Which statement describes an atom of oxygen?

Nitrogen-15 is an isotope of oxygen.

Most naturally occurring atoms of oxygen contain 9 neutrons.

All atoms of oxygen include 8 protons.

Its atomic weight is the same as its atomic mass.

can form up to 4 bonds with other atoms.

has no vacancies in its outermost shell.

can’t form bonds with other atoms of carbon.

can hold 4 electrons in its first electron shell.

is the least reactive of all elements.

Which statement describes how the electron shells of sodium (Na)-11 electrons-are filled?

2 electrons in the first shell, 8 electrons in the second shell, and 1 electron in the third shell

2 electrons in the first shell and 9 electrons in the second shell

4 electrons in the first shell, 4 electrons in the second shell, and 3 electrons in the third shell

11 electrons in the first shell

8 electrons in the first shell and 3 electrons in the second shell

Under which condition are atoms most stable and least likely to bond with other atoms?

when their outermost electron shell is filled to capacity

when their outermost electron shell has four or more vacancies

when they have the same number of protons as electrons

when they have a positive charge

when they have a negative charge

Which statement is true about atoms that are more stable?

They tend not to react or combine with other atoms.

They are more likely to interact with other atoms.

They tend to have several electron vacancies in their outermost shell.

They have a small number of protons.

They have fewer electrons than atoms that are less stable.

Choose the best description of a covalent bond from the choices below.

A nitrogen atom shares electrons with three hydrogen atoms

Two water molecules interact due to partial charges on the oxygen and hydrogen atoms.

A magnesium donates electrons and forms bonds with two chloride ions.

A bond forms between a hydrogen from one molecule and a nitrogen from another molecule.

A positive potassium ion forms a bond with a negative chloride ion.

A lithium atom contains 3 electrons, whereas a fluorine atom contains 9 electrons. Which correctly describes the formation of a bond between lithium and fluorine atoms?

Lithium will donate an electron to fluorine, making a positive lithium ion and a negative fluoride ion that are attracted to each other.

Lithium and fluorine will share one pair of electrons.

A hydrogen bond will form between the partially positive lithium and the partially negative fluorine.

Lithium will take an electron from fluorine, making a negative lithium ion and a positive fluoride ion that are attracted to each other.

Lithium and fluorine share two pairs of electrons.

A covalent bond is formed when:

one atom gives up electrons to another atom.

two nonpolar molecules associate with each other in a polar environment.

two polar molecules associate with each other in a nonpolar environment.

a positively charged particle is attracted to a negatively charged particle.

the interaction between a hydrogen atom covalently bonded to an electronegative atom and another electronegative atom.

the sharing of electrons between a hydrogen atom and another atom.

the electrostatic interaction between an atom that has lost an electron and an atom that has gained an electron.

How is the reaction 2H2+ O2→2H2O described in words?

Two molecules of hydrogen combine with one molecule of oxygen to form two molecules of water.

Two molecules of hydrogen combine with two atoms of oxygen to form two molecules of water.

Two molecules of hydrogen combine with two molecules of oxygen to form two molecules of water.

Two atoms of hydrogen combine with one atom of oxygen to form two atoms of water.

Two atoms of hydrogen combine with two atoms of oxygen to form two molecules of water.

Three principal types of bonds hold multiple atoms together. These are:

covalent bonds, ionic bonds, and hydrogen bonds.

phosphate bonds, disulfide bonds, and hydrogen bonds.

hydrogen bonds, ionic bonds, and glycosidic linkages.

covalent bonds, ionic bonds, and disulfide bonds.

ionic bonds, hydrogen bonds, and ester bonds

One important difference between covalent and ionic bonds is that:

in covalent bonds, two atoms share electrons, whereas in ionic bonds, one atom gives one or more electrons to the other atom.

ionic bonds are much stronger than covalent bonds.

in ionic bonds, two atoms share electrons, whereas in covalent bonds, one atom gives one or more electrons to the other atom.

in ionic bonds, both protons and electrons can be shared, whereas in covalent bonds, only electrons can be shared.

ionic bonds only occur among water-soluble elements

When two hydrogen atoms share electrons, what is the result?

A stable H2 molecule is formed.

The nuclei repel each other and destabilize the molecule.

AnH2 molecule is formed, which is highly likely to bond with other atoms.

One of the hydrogen atoms is stable, whereas the other remains unstable.

A positively charged H2 molecule is formed

Why is a molecule of H2 more stable than an atom of hydrogen?

The H2 molecule shares the 2 electrons in the outermost shell.

The H2 molecule has 4 electrons instead of 2.

The H2 molecule has a vacancy in the outermost electron shell.

Two pairs of electrons are shared in a strong double bond.

The innermost shell is more stable when it has 1 electron in it

Identify the statement that correctly describes hydrogen bonds.

attraction between a slightly positive atom of one molecule and a slightly negative atom of another molecule

a bond between two hydrogen atoms to form H2

attractions between hydrogen and oxygen to form a water molecule

attractions between oppositely charged ions

The tendency of molecules to stick together, called cohesion, is stronger in water than other liquids because the polarity of water allows a(n):

hydrogen atom from one water molecule to form a hydrogen bond with the oxygen atom of another water molecule.

hydrogen atom from one water molecule to form an ionic bond with the oxygen atom of another water molecule.

hydrogen atom from one water molecule to form a hydrogen bond with the hydrogen atom of another water molecule.

hydrogen atom from one water molecule to form a covalent bond with the oxygen atom of another water molecule

oxygen atom from one water molecule to form a hydrogen bond with the oxygen atom of another water molecule.

The fact that water is less dense as a solid than as a liquid explains why:

ice floats on top of liquid water.

water can resist temperature changes.

ice cubes sink when placed in a glass of water.

Most substances become denser when frozen, but water becomes less dense. As a consequence, ice floats. What is responsible for this unusual property?

As the temperature drops and water molecules slow down, there is increasing opportunity for the hydrogen bonds to form. These bonds hold the numerous V-shaped molecules slightly farther apart than when no hydrogen bonds exist, causing the water to be less dense.

Oxygen is able to covalently bond with additional hydrogen molecules when the temperature drops and molecular motion slows down. Because hydrogen floats, the greater the number of hydrogen atoms bound to an oxygen molecule, the more buoyant it becomes.

Because covalent bonds are broken by the process of freezing, ice molecules have fewer electrons than water,and so they are less dense and float.

Most water molecules have some sodium and chloride ions bound to them. Upon freezing, the sodium and chloride ions are lost, making the ice less dense.

Molecular motion is slower in solid substances than liquids; therefore, more of the molecules can evaporate. As a consequence, when water freezes, it stays in close contact with air.

Why do coastal areas have milder, less variable climates than inland areas?

Large bodies of water, especially oceans, can absorb huge amounts of heat from the sun during warm times of the year, reducing temperature increases on the land. Similarly, during cold times of year the ocean slowly cools, giving off heat that reduces the temperature drop on shore.

Large bodies of water have high salt concentrations, and salt absorbs a large proportion of the light energy that would have warmed the land.

Coastal areas are concentrated near the equator, which varies less than other parts of the globe in the angle at which the sun’s light hits it.

Because water is a good solvent, it is able to dis solve the photons in light, reducing their ability to heat or cool the land.

There is no known reason why coastal areas have milder, less variable climates than inland areas.

Which of these is not the result of hydro gen bonding between water molecules?

ability to dissolve polar substances

A substance similar to table salt, called magnesium chloride, separates into positively charged magnesium ions and negatively charged chloride ions when placed in water. If you were to look at the magnesium ions dissolved in the water, what would you see?

The magnesium ions would be surrounded by water molecules with their oxygen atoms facing the magnesium ions.

The magnesium ions would be surrounded by chloride ions.

The magnesium ions would be surrounded by water molecules with their hydrogen atoms facing the magnesium ions.

The magnesium ions would be drifting by themselves, without any water molecules nearby.

The magnesium ions would be covalently bonded to water molecules.

Which statement is true about acids and bases?

Acids mixed with bases neutralize each other.

Acids and bases do not react with each other.

Acids mixed with bases make stronger acids.

Acids mixed with bases make stronger bases.

What would you expect to happen to the pH of an unbuffered solution if a few drops of acid were added?

The pH would increase and then rapidly decrease

Which of these is a correct statement about pH?

As the concentration of H+ increases in a solution, the pH decreases.

The pH of a solution increases as its acidity increases.

The pH of a basic or alkaline solution is less than that of an acidic solution.

A solution to which HCl has been added will have a greater pH than a solution to which NaOH has been added.

Each number on the pH scale represents an increase of 108

Ch 2

Quiz

•

Biology, Chemistry

•

University

•

Practice Problem

•

Medium

Christina Cruz

Used 24+ times

FREE Resource

Student preview

True or False: A piece of silver can be cut indefinitely into pieces and still retain all of the properties of silver.

True. All particles, including subatomic particles that make up the element, possess the properties of the element.

True. Atoms are the smallest units of matter, are indivisible, and possess the properties of their element.

False. Once the pieces are smaller than an atom of silver, the pieces no longer retain the properties of silver.

False. Silver atoms are too small to possess the properties of silver.

False. As a piece of silver is cut into smaller pieces, the atoms begin to take on the properties of smaller

elements.

Access all questions and much more by creating a free account

Create resources

Host any resource

Get auto-graded reports

Continue with Google

Continue with Email

Continue with Classlink

Continue with Clever

or continue with

Microsoft

Apple

Others

Already have an account?

Popular Resources on Wayground

15 questions

Fractions on a Number Line

Quiz

•

3rd Grade

20 questions

Equivalent Fractions

Quiz

•

3rd Grade

25 questions

Multiplication Facts

Quiz

•

5th Grade

54 questions

Analyzing Line Graphs & Tables

Quiz

•

4th Grade

$fractions$

22 questions

fractions

Quiz

•

3rd Grade

20 questions

Main Idea and Details

Quiz

•

5th Grade

20 questions

Context Clues

Quiz

•

6th Grade

15 questions

Equivalent Fractions

Quiz

•

4th Grade

Discover more resources for Biology

7 questions

Plant Reproduction in Angiosperms

Interactive video

•

11th Grade - University

7 questions

DNA, Chromosomes, Genes, and Traits: An Intro to Heredity

Interactive video

•

11th Grade - University

7 questions

Ecological Succession: Nature's Great Grit

Interactive video

•

11th Grade - University

42 questions

Plant Tax

Quiz

•

University

20 questions

Endocrine System

Quiz

•

University

7 questions

Immune System

Interactive video

•

11th Grade - University

7 questions

Mutations (Updated)

Interactive video

•

11th Grade - University

10 questions

Mega Genetics Review

Interactive video

•

11th Grade - University

Ch 2

46 questions

The four most abundant elements in living organisms are:

Carbon-14 has the same:

All matter on earth, both living and non-living, is made up of:

Of all the elements that occur on earth, how many are found in your body?

The thing that distinguishes one element, such as chlorine, from another, such as neon, is the number of:

What would happen if you subdivided an atom of sodium?

True or False: A piece of silver can be cut indefinitely into pieces and still retain all of the properties of silver.

Which statement describes an atom of oxygen?

Carbon:

Which of these atoms is most likely to be involved in a chemical reaction?

Access all questions and much more by creating a free account

Popular Resources on Wayground

Discover more resources for Biology