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[ Chapter Index | Main Index ]. Answers for Quiz on Chapter 5. This page contains sample answers to the quiz on Chapter 5 of Introduction to Programming Using Java. Note that generally, there are lots of correct answers to a given question. Question 1: Object-oriented programming uses classes and objects. What are classes and what are objects? What is the relationship between classes and objects? Answer� Explain why the class Player that is defined in the previous question has an instance method named toString(), even though no definition of this method appears in the definition of the class. Answer: If a class is not declared to extend any class, then it automatically extends the class Object, which is one of the built-in classes of Java. Grade 4 and 5 maths questions and problems to test the understanding of maths concepts and procedures are presented. Answers to the questions are provided and located at the end of each page. Online calculators to check your answers are provided at the bottom of this page. Grade 4. Problems - Grade 4 Maths Questions With Answers. Math problem answers are solved here step-by-step to keep the explanation clear to the students. In Math-Only-Math you'll find abundant selection of all types of math questions for all the grades.� In Math-Only-Math you'll find abundant selection of all types of math questions for all the grades with the complete step-by-step solutions. Parents and teachers can follow math-only-math to help their students to improve and polish their knowledge. Children can practice the worksheets of all the grades and on all the topics to increase their knowledge. Various types of Math Problem Answers are solved here. 1. Mrs. Rodger got a weekly raise of $ If she gets paid every other week, write an integer describing how the raise will affect her paycheck.

These important questions class 7 science chapter 5 extra question answers based on notes and exercises. Substances which are sour in taste are called acids. We use in our daily life a large number of acids such as curd, lemon, juice, orange juice, vinegar, tamarind etc. These substances taste sour because they contain acids. Substance which are bitter in taste and soapy to touch are called bases. We use in our daily life a large number of bases such as baking soda, washing soda, milk of magnesia, lime water etc.

These substances taste bitter because they contain bases. Methyl orange and phenolphthalein used as indicator. In acidic solution, methyl orange gives red colour but in basic solution it gives yellow colour. In acidic solution, phenolphthalein is colourless but in basic it gives pink colour. The solutions which do not change the colour of either red or blue litmus are known as neutral solutions. These substances are neither acidic nor basic.

What do you mean by indicators? Name two naturally occurring indicators. A special type of substances are used to test whether a substance is acidic or basic. These substances are known as indicators. The indicators change their colour when added to a solution containing an acidic or a basic substance. Turmeric, litmus, china rose petals Gudhal , etc. The most commonly used natural indicator is litmus. It is extracted from lichens.

It has a mauve purple colour in distilled water. When added to an acidic solution, it turns red and when added to a basic solution, it turns blue. It is available in the form of a solution, or in the form of strips of paper, known as litmus paper. Generally, it is available as red and blue litmus paper.

We get water from rain. It is the pure form of water but the rain containing excess of acids is called acid rain. The rain becomes acidic because carbon dioxide, sulphur dioxide and nitrogen dioxide which are released into the air as pollutants dissolve in rain drops to form carbonic acid, sulphuric acid and nitric acid respectively.

Pollutants present in the atmosphere mix with the rain to make it acidic and it can cause damage to buildings, historical monuments, plants and animals. Our stomach contains hydrochloric acid. It helps us to digest food. But too much of acid in the stomach causes indigestion. Sometimes indigestion is painful.

To relieve indigestion, we take an antacid such as milk of magnesia, which contains magnesium hydroxide. It neutralises the effect of excessive acid. When an ant bites, it injects the acidic liquid formic acid into the skin.

The effect of the acid can be neutralised by rubbing moist baking soda sodium hydrogen carbonate or calamine solution, which contains zinc carbonate.

What do you mean by neutralization reaction? Explain with examples. When an acidic solution is mixed with a basic solution, both the solutions neutralise the effect of each other.

When an acid solution and a base solution are mixed in suitable amounts, both the acidic nature of the acid and the basic nature of the base are destroyed. The resulting solution is neither acidic nor basic. In neutralisation reaction, heat is always produced, or evolved.

The evolved heat raises the temperature of the reaction mixture. In neutralisation reaction a new substance is formed. This is called salt. Salt may be acidic, basic or neutral in nature. The reaction between an acid and a base is known as neutralisation. Salt and water are produced in this process with the evolution of heat. When a farmer uses excessive use of chemical fertilisers makes the soil acidic. Plants do not grow well when the soil is either too acidic or too basic.

When the soil is too acidic, it is treated with bases like quick lime calcium oxide or slaked lime calcium hydroxide. If the soil is basic, organic matter is added to it. Organic matter releases acids which neutralises the basic nature of the soil. The wastes of many factories contain acids.

If they are allowed to flow into the water bodies, the acids will kill fish and other organisms. The factory wastes are, therefore, neutralised by adding basic substances.

Take some turmeric and mix it in some water to make a paste. Deposit it on blotting paper or filter paper and dry it. Cut thin strips of the yellow paper so obtained. These thin strips are turmeric paper.

What do you mean by organic acids and mineral acids? Give examples. Organic acids are the naturally occurring acids they are found in various types of plants and animals.

Some of the important organic acids which occur in nature are acetic acid, formic acid, citric acid, tartaric acid etc. The acids prepared from the minerals of the earth are called mineral acids. Mineral acids are the man-made acids.

Mineral acids are also known as laboratory acids because they are used in the science laboratory to perform experiments. Such as hydrochloric acid, sulphuric acid and nitric acid. Hydrochloric acid, sulfuric acid and nitric acid are strong acids. On the other hand, acetic acid, formic acid, citric acid, tartaric acid and carbonic acid are some of the weak acids. Hydrochloric acid is used in cleaning kitchen sinks and bathroom sanitaryware. Sulphuric acid is used in making storage batteries for cars, buses, trucks and inverters.

Nitric acid is used by goldsmith for cleaning gold and silver ornament. Being weak organic acids like acetic acid, citric acid and tartaric acid are used as food ingredients. Many foods like pickle and tomato ketchup contains acetic acid in the form of vinegar. Baking powder used in making cakes and biscuits contain tartaric acid. Carbonic acid is used in fizzy soft drinks and soda water.

It gives them a pleasant taste. A substance which reacts with a base to form a salt and water is called an acid. Acids have sour taste. Acids turn blue litmus to red. Some of the examples, of acids are acetic acid, citric acid, hydrochloric acid, sulphuric acid, nitric acid etc. A substance which can neutralize an acid to form a salt and water is called a base. Base have bitter taste. Bases turn red litmus to blue. Bases are the chemical opposites of acids.

Some of the examples, of bases are sodium hydroxide, potassium hydroxide, calcium hydroxide, magnesium hydroxide. We know that some of the sugary food eaten by us is converted into acid by the bacteria present in our mouth. And this acid causes tooth decay. The toothpaste which we use for brushing and cleaning our teeth is basic in nature.

Since toothpaste is basic, it neutralizes the acid in our mouth and hence prevents tooth decay. Although both are natural indicator. Write down the damages occurred by the acid rain? The rain which contains a higher level of acid than normal is called acid rain.

Distilled water is neutral by nature. We can verify it by litmus test. As water does not change the colour of either red or blue litmus. Boojho can use litmus test on this drink.

Just drop few drops of drink on litmus paper and take the decision according to the following: If it turns blue drink is basic, if it turns red drink is acidic and if it turns green drink is neutral.

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