Quiz about Chemistry Midterm Review Questions

Question 1

Use the conversion factor 10 mm = 1 cm to convert 4.00 x 10³ mm to cm.

Accepted Answer

4.00 x 10³ mm x $$\frac{1 ext{ cm}}{10 ext{ mm}}$$ =

4.00 x 10² cm

Answer

4.00 x 10³ mm x $$\frac{1 ext{ cm}}{10 ext{ mm}}$$ =

2.65 cm

Answer

4.00 x 10³ mm x $$\frac{10 ext{ mm}}{1 ext{ cm}}$$ =

4.00 x 10⁴ cm

Question 2

Use the conversion factor 1 kL = 1,000 L to convert 0.5 kL to L.

Accepted Answer

0.5 kL x $$\frac{1,000 ext{ L}}{1 ext{ kL}}$$ = 500 L

Answer

0.5 kL x $$\frac{1 ext{ kL}}{1,000 ext{ L}}$$ = 0.0005 kL

Answer

0.5 kL x $$\frac{1 ext{ kL}}{1,000 ext{ L}}$$ = 0.005 kL

Question 3

Use the % error formula on the back of the periodic table. The mass of a sample is 50 g. A balance measures the mass of this sample as 40 g. What is the percent error of the balance?

Accepted Answer

20%

Answer

2%

Answer

-20%

Question 4

2 Be(OH)₂

What's the coefficient?

Accepted Answer

2

Answer

1

Answer

0

Question 5

2 Be(OH)₂

How many Be atoms are present?

Accepted Answer

2

Answer

1

Answer

0

Question 6

2 Be(OH)₂

How many oxygen atoms are present?

Accepted Answer

2

Answer

1

Answer

3

Question 7

2 Be(OH)₂

How many hydrogen atoms are present?

Accepted Answer

4

Answer

2

Answer

6

Question 8

3 Fe(NO₃)₃

How many oxygen atoms are present?

Accepted Answer

27

Answer

3

Answer

9

Question 9

When a substance melts, its shape changes but what it's composed of does not change. How do chemists describe this change?

Accepted Answer

physical change

Answer

chemical change

Question 10

Choose the correct statement.

Accepted Answer

Crushing a rock is an irreversible physical change.

Answer

Boiling water is a chemical change.

Question 11

Why is rusting a chemical change?

Accepted Answer

It creates a new substance.

Answer

It is reversible.

Answer

It doesn't change the composition of the substance.

Question 12

What signs indicate that a chemical change is occurring?

Accepted Answer

Gas bubbles

Answer

Dissolving

Answer

Melting

Question 13

If two liquid solutions are mixed together and a solid formed, what do chemists call the solid?

Accepted Answer

precipitate

Answer

magic

Answer

production of a gas

Question 14

Which statement is true?

Accepted Answer

Electrons are negatively charged particles.

Answer

Neutrons are negatively charged particles.

Answer

Protons are negatively charged particles.

Answer

Electrons are in the nucleus of atoms.

Question 15

How many C atoms are in the reactants?

Accepted Answer

1

Answer

2

Answer

3

Answer

4

Question 16

How many O atoms are in the products?

Accepted Answer

4

Answer

1

Answer

2

Answer

3

Question 17

How many molecules of water are produced?

Accepted Answer

2

Answer

1

Answer

3

Answer

4

Question 18

If a reaction starts with 10 grams of reactants, how many grams of product will be produced?

Accepted Answer

10

Answer

5

Answer

20

Question 19

Choose the chemical symbol that is incorrect.

Accepted Answer

NE

Answer

O

Answer

Mg

Answer

Mn

Question 20

What does this represent?

Accepted Answer

Element

Answer

Compound

Answer

Mixture

Question 21

What does this represent?

Accepted Answer

Compound

Answer

Element

Answer

Mixture

Question 22

What does this represent?

Accepted Answer

Mixture

Answer

Element

Answer

Compound

Question 23

What is the subscript for hydrogen in H₂O?

Accepted Answer

2

Answer

1

Answer

3

Question 24

Choose the description of electrons in the lowest energy state.

Accepted Answer

Ground state

Answer

Excited state

Answer

Orbital

Answer

Bohr model

Question 25

What happens when an electron gains energy?

Accepted Answer

Jumps aways from the nucleus to an outer shell, becoming excited

Answer

Falls from an outer shell towards the nucleus, becoming grounded

Question 26

What happens when an electron loses energy?

Accepted Answer

Falls from an outer shell towards the nucleus, becoming grounded

Answer

Jumps aways from the nucleus to an outer shell, becoming excited

Question 27

In order to move from the ground state to an excited state, an electron must

Accepted Answer

gain energy.

Answer

release energy.

Question 28

Electrons are found in specific orbits around the nucleus

Accepted Answer

True

Answer

False

Question 29

Electrons can be located between orbits

Accepted Answer

False

Answer

True

Question 30

When energy is added, electrons move to lower-energy orbits

Accepted Answer

False

Answer

True

Question 31

Orbits are assigned principle energy levels, like 2p

Accepted Answer

True

Answer

False

Question 32

When is light emitted (given off)?

Accepted Answer

When electrons fall from an excited state back to their ground state

Answer

When electrons jump from ground to excited state

Question 33

What does the cloud represent in the electron cloud model of atoms?

Accepted Answer

The probability of the electron location.

Answer

The average distance between the electron and the nucleus.

Answer

The minimum distance between the electron and the nucleus.

Question 34

The image shown is a bright line spectra, showing the wavelengths of electrons in various elements. What is the unidentified element?

Accepted Answer

Element L

Answer

Element M

Answer

Element X

Answer

Element Z

Question 35

What subatomic particle causes the lines seen in emission spectra diagrams?

Accepted Answer

Electrons

Answer

Protons

Answer

Neutrons

Answer

Quarks

Question 36

What is the net charge on any ionic compound?

Accepted Answer

0

Answer

3-

Answer

3+

Answer

1.5

Question 37

What does the formula for sodium phosphate look like?

Accepted Answer

Na3PO4

Answer

NaPO4

Answer

Na3P

Question 38

What is the correct formula for lead(IV) phosphide?

Accepted Answer

Pb3P4

Answer

PbP

Answer

P4Pb3

Question 39

How many electrons in total are transferred from calcium atoms to nitrogen atoms to make the ionic compound calcium nitride, Ca₃N₂?

Accepted Answer

6

Answer

2

Answer

4

Answer

8

Question 40

Ionic compounds consist of

Accepted Answer

Cations (+) and anions (-)

Answer

Cations (+) and cations (+)

Answer

Antions (-) and anions (-)

Question 41

What is the term for the small numbers to the lower right of symbols in chemical formulas?

Accepted Answer

subscript

Answer

superscript

Question 42

What is the term for electrons in the outermost energy level?

Accepted Answer

valence electron

Answer

outer electron

Answer

anion

Answer

vernal electron

Question 43

In the ionic compound cobalt(III) phosphite, how many cobalt(III) ions are needed to form an ionic compound with phosphite?

Accepted Answer

1

Answer

2

Answer

3

Answer

0

Question 44

When group 3A elements become charged ions they will

Accepted Answer

lose electrons

Answer

lose protons

Answer

lose neutrons

Question 45

When magnesium becomes an ion, what will its charge and subsequent electron configuration be?

Accepted Answer

+2, 2p6

Answer

+2, 2s2

Answer

-2, 2p6

Question 46

Choose the correct statement about single covalent bonds.

Accepted Answer

Two atoms share two electrons.

Answer

One atom completely loses two electrons to the other atom in the bond.

Answer

Two atoms share two pairs (4 total) of electrons.

Answer

Two atoms share one electron.

Question 47

What is the purpose of sharing electrons in covalent bonds?

Accepted Answer

to attain a noble-gas electron configuration for stability

Answer

to become ions and attract each other

Answer

to become more polar

Answer

to increase their atomic numbers

Question 48

Carbon tetrachloride is a(n)

Accepted Answer

binary compound.

Answer

monatomic ion.

Answer

polyatomic ion.

Answer

polyatomic compound.

Question 49

Covalent molecular compounds are made of

Accepted Answer

two or more nonmetallic elements.

Answer

two or more transition elements.

Answer

positive and negative ions.

Question 50

What is the ending for the names of all binary compounds?

Accepted Answer

-ide

Answer

-ite

Answer

-ade

Answer

-ate

Question 51

Choose the binary covalent molecular compound.

Accepted Answer

CO2

Answer

NaOH

Answer

HgO

Question 52

Which of the following is the correct name for C₂O₄?

Accepted Answer

dicarbon tetraoxide

Answer

carbon oxide

Answer

carbon tetraoxide

Question 53

Classify NaOH.

Accepted Answer

Polyatomic ionic compound

Answer

Polyatomic covalent compound

Answer

Binary molecular compound

Question 54

Why do elements form chemical bonds?

Accepted Answer

all answers are correct

Answer

to obtain lower energy states

Answer

to mimic the noble gases

Answer

to become more stable

Question 55

How do ionic bonds differ from covalent bonds?

Accepted Answer

Ionic bonds transfer electrons between atoms.

Answer

Ionic bonds share electrons between atoms.

Answer

Ionic bonds only contain metals.

Answer

Ionic bonds only contain nonmetals.

Question 56

Choose the correct statement.

Accepted Answer

Cobalt's atomic number is 27, so it has 27 protons.

Answer

Cobalt's mass number is 27, so it has 27 electrons.

Answer

Cobalt's atomic number is 27, so it has 27 neutrons.

Question 57

Choose the correct statement.

Accepted Answer

Potassium has 19 protons and 19 electrons in a neutral atom.

Answer

Potassium has 19 protons and 19 neutrons in a neutral atom.

Answer

Potassium has 19 neutrons and 19 electrons in a neutral atom.

Chemistry Midterm Review Questions

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