Chemistry Final

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6

6

How many electrons are being shared by the atoms in the model below?

1. 2

2. 4

3. 6

4. 8

b

Which orbital diagram is done correctly?

1. a

2. b

3. c

electronegative

An atom that does not share electrons equally in a covalent bond and pulls the electrons to itself is described as

1. electronegative

2. endothermic

3. exothermic

4. electropositive

4 grams

Consider the following chemical reaction:        Hydrogen + Oxygen combine to form Water. If 36 grams of water are made and 32 grams of Oxygen are used, how many grams of Hydrogen are used?

1. 40 grams

2. 4 grams

3. 68 grams

4. 14 grams

Because they have a full set of valence electrons (and are stable)

Why do noble gases generally not form chemical bonds with other atoms?

1. Because they are nonmetals

2. Because they only form bonds with each other

3. Because they have a full set of valence electrons

4. Because they are unreactive

Sugar dissolves in water

Check the box that describes a physical change in matter

1. Sodium metal catches on fire when placed in water

2. Sugar dissolves in water

3. Hydrochloric acid reacts with potassium hydroxide to produces salt, water, and heat.

4. Silver jewelry tarnishes over time

Carbon

Which of the following elements can form 4 covalent bonds?

1. Hydrogen

2. Carbon

3. Nitrogen

4. Oxygen

138.539 grams

Using the information given below for Copper, calculate the mass of 2.18 moles of copper. Please choose the answer that you calculate exactly, do not round.

1. 138.53 grams

2. 138.539 grams

3. 63.22 grams

4. 138.53028 grams

atoms tend to gain, lose or share electrons in order to acquire a full set of 8 valence electrons.

The Octet Rule states that __________________

1. atoms are always found in groups of 8.

2. the Periodic Table has 8 groups.

3. all electron orbitals can fit exactly 8 electrons.

4. atoms tend to gain, lose or share electrons in order to acquire a full set of 8 valence electrons.

compound

H2O is a/an

1. heterogeneous mixture

2. homogeneous mixture

3. element

4. compound

14

How many Oxygen atoms are in the reactants below?

1. 6

2. 8

3. 14

4. 2

covalent

What type of bond will form between two oxygen atoms?

1. covalent

2. metallic

3. ionic

4. polar covalent

oxygen

Which of the following is an element:

1. water

2. air

3. oxygen

4. fire

p block

Groups 13-18, with the exception of He, make up the

1. d block

2. p block

3. s block

4. f block

GROUPS !!!!!!!!

What are the vertical columns on the periodic table called?

1. periods

2. groups

3. noble gases

4. Lanthanides and Actinides

63.546 g/mole

What is the molar mass of Cu (Copper)?

(picture of the periodic table included)

1. 35.4527 g/mole

2. 58.933200 g/mole

3. 29 g/mole

4. 63.546 g/mole

rust

Check the following that are chemical changes:

1. condense

2. crush

3. rust

4. melt

5. dissolve

10 moles

How many moles are there in 584.43 grams of NaCl? The molar masses of the elements are the following: Na=22.990 g/mole, Cl=35.453 g/mole

1. 20 moles

2. 10 moles

3. 10.000039354739526 moles

4. 5 moles

The 3D region around the nucleus where the electron is found 90% of the time

Which choice best defines an atomic orbital?

1. The circular path an electron takes around the nucleus of an atom

2. The 3D region around the nucleus where the electron is found 90% of the time

3. The principle energy level of the electron

4. Aufbau's rule describes atomic orbitals

All choices indicate a reaction has taken place

Which of the following indicates that a chemical reaction has taken place?

1. Gas bubbles are formed

2. Heat is produced

3. There is a color change

4. All choices indicate a reaction has taken place

salt dissolved in water

Check the following that are homogeneous mixtures:

1. vegetable soup

2. salt dissolved in water

3. a mixture of oil and water

4. Water

5. Copper metal

PERIODS !!!!!!

What are the horizontal rows on the periodic table called?

1. periods

2. noble gases

3. f block

4. groups

metals and nonmetals

What does the bright pink staircase line divide on the periodic table?

1. solids and gases

2. metals and nonmetals

3. electronegative and electropositive elements

4. d sublevel and p sublevel

196.97 amu

The average atomic mass of Gold, atomic number 79 is

1. 275.97 amu

2. not shown on the periodic table

3. 196.97 amu

4. 79 amu

a metal and a nonmetal

An ionic bond generally occurs between

1. a metal and a nonmetal

2. two metals

3. any two atoms

4. two nonmetals

neutrons, mass numbers

Isotopes of an element have different numbers of __________, which result in different ______________.

1. neutrons, atomic numbers

2. neutrons, protons

3. neutrons, mass numbers

4. protons, electrons

s block

Groups 1 and 2 and He make up the

1. p block

2. f block

3. s block

4. d block

b (1 covalent bond has 2 electrons shared, and it has 1 bond on each side total of 4 electrons/dots)

Which of the following molecules has two single covalent bonds?

1. a

2. b

3. c

4. d

5. e

6. f

Lanthanides

Elements 57-71 are called the

1. Noble gases

2. Lanthanides

3. Actinides

4. f block

Lewis Diagram

A diagram that shows the element symbol surrounded by dots representing valence electrons and lines that represent pairs of shared electrons is called a/an

1. Octet Rule

2. Lewis Diagram

3. Shell Diagram

4. Molecular Diagram

Zirconium

An atom has 40 electrons. Which element is it?

1. Calcium

2. Argon

3. Potassium

4. Zirconium

two nonmetals

A covalent bond generally occurs between

1. two nonmetals

2. two metals

3. any two atoms

4. a metal and a nonmetal

The Law of Conservation of Mass

The Law that states that the mass of the reactants in a chemical reaction are equal to the mass of the products in the reaction is

1. The Law of Multiple Proportions

2. The Law of Conservation of Mass

3. The Law of Conservation of Energy

4. The Law of Definite Proportions

become a vapor or gas

Adding heat to a liquid will eventually cause it to

1. become a solid

2. become a vapor or gas

3. dry up and disappear

4. catch on fire

a heterogeneous mixture

A sand and water mixture would be considered

1. a homogeneous mixture

2. a compound

3. a heterogeneous mixture

4. a pure substance

Sodium

The following is the electron configuration for

1. Hydrogen

2. Lithium

3. Sodium

4. Neon

6

How many electrons are shared between two atoms when there is a triple covalent bond?

1. 6

2. 4

3. 3

4. 2

3

How many sodium atoms are in the compound below?

1. 5

2. 3

3. 6

4. 21

2 X 14.007 + 6 X 1.0079

Choose the correct operation to find the molar mass of the product of this chemical reaction. The molar mass of N is 14.007 g/mole and the molar mass of H is 1.0079 g/mole.

1. 2 X 14.007 + 6 X 1.0079

2. 6 X 14.007 + 6 X 1.0079

3. 2 X 14.007 + 3 X 1.0079

4. 2 X 14.007 X 6 X 1.0079

Lithium

Calculate the atomic mass of element X. 7.5% of the isotopes have a mass of 6.015 amu and 92.5% of the isotopes have a mass of 7.016. Which element is X?

1. Carbon

2. Boron

3. Nitrogen

4. Lithium

principle energy level !!!!!!!!!!!!!!

What does the "1" stand for in this electron configuration?

1. electron

2. energy sublevel

3. orbital

4. principle energy level

cobalt

What element does this orbital diagram represent?

1. Zinc

2. Iron

3. Cobalt

4. Nickel

proton

The subatomic particle that gives an atom its identity is the

1. neutron

2. electron

3. proton

4. nucleus

the mass number of this isotope of Kr

What does the number 84 represent?

1. the mass number of this isotope of Kr

2. the number of neutrons of this isotope of Kr

3. the number of protons of this isotope of Kr

4. the number of electrons of this isotope of Kr

the mass in grams of one mole of a substance

Molar mass is ______________.

1. equal to 602 sextillion grams

2. the mass in grams of one mole of a substance

3. what gets extracted when you have your wisdom teeth removed

4. not found on the periodic table

5.2 moles CH4 divided by the molar mass of methane

Which one of the following mathematical operations answers the question "How many grams are there in 5.2 moles of methane gas?"

1. 5.2 moles CH4 divided by the molar mass of methane

2. The molar mass of CH4 divided by 5.2 moles

3. The molar mass of CH4 divided by Avogadro's number

4. 5.2 moles CH4 multiplied by the molar mass of methane

the particles are far apart and move rapidly

Choose the following that describes the behavior of the particles that make up a gas:

1. the particles are loosely connected to each other

2. the particles are far apart and move rapidly

3. The particles move farther apart if the temperature decreases

4. the particles are close together and vibrate

Mgl2 (for magnesium iodine, MgO for magnesium oxide) (in the question it says magnesium oxide, but in the pic and answer choices it says magnesium iodine? tell cavallo for an extra point maybe)

What is the formula of Magnesium oxide?

(all numbers are subscripts)

1. Mg2l

2. Mg2l2

3. Mgl2

4. Mgl

using a Periodic Table to look up the molar mass which is listed under the element name

You can find out how much a mole of sulfur weighs by

1. using a Periodic Table to look up the molar mass which is listed under the element name

2. asking your medical doctor

3. counting out all of the atoms and then weighing them on a scale

4. multiplying the molar mass of sulfur by Avogadro's number

bonds between atoms in reactants are broken, bonds between atoms in products are formed.

During a chemical reaction,

1. atoms are created.

2. atoms are destroyed.

3. bonds between atoms in reactants are broken, bonds between atoms in products are formed.

4. bonds between atoms in products are broken, bonds between atoms in reactants are formed.

Law of conservation of mass

Balanced chemical equations show that the _________ is being followed in a chemical reaction.

1. Law of conservation of mass

2. Law of definite proportions

3. Law of balanced equations

4. Law of cause and effect

2, 3, 2, 2

Balance the following equation. The correct coefficients  (in order) are:

1. 2, 3, 2, 2

2. 3, 3, 1, 1

3. 6, 6, 3, 1

endothermic (exo is negative, and since the difference is positive meaning the temperature increased after the reaction, it’s endo/positive)

The energy calculated to break bonds in the reactants of a chemical reaction is 2500 kJ. The energy released when bonds form in the products is 3000 kJ. This reaction is

1. endothermic

2. exothermic

3. combustion

4. nonspontaneous

valence electrons

The highest energy level, outermost electrons in an atom that are involved in chemical bonds are called ____________________ .

1. shell electrons

2. outside electrons

3. vital electrons

4. valence electrons

yields or produces

An arrow in an chemical equation can be read as

1. yields or produces

2. replaces

3. consumes

4. equals

1

How many orbitals does an s sublevel have?

1. 1

2. 3

3. 2

4. 5

3

How many orbitals does a p sublevel have?

1. 1

2. 3

3. 2

4. 5

5

How many orbitals does a d sublevel have?

1. 1

2. 3

3. 2

4. 5

7

How many orbitals does an f sublevel have?

1. 1

2. 3

3. 2

4. 5

5. 7

True

It is important that when you write an element symbol, the first letter is capitalized and the second letter is lowercase.

1. True

2. False

A diagram of the valence electrons in an atom.

What is an electron dot diagram?

1. A diagram of the core electrons in an atom.

2. A diagram of the protons in an element.

3. A diagram of the valence electrons in an atom.

4. A diagram of all electrons in an atom.

6.02 x 10^23

How many jelly beans are in a mole of jelly beans?

1. 602,000

2. a gazillion

3. 6.02 x 10^23

4. a few dozen

substances and mixtures

All matter can be divided into

1. homogeneous or heterogeneous mixtures

2. substances and mixtures

3. problems and solutions

4. elements and compounds

The Quantum Mechanical model

What is the current model of the atom called?

1. The Quantum Mechanical model

2. The Plumb-pudding model

3. The Bohr model

4. The Planetary model

compound

A pure substance made of two different elements bonded together is called a

1. homogeneous mixture

2. compound

3. product

4. heterogeneous mixture

covalent

A bond between two nonmetals that have a large difference in their electronegativity values would be best classified as

1. polar covalent

2. ionic

3. covalent

4. nonpolar covalent

ion

An atom that loses or gains electrons and has a charge is called a/an____________.

1. compound

2. isotope

3. mixture

4. ion

waves

The quantum mechanical model of the atom takes into account that electrons behave as both particles and

1. waves

2. gamma rays

3. neutrons

4. protons

reactants

In a chemical equation, the elements and compounds to the left of the arrow are called the

1. reactants

2. products

3. coefficients

4. yields

Nitrogen

The atoms below could be

1. Hydrogen

2. Carbon

3. Fluorine

4. Nitrogen

6

An atom has a mass number of 14 and an atomic number of 6. How many electrons does it have?

1. 8

2. 6

3. 20

4. 14

a metal and an nonmetal ion

An ionic bond forms between

1. two metal ions

2. two nonmetal ions

3. a metal and an nonmetal ion

4. any two ions

pic is the answer

Which is the correct dot diagram for the element carbon?

Carbon-14

The proper way to indicate the isotope of carbon (atomic number 6) that has 8 neutrons is:

1. Carbon-6

2. Carbon-16

3. Carbon-12

4. Carbon-14

noble gases

What are the elements in the last group (8A or 18) on the periodic table called?

1. actinides

2. noble gases

3. p block

4. lanthanides

48

How many neutrons does this isotope of Kr have?

1. 84

2. 36

3. 120

4. 48

cation

An atom that loses electrons becomes a(n)...

1. anion

2. cation

3. positron

4. Higgs Boson

First, look up the molar mass of a hydrogen atom, then multiply it times 2. Then look up the molar mass of an oxygen atom and add it to the number you got in the first step.

How would you figure out the molar mass of a water molecule?

1. First, look up the molar mass of a hydrogen atom, then multiply it times 2. Then look up the molar mass of an oxygen atom and add it to the number you got in the first step.

2. First, look up "water" on the Periodic Table, then add Avogadro's Number to it.

3. First, add the number of hydrogen molecules to the number of oxygen molecules. Then make sure you have a balanced equation.

4. Divide the number of moles by the number of particles in one mole.

Liquid

Which state of matter has a definite volume, but no definite shape?

1. Gas

2. Plasma

3. Solid

4. Liquid

ionic

What type of bond will form between Lithium (Li) and Chlorine (Cl)?

1. metallic

2. polar covalent

3. ionic

4. covalent

False

The period in which an element occurs, will tell you how many valence electrons an atom has.

1. True

2. False

physical

Chlorine gas is yellowish in color. This is an example of a __________ property of chlorine.

1. physical

2. heterogeneous

3. homogeneous

4. chemical

molecule

A group of two or more nonmetal atoms joined by covalent bonds is called a

1. compound

2. formula unit

3. molecule

4. chemical

6

How many total Hydrogen atoms are there in the product of the balanced chemical equation?

1. 2

2. 3

3. 6

4. 4

endothermic (absorbs heat, so it feels cold; exothermic releases heat, so it feels hot/warm)

Which type of chemical reaction will feel cold to the touch?

1. exothermic

2. covalent

3. ionic

4. endothermic

both the mass and abundance of the atom's isotopes

The average atomic mass of an atom is usually not a whole number because it takes into account

1. the mass of each of the atom's isotopes

2. the abundance of the atom's isotopes in nature

3. both the mass and abundance of the atom's isotopes

4. the mass of the protons and electrons of the atom

nucleus of the atom

Earnest Rutherford used the gold foil experiment to discover the

1. Plumb pudding model of the atom

2. Quantum mechanical model of the atom

3. nucleus of the atom

4. Planetary model of the atom

protons and electrons

An atom is neutral because it has the same number of ___________ and ____________.

1. protons, neutrons and electrons

2. neutrons and electrons

3. protons and electrons

4. protons and neutrons

a homogeneous mixture

In chemistry, a solution is

1. a mixture of two metals

2. a pure substance

3. a heterogeneous mixture

4. a homogeneous mixture

electron

The part of the atom that is important in creating bonds with other atoms is the

1. proton

2. electron

3. neutron

4. nucleus

synthesis

The following equation is a _______________ reaction

1. decomposition

2. combustion

3. synthesis

4. double replacement

5. single replacement

6 electrons

How many electrons will a p sublevel hold?

1. 6 electrons

2. 3 electrons

3. 2 electrons

4. 10 electrons

Chromium

The mass number of an atom is 52 and the atomic number is 24. Which element is this?

1. Osmium

2. Nickel

3. Tellurium

4. Chromium

3

The molar mass of carbon is 12.011 g. How many moles do you have if you have 36.033 g of carbon? Please select the answer closest to what appears in your calculator, do not round.

1. 602 sextillion moles

2. 3.000074933184564 moles

3. 432.792363 moles

4. 3 moles

Potassium transferred it's one valence electron to Chlorine, ions formed and an ionic bond resulted.

The top diagram shows you a neutral potassium atom and a neutral chlorine atom. What does the bottom diagram indicate?

1. Potassium transferred all 8 of its electrons to chlorine.

2. Potassium gained an electron while chlorine lost an electron.

3. Potassium forms an anion and chlorine forms a cation to form an ionic bond.

4. Potassium transferred it's one valence electron to Chlorine, ions formed and an ionic bond resulted.

electronegativity value

The values on the periodic table below represent the element's

1. atmic number

2. ionization energy value

3. electronegativity value

4. atomic mass

coefficients, subscripts

When balancing equations, you can add _________ but you can never add or change _________.

1. atoms, compounds

2. superscripts, subscripts

3. subscripts, coefficients

4. coefficients, subscripts

4

Carbon has _____________ valence electrons.

1. 4

2. 0

3. 14

4. 6