38 terms

Chemistry Chapter 1

What is Matter?
anything with mass that takes up space
What is substance?
a specific type of pure matter
What are physical properties?
a character of a substance that can be observed without change
What are chemical properties?
a characteristic that describes its ability to change
Examples of physical properties:
able to melt, able to be broken into smaller parts
Examples of chemical properties:
can burn, can dissolve solids
What is matter made of?
different elements
What are elements?
a substance that cannot be broken down into and other substances by chemical or physical means
What are atoms?
a basic particle from which all elements are made of
What are the three main parts of an atom?
Protons, electrons, nucleus
What is a chemical bond?
a force of attraction between two atoms
What is a molecule?
a group of two or more atoms
What is a compound ?
a substance made of two or more elements
What are mixtures?
a mixture made of two or more substances that are together in the same place but not chemically bonded
What is a heterogeneous mixture?
a mixture where you can see the separate substances and is easily separated
What does hetero mean?
What is a homogeneous mixture?
two substances have chemically bonded and you cannot see the different parts of the mixture
What does homo mean?
Why is separating mixtures possible?
because substances in mixtures keep there properties
What are the four methods of separation?
distillation, evaporation, filtration, magnetic attraction
What is weight?
the measure of force of gravity on you or the object
What is the formula to find the weight of something?
What is mass?
amount the matter in an object
What is the SI unit for mass?
What is volume?
the amount of space matter occupies per cm cubed
How is volume measured?
LengthXwidthXheight or by putting an object in a container of water and see how much the water rises.
What is density?
Measure of mass of a material in a given object
What is the formula for density?
Mass divided by volume
What does a physical change do to an object?
it changes it's appearance
What are the three states of matter?
solid, liquid, gas
What does a chemical change do to an object?
its transforms one substance into another
What is the Law of Conservation of Matter?
matter is not created nor destroyed in a chemical change
What is the Law of Conservation of Energy?
energy is not created nor destroyed, it just changes form
What is temperature?
how hot or cold something is
What is thermal energy?
total energy of the motion of all of the particles in an object
What is Endothermic?
What is exothermic change?
What is Chemical energy?
the energy stored in the chemical bonds between atoms