What’s the “matter”?

What’s the matter? EVERYTHING! The stuff that makes up

the world is called matter. The smallest unit of matter

is the atom. There are currently 110

different types of atoms and an INFINITE amount of ways to combine these atoms.

http://www.csmate.colostate.edu/cltw/cohortpages/viney/atomhistory.html

Classifying matter:

1. Pure Substance: one kind of element or compound.1. Element- one type of

atom, there are 110 known elements.

2. Compound-two or more types of atoms, chemically combined.

molecule: the smallest unit of an element or compound.

Classify me:

Element-molecule of N2

Compound-molecule of CO2 Element-

molecule of He AKA an atom of He

Element-molecule of H2

Compound-molecule of methane gas, CH4

Elements-molecules of the atoms Ar, Ne, Kr, and Xe

Element-molecule of O2

2. Mixtures: two or more pure substances mixed together. Homogeneous mixtures: the substances

are mixed evenly. The different substances that make up the mixture cannot been seen separately without first using a separation technique. i.e. syrup, air, gasoline.

Heterogeneous mixtures: the substances are not mixed evenly and can be seen as separate parts i.e. Italian dressing, concrete.

Quick lab: Take the paper, choose a marker, and make a

nice, small, solid design about one half inch from the bottom of the paper.

Place the paper into the beaker of water so that it is standing in the water with the color near closer to the water than to the top of the beaker.

Let the paper sit in the water while we continue to take notes.

2. Mixtures: two or more pure substances mixed together.

Mixture1. Reflects the properties of

the substances it contains.

2. Elements are physically mixed together.

3. A mixtures can be made with different proportions of ingredients.

Compound1. Has properties unique to

the compound, and often different than the properties of the elements that make up the compound.

2. Elements are chemical bonded together.

3. A compound is always made up of the same ratio of elements.

2. Mixtures: two or more pure substances mixed together.

A major task in chemistry is the separation of mixtures. Filtration Chromatography Magnetism Distillation Refining

Quick lab: Chromatography Look at your mark. The dye in the marker is actually a __________

mixture of different dyes. Why is this not a compound? The liquid carried the different dyes different

distances on the paper, allowing us to separate the mixture-this is called chromatography.

What color of dyes make up the mixture for that specific marker?

What other questions could you test this way?

Homogeneous

Any questions?

Homework:1. What is the difference between an element and

compound? How are they similar?

2. What is the difference between a compound and a mixture? How are they similar?

3. Research Alkali Metals, tell me three properties that all Alkali Metals have in common.