Mid Term Exam - 2017

Question 1

Be able to look at a diagram and know which is a mixture?

Answer 1

Use your study guide

Question 2

What is an identifying characteristic of a mixture?

Answer 2

A mixture can be separated by physical means

Question 3

By what means do you separated iron filings and salt?

Answer 3

Solubility

Question 4

What is a true solution?

Answer 4

Homogeneous

Question 5

Be able to know what a filtration system looks like

Answer 5

Use your study guide

Question 6

Be able to know what a distillation system looks like

Answer 6

Use your study guide

Question 7

Is concentrated hydrochloric acid is diluted with water a chemical or physical change?

Answer 7

Physical change

Question 8

What substance can decompose by a chemical change?

Answer 8

water

Question 9

Is air an example of an element or mixture?

Answer 9

Mixture

Question 10

Be able to look at a diagram and determine if it is mixture of compounds?

Answer 10

Use your notes

Question 11

Be able to look at a diagram and determine if it is a mixture of elements.

Answer 11

Use your notes

Question 12

What is the process that is used to separate a mixture of elements?

Answer 12

Distillation

Question 13

Be able to look at a diagram and determine if it is an example of heterogeneous mixture of elements and compounds

Answer 13

Use your notes

Question 14

How would you describe a chemical property of the element iodine?

Answer 14

It reacts with hydrogen to form a gas

Question 15

Is burning a chemical or physical change?

Answer 15

Chemical Change

Question 16

What happens to the product with the lower boiling point when distillation is performed?

Answer 16

It condenses in a receiving flask

Question 17

Who is the greek philosopher that was the first person to propose the idea that matter is made of tiny individual particles called atoms?

Answer 17

Democritus

Question 18

What is Dalton’s atomic theory?

Answer 18

Different atoms combine in simple whole number ratios to form compounds

Question 19

What discovery was due to the development of the cathode ray tube?

Answer 19

electrons

Question 20

What did experimental evidence indicate about the nucleus of an atom?

Answer 20

It contains most of the mass of the atom

Question 21

What conclusion was made with regard to the experiment about alpha particles being used to bombard gold foil?

Answer 21

Nucleus of an atom is smaller that the atom and positively charged

Question 22

What did scientist concluded about atoms after bombarding a gold foil sheet with alpha particles?

Answer 22

Atoms consist mainly of empty space

Question 23

What is the location in an atom called that is a region of most probable electron?

Answer 23

An orbital

Question 24

What particle has the least mass?

Answer 24

An electron

Question 25

Describe an electron

Answer 25

A smaller mass than a proton and negatively charged

Question 26

What particle has a mass of approximately one atomic mass unit and a unit positive charge?

Answer 26

proton

Question 27

What particle has about the same mass as a proton?

Answer 27

neutron

Question 28

What two particles have most of the mass in the atom?

Answer 28

protons and neutrons

Question 29

What is the definition of the atomic mass of an element?

Answer 29

The weighted average mass of that element's naturally occurring isotopes

Question 30

What principal energy level of an atom contains an electron with the lowest energy?

Answer 30

n = 1

Question 31

Be able to write the electron configuration of elements

Answer 31

Use your notes

Question 32

How many orbitals are in the s sublevel of an atom?

Answer 32

1

Question 33

How many orbitals are in the 4f sublevel?

Answer 33

7

Question 34

What sublevel contains the greatest number of orbitals?

Answer 34

f

Question 35

What principal energy level has no f sublevel?

Answer 35

3

Question 36

Be able to determine the number of COMPLETELY filled orbitals when you look at the electron configuration of an atom.

Answer 36

Use your notes

Question 37

What is the maximum number of electrons that a single orbital of the 3d sublevel can contain?

Answer 37

2

Question 38

What sublevel has a total of 5 orbitals?

Answer 38

d

Question 39

What is the total number of orbitals in a d sublevel?

Answer 39

5

Question 40

What MUST samples of elements that are radioactive contain?

Answer 40

Atoms with unstable nuclei

Question 41

Why is carbon-13 less stable than carbon-12??

Answer 41

Carbon -13 has more neutrons

Question 42

What particle has the greatest mass?

Answer 42

An alpha particle

Question 43

In an electric field - what emanation is deflected toward the negative electrode?

Answer 43

Alpha particle

Question 44

When an alpha particle is emitted by an atom the atomic number of the atom will . . . ?

Answer 44

Decrease by 2

Question 45

What does the structure of an alpha particle look like?

Answer 45

Helium nucleus

Question 46

What type of radiation is most similar to high-energy X-ray?

Answer 46

Gamma

Question 47

What emission from a radioactive source is not affected by an electric field?

Answer 47

Gamma rays

Question 48

Describe a gamma ray

Answer 48

No electric charge and no mass

Question 49

How are all the elements arranged on the modern Periodic table?

Answer 49

Atomic number

Question 50

Who was credited with creating the first periodic table that organized the elements according to atomic mass?

Answer 50

Dmitri Mendeleev

Question 51

Compare a neon atom to a helium atom?

Answer 51

Neon has a smaller radius

Question 52

Be able to determine which element has the largest atomic radius

Answer 52

Use your notes

Question 53

Be able to determine which elements are arranged in decreasing atomic radii

Answer 53

Use your notes

Question 54

Compare the atoms of metals to the atoms of nonmetals

Answer 54

Nonmetals have a higher electronegativities and lower ionization energies

Question 55

Be able to determine electronegativity of elements

Answer 55

Use your notes

Question 56

What type of bond is formed by the transfer of electrons from one atom to another?

Answer 56

And ion bond

Question 57

When ionic bonds are formed - what do metallic atoms tend to do?

Answer 57

Lose electrons and become positive ions

Question 58

When metal atoms bond with nonmetal atoms - - what will the nonmetal atoms do?

Answer 58

Gain electrons and the resulting ions are larger

Question 59

What type of bonds are formed when calcium atoms react with oxygen atoms?

Answer 59

Ionic bonds

Question 60

What will happen when a potassium atom reacts with bromine - what will happen with the potassium atom?

Answer 60

Will lose only 1 electron

Question 61

Be able to recognize an ionic compound

Answer 61

Use your notes

Question 62

Be able to recognize an ionic bond

Answer 62

Use your notes

Question 63

What type of bonding is characteristic of a substance that has a high melting point and electrical conductivity only in the liquid phase?

Answer 63

ionic bonding

Question 64

Which compound in the solid state has a high melting point and conducts electricity when it is liquefied?

Answer 64

potassium chloride

Question 65

What is the electronegativity value of an element?

Answer 65

A measure of the atoms ability to attract electrons