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Chem 104 Unit EXAM/84 Complete Questions and Answers A+ Graded
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Chem 104 Unit EXAM/84 CompleteQuestions and Answers A+
Graded
Science - -A way of learning about the natural world
-Describe the Nature of Science - -Began when people became skeptical
Revising ideas
-Scientific Method - -A series of steps followed to solve problems including
collecting data, formulating a hypothesis, testing the hypothesis, and stating
conclusions.
-1.3 Technology - -Is Applied Science
Can be helpful and harmful
*fossil fuels have helped us and also hurt us.
The development of solar and E-books Help reduce the fuels.
-1.4 Distinguish between scientific facts, hypotheses, laws and theories - -
*Scientific fact- When something is agreed upon by competent observers s
being true
*Scientific Hypotheses- When it can be tested through experiments.
*Laws-When a hypotheses has been tested and supported by experimental
data over and over again and has not been contradicted, it becomes the
LAW.
*Theories-Is a well tested explanation that unifies a broad range of
observations within the natural world.
-1.5 Describe chemistry as a central science with an emphasis in applied
research. - -Chemistry is often described as a central science because it
touches all the other science. It is the foundation for earth science and space
science. Applied research in chemistry has provided us with medicine, food,
water and shelter
-1.6 Scientist measure physical quantities - -Length, Time, Mass, Weight,
Volume, Temp, Heat and Density. A number must always include a unit.
* My dog weighs 40.. 40 what? you must state, My dog weighs 40lbs or kg.
-states of matter - -the physical forms of matter, which include solid, liquid,
and gas
-Names and Abbreviations for the metric (si) units used in measurements of
length, volume and mass - -Length- *Kilometer(km)
, *Meter(m)
*Centimeter(cm)
*Millimeter(mm)
Volume- *Liter(L)
*Milliliter(ml)
*Cubic centimeter(cm^3)
Mass- Kilogram(kg)
& Gram(G)
& Milligram(mg)
-Determine the number of scientific figures in measured numbers. Scientific
notation. - -In the number 0.004205 (which may be written as 4.205 x 10-3),
the '5' is the least significant figure. In the number 43.120 (which may be
written as 4.3210 x 101), the '0' is the least significant figure.
-numerical value, symbol and prefix for metric units - -Tera(T)- 1
Terameter(Tm)= 1 trillion meters
Giga(G)- 1 Gigameter(Gm)= 1 billion meters
Mega(M)- 1 Megameter(Mm)= 1 million meters
Kilo(k)- 1 Kilometer(km)= 1 thousand meters
Hecto(h)- 1 Hectometer= 1 hundred meters
Deka(da)- 1 Dekameter(dam)= 10 meters
No Prefix- 1 Meter(m)= 1 meter
Deci(d)- 1 Decimeter(dm)= 1 tenth of a meter
Centi(c)- 1 centimeter(cm)= 1 hundredth of a meter
Milli(m)- 1 millimeter(mm)= 1 thousandths of a meter
Micro()- 1 micrometer(_m)= 1 millionth of a meter
Nano(n)- 1 nanometer(nm)= 1 billionth of a meter
Pico(p)- 1 picometer(pm)= 1 trillionth of a meter
-applied vs. basic research - -- applied: used to solve a particular problem
- basic: used to explore fundamental aspects of behavior without regard to
any real-world issues; knowledge for knowledge base.
-Chemistry in our lives - -Is everything. Wondering what things are made of
or how puddles dry up, a car using gasoline. Chemistry touches all science.
-Matter - -anything that takes up space and has mass
-Nanotechnology - -The science and technology of building devices, such as
electronic circuits, from single atoms and molecules.
-Science - -A way of learning about the natural world
-scientific hypothesis - -a possible and testable answer to a scientific
question or explanation of what scientists observe in nature
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