Answer Key for Grade-6 Social Studies 2nd final Term Examination 2021 Page 85 Exercise 1: What is the difference between climate and weather? Explain. The weather changes within a short time (24 hours or less), and it changes from day to day. While the climate is constant over a long period (it does not change from one day to another), and it characterizes the general atmosphere of a place over a long period. Exercise 2: Name the four elements that affect the change of climate from one place to another or from one season to the other. 1. Temperature (heat) 2. Atmospheric pressure 3. Precipitation 4. Wind Exercise 3: Write “true” or “false”. 1. Wind moves all the time above the surface of the Earth. T 2. A barometer measures temperature. F 3. Temperature refers to heat and the sun might be a possible source of heat. T 4. When I say it’s going to be cloudy today, the I am referring to the weather. T Page 100 Exercise II: Circle the best choice. 1. Temperature is usually meas
Revision work for chemistry Grade-8 2021. Chose the best. 1. In a brewery the Fermentation is carried out in ------------------- vats. A. Small B. Large C. Medium D. All 2. Drugs are substances which affect the ----------------------- in some way. A. Plastic B. Rocks C. Body D. None of them 3. I n the 1950s a new drug called Paracetamol was introduced. A. Paracetamol B. Placebo C. Emulsion D. Fermentation 4. An Emulsion is an example of a ---------------- . A. Emulsion B. Fermentation C. Placebo D. Colloidal 5. Detergents are ------------------ agents. A. Soft B. Cleaning C. Bad D. All True and False 1. The industries tend to run their processes continuously. T 2. Aspirin is used for headaches, fevers, and in larger d o ses for arthritis. T 3. A French chemist called Charles Frederic Gerhardt made a safer drug in 1750 . F 4. The pigments are sol
What is an acid? Define strong and weak acids. A cid: An acid is a substance that donates protons or accepts a pair of valence electrons to form a bond . Weak Acids: do not completely dissociate into their ions in water. H 3 PO 4 - phosphoric acid HNO 2 - nitrous acid C 6 H 5 COOH - benzoic acid CH 3 COOH - acetic acid HCOOH - formic acid Strong Acids: Strong acids dissociate completely into their ions in water, yielding one or more protons (hydrogen cations ) per molecule. HCl - hydrochloric acid HNO 3 - nitric acid H 2 SO 4 - sulfuric acid ( HSO 4 - is a weak acid) HBr - hydrobromic acid HI - hydroiodic acid
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