Chemistry 1-3 Exam

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315 Terms

1

All matter is composed of elements. Approximately how many elements are there?

100

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2

What type of element has the following general properties: solid at room temperature, high luster, good conductor of heat and electricity, malleable and ductile?

metal

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3

An ion is an electrically charged atom or group of atoms.

true

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4

All gases exist as diatomic molecules

false

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5

Water is a chemical element

false

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6

More substances exist as compounds than as element

true

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7

elements are the basic building blocks of all substances

true

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8

The halogens are the only periodic group that contains all three phases of matter under normal conditions.

 

True

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9

Bromine is a solid at room temperature.

False

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10

Groups or families of elements are arranged in rows in the periodic table. These elements have similar chemical properties.

 

False

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11

The elements in Groups 1B – 8B are known as the transition elements.

 

True

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12

Alkali metals are shiny, ductile, good conductors of heat and not very reactive.

 

False

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13

Which type of element has the following general properties: low melting point and density, lacks luster, poor conductor of heat and electricity, and brittle?

 

nonmetal

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14

List the following in order of increasing number of oxygen atoms represented:

A) 12 CaCO3

B) 8 Ca(OH)2

C) 6 Ca3(PO4)2

D) Ca(NO3)2

 

D < B < A < C

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15

On the periodic table vertical columns contain elements with similar properties. These vertical columns are called ___.

groups

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16

The elements on the current periodic table are placed in order of increasing ___.

 

atomic number

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17

The halogens are in group ___.

7A

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18

The alkaline earth metals are in group ___.

2A

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19

The alkali metals are in group ___.

1A

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20

Which of the following is a member of noble gases?

 

neon

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21

Which symbol represents a transition metal?

 

Tc

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22

Which is a nonmetal?

S

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23

The smallest particle of an element that can exist is called a(n) ___.

atom

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24

Which is a metalloid?

B

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25

Which element is not reactive?

 

Neon

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26

Which element forms diatomic molecules?

 

Chlorine

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27

Which element forms diatomic molecules?

 

Bromine

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28

A distinct substance composed of two or more elements combined chemically in a definite proportion by mass is a

 

compound.

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29

The charge of a cation is ___.

 

positive

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30

The symbol for cobalt is ___.

 

Co

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31

How many different elements are present in the compound CoCl2?

2

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32

How many different elements are present in the compound Fe2(SO4)3?

3

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33

How many atoms of oxygen are indicated in the formula Fe(NO3)3?

9

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34

The smallest particle of an element that can enter into a chemical reaction is a(n) ___.

atom

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35

How many atoms are indicated in the formula Ca3(PO4)2?

13

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36

What is the total number of hydrogen atoms present in the compound CH3COOH?

4

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37

What is the total number of atoms present in the compound represented as Mg(NO3)2?

9

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38

How many atoms of hydrogen are present in the compound represented as Al(H2PO4)3?

6

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39

Which of the following is a compound?

water

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40

What is the total number of oxygen atoms present in Fe2(SO4)3?

12

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41

Which is a characteristic of all nonmetals?

 

poor conductors of heat

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42

The number of nonmetallic atoms in Al2(SO3)3 is ___.

12

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43

If an element is a metal, one would expect it to be

ductile

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44

Which would be used in semiconductors?

 

silicon

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45

Most elements are rare. How many elements make up approximately 99% of the mass of the earth’s crust, oceans, and atmosphere?

10

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46

K is the symbol for the element ___.

potassium

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47

Which of the following represents an element?

N2

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48

Which is not a characteristic of metals?

brittle

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49

Which of the following formulas contains the fewest oxygen atoms?

Na2CO3

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50

The formula C3H5(OH)3 contains

 

14 total atoms.

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51

The symbol for one crystalline form of sulfur is S8. This symbol indicates

 

one molecule composed of eight atoms.

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52

Which of the following is an anion?

Cl-

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53

Which element is not a gas at normal temperature and pressure?

carbon

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54
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55

Which of the following is a cation?

 

Fe+3

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56

The symbol P corresponds to the element ___.

phosphorus

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57

The most abundant element in the earth’s crust, oceans, and atmosphere is ___.

oxygen

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58

Which does not exist as diatomic gas?

bromine

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59

Which of the following is a metalloid?

Si

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60

Which of the following is the correct symbol for iron?

Fe

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61

Which of the following cannot be broken down by chemical or physical means?

element

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62

Which element is malleable, ductile, and a good conductor of electricity?

Au

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63

Which element is brittle and a poor conductor of electricity?

S

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64

The smallest uncharged individual unit of a compound is a(n) ___.

molecule

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65

The ultimate particle of water is a(n) ___.

molecule

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66

An ionic compound is held together by

 

attractive forces between ions of different charges.

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67

How many atoms of calcium are indicated in the formula Ca(NO3)2?

1

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68

Which element is a liquid at room temperature?

Bromine

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69

The nitrate group is NO3. How many nitrate groups are in the formula NaNO3?

1

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70

The sulfate group is SO4–2. How many sulfate groups are in the formula Fe2(SO4)3?

3

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71

Palladium is a member of the

 

transition metals.

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72

How many hydrogen atoms are in the molecule C3H5(OH)3?

8

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73

Which cannot be broken down chemically or physically into a simpler substance?

copper

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74

Which is the most abundant element in the universe?

hydrogen

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75

Which chemical symbol is properly written?

Cu

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76

Which of the following is a noble gas?

argon

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77

Which of the following is an alkali metal?

sodium

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78

Which of the following is an alkaline earth metal?

magnesium

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79

Which element is a liquid at room temperature?

mercury

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80

Which of the following is a halogen?

chlorine

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81

Which of the following is a transition element?

manganese

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82

Which of the following elements is from a representative group?

S

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83

Which element of the following is most similar to calcium?

strontium

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84

Which element of the following is most similar to bromine?

chlorine

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85

Which of the following is best classified as a semiconductor?

boron

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86

Which of the following does not exist as a diatomic gas?

argon

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87

What is the symbol of the element that is classified as a metalloid and is in Group IVA and period 3?

Si

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88

Element with the atomic number 24 can be described as

 

ductile.

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89

What is the atomic number of potassium?

19

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90

The majority of the elements are ___.

metals

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91

What is the name of the element with an atomic number of 24?

chromium

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92

What is the symbol of the element that is classified as an alkali metal and is in period 4?

K

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93

What is the name of the element with an atomic number of 80?

mercury

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94

One of the properties of metals is their ductility. This means that

 

they can be drawn into wires.

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95

Which of the following alternatives does not represent a molecule?

Ga

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96

Consider the chemical formula for one molecule of methane, CH4. If instead of one molecule we had 10 molecules of methane, how many carbon atoms would be present?

10

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97

Consider the chemical formula for one molecule of table sugar, C12H22O11. If instead of one molecule of sugar we had 5, how many oxygen atoms would be present?

55

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98

Consider the chemical formula for one unit of aluminum sulfate, Al2(SO4)3. How many total atoms would be present in 22 units of aluminum sulfate?

374

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99

One unit of potassium oxide contains 2 atoms of potassium for every atom of oxygen. What is the chemical formula for potassium oxide?

 

K2O

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100

One unit of aluminum sulfide contains 2 atoms of aluminum for every three atoms of sulfur. What is the chemical formula for aluminum sulfide?

 

Al2S3

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