Properties of Matter

Question 1

How many electrons does a neutral potassium atom have?

Answer 1

19

Question 2

How many protons does silicon have?

Answer 2

14

Question 3

How many electrons does a neutral carbon atom have?

Answer 3

6

Question 4

Lavoisier’s Law of Conservation of Mass…

Answer 4

Encouraged scientists to use mass sparingly, as it is a limited resource and says that whatever mass you begin with in a reaction you will also end with.

Question 5

How many electrons does a potassium ion have?

Answer 5

18

Question 6

Carbon can combine with oxygen with a ration of 3 g C to 8 g O or 3 g C to 4 g O. This is an example of… ?

Answer 6

The law of multiple proportions developed by Dalton

Question 7

How many protons does gold have?

Answer 7

79

Question 7

How many neutrons does an average argon atom have?

Answer 7

22

Question 8

How many electrons does a chlorine ion have?

Answer 8

18

Question 9

Thompson’s Cathode Ray Tube

Answer 9

Discovered the electron

Question 10

Millikan’s Oil Drop

Answer 10

Measured the charge of the electron

Question 11

Rutherford Gold Foil

Answer 11

Proved there was a small, positive nucleus

Question 12

How many protons does beryllium have?

Answer 12

4

Question 13

How many electrons does a magnesium ion have?

Answer 13

10

Question 14

How many electrons does a neutral cobalt atom have?

Answer 14

27

Question 15

How many electrons does a sulfide ion have?

Answer 15

18

Question 16

Pure table salt (NaCl), no matter where it comes from, contains 39.3% Na (sodium) by mass. This is an example of… ?

Answer 16

The law of definite proportions by Proust

Question 17

How many protons does titanium have?

Answer 17

22

Question 18

How many protons does rubidium have?

Answer 18

37

Question 19

How many neutrons does an average Na atom have?

Answer 19

12

Question 20

How many neutrons does an average Calcium ion (with a 2- charge) have?

Answer 20

20

Question 21

How many neutrons does an average arsenic with a negative three charge have?

Answer 21

42

Question 22

How many valence electrons (dots) does oxygen have?

Answer 22

6

Question 23

How many valence electrons does Be have?

Answer 23

2

Question 24

What charge do protons have?

Answer 24

+1

Question 25

How many valence electrons does Cl have?

Answer 25

7

Question 26

What charge do neutrons have?

Answer 26

0

Question 27

What charge do electrons have?

Answer 27

-1

Question 28

The number of electrons in neutral atoms is equal to

Answer 28

number of protons

Question 29

The mass number of atom is equal to the sum of _______

Answer 29

the number of protons and electrons.

Question 30

Positive charge

Answer 30

subtract amount from electrons

Question 31

Negative charge

Answer 31

add amount of charge to electrons

Question 32

Metals

Answer 32

shiny, conducts electricity, conducts heat, positive charge

Question 33

Nonmetals

Answer 33

make negative charges, not shiny

Question 34

cation

Answer 34

charge to metals, positive

Question 35

anion

Answer 35

charge to nonmetals, negative

Question 36

ionic compound

Answer 36

metals and nonmetals

Question 37

metallic compound

Answer 37

metals and metals

Question 38

molecular compound

Answer 38

nonmetals and nonmetals

Question 39

number of electrons in an element

Answer 39

how far over they are horizontally

Question 40

when combining 2 elements they always need to become

Answer 40

0 electrons

Question 41

full outer shell

Answer 41

8 electrons

Question 42

physical change

Answer 42

doesn't change chemical compound

Question 43

chemical change

Answer 43

changes the chemical compound

Question 44

All elements want 8 electrons except

Answer 44

hydrogen and helium

Question 45

the center atom can never be

Answer 45

hydrogen

Question 46

The compound NaBr is

Answer 46

ionic

Question 47

The compound barium fluoride is

Answer 47

ionic

Question 48

The compound sulfur difluoride is

Answer 48

molecular

Question 49

The compound CO is

Answer 49

molecular

Question 50

The compound Brass (Cu + Zn) is

Answer 50

metallic

Question 51

The compound Rose gold (Au + Cu) is

Answer 51

metallic

Question 52

What is the correct name for MgCl2?

Answer 52

Magnesium chloride

Question 52

What is the correct name for SBr2?

Answer 52

Sulfur dibromide

Question 53

What is the correct chemical formula for sodium fluoride?

Answer 53

NaF

Question 54

What is the correct name for LiBr?

Answer 54

Lithium bromide

Question 55

What is the correct chemical formula for nitrogen dioxide?

Answer 55

NO2

Question 56

How many bonds does sulfur need to make to get a full octet?

Answer 56

2

Question 57

How many bonds does Fluorine need to make to fill its octet?

Answer 57

1

Question 58

How many bonds does carbon need to make to fill its octet?

Answer 58

4

Question 59

What will be the central atom in the molecule NH3?

Answer 59

N

Question 60

What will be the central atom in the molecule H2O?

Answer 60

O

Question 61

Dipole-dipole

Answer 61

polar molecules stuck together

Question 62

hydrogen bonding

Answer 62

H is stuck to F, O, or N. very strong

Question 63

dispersion

Answer 63

wave nature of electrons, any molecule that have electrons has dispersion

Question 64

A material is very hard and melts at high temperatures, but will dissolve in water and will break along planes and with repeating angles when it breaks. What type of material is it most likely?

Answer 64

Ionic

Question 65

Gasoline (a mixture of compounds, but all with lots of C and H and all are nonpolar) evaporates much more quickly when spilled than water does. Why?

Answer 65

Gasoline has no hydrogen bonds or dipole-dipole interactions holding molecules together, while water has both

Question 66

Plastics are often flexible and melt at fairly low temperatures. What type of material are they?

Answer 66

Molecular

Question 67

Non polar molecules

Answer 67

are symmetric with no unshared electrons.

Question 68

Polar molecules

Answer 68

are asymmetric, either containing lone pairs of electrons on a central atom or having atoms with different electronegativities bonded

Question 69

According to the original version of atomic theory postulated by Dalton, atoms were ________

Answer 69

hard spheres

Question 70

Groups of elements that have similar properties are called _____

Answer 70

families

Question 71

Ceramics are stable at very high temperatures, but are prone to shattering. What type of material is a ceramic?

Answer 71

Ionic

Question 72

What is the origin of dispersion forces?

Answer 72

Random variations in electron distribution