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Chemistry unit 4

QuestionAnswer
formula of silver and selenium Agse2
formula of Barium oxygen Ba20
formula of lithium sulfur Li2s
formula of potassium and phosphorus K3p
formula of strontium and nitrogen Sr2N
formula of zinc and fluorine Znf2
formula of ca p Ca2p
formula of Li Cl LiCl
formula of Ba br Ba Br2
formula of Na S Na2
formula of Ag O Ag o
Determine whether the following bonds are ionic,or covalent.
K--Br Ionic
c---o Covalent
Na---O Ionic
C---H covalent
Br---Br covalent
O----H covalent
Cs---Cl ionic
H----F covalent
Fe-----o ionic
S----H covalent
Describe how an ionic bond and covalent bond different. Ionic is where one element touch on electrons whereas, covalent , the atoms must share.
The nuclei of carbon and silicon have about the same tendency to attract electrons. what can you say about a chemical bond formed these two elements? ehat type would it be? covalent bond 2 nonmetals
Is highly soluble in water Ionic
Has a melting point of 1550C ionic
is hard, rough crystal ionic
When dissolved in water, does not conduct electricity covalent
is a gas at room temperature covalent
when dissolved in water, conduct electricity covalent
is a solid at room temperature ionic
Has a boiling point of 10C covalent
Is composed of metal and a nonmetals ionic
Is composed of a nonmetals and nonmetals covalent
Attractive forces between its "parts" are week Covalent
Attractive forces between its "parts" are strong ionic
Not very soluble in water covalent
Plastic water bottle (soft; melts easily): covalent
Concrete (hard; extremely high melting point) ionic
Gasoline (vaporizes readily, flammable: covalent
candy corn (soft; melts easily): covalent
Hydrogen and oxygen covalent
Magnesium and sulfur Ionic
Strontium and fluorine ionic
carbon and oxygen covalent
Magnesium and nitrogen Ionic
Nitrogen and oxygen covalent
Hydrogen and nitrogen covalent
Lithium and oxygen ionic
oxygen and fluorine covalent
Bromine and oxygen covalent
Hydrogen and iodine covalent
Magnesium and hydrogen ionic
The elements in column 18 of the periodic table are chemically inactive. True
All of the noble gases gas elements except neon have eight electrons in their outer most energy level. false helium
In covalent bonding, atoms can achieve a full octet of electrons by sharing electrons. true
A typical potassium ion has a positive charge because it has lost an electron. true
The following electrons dot structure shows a bromine atoms has lost an electrons to become an (br) ion. false gained
A crystal of the compound potassium fluoride consists of potassium and fluoride molecules. False ions
The formula for methane, CH4, indicate that each methane molecules contains one carbon atom and four hydrogen atoms. true
The stability of the the noble gas elements other than helium is a result of their having eight valence electrons True
Calcium has two valence electrons, and to become stable , it must gain two more electrons. False lose two
Argon is a noble gas elements. true
An ions is an atoms or group of atoms that is changed because it has lost or gained one or more than protons. False electrons
Compound with ionic bonds tend to be brittle. True
The formula C3H8 tells you that this compound contains three carbon atoms and eight hydrogen atoms. true
Covalent bonds involve electrons shared between two atoms. True
In the electrons dot structure HC1 the pair of dots between the H and CL means that the hydrogen and chlorine atoms transfer a pair of electrons between them False share
Two atoms cannot share more than one pair of electrons between them. False can
In general, ionic compounds are more likely to dissolves in water than are covalent compound. True
Ionic compound conduct an electric current in the melted state. True
The force of attraction between molecules tend to be strong. False weak
Sugar is an example of covalent compound. True
Formula of Sodium and iodine is NaI
Use each of the terms below just once to complete the passage. Fill in the blanks
When it react with a fluorine atoms, a potassium atoms loses one electrons, forming (n)(1). Ion
Fluorine gains the electrons and charged atoms attract each other, This attraction is called. Ionic bond
The type of compound formed in this reaction, potassium fluoride, is called a (n). Ionic compound
As a result of this reaction, the atoms of both potassium and fluorine have a stable set of outer electrons, an arrangement known as a(n) is. Noble gases configuration
The statement that predicts that potassium will become stable by losing one electron and that fluorine will become stable by gaining one electron is the . Octet rule
The regular, repeating arrangement in potassium fluoride is called a(n) is. Crystal
Potassium and fluoride, like other compound of the same general type, is a (n) is. Electrolyte
In contrast to potassium fluoride, nitrogen monoxide is a(n)is. covalent compound
Because nitrogen atoms in it share electrons with oxygen atoms in a kind of bond known as a(n). Covalent bond
In contrast to potassium fluoride, the smallest unit of nitrogen monoxide is a(n) is. Molecules
The force of attraction between particles, which is called. Interparticle force s very different in these two compounds.
Both potassium fluoride and nitrogen monoxide are represented by a set of chemical symbols that represent their composition the formula for potassium fluoride, foe example is KF, and for nitrogen monoxide, is No. Formula
Multiple Bonds Define the following
Single bonds: When an atoms share a pair of electrons
Double bonds: sharing two electrons
Triple bonds: sharing three electrons
Oxidation numbers review Elements sheet
Chlorine 7 valence electrons gain 1 oxidation number 1-
Potassium 1 valence electron lose 1 oxidation Number +1
magnesium 2 valence electrons lose 2 oxidation number 2+
Fluorine 7 valence electrons gain 1 oxidation number 1-
Aluminum 3 valence electrons lose 3 oxidation number 3+
Sodium 1 valence electron lose 1 oxidation number 1+
Nitrogen 5 valence electron gain 2 oxidation 3-
Oxygen 6 valence electron gain 2 oxidation number 2-
Hydrogen 1 valence electron lose 1 oxidation number 1+
Iodine 7 valence electrons gain 1 oxidation number 1-
Phosphorous 5 valence electrons gain 3 oxidation number 3-
Calcium 2 valence electrons lose 2 oxidation number 2+
Sulfur 6 valence electrons gain 2 oxidation number 2-
An atoms that gain one or more electrons will have a. Negative charge
An atoms that loses one or more electrons will have a positive charge
An atoms that gains or loss one or more electrons is called an Ions
A positive ions is called a ------------and negative ions is called an -----------. Caution, an ion.
What type of elements one (metals or nonmetals)? Elements two/ Both nonmetals
In ionic bonding metals ------------their electrons to nonmetals so they have a filled outer energy level. Lose
In covalent bonding nonmetals -----------their electrons so they both have a filled outer energy level. Share
When ------ form, they have -------- that differ greatly from the properties of the --------- from which they are. Compound, properties, elements,made
The ------- of the compound depend on what happens to their constituent ----------- when the compounds------------. properties, atom, form.
-------------- properties provide clues about what happens on the --------- level. Microscope, secpre.
Table salt compounds
Water Compound
Sulfur Elements
Chlorine gas Elements
Carbon dioxide gas compound
Dry ice Compound
Properties of Ionic compound
Common Phase Crystalline Solids
Melting High
Breaking of bonds Very strong
Solubility Many soluble in water but not in nonpolar liquid.
Conduction Conduct electricity when melted.
Properties of Covalent compound
Common Phase Gases, liquid , or water solids.
Melting low
Breaking of bonds Soft or brittle solid forms
Solubility Many soluble in nonpolar liquids but in water.
Conduction Poor electrical conductors in all phases.
Created by: awais.jat