1. Semester 1 slides from units 1-5 tests Also:
make sure to do notebook assignments for unit 6- there are many review questions
Density Measurement lab has questions for one of the open response
Midterm and Chapter 8 open response are also on the test

2. A. ions B. electrons C. protons AND neutrons D. protons
The Atomic Number is the total number of which particles in the nucleus?
A. ions
B. electrons
C. protons AND neutrons
D. protons
answer= D
Only protons and neutrons are in the nucleus. The atomic number is the number of protons or electrons in an atom. So D is correct

3. What is the next atomic orbital in the series 1s 2s?
A. 4s
B. 3p
C. 2p
D. 2s
C. This is the order
4p _ _ _
3d _ _ _ _ _
4s _
3p _ _ _
3s _
2p _ _ _
2s _
1s _ C

4. The sodium ion has a charge of positive one, has how many electrons would it have?
B.10
C.11
D.9
Sodium the atom has 11 for an atomic number, so it has 11 electrons. When it becomes a +1 ion it loses one electron, so has only 10.
answer=b

5. What does the number 14 in carbon-14 represent?
A.The charge
B.Number of electrons
C.Atomic Number
D.The mass number
Carbon is element #6 which tells the number of protons and electrons. The 14 is the mass number which is the sum of protons and neutrons.
answer=D

6. What is the electron configuration of Magnesium?
A) 1s2 2s2 2p3 3s2 3p6
B) 1s2 2s2 2p6 3s1
C) 1s2 2s2 2p6 3s2
D) 1s2 2s2 2p3 3s2 3p4 c
Mg has 12 electrons which is shown in C. [BTW: A and D don’t have the correct sequence.] open response has configuration!

7. What is the electron configuration of Magnesium ion?
A) 1s2 2s2 2p3 3s2 3p6
B) 1s2 2s2 2p6
C) 1s2 2s2 2p6 3s2
D) 1s2 2s2 2p3 3s2 3p4 c
Mg+2 ion has 10 electrons which is shown in B. [BTW: A and D don’t have the correct sequence.] open response has configurations!

8. Which of the following statements is not true?
A.Neutrons are located in the nucleus.
B. Ions are always positively charged.
C.The number of neutrons in Aluminum is 14.
D. Electrons is always the same number as the protons.
answer=b

9. Which of the following statements is not true?
A.Neutrons are located in the nucleus. true
B. Ions are always positively charged. Ions can also be negative
C.The number of neutrons in Aluminum is 14. Al has a mass of 27 - an atomic number of 13, to give 14 neutrons.
D. Electrons is always the same number as the protons in atoms. True [but not for ions]
answer=b

10. The sulfur ion, has a charge of negative 2, how many electrons does it have?
Sulfur has an atomic number of 16. To become a negative 2 ion, it would gain 2 electrons, so that is 18.
A) 20
B) 18
C) 16
D) 2 b

11. Given: Protons 23, mass 50, Electrons 23. What element is this?
A. Ti
B. Sc
C. V
D. None of these
Since there are 23 protons, the element is V because that is it’s atomic number. The mass can vary from the periodic table because there could be isotopes

12. What determines the atomic mass?
a.) Protons and Neutrons
b.) Weighted average of isotope masses
c.) Neutrons and Electrons
d.) None of the above
e) 2 of the above a
E both a and b.

13. What is the electron configuration of Aluminum?
a.) 1s2 2s2 2p2 3s23p24s1
b.) 1s2 2s2 2p6 3s23p1
c.) 1s2 2s2 2p6 3s23p2
d.) 1s2 2s2 2p6 3s23p24s1 b
B 13 electrons and correct sequence

14. How many valence electron are in a carbon atom?
D.4
d. 4 Check roman numerals on column heading d

15. True or false; 4 electrons are shared in a double covalent bond
A.True
B.False
Each bond is a shared pair of electrons. So 4 are shared in a double bond. a

16. Which combinations of elements will give molecular compounds?
A.metal+metal
B.metaloid+nonmetal
C.Nonmetal+nonmetal
D.metal+nonmetal
E.both B and C e E

17. How many valence electrons are in a nitrogen atom?
N has 5 valence electrons. Check the column heading roman numerals
A. 8
B. 4
C. 6
D. 2
E. none of these e

18. Which is not a poor conductor of electricity?
a) nonmetals
b) metals
c) transition metals
d) both b and c d
D. Note the “not”

19. What element is in the same period as Phosphorus?
A) Arsenic
B) Magnesium
C) Nitrogen
B period is “row” on periodic table and Mg is in the same row B

20. What does an Ionic compound look like at room temperature?
A B C a
A. Ionic compounds are crystals at room temp which are closely packed organized particles.

21. Which is an alkali metal?
A) Copper
B) Magnesium
C) Radon
D) Sodium
Sodium is in column 1 which are the alkali metals. Copper is a transition metal. Magnesium is alkali earth metal. Radon is a noble gas,Halogens column 7 d

22. a. Precision b. Accuracy c. Reproducibility d. Usefullness
The closeness of a measurement to its true value is a measure of its ______
a. Precision
b. Accuracy
c. Reproducibility
d. Usefullness a B

23. Which of the following is a physical change?
a. Corrosion
b. Explosion
c. Evaporation
d. Rotting Food C c

24. C. has a definite composition D. has a lower specific heat
A gallon of feathers has less mass than a gallon of water because it____
A. takes up more space
B. has less matter
C. has a definite composition
D. has a lower specific heat b B

25. What are the columns of the periodic table called?
A. orbitals
B. configurations
C. periods
D. families D d

26. What element in the second period has the smallest atomic radius?
A. lithium
B. potassium
C. neon
D. carbon
The second period is the second row. Since radius decrease left to right Ne is correct since it is the most right. c

27. A chemical change is involved in which of these processes?
A) Freezing
B) Evaporation
C) Rusting
C. note the change in color
Answer: C) Rusting

28. What is shown by a chemical formula?
A) How elements are joined in the compound
B) Total mass of reactants
C) Elements that are present in the compound
D) Ratio of elements present in the compound
Answer: D
Although C is correct, D is more correct and should be selected.

29. ( ) / Volume = Density. Fill in the blank
B. Do you think this would be on the final? Probably not, expect to have to calculate one of the variables
A. Weight
B. Mass
C. Length
D. Temperature

30. If the mass of a block = 40. 25kg & volume = 3
If the mass of a block = 40.25kg & volume = 3.38L, what is the density?
A) 42 kg/L
B) 11.9 kg/L
C) 0.08 kg/L
40.25/3.38 = 11.9 kg/L
Answer: B) 11.9

31. How do you determine an isotope?
A) Interrogate it
B) See if the number of protons is the same
C) See if the neutrons are the same B B

32. Helium is in what state of matter at room temperature?
A) Nothing
B) Everything
C) Plasma
D) Gas
He is in the noble gas family.
Answer: D) Gas

33. What could be the units for Density?
A.) mL/grams
B.) grams
C.) m2
D.) g/mL
Needs to be mass / volume
Answer: A

34. Sulfur Periodic Symbol Is...
A.) Si
B.) K
C.) Na
D.) As
E.) S S
Answer: E

35. Which set of measurements are most precise?
B) 2,3,2,4
C) 100,10.0,100
D) 1,2,3,4,5,6,7
A because the difference is the smallest
answer = A

36. Which results are most precise?
B) r2 = 0.01
A because the r2 is near 1
answer = A

37. Which are most accurate if the accepted value is 350.
B because the average is most close to 350. BTW: D is most precise
A) 300, 250, 233
B) 349, 351, 350
C)3.55, 3.45, 3.50
D) 345, 345, 346
answer = B

38. The average is 346 which is 4 from the accepted. 4/350 *100 = 1.1%
Given the measurements 347, 345, 346. What is the percent error if the accepted value is 350.
The average is 346 which is 4 from the accepted. 4/350 *100 = 1.1%
A) 4
B) 99%
C) 1.1 %
D) 0.011
answer = C

39. How many unpaired electrons are in a Phosphorus atom
How many unpaired electrons are in a Phosphorus atom? Draw the orbital diagram to decide.
3p _ _ _
3s _
2p _ _ _
2s _
1s _
A. 0
B. 3
C. 1
D. 2 B

40. Which would definitely tell you that a chemical reaction has occurred?
A. Mixing two liquids makes a solid
B. Bubbles form
C. Color change
D. Solid changing to a liquid
E. Liquid changing to gas A A

41. What is the charge of a Anion?
A. No charge
B. Positive charge
C. Dependent on the size of the nucleus
D. Negative charge D D

42. If more solute is added to a solution
a-the concentration decrease
b-the mass of the solvent decreases
c-the solution becomes more concentrated
Concentration refers to the ratio of solute to solvent, so the solution would become more concentrated.
c-the solution becomes more concentrated

43. CO2 is an ionic compound.
A) true
B) False
Carbon and oxygen are both nonmetals, so this would be covalent
false

44. Which of the following is a compound?
A) H
B) H2O
C) H-3
D) CO2
E) B&D e E

45. All atoms of the same element have the same_____.
a. number of neutrons
b. number of protons
c. mass numbers
d. mass
B also known as atomic number
B. number of protons

46. Isotopes of the same element have the different...
a) number of neutrons
b) number of protons
c) mass number
d) mass
Same number of protons, mass and neutrons vary A

47. How many electrons does the fluorine ion have?
F is element 9, so the atom would have 9 electrons. F is in the column that forms -1 ions which happens by gaining an electron, so the correct answer is 10
A) 8
B) 9
C) 10
D) 2
c. 10

48. Which of the following statements correctly compares the relative size of an ion to its neutral atom?
a. The radius of a cation is identical to the radius of its neutral atoms.
b. The radius of an anion is smaller than the radius of its neutral atom.
c. The radius of an anion is identical to the radius of its neutral atom.
d. The radius of a cation is smaller than the radius of its neutral atom. D.

49. Which of the following statements correctly compares the relative size of an ion to its neutral atom?
a. The radius of a cation is identical to the radius of its neutral atoms. Cations are more small because they lose electrons
b. The radius of an anion is smaller than the radius of its neutral atom. Anions are more large because they gain electrons
c. The radius of an anion is identical to the radius of its neutral atom. Anions are more large because they gain electrons
d. The radius of a cation is smaller than the radius of its neutral atom. Cations are more small because they lose electrons D.

50. How many unpaired electrons are on a boron atom if you use the Dot diagram?
The answer is B Lauren Beabout

51. Which of the following is a homogeneous mixture
A) Coffee
B) Ice water
C) Water & Sand
D) Dust particles in Air
Homogeneous means “one phase” . Coffee is the only one that fits that description a

52. Which of the following are in the same period as lithium?
a) carbon
b) magnesium
c) sodium
d) hydrogen
Period means “row” on periodic table, so Carbon is correct A

53. Which of the following covalent bonds in the most polar?
A. H-Br
B. H-I
C. H-F
D. H-Cl
Electronegativity is most great at the top of a column, so HF has the biggest difference
Answer : c

54. A molecule with a double covalent bond is
A molecule with a double covalent bond is? Hint: draw the electron dot diagram.
See p 218 and table 8.1
A. H2O
B. Cl2
C. O2
D. N2 C

55. Which combinations of elements will give ionic compounds?
a.) metalloid+non-metal
b.) non metal+non metal
c.) metal + metal
d.) metal + non metal
e.) more than one of these
answer: D D

56. A bond formed between a silicon atom and an chlorine atom is likely to be...
a.) non polar covalent
b.) ionic
c.) polar covalent
Silicon is a metalloid and chlorine is a nonmetal so covalent. Cl is to the right of Si, so it has a higher electronegativity which makes the bond polar
answer: c