more defined, as in their shapes and sizes. * When we added a drop of oil on the reaction surface, we observed defined smooth edges. When the drop of water was on the reaction surface, we observed more rough edges. * When we dropped the potassium iodide and the sodium hypochlorite they were both clear before mixing. We observed the chemicals after mixing and it turned to a yellow color with small red dots. This indicated that there was a chemical reaction after mixing the two chemicals. * When we added water to the oil then we added potassium iodide and sodium hypochlorite, the result was a gold center of iodine. This indicated that there was a chemical reaction but the oil had an effect on the iodine that was made.
Answer: by xtylish babu
LONG AND SHORT ESSAY ON SCIENCE IN ENGLISH
SCIENCE ESSAY 1 (200 WORDS)
Science involves extensive study of the behaviour of natural and physical world. The study is conducted by way of research, observation and experimentation. There are several branches of science. These include the natural sciences, social sciences and formal sciences. These broad categories have further been divided into sub categories and sub-sub categories. Physics, chemistry, biology earth science and astronomy form a part of the natural sciences, history, geography, economics, political science, sociology, psychology, social studies and anthropology are a part of the social sciences and formal sciences include mathematics, logic, statistics, decision theory, system theory and computer science.
Science has changed the world for good. There have been several scientific inventions from time to time and these have made life convenient for the human beings. Several of these inventions have become an integral part of our lives and we cannot imagine our lives without them. Scientists worldwide continue to experiment and keep coming up with newer inventions every now and then with some of them bringing revolution worldwide. However, as useful as it is, science has also been misused by some, mainly by those in power, for fuelling an arms race and degrading the environment.
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