10) From the atomic mass, one can deduce the number ofin each atom of an element
ID: 268054 • Letter: 1
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10) From the atomic mass, one can deduce the number ofin each atom of an element. 10) A) neutrons C) protons plus neutrons B) electrons D) protons 11) A covalent chemical bond is one in which A) an electron from a full outer electron shell of one atom is shared so as to occupy the outer electron shell of both atoms. B) protons and neutrons are shared by two atoms so as to satisfy the requirements of both atoms C) outer-shell electrons of two atoms are shared so as to occupy the outer electron shells of both atoms. D) electrons are removed from one atom and transferred to another atom so that the two atoms become oppositely charged. 12) An atom has 6 electrons in its outer shell. How many unpaired electrons does it have? 12) A) 0 B) 2 C)4 D) 6 E) 2 or 4 13) What results from an unequal sharing of electrons between atoms? 13) A) a polar covalent bond C) a nonpolar covalent bond B) an ionic bond D) a hydrophobic interaction 14) Which of the following correctly describes any reaction that has reached chemical equilibrium? 14) A) The concentration of the reactants equals the concentration of the products B) All of the products have been converted to the reactants of the reaction C) The rate of the forward reaction is equal to the rate of the reverse reaction. D) All of the reactants have been converted to the products of the reaction. 15) A strong acid like HCI 15) A) reacts with strong bases to create a buffered solution B) is a strong buffer at low pH C) dissociates completely in an aqueous solution. D) is a strong buffer at high pH 16) Hydrophobic substances such as vegetable oil are 16) A) nonpolar substances that repel water molecules B) charged molecules that hydrogen-bond with water molecules. C) nonpolar substances that have an attraction for water molecules. D) polar substances that have an affinity for water. 17) Research indicates that ibuprofen, a drug used to relieve inflammation and pain, is a mixture of17) two enantiomers, that is, molecules that A) differ in the arrangement of atoms around their double bonds B) have identical chemical formulas but differ in the branching of their carbon skeletons. C) exist in either linear chain or ring forms. D) are mirror images of one another 18) Which two functional groups are always found in amino acids? 18)- A) carbonyl and amino C) carboxyl and amino B) hydroxyl and carboxyl D) ketone and aminoExplanation / Answer
10- ans- Proton + neutron
mass number = proton + neutron
11 ans- outer shell electrons of two atoms are shared so as to occupy the outer electron shells of both.
a covalent bond is one where the electrons are shared.A group of covalently bonded atoms is called a molecule.
12 ans-2
2 electron will go in the s subshell in out of 6.
13 ans-a polar covalent bond
electron pairs in covalent bonds are not always shared equally this affects the properties of compound.
14- ans-C
Forward and reverse reactions continue with no effect on the concentrations of the reactants and products
15 ANS- C- dissociates completely in an aqueous solution.
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