Unit 3
what are the three states of matter?
Solid, Liquid, Gas
What are the three parts of an atom, and what are the charges associated with them?
-Protons (+)
-Electrons (-)
-Neutron (NA)
What is evidence that a chemical reaction has occurred?
color change, formation of gas, odor change, change in temperature, and the release of energy
How is stoichiometry used?
To find quantities that can be produced from certain chemical reactions
what is the mole to mole conversion formula?
mol given l mol unkown
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l mol given
What is the difference between physical and chemical properties?
-a physical property is a characteristic that can be observed without changing the identity of the substance
-a chemical property is a characteristic that cannot be observed without changing the identity of the substance
What is the law of conservation of mass?
The law of conservation of mass states: Mass can be neither created or destroyed
What symbol is used to represent a product has been formed
an ---->
What is a mole ratio
the rati between the numbers of moles of any two of the substances in a balanced chemical equation
What is the mass to mole conversion formula?
mass given l 1 mol given l mole unkown
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l molar mass l mole given
What is the difference between a heterogeneous and homogenous mixture?
-A heterogeneous mixture is a mixture that does not blend smoothly throughout and individual substances remain unique
-A homogenous mixture is a mixture that does has constant composition throughout
What is an atomic number?
An atomic number is the number of protons an element contains
describe the differences between exothermic and endothermic reactions
-exothermic reactions release heat
-endothermic reactions absorb heat
What is a product and what is a reactant?
-a reactant is a substance that is present at the start of a chemical reaction
-a product is a substance that is a present at the end of the chemical reaction
what is the mass to mole conversion formula
mol given l mol unknown l molar mass given
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mol given l 1 mole unkown
What is the difference between a compound and a mixture?
-mixtures are formed by mixing two substances that are not chemically combined
-compounds are formed by mixing two substances that become chemically combined
What are the main points of Daltons Atomic theory
-everything is composed of atoms
-atoms are indivisible blocks of matter and cannot be destroyed
-all atoms of an element are identical
-the atoms of different elements vary in size and mass
How can the law of conservation of mass be obeyed
by balancing equations
What is the balanced equation for: Al2O3 ---> Al + O2
2Al2O3 ----> 4Al +3O2
What is the mass to mass conversion template?
mass given l 1 mol given l mol ratio unknown l molar mass unknown
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molar mass given l mol ratio known l 1 mol unkown
What is the law of mulitiple proportions
When different compounds are formed by a combination of the same elements, different masses of one element combine with the same fixed mass of the other element in a ratio of small whole numebrs
How many protons and electrons are in uranium
92 protons and 92 electrons
Balance the equation: (CH4)+O2 --->CO2+H2O
(CH4)+3O2 --->CO2+2H2O
What is the mole ratio for this equation: 2K(s) + Br (l) ---->2KBr(s)
2 mol K and 2 mol K
--------- ---------
1 mol Br and 2 mol K
How much copper forms when 10.1g of Fe are added to a solution of Copper (II) sulfate?
2Fe + 3Cu(SO4) ---> Fe2(SO4) + 3 Cu
17.2 g Cu