Week 2 Practice Quiz Flashcards
Elements that have atoms with full outer shells of electrons A) Will form many compounds B) Will normally form anions C) Will normally form cations D) Frequently form hydrogen bonds E) Are inert
E) Are inert
The chemical behaviour of an atom is determined by
A) The number of protons
B) The number of neutrons
C) The number and arrangement of electrons
D) The size of the atom
E) The mass of the atom
C) The number and arrangement of electrons
When atoms complete their outer electron shell by sharing electrons, they form A) Ionic bonds B) Covalent bonds C) Hydrogen bonds D) Anions E) Cations
B) Covalent bonds
In a molecule of nitrogen, three pairs of electrons are shared by two nitrogen atoms. The type of bond that is formed would bean example of a A) Single covalent bond B) Double covalent bond C) Triple covalent bond D) Polar covalent bond E) Hydrogen bond
C) Triple covalent bond
If a pair of electrons is unequally shared between two atoms, a \_\_\_\_\_ occurs A) Single covalent bond B) Double covalent bond C) Triple covalent bond D) Polar covalent bond E) Hydrogen bond
D) Polar covalent bond
Ions with a positive charge are called A) Cations B) Anions C) Radicals D) Poly atomic ions E) Isotopes
A) Cations
Ionic bonds are formed when
A) Atoms share electrons
B) Electrons are completely transferred from one atom to another
C) A pair of electrons is shared unequally by two atoms
D) Hydrogen forms bonds with negatively charged atoms in the same or different molecule
E) Two or more atoms lose electrons at the same time
B) Electrons are completely transferred from one atom to another
In living cells, the weakest bond between two or more atoms is the \_\_\_\_\_\_ bond A) Ionic B) Covalent C) Polar D) Nonpolar E) Hydrogen
E) Hydrogen
Which one of the following statements is not correct about the reaction H2 + Cl2 (right arrow) HCl?
A) H2 and Cl2 are the reactants
B) HCl is the product
C) One molecule of hydrogen contains 2 atoms
D) Two molecules of HCl are formed in the reaction
E) This reaction is an example of a decomposition reaction
E) This reaction is an example of a decomposition reaction
AB (right arrow) A + B is to decomposition as A + B (right arrow) AB is to A) Exchange B) Synthesis C) Combustion D) Replacement E) Metabolism
B) Synthesis
Inorganic compounds that are soluble and whose ions will conduct an electrical current are called A) Hydrophobic B) Electrolytes C) Covalent bonds D) Polar covalent molecules E) Hydration spheres
B) Electrolytes
The bond between sodium and chloride in the compound sodium chloride (NaCl) is A) An ionic bond B) A single covalent bond C) A nonpolar covalent bond D) A double covalent bond E) A double ionic bond
A) An ionic bond
Identify cations from the following: A) Na+ B) Cl- C) K+ D) A and B E) A and C
E) A and C
An anion would best be represented by which of the following. A) Na+ B) Cl- C) K+ D) A and B E) A and C
B) Cl-
From the following group, indicate one containing only trace elements. A) sulphur, chlorine, oxygen B) selenium, hydrogen, calcium C) boron, oxygen, carbon D) silicon, fluorine, tin E) cobalt, calcium, sodium
D) silicon, fluorine, tin
A needle floating on the surface of a glass of water best illustrates A) surface tension B) chemical tension C) subatomic particles D) cation action E) anion action
A) surface tension
An example of an organic substance is A) table sugar B) sodium C) table salt D) oxygen E) nitric oxide (NO)
A) table sugar
An example of an inorganic substance is A) fructose B) water C) lipid D) glycogen E) cholesterol
B) water
What element is the most plentiful in the human body? A) sulfur B) sodium C) oxygen D) potassium E) carbon
C) oxygen
What element is the second most abundant in the human body? A) oxygen B) carbon C) hydrogen D) nitrogen E) calcium
B) carbon
The molecule CO2 is known as A) carbonised oxygen B) carbonated oxygen C) carbon monoxide D) carbon oxide E) carbon dioxide
E) carbon dioxide
The molecule H2 is known as A) hydro. B) hydrogen C) hydroxide D) helium E) Helios
B) hydrogen
The molecule O2 is known as A) oxide B) oxygen C) organic D) B and C E) none of the above
B) oxygen
The basic units of matter include \_\_\_\_\_ or \_\_\_\_\_\_. A) atoms; elements B) protons; neutrons C) protons; electrons D) neutrons; electrons E) cells; tissues
A) atoms; elements
H2O is an example of a A) ionic formula B) glucose molecule C) molecular formula D) sodium molecule E) covalent formula
C) molecular formula
A nanometer is A) 10-6 meter B) 10-8 meter C) 10-9 meter D) 10-10 meter E) 10-12 meter (The -6 etc are little eg.m2)
C) 10-9 meter
When electrons are transferred from one atom to another, and the two atoms unite as a result of the electrostatic attraction, A) an ion is formed B) a molecule is formed C) a hydrogen bond is formed D) an ionic bond is formed E) a covalent bond is formed
D) an ionic bond is formed
Calcium atoms have two electrons in the outermost shell. As a result, you would expect calcium to form ions with a charge of A) +1 B) +2 C) -1 D) -2 E) 0
B) +2
Magnesium atoms have two electrons in the outermost shell and chlorine atoms have seven. The compound magnesium chloride would contain
A) 1 magnesium and 1 chlorine
B) 1 magnesium and 2 chlorine
C) 2 magnesium and 1 chlorine
D) 2 magnesium and 7 chlorine
E) impossible to tell without more information
B) 1 magnesium and 2 chlorine
Each of the following statements concerning hydrogen bonds is true, except one. Identify the exception.
A) hydrogen bonds are strong attractive forces between hydrogen atoms and negatively charged atoms
B) hydrogen bonds can occur within a single molecule
C) hydrogen bonds can form between neighbouring molecules
D) hydrogen bonds are important forces for holding large molecules together
E) hydrogen bonds are responsible for many of the unique properties of water.
A) hydrogen bonds are strong attractive forces between hydrogen atoms and are negatively charged atoms
A ______ is a substance that consists entirely of atoms with the same atomic number
Element
The centre of an atom is called the _______
Nucleus
Electrons whirl around the centre of the atom at high speed forming a ________ _______.
Electron cloud
Electrons in an atom occupy an orderly series of electron shells or ________ ________.
Energy levels
A ______________ is a combination of two or more atoms and has a different physical and chemical properties than its individual atoms.
Compound
Ions with a positive charge are called _________
Cations
Ions with a negative charge are called _________.
Anions
In a _________ _________ chemical bonds between atoms are broken as atoms are rearranged in a new combination to form different chemical substances.
Chemical reaction
A ___________ is a homogeneous mixture contains a solvent and a solute
Solution
___________ are solvable inorganic compounds whose ions will conduct an electric current in solutions.
Electrolytes
Molecules that readily dissolve in water are called _________
Hydrophilic
Molecules that do no dissolve in water are called __________
Hydrophobic
The molecular formula for water is ________
H2O
