Chem I Midterm Review

Question 1

A mass of 5.0 g takes up a 3.5 cm3 volume, what is the density? (1 cm3 = 1 ml)

Accepted Answer

1.4 g/ml

Question 2

Lithium and oxygen form an ionic bond. The correct formula is

Accepted Answer

Li2O

Question 3

An atom from group 3 on the periodic table forms what ion net charge?

Accepted Answer

3+

Question 4

Metal substances are good conductors of electricity because they

Accepted Answer

contain mobile valence electrons.

Question 5

How to separate substances with different boiling points?

Accepted Answer

Distillation

Question 6

The following subatomic particle(s) play(s) the most important role in nuclear reactions.

Accepted Answer

Protons and neutrons

Question 7

Rutherford’s gold foil experiment proved that atoms contain a positively charged

Accepted Answer

nucleus.

Question 8

MgCl2 and Na2S are both

Accepted Answer

ionic compounds.

Question 9

The difference between a compound and a mixture?

Accepted Answer

Mixtures separate physically, compounds separate chemically

Question 10

Which element is not a metal?

Accepted Answer

selenium (Se)

Question 11

How are the elements in each group of the periodic table related?

Accepted Answer

They have the same number of valence electrons.

Question 12

Which group of elements tend to form cations by giving up one or more electrons?

Accepted Answer

Metals

Question 13

The electronegativity periodic trend increases

Accepted Answer

right across a period, up a group.

Question 14

A swimming pool was measured at 2.05 m. The accepted values is 2.00 m. Find the percent error?

Accepted Answer

2.5%

Question 15

Arrange the following covalent compounds in order of increasing polarity.

Accepted Answer

H-H , S-Cl , O-H , H-F

Question 16

How do particles in a solid move?

Accepted Answer

Particles vibrate in place

Question 17

For the following ionic formula, identify the group number to which the element X belongs. CaX

Accepted Answer

Group 6

Question 18

Convert 2580 milliliters to liters.

Accepted Answer

2.580 L

Question 19

Convert 0.012 kg to grams (g).

Accepted Answer

12 g

Question 20

Elements with 1 valence electron have low 1st ionization energy. Why does the 2nd IE increase?

Accepted Answer

Removing the 2nd e- is harder.

Question 21

Iodine (I) has a mass number of 127, how many neutrons does it have?

Accepted Answer

74

Question 22

In which group on the periodic table are the halogens found?

Accepted Answer

7

Question 23

An electron can exist in between 2 quantum states.

Accepted Answer

No

Question 24

Which of the following is a heterogeneous mixture?

Accepted Answer

Oil and vinegar

Question 25

Accuracy is how close a series of measurements are to

Accepted Answer

a true value

Question 26

Precision is how close a series of measurements are to

Accepted Answer

to each other

Question 27

The alkali metals group is located where on the periodic table?

Accepted Answer

Group 1 on the periodic table

Question 28

What is the maximum number of electrons a single orbital can hold? (Pauli exclusion principle)

Accepted Answer

2

Question 29

Generally, ionic compounds have __________ melting points compared to covalent compounds.

Accepted Answer

higher

Question 30

Arrange the elements in order of increasing atomic size (smallest < biggest).

Accepted Answer

F < N < Al < K < Cs

Question 31

Which group of elements on the periodic table lose 2 electrons when they become ions?

Accepted Answer

2

Question 32

What is the maximum number of valence electrons an element can hold?

Accepted Answer

8

Question 33

Which element would have the lowest electronegativity value?

Accepted Answer

Lithium

Question 34

Arrange the elements in order of increasing electronegativity.

Accepted Answer

Cs < K < Al < N < F

Question 35

In what direction do 2 electrons occupying the same orbital need to spin?

Accepted Answer

Opposite

Question 36

Which of the following is the correct ratio of magnesium to bromine atoms in magnesium bromide?

Accepted Answer

MgBr2

Question 37

Which element, when combined with fluorine, would most likely form an ionic compound?

Accepted Answer

Potassium

Question 38

Ionic compounds are __ conductors of electricity in solution than covalent compounds.

Accepted Answer

better

Question 39

Which state of matter has particles that are relatively far apart and free to move?

Accepted Answer

Gas

Question 40

Which element is a halogen?

Accepted Answer

bromine (Br)

Question 41

Why does wood feel warm to the touch and metal feels cold at room temperature?

Accepted Answer

metal is a good conductor of heat.

Question 42

The following subatomic particle plays the most important role in chemical reactions.

Accepted Answer

Electrons

Question 43

What do the dots represent when drawing electron dot structures?

Accepted Answer

Valence electrons (outermost high energy electrons)

Question 44

Which group of elements on the periodic table gain 1 electron when they become ions

Accepted Answer

7

Question 45

What must occur for a change to be a chemical reaction?

Accepted Answer

There must be a change in chemical composition.

Question 46

When excited e- fall back down to their ground state they release energy in the form of

Accepted Answer

electromagnetism.

Question 47

The nucleus of an atom

Accepted Answer

contains essentially all of the atom’s mass

Question 48

Which of the following are transferred or shared when two atoms react chemically?

Accepted Answer

Electrons

Chem I Midterm Review

Questions 48

Chem I Midterm Review

Questions 48