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