c hemical bonds aims: to learn basic vocabulary used when talking about chemical bonding
TRANSCRIPT
TYPES OF CHEMICAL BONDINGKEY WORDS: bond = veza attractive forces =
privlacne sile interact = medjusobno
delovati valence electron =
valentni elektron electron shell =
elektronska ljuska, omotac
positively charged = pozitivno naelektrisan
negatively charged = negativno naelektrisan
oppositely charged = suprotno naelektrisan
particle = cestica
repel = odbijati attract = privlaciti share = deliti properties =
karakteristike, osobine crystalline = kristalni dissolve = rastvoriti solution = rastvor acid = kiselina row = red outermost = spoljni core = jezgro diverse = razlicit
READ THE TEXT AND FIND THE WORDS WHICH HAVE THE SAME/OPPOSITE MEANING AS THE FOLLOWING WORDS.
bond, link, connection = t_______
are located in = r_____
remember = r________
attract ↔ r________ happen = o________ get = g________ characteristics =
p__________
think about = c______
stinking, unpleasant = f_________
happen = t____ p____
spring up, jump up = b________
different = d_________
READ THE TEXT AND FIND THE WORDS WHICH HAVE THE SAME/OPPOSITE MEANING AS THE FOLLOWING WORDS.
bond, link, connection = tie
are located in = reside
remember = recall attract ↔ repel happen = occur get = gain characteristics =
properties
think about = consider
stinking, unpleasant = foul
Happen = take place
spring up, jump up = bounce
different = diverse
COVALENT BONDS
Explain what a covalent bond is. What is a covalent bond compared to? What is the shared electron compared to? Which molecules were mentioned as
examples of: a) a single covalent bond b) a double covalent bond c) a triple covalent bond How can you predict if the bonds are
covalent or not?
READ THE TEXT AND FIND THE WORDS WHICH HAVE THE SAME MEANING AS THE FOLLOWING WORDS.
breathe out = e______ separate, distinct = d_______ give = d_________ part = p________ element = c_________ guess = p_________ join together = s_______ t______
READ THE TEXT AND FIND THE WORDS WHICH HAVE THE SAME/OPPOSITE MEANING AS THE FOLLOWING WORDS.
breathe out = exhale separate, distinct = discrete give = donate part = portion element = component guess = predict join = stick together
IONIC BONDSKEY WORDS
get over = preboleti, pomiriti se sa necim saltshaker = slanik strip = skinuti, uzeti charge = naelektrisanje Opposites attract. = Suprotnosti se privlace. lose = izgubiti loss = gubitak unlike = za razliku od exist = postojati solid = cvrsta supstanca
READ THE TEXT CAREFULLY AND ANSWER THE FOLLOWING QUESTIONS.
Which example of ionic bond is given in the text?
What holds two oppositely charged atoms together?
What’s the difference between sodium chloride and barium chloride?
What kinds of elements usually form ionic bonds?
What other examples of ionic bonds are mentioned?
POLAR COVALENT BONDSKEY WORDS
playground = igraliste
preschoolers = predskolac
on average = u proseku
determine = odrediti
measure = meriti draw = vući
corresponding = koji odgovara
value = vrednost devise = smisliti,
napraviti increase = povecati
se toddler = dete koje
tek uci da hoda tug = vući
CHOOSE THE WORD WHICH BEST COMPLETES THE SENTENCE.
1. This means that sometimes in a covalent bond the electrons are not _____equally between the two atoms.
a) sharingb) sharedc) share 2. Electronegativity is a _______ of an atom's ability to draw
its bonding electrons to itself.a) measureb) determine c) calculate 3. Electronegativity ________ from left to right going across a
period.a) decreasesb) biggerc) increases
PROGRESS TEST QUESTIONS
A
1. Atoms are the building blocks of all substances. But what is it that keeps atoms connected together? They are held together by _____________ (CHEMISTRY) BONDS, strong ______________ (attract) forces between atoms.
2. An IONIC BOND occurs when one atom gains a valence electron from a ______________ (difference) atom, forming a negative ion (ANION) and a positive ion (CATION), respectively.
B
1. A molecule that has oppositely charged ends is called a P _ _ _ _ MOLECULE.
2. In the formula H2O, the number 2 is a S _ _ _ _ _ _ _ _.
A
1. Atoms are the building blocks of all substances. But what is it that keeps atoms connected together? They are held together by CHEMICAL BONDS, strong attractive forces between atoms.
2. An IONIC BOND occurs when one atom gains a valence electron from a different atom, forming a negative ion (ANION) and a positive ion (CATION), respectively.
B
1. A molecule that has oppositely charged ends is called a POLAR MOLECULE.
2. In the formula H2O, the number 2 is a SUBSCRIPT.
COMPONENT EXIST FORM SHARE MADE UP
Oxygen does not _________ as a single oxygen atom, but as a molecule of two oxygen atoms. These two oxygen atoms _________ two pairs of valence electrons (four valence electrons total) between them, forming a DOUBLE COVALENT BOND. This is true of any double covalent bond; four valence electrons are shared between two atoms. Another _________ of air is nitrogen. Like oxygen, nitrogen does not exist as a single nitrogen atom, but as a molecule ___________of two nitrogen atoms. The two nitrogen atoms in a molecule of nitrogen share three pairs of valence electrons (six valence electrons total) to _________a TRIPLE COVALENT BOND.
Oxygen does not exist as a single oxygen atom, but as a molecule of two oxygen atoms. These two oxygen atoms share two pairs of valence electrons (four valence electrons total) between them, forming a DOUBLE COVALENT BOND. This is true of any double covalent bond; four valence electrons are shared between two atoms. Another component of air is nitrogen. Like oxygen, nitrogen does not exist as a single nitrogen atom, but as a molecule made up of two nitrogen atoms. The two nitrogen atoms in a molecule of nitrogen share three pairs of valence electrons (six valence electrons total) to form a TRIPLE COVALENT BOND.