1.04 Compounds Day 2

Key Ideas: 

1.  Two or more atoms interact to form new substances, which are held together by electrical bonds (6.5d).

2.  Compounds may be represented by chemical formulas (6.5e).

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1.04 Compounds

Made of 1 type of atom.

Element

Begins with a capital letter, followed by a lower case letter. A short way of identifying an element.

​​Chemical Symbol

A substance formed by chemically bonding atoms from 2 or more different elements.

Compound

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​

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is an example of an element. ​

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is an example of a chemical symbol. ​

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is an example of a compound.

A short way to write the number of atoms and elements present in a compound.

​​Chemical Formula

Shows how elements rearrange to form new substances.

Chemical Equation

Always follows the element it goes with. The number in a chemical formula that tells us how many atoms of each element are present.

Subscript

Always goes before the molecule it represents. Tells us how many of that molecule is present in the chemical equation.

​​Coefficient

Match

Match the following

• Subscript

• Chemical Symbol

• Chemical Formula

• Coefficient

• Chemical Equation

# of atoms of the element it represents

Show way to write the name of an element

Shows elements present in a substance

The # of molecules in chemical equation

Shows how elements form new substances.

• # of atoms of the element it represents

• Show way to write the name of an element

• Shows elements present in a substance

• The # of molecules in chemical equation

• Shows how elements form new substances.

Chemical Formula

Elements:
H = hydrogen
O = oxygen

​H₂O

​Count the number of capital letters in the formula. That tells you how many elements are present.

​2 capital letters
2 elements

Chemical Formula

Numbers
2
No number

​H₂O

Look for subscript numbers

​2 hydrogen atoms
1 oxygen atom

​When there is no subscript number behind a chemical symbol, it means there is only one atom of that element.

Dropdown

The number of capital letters in this chemical formula is

​

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. The number of ​

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in this chemical formula is two. The subscript number for Na is ​

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. The ​

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number for Cl is one. ​ ​

Subscript number is 2
so there are 2 atoms of oxygen

​1 capital letter = 1 element

​chemical formula

​Electrically bonded by the electrons.

Labelling

Correctly fill in the blanks with the information provided.

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3 - H P O

hydrogen nitrogen oxygen

H = 3 P = 1 O = 4

2 - Ca Co

2 - N H

H = 1 Cl = 1

2 - Fe S

2 - H Cl

S = 1 O = 3