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116 terms

chem

chemistry
STUDY
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what is the correct value for Avogradro's number?
6.022E23
One mole of Boron has a mass of _____ g
10.811
What is the mass in grams of 5.40 moles of Lithium
37.8g
Calculate the molar mass of calcium nitrate
164.1
Determine the emperical formula of a compoound containing 60.3% magnesium and 39.7% oxygen
MgO
What is the mass percent of carbon in oxalic acid, H2C2O4
26.7
which ingredient is the limiting reactant if you have 5 cups of flour, 9 eggs and 3 tbs of oil? Given: 2 cups flour + 3 eggs + 1 tbs oil- 4 waffles
flour
how many grams of water are made from the reaction of 16 grams of oxygen gas? Given: 2H2 + O2- 2H2O
18
How many moles of water are made from the reaction of 1.4 moles of hydrogen gas? Given: 2H2 + O2- 2H2O
1.4
What type of reaction is the generic equation A+BC- AC+B
single displacement
What is the net ionic equation for the reaction of hydrochloric acid with potassium hydroxide
(H^+) +(OH-) - H2O
A sample of oxygen gas that contains Avogadro's number of atoms has a mass of?
16 g
The molecular weight of a compound X(NO3)3 is 213. the atomic weight of x is? which is
27; Al
Consider the following generic chemical equation: 2A+5B-C+3D. If you react 4 units of A with 10 unites of B, which statement is true
there are equivalent amounts of A and B
What is the percent yield of CuS for the following reaction given that you start with 15.5 g of Na2S and 12.1g CuSO4? The actually amount of CuS produced was 3.05 g. Reaction Na2S+CuSO4- Na2So4+CuS
42.1%
What is the limiting reactant for the following reaction given we have 3.4 moles of Ca(NO3)2 and 2.4 moles of Li3PO4? Reaction: 3Ca(NO3)2+2Li3PO4- 6LiNO3+ Ca3(PO4)2
Ca(NO3)2
The reaction HNO3(aq) + KOH(aq)- KNO3(aq)+ H2O is best classified as
acid-base neutralization
The reaction Pb(NO3)2(aq)+K2SO4(aq)- PbSO4(s)+2KNO3(aq) is best classified as
precipitation reaction
The reaction Cu(s)+2AgNO3(aq)-Cu(NO3)2(aq)+ 2Ag(s)
oxidation-reduction reaction
Write a balanced net ionic equation for the reaction of Pb(NO3)2(aq) with NaI(aq)
(Pb^2+)aq+ (2I^-)aq-PbI2(s)
Which one the following compounds is soluble in water
Pb(NO3)2
All of the following compounds are soluble in water EXCEPT
PbCl2
Name the aromatic compound
Bromobenzene
Name the following compound CH3-CH2-CH2-CH--(double bond) CH2
1-pentene
What is the main product when 232/90Th undergoes beta decay
232/91 Pa
Which of the following statements about carbon is FALSE
none of the above;
What molarity should the stock solution be if you want to dilute 250 ML to 2L and have the final concentration be .103 M?
8.24 M
The functional groups in the molecule below are H2NCH2CO2H
alkane, amine and carboxylic acid
A compound named +propanal" would be classified as an
Aldehyde
Tritium (3/1 H) is an isotope of hydrogen that is sometimes used to make the hands of watches glow in the dark. The half-life of tritium is 12.3 years. After 49 years, approximately how much of the original tritium remains?
6.25%
What is the missing particle? 231/90 Th=_+231/89 Ac
positron
Given that you wished to use exactly .325 mole of NaCl to prepare a 2.5 M NaCl solution, how many milliliters of solution must you prepare?
130 mL
Suppose a Vodka martini contains 30% alcohol with the remaining portion of the drink composed of water. what is the solute in this type of martini?
alcohol
What is the mass percent of an ammonium carbonate solution prepared by dissolving 33.2 grams of solid into 39.5 grams of water?
45.7%
What is the main product when 235/92 U undergoes alpha decay
231/90 Th
Nuclear fusion:
all of the above
the self-amplifying reaction in which neutrons produced by the fission of one nucleus would induce fission in other nuclei is called
chain reaction
which of the following is the formula for heptane
C7H16
which type of hydrocarbon is classified as being saturated
alkanes
what volume of 12 M HCl is required to make 75 mL of 3.5 M HCl?
21.9 mL
A Geiger-Muller counter detects radioactivitiy by:
ionization of argon gas in a chamber which produces an electrical signal
Which of the following functional groups represents an alcohol?
-OH
Which of these compounds would you expect to be least soluble in water
N2
what is the molarity of a solution prepared by dissolving 54.3 g of Ca(NO3)2 into 355 mL of water?
.932 M
A .15 M solution of BaCl2 contains:
.15M (Ba^2+) ions and .30 M (Cl-) ions
Which of the following functional represents a ketone?
O
||
R- C - R
What is the missing particle? 231/90 Th- _+231/91 Pa
beta particle
A consistent framework for organizing scientific knowledge is a
theory
which of the following is a heterogeneous mixture
root beer float
which of the following is a homogeneous mixture
chicken broth
which of the following processes does not represent a chemical change
dissolving sugar in water
which of the following processes does not represent a physical change
fermenting grape juice
which of the following does not represent a physical property
flammability
one mole of potassium sulfate contains:
4 moles of oxygen
how many atoms are in 15.6 grams of silicon
3.34E23
how many moles of bromine gas are in 37.7 grams
.24 mol
which of the following is not an example of matter
light
which of the following is a compound
water
which state of matter has atomic spacing that is close together and indefinite shape
liquid
which state of matter has indefinite shape and is compressible
gas
which state of matter has atomic spacing that is close together and definite shape
solid
a pure substance is
composed of only one type of atom or molecule
.00504 in scientific notation
5.04E-3
which of the following is the smallest distance
1 nm
for the following measured numbers the significant figures is indicated in parenthesis. which is correct
0.0130 (three)
the number of significant figures in 2.08E-4 cm is
3
An experiment calls for 22.6 g of bromine. (d=3.12 g/mL). what volume, in mL, should be used?
7.24
Express the following result to the proper number of significant figures. 45.36M/3.2S
14
Perform the indicated operations and give the answer in cm with the proper number of significant figures, 12.64 cm -48 mm +.246 m=
32.4
which of the following is a part of Dalton's atomic theory
atoms are rearranged but not changed during a chemical reaction
which of the following is not explained by Dalton's atomic theory
the existence of more than one isotope of an element
the existence of electrons in atoms of all elements was demonstrated by
thomson's cathode ray tube experiment
which subatomic particle has the smallest mass
an electron
which of the following two atoms are isotopes
12/6 C and 13/6 C
how many protons and neutrons are in an atom of 90/38 Sr
38 p. 52 n
the horizontal rows of the periodic table are called
periods
the vertical columns of the periodic table are called
groups
Lithium belongs to the ____ group of the periodic table
alkali earth
Bromine belongs to the ____ group of the periodic table
halogen
Argon belongs to the ____ group of the periodic table
noble gas
what is the charge on the Cr in the ionic compound Cr2O3
3+
Which of the species below has 28 protons and 26 electrons
(Ni2+)
the chemical formula for the sulfite ion is
(SO3)^2-
the chemical formula for sulfurous acid is
H2SO3(aq)
what is the formula for an ionic compound made of magnesium and sulfur
MgS
what is the name of CoS
Cobalt (2) sulfide
What is the name of the compound made from lithium and oxygen
lithium oxide
what is the formula for an ionic compound of aluminum and oxygen
Al2O3
what is a chemical reaction
when one or more new compounds are formed by rearranging atoms
given the following generic chemical reaction, which is the product
X-Y
Y is the product
What are the coefficients for the following reaction when it is properly balanced?
_ potassium iodide + __ lead (2) acetate- __ lead (2) iodide + __ potassium acetate
2,1,1,2
which of the following represents wavelength
upside down y
which of the following represents frequency
v
the distance between adjacent wave crests is called
wavelength
what happens to an atom when it absorbs energy
the atom re-emits the energy as light
which of the following elements has the highest ionization energy
Ne
which of the following atoms is the largest
Cs
the elements with the highest electronegativity values tend to be found in the
upper right-side of the periodic table
which molecule listed below has a nonpolar covalent bond
H2
what is the molecular geometry of (NH4)+
tetrahedral
the electron geometry and the molecular geometry of water are respectively
tetrahedral, bent
which term matches the definition: A separation of charge within a bond
dipole movement
which molecule listed below has a polar covalent bond
H2O
all of the following statements are consistent with the kinetic molecular theory of gases EXCEPT
strong attractive forces hold the gas molecules together
what is the equivalent pressure of .905 atm in units of mm Hg
688
To solve problems using Boyle's Law, which mathematical equation should be used?
P1V1=P2V2
A balloon filled with .5 L of air at sea level is submerged in the water to a depth that produces a pressure of 3.25 atm. What is the volume of the balloon at this depth?
.154 L
To solve problems using Charle's Law, which mathematical equation should be used
V1/T1=V2/T2
a 325 mL sample of gas is initially at a pressure of 721 torr and a temperature of 32C. If this gas is compressed to a volume of 286 mL and the pressure increases to 901 torr, what will be the new temperature of the gas?
62.4
what is the initial temperature of a gas if the volume changed from 1 L to 1.1 L and the final temperature was determined to be 255C
207C
the amount of heat required to melt one mole of a solid is called
heat of fusion
which intermolecular forces are found in CO2
dispersion f0rces
How many joules of heat are needed to completely vaporize 24.4 grams of water at its boiling point?
5.5E4
which compound in liquid form will have the highest vapor pressure
CH4
copper is what type of solid
metallic atomic solid
NaCl is which type of solid
ionic solid