exam_one_chem_100a

Elmhurst College Chem 100 Exam OneSeptember 17, 2007 Name_________________

Tally Sheet

Page Problem # Points Sum Actual2 1-103 11-204 21-305 31-356 36-447 Table7 Numbers8 Ions

conversionsAnswer key

1


SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question.

1)

How many neutrons are in this isotope of chlorine?

1)

_____________ 37

Cl 17

2)

Calcium has ________ valence electron(s).

2)

_____________

TRUE/FALSE. Write 'T' if the statement is true and 'F' if the statement is false.

3)

Radioactivity is the spontaneous emission of radiation from an unstable element.

3)

_______

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.

4)

A stream of electrons will behave in what way in an electric field?

4)

_______ A)

be unchanged

B)

be stopped C)

2

Elmhurst College Chem 100 Exam OneSeptember 17, 2007 Name_________________be deflected toward the negative electrode

D)

be deflected toward the positive electrode

5)

An anion is a

5)

_______ A)

positively charged ion.

B)

positive electrode. C)

negative electrode.

D)

negatively charged ion.


6)

Alpha particles are heavier than beta particles.

6)

_______

7)

Excited state electrons gain energy when they move to the ground state.

7)

_______


3


8)

Electrolytes are important substances in the chemistry of living systems. An electrolyte is a compound that

8)

_______ A)

conducts electricity when melted or taken into solution. B)

contains electrons. C)

generates light when electricity is applied. D)

contains electrodes.

9)

Which type of radioactivity has a negative charge?

9)

_______ A)

alpha, α

B)

beta, β

C)

gamma, γ

D)

delta, δ

10)

How many neutrons are in this isotope of tin?

4


10)

______ A)

50

B)

156

C)

106

D)

56

5


11)

Which statement comparing chemical and nuclear properties of isotopes is correct?

11)

______ A)

Isotopes have similar chemical and nuclear properties. B)

Isotopes generally have the same chemical properties, but often different nuclear properties. C)

Isotopes have different chemical and nuclear properties. D)

Isotopes have different chemical properties, but generally the same nuclear properties.

12)

Relative to the mass of the nucleus of an atom, the mass of the electrons is

12)

______ A)

always much smaller.

B)

dependent upon the element. C)

always much larger.

D)

about the same.

13)

Which type of radioactivity has a positive charge?

6


13)

______ A)

alpha, α

B)

beta, β

C)

gamma, γ

D)

delta, δ


14)

Gamma rays will be deflected in a magnetic field.

14)

______

15)

Most of the mass of an atom is located in the electrons of the atom.

15)

______

16)

The electron configuration for oxygen is 1 2 3 .

16)

______


17)

7

Elmhurst College Chem 100 Exam OneSeptember 17, 2007 Name_________________Ions are

17)

______ A)

electrons.

B)

neutrons.

C)

electrodes.

D)

charged atoms.


18)

Isotopes of an element have the same number of neutrons but a different number of protons.

18)

______


19)

How many nucleons are there in the sulfur-32 isotope?

19)

______ A)

48

B)

16 C)

32

D)

8


none of the above

20)

In which group do all atoms have seven valence electrons in the ground state?

20)

______ A)

halogens

B)

noble gases

C)

alkaline earths

D)

alkali metals

9


21)

Which element is in the same group as carbon?

21)

______ A)

Ge

B)

Al

C)

B

D)

P

22)

A horizontal row in the modern periodic table is called a

22)

______ A)

period.

B)

valence.

C)

branch.

D)

group.

23)

A vertical column in the modern periodic table is called a

10

Elmhurst College Chem 100 Exam OneSeptember 17, 2007 Name_________________23)

______ A)

group.

B)

branch.

C)

valence.

D)

period.

24)

Which is an IMPOSSIBLE electron configuration?

24)

______ A)

1s3 2s2 2p4

B)

1s2 2s2 2p4 3s1

C)

1s2 2s2

D)

1s2 2s2 2p4

25)

In the quantum mechanical view of the atom, electrons are confined to charge clouds called

25)

______ A)

11

Elmhurst College Chem 100 Exam OneSeptember 17, 2007 Name_________________energy levels.

B)

ions

C)

orbitals.

D)

orbits.

26)

Which of the following IS NOT characteristic of the line spectrum of an element? A line spectrum is

26)

______ A)

unique.

B)

continuous. C)

an energy profile.

D)

discrete.

27)

A line spectrum is to an element as a(n) ________ is to a person.

27)

______ A)

eye

B)

fingerprint

12


C)

brain

D)

ear

28)

When an electron in an excited atom "falls down" to a lower energy level, the excited atom emits a characteristic

28)

______ A)

neutron.

B)

photon.

C)

electron.

D)

proton.

29)

A neutral atom has the same number of

29)

______ A)

neutrons and protons.

B)

electrons and protons. C)

electrons and neutrons.

13


D)

electrons and nucleons.

30)

How many protons are there in a gold atom?

30)

______ A)

16

B)

79

C)

47

D)

38

14


31)

Which contains 14 neutrons?

31)

______ A)

B)

C)

D)

32)

The atomic number of an element is

32)

______ A)

equal to the positive charge of an atom's nucleus. B)

equal to the number of electrons in a neutral atom. C)

the number of protons in an atom. D)

All of the above are valid definitions.

15


33)

Which element has the same number of valence electrons as boron?

33)

______ A)

As

B)

Al

C)

P

D)

Li

34)

The noble gases are a unique group of elements. They are recognized as unique due to the fact that they are

34)

______ A)

all gases at room temperature.

B)

named after Nobel prize winners. C)

the most reactive member of their period.

D)

extremely stable and unreactive.

35)

Carbon has ________ valence electrons.

16

Elmhurst College Chem 100 Exam OneSeptember 17, 2007 Name_________________35)

______ A)

one

B)

two

C)

four

D)

three

17

36. What is the volume of one quart of water in liters?

37. What is the weight of one quart of water in grams?

38. What is the weight of one liter of water in grams?

39. What is the density of water? State your answer with the proper units of density.

40. Show the electron configuration for Phosphorus in the electroneutral state.

41. Show the electron configuration for a Phosphorus atom that has gained three electrons

42. Show the electron configuration for a Potassium atom in its electroneutral state.

43. Show the electron configuration for a Potassium atom that has lost one electron.

44. What electroneutral atom electron configuration is represented by both:

the Potassium atom that has lost one electron and the Phosphorus atom that has gained three electrons?

Answer Key For Exam:

1)

20

2)

two

3)

TRUE

4)

D

5)

D

6)

TRUE

7)

FALSE

8)

A

9)

B

10)

D

11)

B

12)

A

13)

A

14)

FALSE

15)

FALSE

16)

FALSE

17)

D

18)

FALSE

19)

C

20)

A

21)

A

22)

A

23)

A

24)

A

25)

C

26)

B

27)

B

28)

B

29)

B

30)

B

31)

D

32)

D

33)

B

34)

D

35)

Elmhurst College Chem 100 Exam I Name______________________ Date _______________________

C

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exam_one_chem_100a

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c electrons

b electrons

c b d p

d electrons

b neutrons

c isotopes

b isotopes

d isotopes