Describe four physical differences between the dogs.

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Describe four physical differences between the dogs.

Transcript of Describe four physical differences between the dogs.

Describe four physical differences between the dogs.

Physical Property: A characteristic of a substance that can be observed without changing it into another substance.

Chemical Property: A characteristic of a substance that describes its ability to CHANGE into different substances.

Examples: color, melting point, flexibility

Examples: combustion, rust, chemical weathering (acid rain)

Physical Properties of Minerals

Hardness: Moh’s Scale of Hardness p. 106

Luster: Metallic or Non-Metallic?

Glassy, greasy, opaque…

Color: Least reliable

Color

CleavageCubic

Octahedron

Streak

CaCO3 + HCl ==> CaCl2 + CO2 

Calcium Carbonate + Hydrochloric acid YIELDS Calcium chloride and Carbon dioxide 

Effervescence

Chemical Formulas

H20Hydrogen Oxygen

Subscript: shows the number of atoms of the atom to the left. (2 hydrogen, 1 oxygen)

*subscript of “1” is not written in chemical formulas

Examples

1. NaCl =

2. CO2 =

3. H2SO4 =

4. O2 =

5. Fe2O3 =

6. H3PO4 =

1 sodium (Na), 1 chlorine (Cl) Salt

1 carbon (C), 2 oxygen (O)

2 hydrogen (H), 1 sulfer (S), 4 Oxygen (O)

2 oxygen (O)

2 iron (Fe), 3 oxygen (O)

3 hydrogen (H), 1 phosphorous (P), 4 oxygen (O)

Carbon dioxide

Hematite, Rust