Matter and Change
Atomic Structure
The Periodic Table
Covalent Bonding
Chemical Names and Formulas
100
what is the difference between homogeneous mixtures and heterogeneous mixtures?
a homogeneous mixture is uniform in composition (some examples are DISSOLVED salt in water, blood, brewed tea or coffee, or wine) a heterogeneous mixture is a mixture that is not uniform (examples include: sand, oil in water, olive oil)
100
what is an atom?
atoms are the smallest particles of matter
100
How did Mendeleev's work contribute to the discovery of elements?
Putting the already known elements in a table allowed to see where there were holes, and predict what the still undiscovered elements would be like
100
What a covalent bond between atoms in witch the electrons are shared unequally is a polar bond?
a covalent bond between atoms in witch the electrons are shared unequally
100
What is the net ionic charge of every ionic compound?
zero
200
how many phases does a solution have?
1
200
whats is the charge, positive or negative, of the nucleus of every atom?
The nucleus of every atom has positive charge
200
How many elements were discovered by the early 1700's?
13
200
What is the octet rule?
atoms react by losing or gaining electrons so as to acquire the stable electron structure of a noble gas, usually eight valence electrons
200
Name this compound NaCLO3?
sodium chlorate
300
what is the goal of a distillation?
To purify or to separate different components or compounds or different fractions
300
The nucleus of every atom has positive charge?
the nucleus contains only protons and neutrons which have no charge
300
How are the elements arranged in the modern periodic table?
in order of increasing atomic mass
300
Explain what is meant by bond dissociation?
Explain what is meant by bond dissociation bond dissociation energy is defined as the energy needed to break one covalent bond
300
What is this compound Fe(C2H3O2)3?
iron(III)acetate
400
how could you distinguish an element from a compound?
An element has only one kind of atom, while compounds have two or more types of atoms. Also, compounds can be broken down further, while elements cannot.
400
what is the difference between the mas number and the the atomic number of an atom?
The difference between the atomic number and the mass number is that the atomic number is the number of protons in the nucleus of an atom of that element. The mass number is the total number of protons and neutrons in the atom.
400
Is the fallowing true or false? the periodic law states that when elements are arranged in order of increasing atomic number, there is a periodic repetition of physical and chemical properties?
true
400
why do compounds with strong intermolecular attractive forces have higher boiling points?
more energy is required to separate the molecules
400
Where on the periodic table will you find the two elements in a binary molecular compound?
the right hand side
500
what does the formula H2O tell you about the composition of water?
The formula H2O tells you that one molecule of water contains one Oxygen atom and two Hydrogen
500
what is Daltons atomic theory?
All matter is made of atoms. Atoms are indivisible and indestructible. All atoms of a given element are identical in mass and properties. Compounds are formed by a combination of two or more different kinds of atoms. A chemical reaction is a rearrangement of atoms.
500
Is the fallowing true or false? the subatomic particles that play the key role in determining the properties of an element are electrons?
false
500
the melting point of a compound is 1240 degrees C.is this compound most likely an ionic or a molecular compound?
ionic
500
What is this compound LiOH?
lithium hydroxide
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