WorksheetsPIA Quiz
Total questions: 50
Worksheet time: 34mins
Have a fixed or definite composition
Mixtures
Homogeneous
Pure Substance
Compound
Contain two or more different substances that are physically mixed but not chemically combined.
Pure Substance
Mixture
Compound
Heterogeneous
is composed of two or more elements and always combined in the same proportion
Compound
Mixture
Homogeneous
Element
the different parts of the mixture are not visible.
Heterogeneous
Compound
Homogeneous
Pure Substance
is composed of one type of atom, cannot be separated into simpler substances by physical or chemical means.
Homogeneous
Element
Compound
Heterogeneous
the different parts of the mixture are visible.
Homogeneous
Heterogeneous
Pure Substance
Element
HETEROGENEOUS MIXTURES SEPARATION METHODS
Distillation
Filtration
Decantation
Comotography
HOMOGENEOUS MIXTURES SEPARATION METHODS
Evaporation
Decantation
Centrifugation
Distillation
Change of state, change in size, or change in shape are examples of:
Physical Changes
Chemical Changes
Three states of matter:
Examples of Physical properties EXCEPT:
Oxidation
Malleability
Density
Weight
Change of state from solid to liquid:
Evaporation
Melting
Freezing
Deposition
Change of state from gas to solid directly:
Sublimination
Freezing
Deposition
Evaporation
Change of state from solid to gas without passing through liquid:
Sublimation
Deposition
Melting
Evaporation
temperature at which a liquid changes to gas.
Freezing
Melting
Boiling
Who created the first atomic model?
Rutherford
Democritus
Jonh Dalton
None
What is the name of Bohr´s atomic model?
Planetary model
Billiard ball model
Plum-pudding model
None
Why does Rutherford´s atomic model was wrong?
Because it stays that it was unstable
Because it didn´t mention the electrons
Because it stays that in the nucleus are electrons and neutrons
None
which one of the following scientists developed the latest atomic model?
Bohr
Schrödinger
Thompson
None
1s22s22p63s2 Determine the element of this electron configuration:
Sulfur
Hydrogen
Magnesium
None
What is the atomic number of Sulfur?
45
17
16
None
What is the noble gas notation of Strontium?
[36Kr] 5s2
[36Kr] 5s2 4d9
[18Ar] 4s2 3d10 4p6
None
The mass number is used to calculate the number of:
Electrons
Neutrons
Protons
None
Are atoms of the same element that have the same atomic number but different number of neutrons
Isotopes
Compounds
elements
None
Which of the following is the chemical symbol and atomic number for Scandium?
Mg z=12
O z=8
Sc z=21
How many elements are known?
75
122
118
Mendeleev organized the elements by increasing atomic masses and left gaps for undiscovered elements.
True
False
How are called the horizontal rows of the periodic table?
a) Families
b) Periods
c) Groups
a and c
How are called the vertical columns that can be numbered from 1 to 18 or with the letters A and B?
a) Families
b) Periods
c) Groups
a and c
How many periods and groups are?
9 periods and 14 groups
8 periods and 9 groups
14 periods and 12 groups
7 periods and 18 groups
How are called the groups 1,2, and 13 to 18?
Representative elements
Transition elements
Noble Gases
Groups 3 to 12 are referred to as?
Representative elements
Transition elements
Halogens
Non-metals are shiny, good conductors of heat an electricity, ductile, have high melting point.
True
False
It is the distance from the nucleus to the highest energy level.
Metals
Ionization energy
Atomic radius
The Earth crust is composed of oxygen and hydrogen.
True
False
Definition of ionic bond:
Electrons are shared unequally
Electrons are shared equally
Transference of electrons. Attraction of opposite charges
All the electrons give their valence electrons
Definition of polar covalent bond:
Electrons are shared unequally
Electrons are shared equally
Transference of electrons. Attraction of opposite charges
All the electrons give their valence electrons
Definition of nonpolar covalent bond:
Electrons are shared unequally
Electrons are shared equally
Transference of electrons. Attraction of opposite charges
All the electrons give their valence electrons
Definition of metallic bond.
Electrons are shared unequally
Electrons are shared equally
Transference of electrons. Attraction of opposite charges
All the electrons give their valence electrons
How is the charge of a cation?
Positive
Negative
How is the charge of an anion?
Positive
Negative
The physical and chemical properties of an ionic compound such as NaCl are very similar from those of the original elements?
True
False
What is a Polyatomic ion?
Is a group of covalently bonded atoms that has an overall ionic charge.
Is a group of non-covalently bonded atoms that has an overall ionic charge.
Is a group of non-covalently non-bonded atoms that has an overall ionic charge.
Is a group of covalently non-bonded atoms that has an overall ionic charge.
What consists of atoms of two or more non-metals that share one or more valence electrons?
Ionic Compound
Molecular Solution
Molecular Compound
Ionic Solution
Is Sulfur trioxide a Molecular Compound?
True
False
Which is the ability to attract the shared electrons in a chemical bond and is only for atoms?
Electropositivity
Electronegativity
Polarity
Dipole
The Polarity of a bond depend on what?
The difference in electronegativity values of its atoms.
The difference in electropositivity values of its atoms.
As how the differences of electronegativity increases.
As how the differences of electronegativity decreases.
What is a polar covalent bond that has a separation of charges called?
Dipole
Polarity
Electronegativity
Electropositivity
The variations in bonding are separated?
True
False
When the electronegativity difference is greater than 1.8, electrons are transferred from one atom to another?
True
False
