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mcat prep > chem > Flashcards

chem Flashcards

1
Q

What is density

A

Mass over volume

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2
Q

What is a molecular formula

A

It is the formula that is giving details exact number of atoms and which atoms are in a molecule

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3
Q

What is it the empirical formula

A

It gives the smallest whole number ratio of the molecular formula

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4
Q

What is ammonium

A

NH4+

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5
Q

What is hydronium

A

H30+

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6
Q

What is Acetate

A

ch3CO2-

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7
Q

What is bicarbonate

A

HCO3-

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8
Q

What is cyanide

A

CN-

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9
Q

What is hydroxide

A

OH-

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10
Q

What is nitrate

what is nitrite

A

NO3-

NO2-

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11
Q

What is perchlorate

A

ClO4-

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12
Q

What is carbonate

A

CO3-

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13
Q

What is sulfate

what is sulfite

A

SO4 -2

SO3 -2

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14
Q

What is phosphate

A

PO4 -3

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15
Q

What is formula weight

A

It is the molecular weight which is the weight of all the items added together in a particular molecule

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16
Q

What is AMU

A

It is the weight of each isotope as listed on the periodic table for the elements

17
Q

What does a mole do

A

It links grams to atomic mass unit

18
Q

What is Avogadro’s number

A

It is 6.02×10^23 molecules

19
Q

What does Avogadro’s number tell us

A

It tells us the number of molecules in 1 AMU

20
Q

What does percent composition by mass Tell us

A

It tells us the percent of each element in a particular molecule

21
Q

What is molarity

A

It is moles of solute / liters of solution

22
Q

What is the mole fraction

A

It tells the number of moles of a particular substance divided by the total mass

23
Q

What is the smallest unit in a molecule

A

Atom

24
Q

What are the three parts of an atom

A

The protons and neutrons electrons

25
Q

What are the charges of the three parts of the nucleus

A

Proton has a positive one charge

the neutron has no charge

electron has a minus one charge

26
Q

What is Z

A

It is the atomic number or the number of protons

27
Q

What is the atomic weight

A

It is an average weight of all of the isotopes in AMU of the element

28
Q

What holds the proton and neutrons in the nucleus

A

The strong nuclear force

29
Q

What holds the electrons within the circle of the nucleus

A

The electrostatic our interactions with the positive charged protons

30
Q

What is an unstable nuclei

A

It is radioactive

31
Q

What does radioactive decay do

A

It makes unstable nuclei undergo a transformation to make them more stable by altering the number in ratio of protons and neutrons or decreasing the energy of the molecules

32
Q

What are the three types of radioactive decay

A

Alpha Beta Gamma

33
Q

What happens in alpha decay

A

An element gives off a helium Adams or for math unit two atomic number units to stabilize the element

it causes a decrease in the neutron number and the Z or the proton number

34
Q

What are the three types of beta decay

A

There is beta minus

beta plus or positron a mission

electron capture

35
Q

What happens in beta minus decay

A

A proton is added to the apparent element and then a beta minus one is injected to balance this out

this happens when there are too many neutrons

there will be a decrease in the number of neutrons and an increase in the number of protons

mcat prep (1 decks)

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