Sorting Materials Into Group

TRUE

Lock and steel glass.

FALSE

Hardness and soluble or insoluble.

Soft materials are those which can be compressed or scratched easily.

Cotton and sponge.

Iron and wood.

Lustre and hardness

Hard

Substances that completely disappear or dissolve in water are said to be soluble in water.

TRUE

TRUE

Oxygen.

FALSE

Float

Opaque

Leaf and paper

Sink

Transparency

Transparent

Hard

Wooden box and metal container.

TRUE

Translucent.

FALSE

TRUE

Translucent

FALSE

The materials through which we are not able to see are called opaque.

Stone and coin

Transparent

TRUE

Basket ball

Water

Water, glass

TRUE

FALSE

Gold, Silver and copper have luster while sulphur has no lustre

Water can dissolve salt because the positive part of water molecules attracts the negative chloride ions and the negative part of water molecules attracts the positive sodium ions.

Laptop is made up of various synthetic fibers.

Furniture can be made from materials like wood, plastic or steel.

Objects around us are made up of a large variety of materials such as paper, glass, plastic, cloth, wood, metal, mud, soil, cotton, etc.

Objects around us are made up of a large variety of materials. An object could be made of a single material or of many different types of materials.

Rubber, plastic and diamonds are non conductors they can’t conduct electricity. Iron is conductor of electricity.

Square can never be round.

Circle has no edge. Triangle, Square and Rectangle has two or more edges.

Bed, table, almirah can be made up of wood and has glass in it.

Orange and apple are fruits so eatable. Sugar is obtained from sugarcane and is used as sweetener in food and drinks so eatable. A globe is a three-dimensional, spherical, scale model of Earth usually made from some materials like plastic etc. so not eatable.

Stone, Wood, Lunch box are materials. Chocolate are eatables made from milk, cocoa powder etc.

Chair, Table and Bed are group of non-livings while human is living.

Earthen pitcher, steel glass and mug are used to keep liquids while Lunch box is used to keep solids.

Rose, Jasmine and Lily grows on land while Lotus in water.

Coconut Oil, Soya bean Oil and Olive Oil are oils extracted from plants while Fish oil is extracted from animal.

Mango, Apple and Banana are grown on tress while Grapes is grown on vines.

Bed sheet, pillow and curtain are home furnishing products while dress is type of clothes.

Ans: b.

Combustible materials burn in the presence of air.

Ans: c.

Iron, copper and wood cannot be compressed or scratched easily as they are hard.

Compression is the application of balanced inward ("pushing") forces to different points on a material or structure, that is, forces with no net sum or torque directed so as to reduce its size in one or more directions.

Solubility is a chemical property referring to the ability for a given substance, the solute, to dissolve in a solvent.

Butter Paper is considered translucent since it allows light to travel partially through it.But some thick papers are opaque. Because it allows only partial light to pass through it,so we cannot see things clearly. Hence, it is considered as a translucent material.

It weighs less than an equal volume of water, it is less dense and will float.

Because mercury's density is very high, objects that you might consider heavy, such as lead weights or a steel ball bearing will float in it. Anything denser than 13.55 grams per cubic centimeter (density of mercury) will sink in mercury. Density of gold is 19.3 gm/cubic cm.

Glass is transparent, while stone is opaque. Light passes through water so its transparent while light does not passes through stone so it's opaque.

A simple solution is basically two substances that are evenly mixed together. One of them is called the solute and the other is the solvent. A solute is the substance to be dissolved (sugar). The solvent is the one doing the dissolving (water).

Because of their magnetic properties magnetic materials are used in electronic devices.

Since Gold, Iron and Mercury are denser than kerosene, they will sink in kerosene. Wax being lighter than kerosene will float.

Glass because of its property of breakage could be hazardous using as shoe material.

Iron being metal is lustrous in nature.

Opaque objects does not allow light passes through them so you cannot see through them.

Transparent objects are those that allow large quantities of light to pass through; air, water and shiny glass are all examples of transparent materials. Transparent objects vary in the amount or types of light that they let through their surfaces.

Closed wooden box, a cardboard carton and metal containers does not allows light passes through them or see through them. So they are opaque objects.

A sponge is a tool or cleaning aid consisting of soft, porous material. So easily compressible.

Steel spoon is made from metal Steel. Steel has property of luster which makes it shine.

Sand is heavier than water when the volume of both substances is equal. The density of dry sand is between 80 and 100 pounds per cubic foot, whereas water is 62 pounds per cubic foot.

Opaque object are those which do not allow light pass through it. When you place a lighted torch light passes through one’s palm. So it is translucent.

Materials are grouped together on the basis of similarities and differences in their properties.Things are grouped together for convenience and to study their properties.

Sugar is dissoluble in water.

Aluminum foil provides a complete barrier to light, oxygen, moisture and bacteria. For this reason, foil is used extensively in food and pharmaceutical packaging. Hence it is opaque in nature.