1. Final Review!

2. What is the difference between accuracy and precision?

3. Who is more electronegative, Bromine or Chlorine. Why
Who is more electronegative, Bromine or Chlorine? Why?? Give the electron configuration for an atom of this element.

4. Who has a higher ionization energy, Nitrogen or Oxygen. Why
Who has a higher ionization energy, Nitrogen or Oxygen? Why? Give the electron configuraiton.

5. 16 For an ion with isotope symbol, 32 S -2 How many protons?
How many neutrons?
How many electrons?
What is the difference between an ion and an atom? What is the difference between an atom and an isotope?

6. Write the electron configuration for atoms of the following elements
Phosphorus Chromium

7. Name that principle
________ principle - electrons enter the lowest energy first.
___________Principle - 2 electrons max per orbital - opposite spins
_________’s Rule- When electrons occupy orbitals of equal energy, they don’t pair up until they have to.

8. How many electrons maximum can be held in the third energy level of an atom?

9. % Composition
Calculate the Percent Composition by Mass of Sulfur in Calcium Sulfite

10. Empirical Formula
What is the empirical formula of a compound if it is 62.1% C, 13.8% H, and 24.1% N?

11. Molecular Formula
Find the molecular formula of ethylene glycol (antifreeze). The molar mass is 62 g/mol and the empirical formula is CH3O.

12. Write the formula for the following compounds
Strontium nitrate Tin (II) oxide Carbon tetrafluoride Chromium (VI) carbonate

13. Draw structures, identify molecular geometry(shape), and polarity of the following molecules:
H2S CH3Cl NH3

14. How many molecules are in a 14.0 g sample of CH4?

15. Write a balanced chemical equation for the following reaction
Magnesium reacts with hydrochloric acid to produce magnesium chloride and hydrogen gas

16. If 12 grams of Magnesium reacts with an excess of hydrochloric acid, how many molecules of hydrogen gas are produced?

17. Write a balanced chemical eqn, idenify the limiting reactant, and determine the theoretical yield of nitrogen trihydride.
23 grams of nitrogen gas react with 28 grams of hydrogen gas to produce nitrogen trihydride.

18. Differentiate between pure substances and mixtures
Differentiate between pure substances and mixtures. Give two examples of each of the following: elements, compounds, suspensions, solutions, colloids.

19. List three ways to decrease reaction rate.

20. In the following reaction, what is the base?
HBr + KOH  KBR + H2O

21. A high ph indicates…..
An Acid
A Base
Salt
Water

22. What makes a solution an Arrhenius Base??

23. Indicators
Name an indicator and what would happen if it was in a basic solution.

24. According to the bronsted- lowry theory, a substance that accepts a proton in a chemical reaction is a (an)….. Base Acid Water

25. Identify the following substances as acidic, basic or neutral
pH of 12
Sour taste
Changes litmus paper blue
Has high concentration of hydroxide ions (OH-1)
pH of 3
Corrosive
pH of 7

26. A solution that maintains a stable ph level would contain which of the following?
pH indicator
Acid
Buffer
Water

27. Is a solution with a ph of 2 a stronger or weaker acid than a solution with a ph of 4? How much stronger/weaker of an acid is it?

28. A gas sample at a constant pressure shrinks to one-fourth its initial volume. What must have happened to its temperature? Did it increase or decrease? By what factor did the Kelvin temperature of the gas change?

29. A gas occupying 2. 5 L at 25°C exerts a pressure of 0. 98 atm
A gas occupying 2.5 L at 25°C exerts a pressure of 0.98 atm. What volume will it occupy if the temperature is increased to 45°C and the pressure is decreased to 93 kPa?

30. If a basketball stored in the garage contains 10
If a basketball stored in the garage contains 10.0 L of gas at a temperature of 20°C, what will the volume be if it is brought outside into temperatures of 0°C.

31. Liquids that have very high vapor pressure would likely have
Strong intermolecular forces
Weak intermolecular forces
No intermolecular forces
Very large molecules

32. Calculate the mass, in grams, of ice that can be melted when 8
Calculate the mass, in grams, of ice that can be melted when 8.7KJ of energy is applied to a sample of ice at 0 0C