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A Substance That Cannot Be Broken Down Into Other Substances By Ordinary Chemical Procedures Is A

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Home > 2: The Chemical Context of Life > Pre-Test

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Chapter 2: The Chemical Context of Life Pre-Test

Pre-Test

1 .A substance that cannot be broken down into other substances by ordinary chemical procedures is a(n) _____. (Concept 2.1) molecule element compound isotope proton 2 .Which of the following is a trace element required by most living organisms? (Concept 2.1) oxygen magnesium nitrogen carbon hydrogen 3 .Which of the following subatomic particles always has a positive charge? (Concept 2.2) proton neutron electron atom element 4 .Changing the number of _____ would change an atom into an atom of a different element. (Concept 2.2) bonds formed by an atom electrons circling the nucleus of an atom protons in an atom particles in the nucleus of an atom neutrons in an atom 5 .The atoms of different phosphorus isotopes _____. (Concept 2.2) have different atomic numbers have different numbers of neutrons react differently with other atoms have different numbers of electrons have different numbers of protons 6 .How an atom chemically behaves when it comes into contact with other atoms is determined by its _____. (Concept 2.2) nucleus size; smaller things are chemically more reactive protons neutrons electron configuration 7 .Which of the following holds atoms together in a molecule? (Concept 2.3) ionic bonds between atoms the transfer of protons from one atom to another the sharing of electrons between atoms the loss of neutrons by atoms the sharing of protons between atoms 8 .Hydrogen bonding is most often seen _____.

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(Concept 2.3) in molecules whose three-dimensional shape is tetrahedral when hydrogen is covalently bonded to an electronegative atom when multiple carbon atoms are present if the molecule consists of three or fewer atoms when the bonds within the molecule are nonpolar covalent bonds 9 .An ionic bond is formed when _____. (Concept 2.3) both atoms are equally attractive to electrons atoms are subjected to radioactive isotopes one atom transfers an electron to another atom both atoms are nonpolar both atoms are electrically neutral 10 .Which of the following is not a chemical reaction? (Concept 2.4) Glucose (C6H12O6) and oxygen gas (O2) combine to form carbon dioxide (CO2) and water (H2O). Sodium metal and chlorine gas Cl2 unite to form sodium chloride (NaCl). Hydrogen gas (H2) combines with oxygen gas (O2) to form liquid water (H2O). Solid ice melts to form liquid water. ©2005 Pearson Education, Inc., publishing as Benjamin Cummings

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