Science pretest quesions ch6

a compound differs from a mixture because is

is held together by chemical bonds

which compound is formed from a tight network of oppositely charged ions

salt, NaCl

often atoms join so that each atom will have

an outermost energy level that is full of electrons

the bonds that hold atoms together behave most like

flexible strings

an ionic bond is a bond that forms between

ions with opposite charges

in which type of bond do atoms share electrons

covalent bonds

the anion formed from an oxygen atoms is called an

oxide ion

Fe2O3 is named iron (III) oxide because it contains

Fe3+ions

the name for the compound with the formula Cr2O3 would be written as

chromium(III) oxide

a carbon atom can bond to 4 other atoms because it has

4 valence electrons

alcohols are organic compounds that contain

carbon, oxygen, and hydrogen

some polymers are elastic because they are made of

tangled chains

which of the following models could be used to compare the sixes of atoms in a molecule

space-filling

there are strong bonds between the atoms in a piece of quartz. these bonds give quartz a

high melting point

the attraction between molecules tends to be ____ the attraction between ions

weaker than

a hydrogen bond between water molecules is which of the following when compared with the bonds within an individual water molecule

it is weaker

a compound with only two atoms would not have a

bond angle

which of the following models would show the

ball and stick

copper atoms are held together by ____ bonds.

metallic

soium has one electron in its outer shell and chlorine has 7 electrons in its outer shell. the atoms will form an_____bond by _____ their electrons

ionic, transferring

oxygen atoms have 6 electrons in their outer shells, when 2 oxygen atoms bond, they will form a ______ bond by _____their electrons

covalent, transferring

an ionic compound of calcium and chlorine would be named

calcium chloride

the covalent compound N2O5 would be named

dinitrogen pentoxide

because overall charge in a compound must be _____, the charge of iron in Fe2O3 can be calculated as 3+

0

the chemical formula for an ionic compound of potassium and oxygen is

K2O

The ____ formula of a compound is written in the simplest whole number ration of atoms

empirical

the formula C6H12o6 would be the ___ formula for glucose

chemical and molecular

the atoms in organic molecules are held together by ____ bonds.

covalent

a chemical formula with the pattern CnH2n+2 must represent an

alkane

ethene differs from ethanen that it has a

double bond

polypropylene would be called a ____ because it contains a repeating pattern of propylenes.

polymer

a _____ is a oplymer that contains many different molecules of amio acids

protein

the polymer _____ determines you genetic makeup

DNA

a polymer of sugar molecules is called a

carbohydrate

a compound is held together by

chemical bonds

in which substance to the molecules have the strongest attractions to one another

sugar, a solid

atoms often join so that each atom will have

an outermost energy level that is full of electrons

in a metallic bond, the nucleus of one atom is attracted by a nearby atom's

electrons

the name for the compound with the formula CuBr2 would be written as

copper(II) bromide

Formaldehyde, CH2O, an acetic acid, C2H4O2, have the same empirical formula bu different

molecular formulas

the simplest organic compound is

methane

a protein is a polymer that is made of

amino acids

gases take up a lot of space because gas molecules

are not attracted to one another

covalent bonds are formed between

nonmetal atoms

copper is a good conductor of electricity because its electrons

can move from atom to atom

the name dinitrogen tetroxide tells you that this compound contains

2 N atoms and 4 O atoms

when copper combines with oxygen to form copper(II) oxide, the charge of the copper ion is

Cu2+

It is possible for different covalent compounds to have the same empirical formula because empirical formulas represent

a ration of atoms in the compound

how many chemical bonds can carbon from with other atoms

4

alkanes are hydrocarbons that contain

single covalent bonds only

formed by atoms in metals packing electrons close together

metallic bond

positive and negative ions are formed

ionic bond

usually occurs between nonmentals

covalent bond