Magnetism is the power to attract. It refers to the attraction to iron and other metals in electric currents and magnets, or to the other kind of attraction — where people want to be close to each other. Chemistry and earth science are two classes you might learn about magnetism in.

Summary: Magnets are well-known from the physics lessons at school, but they are hardly covered in chemistry lectures; and it is still a chemical process by means of which researchers have succeeded in controlling magnetic properties in bulk ferromagnets.

The change of one type of matter into another type (or the inability to change) is a chemical property. Examples of chemical properties include flammability, toxicity, acidity, reactivity (many types), and heat of combustion.

Magnetism is a physical property because attracting something to a magnet does not change the substance (change of the composition) itself and doesn’t involve chemical reactions.

Examples of physical properties are: color, smell, freezing point, boiling point, melting point, infra-red spectrum, attraction (paramagnetic) or repulsion (diamagnetic) to magnets, opacity, viscosity and density.

Examples of Physical Changes

• Crushing a can.
• Melting an ice cube.
• Boiling water.
• Mixing sand and water.
• Breaking a glass.
• Dissolving sugar and water.
• Shredding paper.
• Chopping wood.

What are the 7 signs of a chemical reaction?

• Gas Bubbles Appear. Gas bubbles appear after a chemical reaction has occurred and the mixture becomes saturated with gas.
• Formation of a Precipitate.
• Color Change.
• Temperature Change.
• Production of Light.
• Volume Change.
• Change in Smell or Taste.

Cooking the egg is an example of a chemical change.

Cooking of food is a chemical change because after cooking, the raw ingredients or the vegetables cannot be regained again.

What is a chemical change? (tearing, chopping, shredding, boiling water are all physical changes; cooking pasta is a chemical change).

Rain formation is a physical change because it involves only a change in the physical state of water due to change in temperature but chemical properties remain same.

The boiling of water is not a chemical change. If it boils for more time it changes to vapour state which is a physical change. Whereas boiling of egg, burning of paper and cloth involves both physical and chemical change. Burning of paper and cloth forms ash.

In a physical change the appearance or form of the matter changes but the kind of matter in the substance does not. However in a chemical change, the kind of matter changes and at least one new substance with new properties is formed. The distinction between physical and chemical change is not clear cut.

The changes in which new substance are formed,are called chemical changes. In a chemical change,the substances involved change their identity ie they get converted into entirely new substance. For Ex:Burning of magnesium ribbon,Rusting of iron,Formation of curd from milk,Cooking of food etc.

Cooking of food, boiling of eggs are examples of both physical and chemical changes. In both cases, the physical appearance of the substances change and new substances are formed.

A change in color is also another characteristic of a chemical reaction taking place. For example, if one were to observe the rusting of metal over time, one would realized that the metal has changed color and turned orange. This change in color is evidence of a chemical reaction.

A physical change occurs when there is a change in physical properties of a substance but not chemical compostion. Common physical changes include melting, change of size, volume, color, density, and crystal form.

Temperature Change Chemical reactions that involve making bonds release energy, which makes the surroundings hotter. An example of a temperature change in a chemical reaction is when a burning fire produces heat.

Melting a sugar cube is a physical change because the substance is still sugar. Fire activates a chemical reaction between sugar and oxygen. The oxygen in the air reacts with the sugar and the chemical bonds are broken. Iron (Fe) rusts when it is exposed to oxygen gas in the air.

In principle, all chemical reactions are reversible reactions . This means that the products can be changed back into the original reactants .