CHEMICAL BONDSAims: to learn basic vocabulary used when talking about chemical bonding

TABLE SALT

SILVER ATOMS

A WATER MOLECULE

OXYGEN MOLECULES

A SODIUM ATOM TRANSFERS AN ELECTRON TO A CHLORINE ATOM TO CREATE TABLE SALT

Chemical bonding

What kinds of chemical bonds are there?

CovalentIonicMetallic

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.