CPC 2.3 Elements and Compound

A mixture of different substances

A pure substance that cannot be separated into simpler substances by physical or chemical means

A compound that can be broken down into simpler substances

A solution of various chemicals

around 50

around 10

around 100

around 500

A unique charge

A unique symbol

A unique physical state

A unique color

Because it organizes elements by their atomic number

Because it arranges elements in alphabetical order

Because the pattern of similar properties repeats from period to period

Because it groups elements by their color

They have the same atomic number

They have similar chemical and physical properties

They have the same number of protons

They have the same color

Periods

Rows

Groups

Sections

Families

Groups

Families

Periods

Sections

One element

Two or more different elements

Three or more identical elements

Two or more different molecules

Randomly

In a fixed ratio

In a variable ratio

By physical means

Elements

Atoms

Compounds

Mixtures

Oxygen (O₂)

Hydrogen (H₂)

Table salt (NaCl)

Helium (He)

Water (H₂O)

Carbon dioxide (CO₂)

Sodium (Na)

Table salt (NaCl)

External energy, such as heat or electricity

Internal energy, such as friction

Tools, such as a graduated cylinder or filter

a magnet

Physical means

Chemical means

Mechanical means

Biological means

Combustion

Electrolysis

Filtration

Distillation

Hydrogen and Carbon

Oxygen and Nitrogen

Hydrogen and Oxygen

Carbon and Oxygen

Yes, it applies regardless of the sample size.

No, it only applies to large samples.

No, it only applies to small samples.

Yes, but only if the samples are of the same size.

The elements in a compound can vary in proportion by mass.

The elements in a compound are always in the same proportion by mass.

The elements in a compound can vary in proportion by volume.

The elements in a compound are always in the same proportion by volume.

(mass of element / mass of compound) × 100

(mass of compound / mass of element) × 100

(mass of element + mass of compound) × 100

(mass of element - mass of compound) × 100

They vary depending on the sample amount.

They remain the same despite differences in sample amount.

They change with temperature.

They depend on the method of extraction.

6.50%

51.30%

42.20%

20.00%

42.20%

6.50%

51.30%

20.00%

Hydrogen and Oxygen

Hydrogen and Nitrogen

Oxygen and Carbon

Carbon and Hydrogen

2:1

1:1

3:1

1:2

The mass of hydrogen

The mass of oxygen

The number of elements

The chemical formula

All elements are naturally existing.

An element cannot be separated into simpler substances by physical or chemical means.

Water is an element.

Different sets of elements share similar physical properties, but they never share chemical properties.

They are not organized in any particular pattern.

They are organized alphabetically by their chemical symbols.

They are organized into horizontal rows called periods and vertical columns called groups.

They are organized into horizontal rows called groups and vertical columns called periods.

water

potassium iodide

sodium chloride

hydrogen

It separates water into one part hydrogen and one part oxygen.

It causes the physical change of water into its component elements.

It uses heat to break down a compound.

It causes the chemical change of water into its component elements.

the law of conservation of mass

the periodic law

the law of multiple proportions

the law of definite proportions