Vocabulary

2. a chemical bond that forms when atoms share electrons
3. the sum of the number of protons and neutrons in an atom
5. a substance containing a hydrogen atom and produces hydronium ion when dissolved in water
7. release energy as heat
9. negatively charged particle that occupies the space in the atom outside the nucleus
10. rate of change of velocity with time
12. the amount of space occupied by a 3-d object
15. an organic compound used by cells to store and release energy
23. an attractive force between all objects that have mass
24. a vector that represents an object's speed and direction
25. a pulling force applied to an object stretch
26. neutral particle located in the nucleus of an atom

1. a substance that can combine with hydrogen ions and produces hydroxide ions when dissolved in water
2. a squeezing force applied to an object that can make an object shrink
4. distance between any two crests or trough on a wave
6. an influence tending to change the motion of an object or produce motion in a stationary object
8. an atom that is no longer neutral because it has gained or lost electrons
11. the ability of a material to transfer heart or electricity
13. neutral particle that forms as a result of electron sharing
14. a tentative explanation that can be tested with a scientific explanation
16. occurred when a light ray changes direction as it passes from one material to another
17. the return of light, heat or sound after striking a space
18. absorbs energy as heat
19. one or two or more atoms of an element having the same number of protons in their nuclei but a different number of neutrons
20. mass per unit volume of a material
21. neutral particle that has no charge
22. a covalent compound made up of many small, repeating units linked together in a chain