Chemistry Midterm Exam

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Which group of the periodic table is composed of inert (not reactive) gases?

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1

Which group of the periodic table is composed of inert (not reactive) gases?

Noble gases

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2

Electrons occupy orbitals of lowest energy first is part of what electron configuration rule?

Aufbau's Principle

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3

Anions are ______ ions.

negative

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4

What does the nucleus of an atom contain?

Protons and neutrons

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5

The students measured length during a science experiment, they got 12cm. But the actual measurement was 14.25cm. What was the percent error?

15.79%

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6

The Alkali metals have ______ valence electron

1

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7

What atom matches this electron configuration? 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10

Zinc

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8

Ionization energy is...

how much energy it takes to remove an electron from an atom

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9

Contributes basically no mass to an atom.

electrons

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10

What are the units for molar mass?

grams/mole

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11

For a principle quantum number "n", equal to 6, is it possible for "l" to be equal to 7?

No

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12

What do atoms of metals tend to do with their valence electrons when bonding with non-metals?

Donate them

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13

Which has the greater EN?

Cl

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14

How many molecules are in 2.5 mol of NaCl?

1.51x10^24

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15

Which group of METALS is the most reactive?

Group 1 - Alkali Metals

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16

He determined the mass of an electron and confirmed it's charge in 1909 as a result of oil drop experiments.

Millikan

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17

Each column in the periodic table is called a

group

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18

How many sig figs in the number 5.1 x 10^5?

2

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19

Convert 5cm to mm:

50mm

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20

The attendance for the basketball game was estimated to be 15,000 people but 12,500 people attended. What was the percent error?

20%

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21

The atom with the largest atomic radius in Group 18 is -

Rn

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22

Elements are

identified by very specific physical and chemical properties; substances that cannot be broken down to any other substance by physical or chemical means; represented by one or two letter symbols organized in the Periodic Table

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23

For a p sublevel, "L" equals ______

1

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24

Nonmetals ________ electrons when they become ions.

Gain

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25

As you move down the periodic table atoms get bigger. This is because _______

The atoms have more energy levels.

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26

At _______ degrees Celsius water freezes into a solid.

0

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27

The density of this material is 2g/cm^3. There are 24cm^3 Find the total mass.

48g

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28

What atom is represented by 35 protons, 45 neutrons, and 35 electrons?

Bromine

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29

An atom's overall charge is __________.

neutral

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30

What is the noble gas electron configuration for sulfur?

[Ne] 3s^2 3p^4

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31

Jack has a rock. The rock has a mass of 14g and a volume of 2cm^3. What is the density of the rock?

7g/cm^3

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32

What is the mass of one mole of aluminum?

26.982 g

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33

If quantum number "n" = 3, what are the possible values for "L"

0,1,2

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34

The temperature of the room is decreasing by 4 degrees Celsius.

Quantitive

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35

Which has the greater EN:

F

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36

Group 2 on the periodic table is known as

alkaline earth metals

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37

The atomic number tells you what?

number of protons

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38

Which atom has the largest atomic radius?

Francium

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39

How many orbitals are there in the "d" sublevel?

5

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40

How many valence electrons does hydrogen have?

1

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41

Valence electrons are

electrons farthest from the nucleus

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42

How many neutrons in C-14?

8

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43

Which has the greater EN: N or C?

N

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44

J.J. Thomson provided evidence that an atom...

contains negatively charged particles

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45

Elements that are soft, extremely reactive metals are part of what group?

Alkali Metals

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46

You know 16 cups = 1 gallon. Convert 3.5 gallons into cups.

56 cups

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47

This is a negatively charged particle found outside the nucleus

Electron

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48

The atomic number for Oxygen is 8, so

there are 8 protons in the atom

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49

How many valence electrons are in an atom of P?

5

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50

Alkaline Earth Metals have how many valence electrons?

2

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51

How many electrons can occupy any one orbital?

2

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52

True or False: The majority of an atom is made up of empty space

True

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53

What is an atom?

the basic particle from which all elements are made

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54

Which scientist conducted experiments using alpha particles and thin gold foil, which later helped him develop his model for the atom?

Ernest Rutherford

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55

The photoelectric effect only occurs if the light shining on the metal is:

above a minimum frequency

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56

Metals ________ electrons when they become ions

lose

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57

Which periodic group has the smallest atomic radius?

Noble gases

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58

How many neutrons does the isotope of lithium have?

5

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59

How many minutes are in a year?

525,600 min

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60

Convert from meters to cm: 9 meters

900 cm

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61

This particle is found in the nucleus and has a positive charge

proton

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62

What scientist is best known for his "Plum Pudding" model of the atom?

J.J. Thomas

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63

As you move across the periodic table atoms tend to get smaller because, _________.

the atoms have more protons

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64

What is this element? [Ar] 4s^2

Calcium

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65

How many electrons can the first energy level hold?

2

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66

What charge will a Beryllium ion have?

2+

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67

Which is an example of a physical property of matter?

Water freezing to ice

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68

How did Rutherford discover the proton?

Gold foil experiment

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69

Which class of electromagnetic radiation has the least energy?

Radio

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70

Trey is the fastest runner in the class!

qualitative

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71

Which of the following will have a lower ionization energy than Scandium (Sc)?

Calcium (Ca)

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72

The mass of a lead cube is 64 grams. This is an example of

physical extensive property

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73

How many protons are in an atom of magnesium?

12

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74

What atom matches this electron configuration? 1s^2 2s^2 2p^6 3s^2

Magnesium

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75

What is the "L" quantum number for an f orbital?

3

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76

Is melting butter for popcorn a chemical or physical change?

physical

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77

How many sig figs in the number 100.010?

6

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78

Which physical property of matter describes the relationship between mass and volume?

density

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79

How many valence electrons does oxygen have?

6

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80

When a measurement is repeatable and consistent it is said to have...

High precision

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81

What atom matches this electron configuration? [Xe] 6s^2 4f^14 5d^9

Gold

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82

How many valence electrons does Sulfur have?

6

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83

What quantum number describes the energy level of an orbital?

n

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84

All matter is made of what?

atoms

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85

Who was awarded the nobel prize for his work on the photoelectric effect?

Albert Einstein

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86

The Law of Conservation of Matter states that

matter is neither created nor destroyed in any process

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87

John Dalton wrote postulates to make the idea of the atom useful. Which postulate below was proven wrong?

All elements are made up of tiny indivisible particles called atoms.

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88

Which of the following will have a larger radius than Zinc?

Strontium

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89

What charge will an aluminum ion have?

3+

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90

The atoms along the staircase are called

metalloids

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91

For a principle quantum number, "n", equal to 2, what is the total electron capacity of that level?

8

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92

How close a measurement is to the true value is called...

Accuracy

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93

Convert 8 kilometers to meters

8,000 meters

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94

Physical properties of a substance include _______

color, odor and weight; density and specific gravity; melting point, boiling point and hardness

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95

Elements in a _______ have similar chemical properties.

group

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96

Who stated that all atoms of the same element are exactly alike?

Dalton

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97

Which is a halogen

Chlorine

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98

The lines in the emission spectrum for hydrogen are formed from _________.

energy given off when the electron moves from higher energy levels to lower energy levels

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99

How many valence electrons are in an atom of Ba?

2

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100

Which is NOT an example of a physical property of matter?

ability to rust

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