2. Science 8 th Grade Chemical Interactions

3. 100 200 400 300 400 Choice1Choice 2Choice 3Choice 4 300 200 400 200 100 500 100

4. Row 1, Col 1 Each family in the periodic table has its own characteristic properties based on the number of ____________ or _________. Valence electrons or protons

5. 1,2 The attraction between similarly charged ions is called an ___________ bond. ionic

6. 1,3 When 2 atoms share electrons it’s called a ___________ bond. covalent

7. 1,4 The principle of conservation of mass states ___________. Matter can not be created or destroyed.

8. 2,1 Ions that are made of more than one atom are called__________. Polyatomic ions

9. 2,2 A covalent bond in which electrons are shared unequally is called _____________. polar

10. 2,3 Which particles of an atom are in the nucleus? Protons and neutrons

11. 2,4 In water, bases make ________. Hydroxide ions

12. 3,1 The electrons that bond between atoms are called_____________. Valence electrons

13. 3,2 The pH scale measures________. Concentration of hydrogen ions

14. 3,3 What happens when chemical bonds break and forms new bonds? Chemical reaction

15. 3,4 A chemical reaction will always show a ________________. New substance

16. 4,1 Neutralization is a reaction between an_____________and a ________. Acid, base

17. 4,2 The substances on the left side of a chemical equation are called the ______________. reactants

18. 4,3 A chemical reaction that absorbs heat energy is _________________ endothermic

19. 4,4 A neutralization reaction will make __________ and a _________. Water and a salt

20. 5,1 The number in front of a chemical formula and the number below an element’s symbol are called___________ and _______. Coefficient and subscript

21. 5,2 The minimum amount of energy needed to start a reaction is called the _______________ Activation energy

22. 5,3 In a water solution, how are acids and bases different? Acids form hydrogen ions/bases hydroxide ions

23. 5,4 What happens when an atom loses an electron? It becomes a positive ion