chem unit 1

a change of materials into another, new materials with different properties and one or more than one new substances are formed. It results when a substance combines with another to form a new substance

Physical changes are those in which the shape, size, or state of the matter changes, but the substance is still essentially the same. For example, chopping up a carrot or ice melting into water are both physical changes.

In a physical change the appearance or form of the matter changes but the kind of matter in the substance does not. However in a chemical change, the kind of matter changes and at least one new substance with new properties is formed.

In a physical change the appearance or form of the matter changes but the kind of matter in the substance does not. However in a chemical change, the kind of matter changes and at least one new substance with new properties is formed.

A physical property is a characteristic of a substance that can be observed or measured without changing the identity of the substance

A physical property is a characteristic of a substance that can be observed or measured without changing the identity of the substance. Physical properties include color, density, hardness, and melting and boiling points. A chemical property describes the ability of a substance to undergo a specific chemical change

a physical property of a system that does not depend on the system size or the amount of material in the system.

a property that depends on the amount of matter in a sample. Mass and volume are examples of extensive properties.

Metals: Most metals have a shiny metallic luster and reflective surface. Nonmetals: Nonmetals are generally dull or nonreflective and do not have a metallic luster. Metalloids: Metalloids can have a metallic or nonmetallic appearance, depending on the element

An element is a pure substance which contains identical atoms or molecules with only one type of atomic core. A compound is a pure substance which contains identical molecules with two or more types of atomic core. A mixture is a material which has two or more types of molecules.

a homogeneous mixture is one in which different parts (such as salt and water) have been uniformly combined into a new substance (salt water), while a heterogeneous mixture has parts that remain separate.

A gaseous chemical element that does not readily enter into chemical combination with other elements. Examples are helium, argon, krypton, xenon, and radon.

A halogen is a chemical element that forms a salt when it reacts with metal. Ex: luorine (F), chlorine (Cl), bromine (Br), iodine (I), astatine (At), and tennessine (Ts)..

The study of matter

Anything that has mass and takes up space

1-Organic 2-Inorganic 3-analytical 4-physical 5-biochemistry 6- theoretical

The study of carbon containing compounds

The study of non-caarbon containing compounds

Analysis of the composition of substances

studying the interaction of matter and energy

Studying the chemistry of living things

Using computer and mathematical models

EVERYWHERE

Extensive property- Depends on the amt of substance (ex. volume, mass)
Intensice property- Does not depend on the amt of substance (ex. color, temp)
Physical property- can be observed without changing the identity of the substance (ex. ph, color, mass)
Chemical property- can only be observed by changing the identity of the substance (ex. flammabilty, reactivity)

Physical changes; DO NOT altar the identity of the substance (ex. tearing, griding, crumbling)

Solid; definite shape and volume
Liquid; definite volume, indefinite shape
Gas; indefinite volume and shape

Do altar the identity of the substance (chemical reactions)

COMPOUND

Metals

Nonmetals

Metalloids

Energy is given off: Exothermic
Energy is taken in : Endothermic