What is chemistry????

Varies dependent on gravity Chemistry- the science that investigates and explains the structure and properties of matter Matter is anything that has mass and volume. Mass is the amount of matter Volume is the amount of space an object occupies. MASS  WEIGHT Mass Weight Constant Varies dependent on gravity Measured on a balance Measured on a scale

E = mc2 Can this law be broken???? LAW OF CONSERVATION OF MASS (Lavoisier)- Matter (Mass) can not be created nor destroyed; just changed/transformed. Can this law be broken???? E = mc2 Matter exists in 6 phases. Bose-Einstein Condensate Solid* Liquid* Aqueous* (dissolved in water) Gas* Plasma Neutron star

A solid is matter with a fixed volume and shape that does not change much with temperature. Atoms and molecules are held tightly in a rigid structure. A liquid has a fixed volume but NOT a fixed shape. It conforms to the shape of the container. Its volume changes somewhat with changes in temperature. The particles in a liquid are not held together in a rigid manner; they can slip past one another. A gas has neither a fixed shape nor fixed volume. It expands to fill its container completely; its volume is very sensitive to temperature and pressure. A gas’ particles are not held to one another

Matter can be characterized according to its properties (characteristics), which can be either physical or chemical. Physical properties can be measured and observed without changing the substance. Examples: color, texture, shape, odor, phase, length, mass Chemical properties are properties that are measured when a substance interacts when in contact with other materials Examples: flammability, reactivity

When we examine matter we make observations. Observation vs. Inference An observation is made using your senses. (sight, hearing, touch, etc.) You gather facts about something. An inference is similar to a conclusion. It is a prediction. Example: When piece of paper burns, it releases a visible gas. The gas is smoke, a mixture of carbon dioxide and water. Observation Inference

Observations can be of two types: Qualitative and Quantitative A quantitative observation is one that involves numerical data. (quantity means amount = number)   A qualitative observation does not. Chemistry involves both qualitative and quantitative observations.   Quantitative observations are more exact than qualitative. We will focus on quantitative observations.

Classify the following as either quantitative or qualitative observations. My eyes are brown The most popular color for a new car in 2000 was silver   My neck size is 17 inches My average grade last year was 84%   Physics is a difficult subject