Chemistry Unit 2
Terms in this set (26)
anything that has mass and takes up space
tiny particles that matter is composed of
one of the more than 100 "building blocks" of which matter is composed
a substance composed of two or more elements that are bonded together
made up of atoms that are connected by chemical bonds (stuck together)
a combination of 2 or more pure substances in which each pure substance keeps its individual chemical properties.
cannot be separated into simpler substances by physical or mechanical means.
mixture of two or more substances and you can see what is inside of it.
mixture that has two or more substances in it, but you cannot see them.
mixture of metals
rigid, has a fixed shape and volume, and particles are held together in a definite arrangement, particles vibrates in a fixed position.
No fixed volume or shape, uniformly fill any container, particles are far apart, moving at high speeds.
fixed volume but it takes the shape of its container, particles packed closely together and move rapidly enough to slide over each other (allows them to easily be poured)
a characteristic of an object that can be observed or measured that does not change the identity of the substance
a pure substance's ability to react under certain conditions in order to form a new substance or substances
used to separate components of a liquid mixture. It is based on boiling points of each liquid - the liquid with the lowest boiling point can be boiled out of solution.
uses a filter to separate a sold from a liquid. It allows liquid to pass through and it leaves the sold behind
used to seperate the colors out of dyes
used to separate solute from solution (ex: separate salt from water)
change in the appearance or state of a substance that does not change what it is
a chemical reaction takes place where a substance changes into a different substance producing a new substance.
A physical change involves a change in one or more physical properties, but no change in the fundamental components that make up the substance.
A chemical change involves a change in the fundamental components of the substance; a given substance changes into a different substance or substances.
Are all physical changes accompanied by chemical changes? Are all chemical changes accompanied by physical changes? Explain.
No, physical changes are not necessarily accompanied by chemical changes. However, chemical changes are always accompanied by physical changes.
Pure substances are elements and compounds.
Can an element be broken down into simpler substances? why or why not?
No, an element cannot be broken down into simpler substances. It cannot be broken down any further because it is already in the simplest form of matter. Plus, matter cannot be created or destroyed.
Why can a mixture be broken down into its seperate components?
It can be separated into its separate components because the components in a mixture are only physically intermingled, not chemically combined. Each of the components in a mixture keep their own identities, therefore can be physically separated.