1 - The Nature of Chemistry

1 - The Nature of Chemistry - Chapter 1: The Nature of...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 1: The Nature of Chemistry 1.1 Why Care About Chemistry? Chemistry is the science of matter and its transformations from one form to another Matter is anything that has mass and occupies space 1.2 Molecular Medicine 1.3 How Science Is Done hypothesis is an idea that is tentatively proposed as an explanation for some observation and provides a basis for experimentation qualitative does not involve numeric data quantitative information is obtained from measurements that produce numeric data law is a statement that summarizes and explains a wide range of experimental results and has not been contradicted by experiments; can predict unknown results and can be disproved or falsified by new experiments theory is a successful hypothesis, a unifying principle that explains facts and the laws based on them; suggests new hypotheses and experiments and can be discarded by experiments model makes a theory more concrete, physical and mathematical form 1.4 Identifying Matter: Physical Properties substance is a type of matter that has the same properties and the same composition throughout a sample; characteristic properties that are different from the properties of any other substance physical properties are properties that can be observed and measured without changing the composition of a substance; i.e., temperature, pressure, mass, volume, state (gas, liquid, solid), melting and boiling point, density, color, shape, brittleness, hardness, etc. Physical Change o physical changes are changes in the physical properties of a substance; same substance is present before and after physical change but the physical state or size may have changed; i.e., temperature or pressure changes, mechanical manipulated Melting and Boiling Point o measuring melting point and boiling point are useful ways to identify a substance o melting and boiling points are always the same for a single substance but changes if there are more than two substances in a mixture o melting points of pure substances are sharp – there is almost no change in temperature as substance melts o in mixtures, temperature when liquid first appears can be different from temperature when last solid is gone o temperature (T) is property of matter that determines whether there can be heat energy transfer from one object to another o energy always transfers by itself from higher to cooler temperature
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 4

1 - The Nature of Chemistry - Chapter 1: The Nature of...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online