L1: Elements, Compounds & Mixtures Flashcards
“A property that changes when the size of the sample changes”
A) Intensive
B) Extensive
C) Chemical
D) Physical
B) Extensive
A property that doesn’t change when you add or take away from the sample
A) Intensive
B) Extensive
C) Chemical
D) Physical
A) Intensive
Extensive or intensive?
Electrical conductivity
Intensive
Extensive or intensive?
Temperature
Intensive
Extensive or intensive?
Hardness
Intensive
Extensive or intensive?
Mass
Extensive
Extensive or intensive?
Molecular weight
Intensive
Extensive or intensive?
Volume
Extensive
Extensive or intensive?
Density
Intensive
Extensive or intensive?
Colour
Intensive
Extensive or intensive?
Length
Extensive
Extensive or intensive?
Melting point
Intensive
“A property that can be observed or measured without altering the chemical identity of the sample”
A) Intensive
B) Extensive
C) Chemical
D) Physical
D) Physical
“A property that can only be observed or measured by altering the chemical identity of the sample”
A) Intensive
B) Extensive
C) Chemical
D) Physical
C) Chemical
Physical or chemical?
Colour
Physical
Physical or chemical?
Molecular weight
Physical
Physical or chemical?
Reactivity
Chemical
Physical or chemical?
Flammability
Chemical
Physical or chemical?
Oxidation states
Chemical
Physical or chemical?
Volume
Chemical
Which of the following properties are most useful in chemical identification?
A) Intensive
B) Extensive
C) Chemical
D) Physical
A) Intensive
What is the term to describe “anything that has mass”?
Matter
Which type of property arises from the distribution of valence electrons?
A) Intensive
B) Extensive
C) Chemical
D) Physical
C) Chemical
True or false: compounds are examples of pure substances
True
What is Dalton’s atomic theory? (4 points)
1) All matter is made of atoms. Atoms are indivisible and indestructible
2) All atoms of a given element are identical in mass and properties
3) Compounds are formed by a combination of two or more different kinds of atoms
4) A chemical reaction is a rearrangement of atoms
True or false: valency and combining power are essentially the same thing?
True
What particles are found in the nucleus of an atom?
Protons and neutrons
What is the formula for relative atomic mass?
Ar = Mass of 1 atom of element / one-twelfth the mass of 1 carbon-12 atom
What is the formula for relative molecular mass?
Mr = Mass of 1 molecule of substance / one-twelfth the mass of 1 carbon-12 atom
How do you calculate the relative molecular mass of a known substance?
Add up the relative atomic masses of the constituent atoms
What is a homogenous mixture?
A mixture with uniform appearance and properties (e.g. solution)
What is a heterogeneous mixture?
A mixture with varying properties and a non-uniform appearance
True or false: making a solution requires a solvent and a solute
True
Give 6 methods of separating mixtures
1) Filtration
2) Crystallization
3) Extraction
4) Distillation
5) Magnetisation
6) Chromatography
A substance that has uniform properties, a fixed composition, and is chemically decomposable is:
A) an element
B) a compound
C) a heterogenous mixture
D) a homogenous mixture
B) a compound
A substance with non-uniform properties is:
A) an element
B) a compound
C) a heterogenous mixture
D) a homogenous mixture
C) a heterogenous mixture
A substance with uniform properties, fixed composition, but is not chemically decomposable is:
A) an element
B) a compound
C) a heterogenous mixture
D) a homogenous mixture
A) an element
A substance that has uniform properties, but not fixed composition is:
A) an element
B) a compound
C) a heterogenous mixture
D) a homogenous mixture
D) a homogenous mixture
