Chemie 2 Matter and Change
2.1 /2.2/2.3 /2.4
2.1 /2.2/2.3 /2.4
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Name the two classifications of substances.
- elements
- compound (Verbindungen)
Elements can be easily separated into simpler substances
Compounds are substances that can be separated into simpler substances only by C means.
chemical
The properties of compounds are diffrent from those of their compent elements
Sodium chloride (table salt) is a C of ssodium, which is a soft M, and chlorine, which is a pale yellow G
C - compound
M - Metal
G - Gas
Describe one way to decide wheter a sample of matter is a substace or a mixture.
Substance: composition is fixed (zusammensetzung immer gleich)
mixture: composition may vary (zusammensetzung kann ändern)
Complete the labels in the diagram.
Bild
What is used to represent an element?
A one or two letter chemical symbol.
What are chemical symbols used for?
Are used to write the chemical formulas of compounds.
Subscripts in chemical formulas are used to indicate the R of the elements in the compound.
R - relative number (zeigt Verhältnis der Elemte an)
The elements that make up a compound are always present in the same proportions.
Pb is the symbol for what element?
What is the symbol for gold?
Stibium is the Latin name for which element?
1. Lead, Blei
2. Au
3. Autimony
What is a chemical property?
Is the ability of a substance to undergo a spezific chemical change.
Fähigkeit einer chemischen Substanz Reaktion auszulösen.
Chemical properties are observed only when a substance undergoes a chemical change.
What happens during a chemical reaction?
One or more substance change into one or more new substance.
A change in the composition of matter ...... occurs during a chemical reaction
Which of the following terms completes the sentence best?
List the four possible clues to a chemical change.
1. transfer of energy
2. changes of colour
3. production of glas
4. a solid forms out of a liquid
If you observe a clue for chemical change, you can be certain that a chemical change has taken place.
During a chemical reaction, the mass of the products is always equal to the mass of the ....
initiation substances
The law of conservation of mass sates that in any physical change or chemical reaction, mass is neither C nor D.
C - created
D - destroyed
The M of a object is a mesure of the amount of matter the object contains
Mass
Matter that has a uniform and definite composition is called
substance
all samples of a substanve 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 observed
M measured
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?
complete the table about properties of three states of matter
solid liquid gaseous
Shape
volume
can be compressed.
solid liquid gaseous
Shape definte (does not changes) indefinite indefinite
volume definte definite indefinite
can be compressed..... not easily not easily easily
Match each arrangement of the particles in Matter with a physical state
- close,but free to flow
- spaced relatively far apart
- packed tightly together
- close,but free to flow - (fast) liquid
- spaced relatively far apart - (very fast) gas
- packed tightly together- (very slow) solid
The term gas is limited to those substance that exist in the gaseous state at.....
room temperature (20 Grad)
The word gas and vapour can be used interchangeably
A physical change alters a given material without changing its chemical...
composition
Physical changes that involve a change of state are always reversible
Most samples of matter are mixtures
What is a mixture?
A physical blend of two or more componets- most samples of matter are mixture
A heterogeneous mixture is one that has a completely uniform composition
Which term describes a part of a sample with uniform composition and properties?
How many phases exist in these types of mixture?
homogenous
heterogenous
homogenous - one
heterogenous - two or more
The process that separates a solid from a liquid in a heterogeneous mixture is called?
Filtration
What happens during a distillation?
A liquid is boiled to produce a vapor that is then condensed into a liquid.
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Cartes-fiches
During a chemical reaction, the mass of the products is always equal to the mass of the ....
initiation substances
The law of conservation of mass sates that in any physical change or chemical reaction, mass is neither C nor D.
C - created
D - destroyed
