Wiley Plus Ch. 2

The symbol Ca2+ represents a calcium A ion B isotope C molecule D atom

A ion

Which of following is considered a compound? A H2 B NaCl C O2 D N2

B NaCl

The element represented by the chemical symbol F is

fluorine

Which of the following applies to inorganic compounds? Select all that apply. A cannot be used by cells to perform biological functions B carbon dioxide C always have covalent bonds D always contain carbon E water F structurally simple

A cannot be used by cells to perform biological functions B carbon dioxide E water F structurally simple

Which of the following is/are true regarding radioisotopes? Select all that apply. A used in medical imaging procedure B used to treat a variety of cancers C have no beneficial uses D used as tracers to follow movement of substances in the body E used as antioxidants

A used in medical imaging procedure B used to treat a variety of cancers D used as tracers to follow movement of substances in the body

Hydrogen has one proton and one electron. How many covalent bonds can a hydrogen atom form? A 0 B 1 C 3 D 2

B 1

If an atom has an atomic number of 17 and a mass number of 35, how many neutrons are in the nucleus? A 35 B 18 C 52 D 17

B 18

Hydrophobic molecules A are attracted to water B do not dissolve in water C mix well with water D are very soluble

B do not dissolve in water

If an atom has 20 neutrons, and a mass number of 39, how many electrons does the element have? A 39 B 20 C 19 D 34

C 19

All electrolytes are A liquids B acids C bases D ions

D ions

A substance that contains atoms of two or more different elements is called a

compound

If the number of ______ is known, any element can be identified.

proton

: Which of the following represents the chemical symbol for iodine? A I B Mn C F D Cr

A I

Which of the following is/are true regarding organic compounds? Select all that apply. A many are large and carry out complex functions B useful in building body structures C held together by hydrogen bonds D contain carbon E all dissolve easily in water F contain distinctive functional groups

A many are large and carry out complex functions D contain carbon F contain distinctive functional groups

A solution with a pH of 12 is A neutral B basic C buffered D acidic

B basic

The standard unit for measuring the mass of an atom is called a A valence B ion C dalton D newton

C dalton

Nonpolar covalent bonds occur when valence electrons are A lost B gained C shared unequally D shared equally

D shared equally

Helium has two protons and therefore has ______ electron shell(s).

-1

______ is a component in hemoglobin.

iron

Neon does not participate in bond formation with other atoms. This is because it has _______ electrons in its outer shell. A 8 B 2 C 4 D 6

A 8

Which of the following is an anion? A OH− B S C NaCl D K+

A OH−

The isotopes of O-16, O-17, and O-18 differ in their A atomic weight and number of neutrons B atomic weight C atomic number D number of neutrons

A atomic weight and number of neutrons

When two atoms share two pairs of electrons, a _____________ is formed. A double covalent bond B hydrogen bond C double ionic bond D single covalent bond

A double covalent bond

A sodium atom which has one electron in the valence shell would most likely A lose one electron and become a positive ion B bond with another sodium atom to be stable C share to have a complete shell D gain one electron and become a negative ion

A lose one electron and become a positive ion

Most of the mass of an atom is found in the A nucleus B neutrons only C protons only D electron shells

A nucleus

One Dalton would be equivalent to A one proton or one neutron B one proton only C protons plus neutrons in the nucleus D one neutron only

A one proton or one neutron

A bond in which electrons are not shared equally is called a(n) A polar covalent bond B nonpolar covalent bond C ionic bond D hydrogen bond

A polar covalent bond

In a water molecule, the oxygen and hydrogen atoms are held together by A polar covalent bonds B double covalent bonds C hydrogen bonds D nonpolar covalent bonds

A polar covalent bonds

To change an atom into an atom of a different element, you would need to change the number of A protons B electron shells C neutrons D electrons in the valence shell

A protons

The nucleus of an atom is composed of A protons and neutrons B electrons and neutrons C protons and isotopes D protons and electrons

A protons and neutrons

Salt water is an example of a A solution B concentration C suspension D colloid

A solution

Certain types of insects are capable of walking on water because water has a high A surface tension B polarity C energy level D molarity

A surface tension

Which of the following correctly depicts the structural formula of a molecule? Select all that apply. A H - H B CH4 C O2 D H - O - H E C F H2 O

A H - H D H - O - H

Which of the following describes covalent bonds? Select all that apply. A can form between atoms of the same element B most common chemical bond in the body C forms when electrons are lost or gained D forms when electrons are shared E can be polar or non-polar

A can form between atoms of the same element B most common chemical bond in the body D forms when electrons are shared E can be polar or non-polar

Which of the following applies to hydrogen bonds? Select all that apply. A cannot form bonds between atoms to form molecules B helps to determine the shape of large molecules C occurs due to an attraction between molecules D forms strong bonds compared to ionic bonds E results due to the loss or gain of electrons

A cannot form bonds between atoms to form molecules B helps to determine the shape of large molecules C occurs due to an attraction between molecules

Which of the following is/are considered fibrous proteins? Select all that apply. A keratin B albumin C elastin D fibrin E insulin F dystrophin

A keratin C elastin D fibrin F dystrophin

Which of the following is/are true of chemical reactions? Select all that apply. A the atoms of the reactants are same as the atoms of the products B chemical reactions occur by breaking old bonds and forming new bonds C reactants and products have different chemical properties D total mass of reactants does not equal total mass of products E the reactants and products have the same number of atoms F foundation of all life processes

A the atoms of the reactants are same as the atoms of the products B chemical reactions occur by breaking old bonds and forming new bonds C reactants and products have different chemical properties E the reactants and products have the same number of atoms F foundation of all life processes

The element phosphorous has 15 protons, 16 neutrons, and 15 electrons. Which of the following would be an isotope of phosphorous? A 16 protons, 16 neutrons, 16 electrons B 15 protons, 17 neutrons, 15 electrons C 15 protons, 16 neutrons, 17 electrons D 17 protons, 16 neutrons, 15 electrons

B 15 protons, 17 neutrons, 15 electrons

If an atom has 11 protons, 12 neutrons, and 11 electrons, what is the mass number? A 12 B 23 C 22 D 11

B 23

Nitrogen has a proton number of 7. How many electrons would be in the outermost shell? A 2 B 5 C 14 D 7

B 5

The maximum number of electrons that the second shell of an atom can hold is A 4 B 8 C 6 D 2

B 8

Which of the following is an example of an exchange reaction? A 2H2O ------> 2H2 + O2 B AgNO3 + KCL ------> AgCl + KNO3 C H+ + HCO3 - ------> H2 CO3 D Na + Cl ------> NaCl

B AgNO3 + KCL ------> AgCl + KNO3

Which of the following best describes chemical energy? A walking B a battery C an unopened soda can D a moving vehicle E water that is held by a dam

B a battery

Isotopes are atoms of an element with same number of protons but have A the same number of neutrons B a different number of neutrons C a different number of electrons D a different number of orbitals

B a different number of neutrons

When two or more atoms bond by sharing electrons, they form A an isotope B a molecule C a unit D a catalyst

B a molecule

Regarding water, what do cohesion and surface tension have in common? A both are the results of ionic bonding B both are related to hydrogen bonding C both are the result of the electronegativity of oxygen D both are produced by covalent bonding

B both are related to hydrogen bonding

Which arrangement shows the bonds from strongest to weakest? A hydrogen, covalent, ionic B covalent, ionic, hydrogen C covalent, hydrogen, ionic D ionic, covalent, hydrogen

B covalent, ionic, hydrogen

Positively charged ions called cations are formed when A electrons are gained B electrons are lost C protons are gained D protons are lost

B electrons are lost

The number of bonds that an atom can form is directly related to the number of A protons in the nucleus B electrons in the outermost shell C electrons in the innermost shell D electrons in the nucleus

B electrons in the outermost shell

An electrically charged atom with an unpaired electron in its outermost shell is called a(n) A ion B free radical C valence atom D gas

B free radical

If a neutral atom becomes a negative ion, it has A lost electrons B gained electrons C lost protons D gained protons

B gained electrons

The subatomic particle(s) with no charge in an atom is A protons only B neutrons only C electrons only D electrons and neutrons

B neutrons only

For an atom of an element to be considered electrically neutral A proton number, electron number and neutron number must all be equal B proton number must equal electron number C proton number must equal neutron number D electron number must equal neutron number

B proton number must equal electron number

The atomic mass of an atom is determined by the A electron number only B proton number plus neutron number C neutron number only D proton number plus electron number

B proton number plus neutron number

Hydrophilic molecules A are nonpolar B readily interact with water C never interact with water D form strong hydrogen bonds

B readily interact with water

Ionic compounds normally exist in which physical state? A liquid B solid C mixture D gas

B solid

One characteristic shared by all organic molecules is A they all are isomers B that they all have a carbon skeleton C that they all contain sulfur D the formation of rings

B that they all have a carbon skeleton

Which of the following are true statements regarding matter? Select all that apply. A matter can only be non-living B all forms of matter are made up of chemical elements C matter exists in three states: liquid, solid and gas D matter can be living or non-living E matter exists in two states: liquid and gas

B all forms of matter are made up of chemical elements C matter exists in three states: liquid, solid and gas D matter can be living or non-living

Which of the following is/are true regarding the element oxygen? Select all that apply. A needed for blood clotting B used temporarily to store chemical energy C makes body fluids more acidic D used to generate ATP E makes up 18.5% of total body mass

B used temporarily to store chemical energy D used to generate ATP

The maximum number of electrons that the first shell of an atom can hold is A 8 B 6 C 2 D 4

C 2

If an atom has 19 protons, and a mass number of 39, how many neutrons does the element have? A 58 B 23 C 20 D 19

C 20

There are 92 naturally occurring elements on Earth. How many of these elements are normally found in the human body? A 4 B 8 C 26 D 14

C 26

If the second shell (valence shell) of an atom has 2 electrons, how many more does it need to be stable? A 4 B 8 C 6 D 1

C 6

Which of the following is considered a molecule and a compound? A H2 B O2 C H2O D N2

C H2O

If two types of compounds found in the same solution are not bonded to each other, the solution is called a A a concentration B a colloid C a mixture D suspension

C a mixture

Which of the following are double-ringed purines? A cytosine and guanine B adenine and cytosine C adenine and guanine D adenine and thymine

C adenine and guanine

The electrons of an atom A always equal the number of protons plus neutrons B have a neutral charge C are found orbiting the nucleus D are found in the nucleus

C are found orbiting the nucleus

A bond formed by the sharing of electrons between atoms is called a(n) A inert bond B ionic bond C covalent bond D hydrogen bond

C covalent bond

Water is a polar molecule because A because each oxygen atom is bonded to two hydrogen atoms B it does not have a charge C different parts of the molecule have slightly different charges D it has an overall positive charge

C different parts of the molecule have slightly different charges

egarding bonds, this symbol = means that the bond is a(n) A nonpolar covalent bond B single covalent bond C double covalent bond D ionic bond

C double covalent bond

The subatomic particles in an atom that are move around the nucleus are A protons and neutrons B neutrons only C electrons only D protons only

C electrons only

An isotope of boron would A have more electrons than the usual boron atom B be positively charged C have more neutrons than the usual boron atom D be negatively charged

C have more neutrons than the usual boron atom

The overall charge of an atom is A variable B negative C neutral D positive

C neutral

The atomic number of an element is determined by the number of A neutrons B protons plus neutrons C protons D electrons

C protons

The electron shell model of an atom is useful in describing A the exact location of all the neutrons B the amount of energy found in an electron C the arrangement of electrons outside the nucleus D the properties of an atom

C the arrangement of electrons outside the nucleus

Which of the following is used as a basis for the pH scale? A the amount of water in a solution B the concentration of OH- in moles per liter C the concentration of H+ in moles per liter D the percentage of hydrogen bonds in moles per liter

C the concentration of H+ in moles per liter

Which of the following statements apply to water? Select all that apply. A low heat capacity B is a non-polar molecule C functions as a lubricant D can participate in many reactions E forms solutions F most abundant compound in the body G considered the universal solvent

C functions as a lubricant D can participate in many reactions E forms solutions F most abundant compound in the body G considered the universal solvent

: If an atom has 11 protons, and a mass number of 23, how many electrons does the element have? A 34 B 23 C 12 D 11

D 11

Chlorine has 17 protons. How many electrons would chlorine have when it is electrically neutral? A 16 B 2 C 18 D 17

D 17

If an atom has 4 electrons, what is the atomic number? A 6 B 8 C 2 D 4

D 4

Water molecules can form hydrogen bonds with how many other water molecules? A 6 B 2 C 1 D 4

D 4

Which of the following would affect the speed of a chemical reaction? A temperature B presence of a catalyst C increased concentration of the reactants D all of the choices are correct

D all of the choices are correct

Trace elements A are only found as radioactive isotopes B are important but not essential for normal body functions C are used as tracers in medical imaging D are required in very small amounts

D are required in very small amounts

The octet rule states that A only atoms with eight electrons in the outer shell are stable B there must be at least 8 protons in the nucleus of every atom C the first shell is full with eight electrons D atoms will lose or gain electrons to obtain eight electrons in the outer shell

D atoms will lose or gain electrons to obtain eight electrons in the outer shell

Compounds that have the general formula CH2O are A nucleotides B lipids C proteins D carbohydrates

D carbohydrates

Which pentose sugar is found in DNA? A glucose B lactose C ribose D deoxyribose

D deoxyribose

The difference between an atom and an ion of the same element is in the number of A protons B neutrons C both protons and electrons D electrons

D electrons

When atoms interact chemically with other atoms, they lose, gain, or share A protons B neutrons C protons and neutrons D electrons

D electrons

Negatively charged ions called anions are formed when A protons are gained B protons are lost C electrons are lost D electrons are gained

D electrons are gained

Hydrogen bonds A form between hydrogens in different molecules B form between hydrogens in a molecule C are very strong bonds D hold water molecules together

D hold water molecules together

To form a molecule of methane (CH4), a carbon atom will form A four separate double covalent bonds with four hydrogens B four hydrogen bonds with surrounding water molecules C one ionic bond with each of the four hydrogens D one covalent bond with each of the four hydrogens

D one covalent bond with each of the four hydrogens

A molecule that has a slightly negative end and a slightly positive end is called a(n) A nonpolar molecule B electrolyte C charged molecule D polar molecule

D polar molecule

In a suspension, the solutes will eventually A blend B disintegrate C evaporate D settle out

D settle out

Atoms that share three pairs of electrons are joined by a(n) A single covalent bond B triple hydrogen bond C ionic bond D triple covalent bond

D triple covalent bond

If an atom has an atomic number of 9, which charge would be correct when the atom becomes an ion. A +1 B +2 C −2 D −1

D −1

The element represented by the chemical symbol Fe is

iron

During ionization if chlorine gains an electron, its charge changes from neutral to .

negative