General Chemistry Flashcards
Which of the following is not an example of observable physical property?
a. color
b. mass
c. texture
d. odor
b. mass
Which of the following is an intensive property?
a. mass
b. density
c. volume
d. none of these
b. density
Which of the following is an extensive property?
a. weight
b. density
c. melting point
d. none of these
a. weight
Brass is an example of _________.
a. Element
b. Compound
c. Homogenous mixture
d. Heterogenous mixture
c. Homogenous mixture
Methane is an example of __________.
a. Element
b. Compound
c. Homogenous mixture
d. Heterogenous mixture
b. Compound
He discovered the nucleus with his “Gold Foil” experiment.
a. Eugen Goldstein
b. J.J. Thomson
c. Ernest Rutherford
d. John Dalton
c. Ernest Rutherford
He is credited with the discovery of electron in an atom.
a. Eugen Goldstein
b. J.J. Thomson
c. Ernest Rutherford
d. John Dalton
b. J.J. Thomson
It is the number of proton in nucleus.
a. Valence
b. Atomic charge
c. Atomic mass
d. Atomic number
d. Atomic number
Atoms of the same element with varying number of neutrons
a. isotopes
b. ions
c. element
d. none of these
a. isotopes
He arranged the elements in the periodic table in groups
of 3’s or triads also known as “Law of Triad”.
a. Johann Wolfgang Dobereiner
b. John Newlands
c. Dmitri Mendeleev
d. Julius Meyer
a. Johann Wolfgang Dobereiner
He arranged the elements in the periodic table in groups of 8’s like from lithium to sodium also known as “Law of Octaves”.
a. Johann Wolfgang Dobereiner
b. John Newlands
c. Dmitri Mendeleev
d. Julius Meyer
b. John Newlands
He formulated the Periodic Law.
a. Johann Wolfgang Dobereiner
b. John Newlands
c. Dmitri Mendeleev
d. Julius Meyer
c. Dmitri Mendeleev
The seven horizontal rows in the periodic table are called
__________.
a. groups
b. periods
c. families
d. valence
b. periods
Group 7A is a family of _______
a. Alkali Metals
b. Halogens
c. Noble gases
d. Alkaline Metals
b. Halogens
It is the most ideal gas element.
a. Helium
b. Oxygen
c. Sulfur
d. Neon
a. Helium
Which of the following is arranged in increasing atomic size?
a. Mg > Ca > K > Fr
b. Mg > Sc > Sr > Ca
c. Ca > Mg > K > Sr
d. Ca > K> Mg > Fr
a. Mg > Ca > K > Fr
Which of the following elements is more electronegative:
Cl, S, or Mg?
a. Cl
b. S
c. Mg
d. none of these
a. Cl
Which of the following elements is more reactive: Li, Rb, or Fr?
a. Li
b. Rb
c.Fr
d. none of these
c.Fr
Which of the following elements (Br or Cu) has the
higher ionization energy?
a. Cu
b. Br
c. Both elements
d. None of these
b. Br
Which has a larger ionic size (𝑁𝑎+ 𝑜𝑟 𝑀𝑔2+)
a. 𝑁𝑎+
b. 𝑀𝑔2+
c. Both ions
d. None of these
a. 𝑁𝑎+
Calculate the % Ca in 𝐶𝑎(𝑂𝐻)2.
54.09%
What is the empirical formula of a compound which contains 2.05% H, 32.65% S, and 65.30% O?
H2𝑆𝑂4
What is the empirical formula of a compound which
contains 52.94% Al and 47.06% O?
𝐴𝑙2𝑂3
A compound is 85.69% C and 14.31% H. If the molar mass is 56g/mol, what is the molecular formula of the compound?
𝐶4𝐻8
What is the molecular formula if the empirical formula of a compound is CH. The molar mass of this compound is 78 g.
a.𝐶2𝐻2
b.𝐶6𝐻6
c.𝐶8𝐻8
d.None of these
𝐶6𝐻6
A substance that has the ability to dissolve or disperse one or more substances?
solvent
A solution with solute that dissolves until it is unable to
dissolve anymore, leaving the undissolved substances at the bottom.
saturated solution
A solution that completely dissolves, leaving no remaining substances.
unsaturated solution
A solution that contains more undissolved solute than
the saturated solution because of its tendency to crystallize and precipitate.
supersaturated solution
Agua regia is a/an ______.
a. solution
b. colloid
c. spension
d. all of these
a. solution
Consider 5g of sugar dissolved in 20g of water. What
is the w/w % concentration of sugar in this solution?
20%
A solution is prepared by dissolving 25 mL ethanol in
enough water to make a 200 mL of solution. What is
the concentration of the ethanol in the solution?
12.5
What are the mole fraction of the components of the
solution formed when 92 g glycerol is mixed with 90 g
water? (MW of water = 18, MW of glycerol = 92)
glycerol =0.17
water = 0.83
What is the molarity of a solution containing 32g
of NaCl (58.44 g/mol) in 3.4 liters?
0.16 M
What is the molality of a solution containing
0.46 mole of solute in 2.0 kg water?
0.23 M
What is the molarity of a solution formed from 6.75 g of
NaCl (58.4 g/mol) dissolved in water to make a solution with a total volume of 452 mL?
0.256 M
Calculate the molality of a solution prepared from 29.1 g of toluene (92 g/mol) dissolved in 832 g of benzene.
0.380
If a mixture of gases contains 7.50 g of 𝐻2, 3.25 g of 𝑂2
and 5.55 g of 𝑁2, what is the mole fraction of the oxygen
gas?
0.026
A solution is prepared by dissolving 464 g of NaOH (40 g/mol) in water and then diluting to 1 L. The density of the resulting density is 1.37 g/mL. What is the % mass of NaOH?
33.87%
Sodium carbonate is also known as?
soda ash
