Midterm Review Flashcards
(29 cards)
Laws
Generalizations about a body of observations which attempts to explain why something is the way it is.
Theories
Broad generalizations that explain a body of facts or phenomena.
How are measurements written?
They are written with significant figures that reflect the accuracy of the instrument used.
What should you remember when diluting acid?
To pour the acid into the water
Reports the amount of uncertainty in a measurement.
Significant figures
I kilounit is equal to
1000 units
1 unit equals
100 centiunits
1000 milliunits
What is cm3 used to measure?
The volume of a SOLID
What is mL used to measure?
The volume of a liquid
What kind of properties can be seen or measured without changing the substance?
Physical
What kind of property requires the substance to be able to change to a new substance?
Chemical
Extensive properties
Change when the amount of the substance changes
Intensive properties
Never change
Ex: density & color
What has one type of atom & is found on the periodic table?
Elements
Two elements BONDED together creating a new substance with new characteristics.
Compounds
Formulas always indicate that the substance is a ___.
Compound
Elements or compounds mixed together but NOT BONDED together.
Mixtures
Their proportions never change.
Compounds
They can NOT be separated by physical methods.
CAN be separated by chemical means.
Compounds
CAN be separated by physical means & keep their original properties. The proportion of the substance can change.
Mixtures
Homogeneous mixture. No visible differences. More difficult to separate.
Solutions
The DIFFERENT substances can be seen. Easy to separate.
Heterogeneous Mixture
What are to the left of the staircase on the periodic table?
Metals
Usually silvery colored, have a high luster, malleable, ductile, good conductor of heat & electricity, high melting point, solids at room temperature (except mercury)
Metals
