3. Write a chemical equations to show a reaction between a metal and air
4. What are hormones?
5. What do you understand by the term combustion?
Answers
Answer:
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Explanation:
3.Metal+Oxygen-Metaloxide
4.Hormones are chemical messengers that are secreted directly into the blood, which carries them to organs and tissues of the body to exert their functions. There are many types of hormones that act on different aspects of bodily functions and processes. Some of these include: Development and growth.
5.Combustion, a chemical reaction between substances, usually including oxygen and usually accompanied by the generation of heat and light in the form of flame.
Answer:
solution 1
Calcium metal reacts with water-
(Calcium)
Ca
+
(Water)
2H
2
O
⟶Ca(OH)
2
+H
2
(ii) Cinnabar is heated in the presence of air-
(Cinnabar)
HgS
+
(Air)
3O
2
−2SO
2
2HgO⟶2Hg+O
2
(iii) Manganese dioxide is heated with aluminium powder-
(Mnganese dioxide)
3MnO
2
+
(Aluminium powder)
4Al
⟶3Mn+2Al
2
O
3
solution 2.
Hormones
Hormones are chemical substances that act like messenger molecules in the body. After being made in one part of the body, they travel to other parts of the body where they help control how cells and organs do their work. For example, insulin is a hormone that's made by the beta cells in the pancreas. When it's released into the blood, insulin helps regulate how the cells of the body use glucose (a type of sugar) for energy.
solution .3
Combustion, a chemical reaction between substances, usually including oxygen and usually accompanied by the generation of heat and light in the form of flame. The rate or speed at which the reactants combine is high, in part because of the nature of the chemical reaction itself and in part because more energy is generated than can escape into the surrounding medium, with the result that the temperature of the reactants is raised to accelerate the reaction even more.