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Questions and Answers
What are the three states of matter and their characteristics?
What are the three states of matter and their characteristics?
The three states of matter are solid, liquid, and gas. In a solid, particles are tightly packed and have a fixed shape and volume. In a liquid, particles are close together but can move past one another, and it has a fixed volume but takes the shape of its container. In a gas, particles are far apart and move freely, and it takes both the shape and volume of its container.
What is the difference between a physical change and a chemical change?
What is the difference between a physical change and a chemical change?
A physical change is a change in the physical properties of a substance, such as shape, size, or state, without forming a new substance. Examples include melting ice or breaking a glass. A chemical change, on the other hand, is a change in the chemical composition of a substance, resulting in the formation of a new substance. Examples include burning wood or rusting of iron.
What is an element, a compound, and a mixture?
What is an element, a compound, and a mixture?
An element is a pure substance that cannot be broken down into simpler substances by chemical means. It is made up of only one type of atom. A compound is a pure substance composed of two or more elements chemically combined in a fixed ratio. A mixture is a combination of two or more substances that are not chemically combined and can be separated by physical means.
