Question

matter - properties and changes
a liquid is a form of matter that flows, has constant volume, and takes the shape of its container. water, blood, mercury

1. list 3 common states of matter and give the definition and characteristics of each.

a solid is a form of matter that has its own definite shape and volume. wood, iron, paper
a gas is a form of matter that not only flows to conform to the shape of its container but also fills the entire volume of its container. the gas will expand to fill the container.

1. ____________ a chemical combination of two or more different elements. can be broken down into simpler substances by chemical means and has properties different from those of its component elements.
2. an element ____________ a pure substance that cannot be broken down into simpler substances by physical or chemical means.
3. ____________ the technique you would use to separate sand from water.
4. ____________ the grid organizing elements into periods and groups.
5. define the law of conservation of mass. state that mass is neither created nor destroyed during a chemical reaction - it is conserved.
6. ____________ a separation technique that results in the formation of pure solid particles from a solution.
7. compare and contrast the terms chemical property and physical property.
8. compare and contrast the terms substance and mixture.

Explanation:

1. Solids have definite shape and volume. Liquids have constant volume and take container - shape. Gases fill container's volume and take its shape.
2. A compound is a chemical combination of different elements, breakable by chemical means with distinct properties.
3. An element is a pure substance not breakable into simpler substances physically or chemically.
4. Filtration is used to separate sand from water as sand is insoluble and can be trapped by a filter.
5. The periodic table is the grid organizing elements into periods and groups.
6. The Law of Conservation of Mass states mass is conserved in chemical reactions, neither created nor destroyed.
7. Crystallization is a separation technique that forms pure solid particles from a solution.
8. Chemical properties involve chemical changes, like flammability. Physical properties are observable without chemical changes, like color.
9. A substance has a fixed composition. A mixture has variable composition and components can be separated physically.

Answer:

1. Solid: A form of matter with definite shape and volume (e.g., wood, iron, paper). Liquid: A form of matter that flows, has constant volume, and takes the shape of its container (e.g., water, blood, mercury). Gas: A form of matter that not only flows to conform to the shape of its container but also fills the entire volume of its container (e.g., air).
2. Compound
3. An element is already defined in the question text as a pure substance that cannot be broken down into simpler substances by physical or chemical means.
4. Filtration
5. Periodic table
6. Mass is neither created nor destroyed during a chemical reaction - it is conserved.
7. Crystallization
8. Chemical property: Relates to a substance's ability to undergo chemical changes. Physical property: Relates to a substance's observable characteristics without chemical change.
9. Substance: Has a fixed, definite composition. Mixture: Has a variable composition and components can be separated physically.