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ScienceClass 6CBSE

What is Mixture

A mixture is a substance made up of two or more elements or compounds mixed in any ratio. The components of a mixture do not chemically react with each other, and they retain their individual properties. Mixtures can be classified into two types: Homogeneous mixture – In this type, the components are uniformly mixed and cannot be seen separately. Example: salt dissolved in water. Heterogeneous mixture – In this type, the components are not uniforml

ScienceClass 6CBSE

Mixtures and Methods of Separation

In our daily life we come across many substances that are made up of more than one component. These substances are called mixtures. For example, air, soil, seawater, and tea are all mixtures. A mixture is formed when two or more elements or compounds are combined together in any proportion without undergoing a chemical change. The substances present in a mixture retain their own properties and can usually be separated by simple physical methods. Scientists and people in everyday life

ScienceClass 6CBSE

How is the iron blade in tools fixed to the wooden handle?

Many tools such as hammers and axes have iron blades attached to wooden handles. The iron blade usually has a ring that is slightly smaller than the wooden handle. To fix the handle, the iron ring is heated. When heated, iron expands and the ring becomes larger. The wooden handle is then inserted into the ring. When the iron cools down, it contracts and fits tightly around the handle. This method ensures that the blade remains firmly attached to the handle.

ScienceClass 6CBSE

How Blacksmiths Shape Iron

A blacksmith changes a piece of iron into different tools by heating it until it becomes red hot. When iron is heated, it becomes soft and can easily be beaten into different shapes using a hammer. This method allows blacksmiths to make tools such as knives, axes, and agricultural equipment.

ScienceClass 6CBSE

Examples of Reversible and Irreversible Changes

Let us identify some changes: Cooking of food – Irreversible changeMelting of wax – Reversible changeSouring of milk – Irreversible changeDissolving salt in water – Reversible change (salt can be obtained again by evaporation)

ScienceClass 6CBSE

Name two changes which can be controlled.

Some changes can be controlled to prevent damage or loss. Two examples of such changes are: Rusting of ironRusting can be controlled by painting, oiling, or galvanizing iron objects.Spoiling of foodFood spoilage can be controlled by refrigeration, drying, or adding preservatives. These methods help in increasing the life of materials and food.

ScienceClass 6CBSE

Define pasteurization.

Pasteurization is the process of heating milk at a specific temperature for a certain period of time to kill harmful microorganisms. This method helps to prevent spoilage and keeps milk safe for drinking for several days. Pasteurization was developed by the scientist Louis Pasteur. Today it is widely used in dairy industries to preserve milk and other beverages.

ScienceClass 6CBSE

What is solution?

A solution is a mixture formed when a substance dissolves in a liquid. The substance that dissolves is called the solute, and the liquid in which it dissolves is called the solvent. For example, when salt is dissolved in water, a salt solution is formed. In this mixture, salt is the solute and water is the solvent. Solutions are usually clear and uniform throughout.

ScienceClass 6CBSE

What are reversible changes? Give two examples of changes, which can be reversed.

Reversible Changes Reversible changes are those changes that can be undone or reversed to get back the original substance. In such changes, the substance can return to its previous state by changing the conditions. ExamplesIce changing into water and water freezing into iceWhen ice is heated, it melts into water. When the water is cooled, it turns back into ice.Stretching a rubber bandWhen we stretch a rubber band and release it, it returns to i

ScienceClass 6CBSE

Define periodic change.Write 2 examples of periodic change.

A periodic change is a change that occurs at regular intervals of time. These changes repeat themselves after a definite period. Examples of Periodic Changes Phases of the moon – The shape of the moon changes regularly over a month. Heartbeat – The heart beats continuously at regular intervals to pump blood throughout the body. Periodic changes are important

ScienceClass 6CBSE

Give an example of natural change.

A natural change is a change that occurs naturally without human involvement. These changes occur due to natural processes. Example Germination of seeds is a natural change. When a seed gets proper water, air, and sunlight, it grows into a plant. This process happens naturally in nature. Other examples include rainfall, growth of plants, and changes in seasons.

ScienceClass 6CBSE

What do you mean Chemical Changes

A chemical change is a change in which one or more new substances are formed with different properties from the original substances. In chemical changes, the composition of the substance changes permanently. Chemical changes are usually permanent and irreversible. Once the change takes place, it is very difficult or impossible to bring the substance back to its original form. Examples of Chemical Changes Burning

ScienceClass 6CBSE

What do you mean by a physical change?

A physical change is a change in which only the physical properties of a substance change. These properties include shape, size, state, or appearance. In a physical change, no new substance is formed, and the original substance remains the same. Physical changes are often temporary and can usually be reversed. For example, when ice melts into water, the substance remains water in both cases; only the state changes from solid to liquid. <strong

ScienceClass 6CBSE

Why are more than one dish preferred in a single meal? Write a reason other than taste.

More than one dish is preferred in a single meal because the body needs different kinds of nutrients to stay healthy. No single food item can provide all the nutrients required by the body. For example, rice or wheat provides carbohydrates for energy, pulses provide proteins for growth and repair of tissues, vegetables and fruits provide vitamins and minerals, and some foods provide fats that give additional energy. By eating a variety

ScienceClass 6CBSE

Based upon your daily observations, tell about the food eaten by a squirrel, lizard, and a mosquito.

Different animals eat different kinds of food depending on their nature and body structure. A squirrel mainly eats grains, nuts, fruits, and seeds. It is commonly seen collecting food such as peanuts, acorns, and grains from trees and fields. A lizard is an insect-eating animal. It feeds on small insects such as flies, mosquitoes, ants, and beetles. Lizards help control insect populations in houses and gardens. <strong

ScienceClass 6CBSE

What are sprouted seeds? How are they made to eat?

Sprouted seeds are seeds that have begun to grow into small seedlings after being soaked in water. During sprouting, the seed absorbs water and starts the process of germination. A tiny shoot appears from the seed, which indicates that the seed has started growing. To prepare sprouted seeds for eating, first take seeds such as moong or chana and wash them properly. Then soak them in water for several hours or overnight. After soaking, remove t

ScienceClass 6CBSE

Is the flower’s nectar available all through the year?

No, flower nectar is not available throughout the year. Nectar is a sweet liquid produced by flowers to attract insects, birds, and other animals that help in pollination. However, flowers bloom only during certain seasons of the year, depending on the type of plant and environmental conditions. When flowers bloom, they produce nectar for a limited period of time. After pollination takes place and the flowers wither away, nectar is no longer available. Therefo

ScienceClass 6CBSE

How will you make tasty snacks from moong or chana?

Tasty and healthy snacks can be prepared from moong (green gram) or chana (chickpeas) by the process of sprouting. Sprouting increases the nutritional value of the seeds and makes them easier to digest. To prepare this snack, first wash the moong or chana thoroughly with clean water. Then soak the seeds in a bowl of water for about 8&ndash;10 hours or overnight. During soaking, the seeds absorb water and become soft. After soaking, drain the water and keep the

ScienceClass 6CBSE

Which cereal fields have rows of plants? Name at least one.

Many cereal crops are grown in fields in an organized manner with rows of plants. This arrangement helps farmers take better care of the crops and makes it easier to irrigate the fields, remove weeds, and harvest the crops. Two common cereal crops that are grown in rows are wheat and paddy (rice). In wheat fields, seeds are sown in straight rows so that each plant gets enough sunlight, water, and nutrients from the soil. This method also helps farmers move eas

ScienceClass 6CBSE

How many ingredients are needed to prepare a dish of boiled rice?

To prepare a simple dish of boiled rice, only two main ingredients are required: rice and water. Rice is a cereal grain that serves as the main food ingredient, while water is used to cook and soften the grains. The preparation process is very simple. First, the rice grains are washed with clean water to remove dust and impurities. Then the washed rice is placed in a pot with an adequate amount of water. The mixture is heated on a stove or fire. As the tempera

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