Chemistry

3. a pure substance that forms when two or more elements are held together by a chemical bond (every molecule of a compound is the same)
5. a solid that forms during a chemical reaction that takes place in a solution.
7. a combination of two or more substances that are not chemically combined.
8. elements classified by physical properties that include shininess, malleability,ductile and conductivity.
9. a pure substance that is made up of only one kind of atom.
10. an atom that has lost or gained an electrons and therefore has an electrical charge.
12. a mixture in which substances are distributed evenly ( you cannot see the different parts)
14. the tendency of a substance to undergo chemical change.
16. used to describe a material that can be hammered or beaten into thin sheets.
18. a scientific principle that matter is neither created nor destroyed during a chemical change.
21. in a solution , the substance that dissolves.

1. an element that has physical and chemical properties both metals and nonmetals can be semi-conducter
2. a vertical column of elements in the periodic table shows number of valance electrons.
4. a mixture in which substances are not distributed evenly (you can see the different parts)
6. the smallest component of an element having the chemical properties of the element ( smallest unit of matter)
11. a substance that is present at the beginning of a chemical reaction.
13. hard substance that will break or shatter easily.
15. he ability of a substance to be pulled into a wire.
17. a homogeneous mixture in which one substance completely dissolves in.
19. an element that usually is a gas or brittle solid at room temperature is not malleable or ductile is a poor conductor of heat and electricity and typically is dull.
20. a group of two or more atoms held together by chemical bonds.