Matter and Energy

By: Kyla, Mauri, and Nicole

Metals, Nonmetals, and Metalloids

Three main element groups:

1. Metal

2. Nonmetal

3. Matalloids

Physical Properties:

Metals- Good electrical and heat conductors, malleable, ductile, solid at room temperature.

Nonmetals- poor conductors of heat and electricity, non-ductile brittle, solids liquids or gases at room temperature.

Metalloids- Shiny or dull, conductivity of heat and electricity, solid at room temperature, ductile, and malleable.

Density

Definition: The degree of compactness of a substance

Density Formula= m/v

~It's not the weight of the object, but it's the density that determines whether an object will sink or float in water.

Example: Mass is 55 grams and volume is 5 cubic centimeters. Density= 11 grams

Minerals

Definition: A solid inorganic substance of natural occurrence.

Physical Properties: luster, color, streak, cleavage, and hardness= identify minerals.

How To Test

Hardness: by seeing how easy it is to scratch a mineral.

Color: look at the color of the streak.

Luster: how it reflects light and can be metallic, pearly, glassy, silky, or dull.

Streak: rub the mineral across a piece of tile.

Facts:

The hardest mineral known is the diamond.

The streak is more reliable than looking at the mineral because the outside of a rock can look different than the streak.