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Gaurav Seth 5 years, 7 months ago
Acids react with most metals and a salt is produced. But unlike the reaction between acids and bases we don't get any water. Instead we get hydrogen gas.
This is the general word equation for the reaction:
metal + acid → salt + hydrogen
Salts
The salt produced depends upon the metal and the acid. Here are two examples:
zinc + sulphuric acid → zinc sulphate + hydrogen
magnesium + hydrochloric acid →magnesium chloride + hydrogen
It doesn't matter which metal or acid is used, if there is a reaction we always get hydrogen gas as well as the salt.
The test for hydrogen
There is a simple laboratory test to see if a gas is hydrogen. A lighted wooden splint goes pop if it is put into a test tube of hydrogen. This is because the flame ignites the hydrogen, which burns explosively to make a loud sound.
Acids and hydrogen
All acids contain hydrogen atoms. Apart from hydrochloric acid, this is not clear from their names, but you can tell they contain hydrogen from their chemical formulae. Remember that the chemical symbol for hydrogen is H
Posted by Ritrsh Verma ༒ 5 years, 7 months ago
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Yogita Ingle 5 years, 7 months ago
Types of Life Processes
- Nutrition : Nutrition is the process of taking food by an organism and the utilization of food for energy. This is a vital process, which helps living beings to obtain their energy from various sources.
- Transportation: Transportation and transportation system in plants and animals are entirely different. In animals, transportation is carried out through the circulatory system. This system includes the heart, blood, and blood carrying blood vessels.
- Metabolism : Metabolism is the chemical process in which different types of chemical reactions involved in controlling the living state of the cells in an organism. It is broadly classified into catabolism and anabolism.
- Respiration : Respiration includes the exchange of gases as well as the burning of food. Animals have a well defined respiratory system for respiration.
- Reproduction: The biological process of reproducing their own offspring determines the continuity of species, generation after generation. The basic types of reproduction are sexual and asexual reproduction.
- Excretion: Elimination of toxic waste substances from the body is called excretion. There are various modes of excretion and it generally differs with the different types of living species.
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Yogita Ingle 5 years, 7 months ago
Properties of Base:
– Produce hydroxide ions [OH –] in H2O.
– Water soluble bases are called alkalies.
– Bitter Taste
– Turn Red Litmus blue.
– Act as electrolytes in Solution.
– Neutralize solutions containing H+ ions.
– Have a slippery, ‘soapy’ feel.
– Dissolve fatty material.
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Yogita Ingle 5 years, 7 months ago
Hit and Trial Method
The simplest method to balance a chemical equation is by the hit and trial method also called the trial and error method.
The method involves the following steps:
Step 1: Write the correct formulae of the reactants and the products with plus signs in between with an arrow pointing from the reactants to the products. This is called the skeleton equation.
Step 2: Select the largest formula from the skeleton equation and equalise the number of atoms of each of its constituent elements on both sides of the chemical equation by suitable multiplications.
Or
Balance the atoms of that element which occurs at the minimum number of places on both sides of the chemical equation first. Atoms which occur at a maximum number of places are balanced last of all.
Step 3: When an elementary gas (diatomic) such as hydrogen, oxygen, chlorine or nitrogen appears as a reactant or a product, the equation is balanced more easily by keeping the elementary gas in the atomic state. The balanced atomic equation is then made molecular by multiplying the whole equation by two.
Step 4: Verify that the number of atoms of each element is balanced in the final equation.
Step 5: The chemical equation can be made more informative by mentioning the physical states of the reactants and the products. Thus, the gaseous, liquid, aqueous and solid states of the reactants and products are represented by the notations (g), (l), (aq) and (s), respectively.
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Yogita Ingle 5 years, 7 months ago
- Sclera: It is the outer covering, a protective tough white layer called the sclera (white part of the eye).
- Cornea: The front transparent part of the sclera is called cornea. Light enters the eye through the cornea.
- Iris: A dark muscular tissue and ring-like structure behind the cornea are known as the iris. The colour of iris actually indicates the colour of the eye. The iris also helps regulate or adjust exposure by adjusting the iris.
- Pupil: A small opening in the iris is known as a pupil. Its size is controlled by the help of iris. It controls the amount of light that enters the eye.
- Lens: Behind the pupil, there is a transparent structure called a lens. By the action of ciliary muscles, it changes its shape to focus light on the retina. It becomes thinner to focus distant objects and becomes thicker to focus nearby objects.
- Retina: It is a light-sensitive layer that consists of numerous nerve cells. It converts images formed by the lens into electrical impulses. These electrical impulses are then transmitted to the brain through optic nerves.
- Optic nerves: Optic nerves are of two types. These include cones and rods.
- Cones: Cones are the nerve cells that are more sensitive to bright light. They help in detailed central and colour vision.
- Rods: Rods are the optic nerve cells that are more sensitive to dim lights. They help in peripheral vision.
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Resistor is defined as: A passive electrical component with two terminals that are used for either limiting or regulating the flow of electric current in electrical circuits.
The SI unit of resistor is Ohm.
Posted by Mamta Rana 5 years, 7 months ago
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Yogita Ingle 5 years, 7 months ago
An occupational hazard is a disease which we get due to our occupation. An example is the sorters disease .People working in the sorters departmnt ( in the factory where wool is sorted ) are infected by this bacterium called anthrax. which causes this fatal Occupational hazard is the term used for risk or the consequences involved with a particular occupation.
Mostly mental stress and the physical risks are encountered while working with industries. Physical risks may involve any disease or injury whereas, mental stress can be due to work pressure. It is the responsibility of company to take proper care of its employees & their health.
Some examples of the occupational hazards are:
Excessive noise and heat are commonly found problems in industries, which can affect the hearing of workers.
In chemical industries, employee deals with harmful and dangerous chemicals which can burn their skin, also their powerful smell can cause breathing problems.
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Shivam Kumar 5 years, 7 months ago
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