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High School Chemistry: Homework Help Resource

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❶Dissolving a solid into a liquid.

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Matter is anything that takes up space and has mass. Everything you see around us is made up of matter. What is matter made of? In , John Dalton was able to show that matter is made up atoms or atoms combined in molecules. An atom is the smallest unit of an element that can exist alone or in combination with other atoms of the same or different elements. There are three kinds of particles that have been found to form the basic structure of matter.

These particles are called atomic and sub- atomic particles they include:. Protons are positively charged particles. The positive electron change on each proton is the same as the negative charge on electron. Electrons are extremely light particles. Each electron has unit negative electric charge.

These are particles that are electrically neutral. A neutron has the same mass as a proton. A molecule is the smallest particle of an element or a compound and has all the properties of that element or compound.

A substance made of just one kind of atom is known as element. Iron is an element. Iron is the only element made up of iron atoms. Gold is an element made up of gold atoms. On the basis of physical and chemical properties, elements can be classified into two main groups: About 75 per cent are metals. Metals are usually shiny.

They are good conductors of heat and electricity. They can be bent or hammered into different shapes. On the other hand non- metals are generally liquids and gases at room temperature.

Non- metal solids usually have dull shapes. They are poor conductors of heat and electricity. When atoms of different elements combine chemically, they form compounds. Scientists has discovered about four million compounds formed from two or more of elements. All sugars are made up of three kinds of elements.

These elements are carbon, hydrogen and oxygen. Each compound of sugar form when a certain number of carbon, hydrogen and oxygen atoms join in a certain way.

Matter is always changing.

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Chemistry homework help Chemistry homework can become a real challenge for students, who are not good at science or had to miss classes due to illness or travelling. It is also quite a complex task for those, who are not sure whether their homework is correct and want to get help with chemistry.

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