chapter 2: chemical bonds and compounds elements combine to form compounds chemical bonds hold...

Chapter 2: Chemical Bonds and Compounds

Elements Combine to Form

Compounds

Chemical Bonds Hold Compounds

Together

Ionic/Covalent Bonds Terms

100 100 100 100

200 200 200 200

300 300 300 300

400 400 400 400

500 500 500 500

Most substances around us are known as _____________.

Compounds

The atoms of different elements are held together in compounds by

__________ _________.

Chemical Bonds

How do the properties of a compound compare with the

properties of the elements that make it?They are often quite different. For

example, water is made of 2 hydrogen atoms and 1 oxygen atom. At room temperature, H

and O are both colorless, odorless gases, and they remain gases

down to extremely low temperatures. Water, however, is

a liquid at temps up to 100 degrees Celsius and a solid below

O degrees Celsius.

Why is the ratio of atoms in a chemical formula so important?

Different ratios of elements indicate

different compounds.

Which ratio correctly depicts NO2 ?

A.2:1B.1:1C.1:2

D.None of the above

C. 1:2

What type of charge does an atom’s nucleus contain?

Explain why.

Positive charge b/c only protons (+) and neutrons (no charge) are contained in the

nucleus

What are formed when atoms gain or lose electrons?

Ions

Using your periodic tableWhat type of compound is Potassium

Bromide (KBr)?

Ionic Compound—why??

True or False. In a covalent bond, the atoms usually form

regular-shaped (lattice) structures.

False; ionic bonds.

What are two of the three forms of the element carbon that your

textbook refers to?

1. Diamond- hardest natural substance, useful for cutting other substances, and made entirely of

carbon. 2. Graphite- dark, slippery component of pencil

“lead,” and form two-dimensional layers. 3. Fullerene- contains large molecules, one type

is shaped like a soccer ball.

In a covalent bond, two ________ are bonding to form

a covalent compound.

Nonmetals

What are being stolen in an ionic bond?

Electrons

Which of the following is NOT a property a metal?

A.They are good conductors of electricity

B.They are good conductors of heatC.They are NOT easy to bend

D.They are shiny

C. They are NOT easy to bend

In this particular bond, electrons are shared equally.

Covalent

What is at least ONE property of a metal?

1. Conduct electricity well2. Conduct heat well3. Easily pounded/shaped/bent

It is describing the number of atoms that particular element contains in

that compound.

What does a subscript tell us when written in a chemical

formula?

What is a metallic bond?

A bond in which electrons are shared equally among the atoms of a metal.

A molecule is a group of atoms held together

by ______ bonds.

Covalent

Please list at least 3 types of bonds.

Chemical bonds are what hold atoms together in compounds. Chemical bonds can effect the compound’s properties.

1.Ionic bonds2.Covalent Bonds

3.Polar Covalent Bonds4.Metallic Bonds

Using your periodic table, please determine if C2H6O (ethanol) if it is a

covalent or ionic compound.

Covalent Compound