1st Qtr Flashcards
conclusion reached on the basis of evidence and reasoning
inference
OCIC
observing, classifying, inferencing, and communicating (4 science process skills)
A variable that intentionally changed in an expirement.
independent variable
A variable that may change as a result of changes made in the independent variable
dependent variable
A variable that the research has constant control over.
controlled variable
What is the purpose of the scientific method?
It is a way of solving problems
What are the factors in an experiment that can be changed?
variables
ITP, FH,TTH, GAPD, AD, DC
identifying the problem, formulating hypothesis, testing the hypothesis, gathering and presenting data, analysing data, and drawing conclusions (6 steps in the scientific method)
Forms of matter that have a definite and unchanging chemical composition.Ex: salt, baking soda, water
pure substances
simplest form of matter made with 1 kind of atom and cannot be changed into another form of matter by ordinary means.
element
how many elements are there?
118 elements in total
Good Conductors of heat and electricity. Are hard, shiny solids.They are malleable so they can stretch and shaped.
metals
Poor conductors of heat and electricity.They are neither malleable nor ductile.
non-metals
a substance consisting of atoms or ions of two or more elements that are chemically bonded together ex: paper, nail polish, candle
compound
A type of compound that contains carbon, usually bonded to hydrogen. Ex: DNA, Sugar
organic compounds
A type of compound that usually doesn’t contain carbon and includes carbon dioxide and some carbohydrates, cyanides, and carbides.
inorganic compounds
Made up of two or more substances that are physically combined and has 2 types.
mixtures
It is only have one phase.
It has the same properties and composition. Ex: milk, honey, medicine, tea
homogenous mixture
It is made up of more than one phase. Different components are visibly distinguishable from one another. Ex: ice cream with toppings, salad
heterogenous mixture
a homogenous mixture of two or more substances in relative amounts that can be varied continuously up to what is called the limit of solubility.
solution
a heterogenous mixture in which particles of a material are dispersed throughout a liquid or gas but large enough settle out.
suspension
a heterogenous mixture of two or more substances mixed together but not chemically combined (they can be separated).
colloid
takes advantage of the physical property of magnetism.(often by hand) takes advantage of physical properties such as color and shape.
Magnetic sepertaion
takes advantage of the physical property of the stateofmatter. A screen lets the liquid particles through,but traps the solid particles.
filtration
can be used to separate solid particles of different sizes.
filter
The separation o fa mixture of liquids based on the physical property of boiling point.
distillation
Vaporizing a liquid and leaving the dissolved solid(s)behind. Used to separate salt solutions.
evaporation
Uses the property of molecular attraction (molecular polarity) to separate a mixture.
paper chromatography
Dissolved substances crystalize out of a solution once their solubility limit is reached as the solution cools.
Fractional Crystallization:
Temperature at which a liquid starts to boil
boiling point
Temperature at which a solid start to melt
melting point
Temperature at which a liquid changes to a solid
freezing point
