Chem Midterm - Chapters 1-3 Vocabulary

A systematic approach and organized process used in scientific study to do research. It allows scientists to verify the works of others

A tentative explanation for what has been observed in an experiment

A set of controlled observations that test a hypothesis

An explanation of a natural phenomenon based on many observations and investigations

A relationship in nature that is supported by many experiments

The variable that you plan to change in an experiment

The variable that responds to the change in the independent variable

Expressing any number as a number between 1 and 10 multiplied by 10 raised to a power

All known digits plus one estimated digit

How close a measured value is to an accepted value

refers to how close a series of measurements are to one another

All numbers that are known

Proportional reasoning where a given measurement can be multiplied by a known proportion to give a result with a different unit or dimension

A ratio of equivalent values having different units

A compound is always composed of the same elements in the same proportion by mass, no matter how large or small the sample is

A ratio that compares the mass of an object to its volume

A matter that has a definite and uniform composition (also known as a chemical)

Anything that has mass and takes up space

A pure substance that cannot be separated into simpler substances by physical or chemical means

A substance made up of two or more different chemical elements combined in a fixed ratio

A characteristic that can be observed/measured without changing the sample’s composition

A characteristic that is dependent on the amount of a substance present

A characteristic that is independent of the amount of a substance present

The ability of a substance to combine with or change into one or more substances

The classification of all matter that exists naturally

A form of matter that has its own definite shape and volume

A form of matter that flows, ahs constant volume, and takes the shape of its container

A form of matter that not only flows to conform to the shape of its container but also fills the entire volume of its container

A change that alters a substance without changing its composition

A process that involves one or more substances changing into new substances

Mass is neither created nor destroyed during a chemical reaction (it is conserved)