Chemie TBZ 1. Lehrjahr
Chapter 1,2 and 3
Chapter 1,2 and 3
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Flashcards
What is matter?
Materie hat eine Masse und braucht Platz
What is chemistry?
Chemie ist die Wissenschaft der Materie und Veränderungen, die mit der Materie passieren.
What are the five major areas of chemistry?
organic chemistry
biochemistry
physical chemistry
inorganic chemistry
analytical chemistry
The boundaries between the five areas of chemistry are not firm.
Explain why air is classified as matter.
It has a mass and occupies space. It is just invisible matter.
The Japanese characters for chemistry literally mean
»change study«. Why are these appropriate characters to
represent chemistry?
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Chemistry concerns the changes that matter undergoes.
Describe the main difference between inorganic chemistry and organic chemistry
inoriganic: does not contain carbon
organic: does contain carbon (=Kohlenstoff)
Chemists design materials to fit general needs
In George de Mestral’s hook-and-loop tapes, were the hooks macroscopic or
microscopic?
List two ways to meet the demand for energy
conserve engergy
producing energy
How does insulation help conserve energy?
Insulation acts as a barrier to heat flow
How are soybeans used as a source of energy?
Soybean plants can be used to make biodiesel.
Which statement is true about batteries?
What is pollutant?
= Schadstoff
A material that is harmful to living organisms.
How can scientists study the composition of distant stars?
By analyzing the light they tansmit to earth.
(Analyse des Lichtspektrums)
What did chemists learn about the moons surface by analyzing moon rocks?
he learned tha oceans of lava once convered the moons surface.
Why won’t the method used to discover the chemical composition of stars work for the
moon and planets?
The moon and the planets do not emit light.
Use an example to compare and contrast the terms macroscopic and microscopic.
macroscopic : skin (Haut) / (Kies, keine Steine )
microscopic : cell ( Zelle ) / fine dust ( Feinstaub)
Practical alchemy focused on...
Practical alchemy focused on developing techniques for working with metals, glass and dynes ( Farbstoffen).
Alchemists developed processes for separating M and purifying chemicals
M = mixtures (Mischungen)
How did Lavoisier help to transform chemistry?
He demontrated the importance of measurement.
Which of the following is necessary for materials to burn?
What is the scientific method?
It is a logical, systematic approach to the solution of a scientific problem.
A scientific problem is often discovered when an O is made, which leads to a question.
O = observation
A H is formed when an explanation is proposed for an observation.
H = hypothesis (Vermutung)
Testing a proposed explanation requires designing an E.
E= experiment
An explanation may become a T if the same results are found after many test
T= theory
Which activity uses the senses to gather information directly?
What do scientists do if the results of an experiment do not support the hypothesis?
They develop a new hypothesis and perform experiments to test the new hypothesis.
Perhaps a theory needs to be changed at some point in the future to explain new
observations or experimental results.
What is scientific law?
A scientific law is an esact statement that summarizes the results of many observations and experiments.(=Formel, Gesetz)
What is the purpose of an experiment?
To test a hypothesis.
Which of the following is not a part of the scientific method?
The M of an object is a measure of the amount of matter the object contains.
Mass
Matter that has a uniform and definite composition is called a …
substance (reiner Stoff)
All samples of a substance have different physical properties
A physical property is a quality or condition of a substance that can be O or M without changing the substance’s composition.
O = oberved (beobachten) M= measured (messen)
Which term is NOT a physical property?
»Physical properties can help a chemist identify a substance.«
Which term is NOT a physical state of matter?
