Chem 110 Lecture test 1.txt
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Chem 110 Lecture test 1.txt
Chem Lecture Test
Chemistry Lecture Test 110
The Study of matter and its changes.
Define Scientific Method.
Steps in solving a problem following steps. 1. COllect data 2. Formulate Hypothesis 3. Plan experiments to test hypothesis 4. Modify hypothesis
is a tentative explanation of certain facts. An educated guess.
A well establish hypothesis.
Define Scientific laws.
Are simple statements of natural phenomena to which no exceptions are known under the given conditions.
Anything that has mass
A definite shape and volume, with particles that cling toghether
Solids that has no definate shape
They have a volume but definete shape
THey have indefinite volume and no fixed shape
A specific type of matter with a fix composition
A subtance that has the same properties throughout
A subtance that has two or more disticnt phases
ia a homogeneous past of a system seperated by physical bounderies.
The body of matter under consederation.
is a material containing two or more substances can be heterogeneous or homogeneous.
What is Sceintific Notion?
To write a number between 1 to 10 multiplied by 10 raised to some power. Moved right give a negative exponent. Moved to left five a positive exponent.
What is a measurement?
A quantitive observation
Define significant figures
Digits used to express a measurement
Equation to convert Fahrenheit to Celsius
Equation to convert Celsius to Fahrenheit
F=(1.8 x C) + 32
Equation to convert Celsius to Kalvin
K= C+ 273.15
Define Rounding off numbers?
Rounding a number up or down depending wheather a number is higher or lower than 5
Define Metric System
A measuring system based on the standard of 10 units
Anything that occupies space
The effect of gravity on an object
The standard measurement of the metric system (equal to 1000g)
The amount of space occuppied by matter
One cubic Decimiter
A measure of the intensity of thermal energy, or how hot a system is, regarless of size
Define Specific Gravity
Specific Gravity= Jesity of a liquid or solid/ density of water (The ration of density of anohter subtance)
Elementary subtance that cannot be broken down by chemical means to a smaller substance
The smallest particle that an element can exist.
Abbreviations of elements
Elements that has similar of chemical properties
Define Noble Gases
Gasses and nonreactive
Define Alkali metals
Alkaline Earth Metals
Solids at room temperature. They have high luster, good conductors of electricity and heat. Can be malleable
Have low melting point and density, poor conductors,
Elements have properties that are intermidiate between metals and nonmetals
Molecutes that always excist with two atoms
What are the Diatomic Molecules
Hydrogen, Nitrogen, Oxygen, Fluorine, Chlorine, Bromine, Iodine
A distinct Substance that contains two or more elements chemical bound
Is the smallest uncharge individual unit of a compound formed by the union of tow or more atoms
A positive or negative charge atom
A positive charge atom
Negative charge atom
Define Chemical Formula
Shows the symbal sand the ratio of the atoms in a compound
Numbers that appear below the line of a symbal