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Chem Tech Boards > General Chemistry > Flashcards

General Chemistry Flashcards

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1
Q

He discovered the nucleus with his “Gold Foil” experiment.

A. Eugen Goldstein
B. J.J. Thomson
C. Ernest Rutherford
D. John Dalton

A

C. Ernest Rutherford

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2
Q

He is credited with the discovery of electron in an atom.

A. Eugen Goldstein
B. J.J. Thomson
C. Ernest Rutherford
D. John Dalton

A

B. J.J. Thomson

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3
Q

Which of the following is an intensive property?

A. mass
B. density
C. volume
D. none of these

A

B. density

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4
Q

Which of the following is an extensive property?

A. weight
B. density
C. melting point
D. none of these

A

A. weight

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5
Q

Brass is an example of ___________.

A. Element
B. Compound
C. Homogenous mixture
D. Heterogenous mixture

A

C. Homogenous mixture

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6
Q

Methane is an example of __________.

A. Element
B. Compound
C. Homogenous mixture
D. Heterogenous mixture

A

B. Compound

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7
Q

Which of the following is not an example of observable physical property?

A. color
B. mass
C. texture
D. odor

A

B. mass

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8
Q

It is the number of proton in nucleus.

A. Valence
B. Atomic charge
C. Atomic mass
D. Atomic number

A

D. Atomic number

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9
Q

Atoms of the same element with varying number of neutrons

A. Isotopes
B. Ions
C. Element
D. None of these

A

A. Isotopes

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10
Q

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

A. Johann Wolfgang Dobereiner

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11
Q

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

A

B. John Newlands

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12
Q

He formulated the Periodic Law.

A. Johann Wolfgang Dobereiner
B. John Newlands
C. Dmitri Mendeleev
D. Julius Meyer

A

C. Dmitri Mendeleev

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13
Q

A substance that has the ability to dissolve or disperse one or more substances?

A. solute
B. crystal
C. solvent
D. none of these

A

C. solvent

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14
Q

A solution with solute that dissolves until it is unable to dissolve anymore, leaving the undissolved substances at the bottom.

A. unsaturated solution
B. saturated solution
C. supersaturated solution
D. none of these

A

B. saturated solution

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15
Q

A solution that completely dissolves, leaving no remaining substances.

A. unsaturated solution
B. saturated solution
C. supersaturated solution
D. none of these

A

A. unsaturated solution

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16
Q

A solution that contains more undissolved solute than the saturated solution because of its tendency to crystallize and precipitate.

A. unsaturated solution
B. saturated solution
C. supersaturated solution
D. none of these

A

C. supersaturated solution

17
Q

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

A. Mg > Ca > K > Fr

18
Q

Which of the following elements is more electronegative: Cl, S, or Mg?

A. Cl
B. S
C. Mg
D. None of these

A

A. Cl

19
Q

Which of the following elements is more reactive: Li, Rb, or Fr?

A. Li
B. Rb
C. Fr
D. None of these

A

C. Fr

20
Q

The seven horizontal rows in the periodic table are called __________.

A. groups
B. periods
C. families
D. valence

A

B. periods

21
Q

Group 7A is a family of _______

A. Alkali Metals
B. Halogens
C. Noble gases
D. Alkaline Metals

A

B. Halogens

22
Q

Which of the following elements (Br or Cu) has the higher ionization energy?

A. Cu
B. Br
C. Both elements
D. None of these

A

B. Br

23
Q

Which has a larger ionic size ( Na+ or Mg2+)

A. Na +
B. Mg 2+
C. Both ions
D. None of these

A

A. Na +

24
Q

Calculate the % Ca in Ca(OH)2.

A. 43.18%
B. 2.73%
C. 54.09%
D. 26.7%

A

C. 54.09%

25
Q

What is the empirical formula of a compound which contains 2.05% H, 32.65% S, and 65.30% O?

A. HSO4
B. H2SO
C. H2SO4
D. none of the above

A

C. H2SO4

26
Q

What is the empirical formula of a compound which contains 52.94% Al and 47.06% O?

A. Al2O3
B. AlO2
C. Al3O2
D. Al3O

A

A. Al2O3

27
Q

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?

A. CH2
B. CH4H10
C. CH4
D. C4H8

A

D. C4H8

28
Q

Agua regia is a/an ______.

A. solution
B. colloid
C. suspension
D. all of these

A

A. solution

29
Q

Sodium carbonate is also known as?

A. caustic potash
B. soda ash
C. caustic soda
D. baking soda

A

B. soda ash

30
Q

It is the most ideal gas element.

A. Helium
B. Oxygen
C. Sulfur
D. Neon

A

A. Helium

31
Q

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

A

B. C6H6

32
Q

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?

A. 0.872 M
B. 0.256 M
C. 0.412 M
D. 0.799 M

A

B. 0.256 M

33
Q

Calculate the molality of a solution prepared from 29.1 g of toluene (92 g/mol) dissolved in 832 g of benzene.

A. 0.114 m
B. 0.380 m
C. 0.567 m
D. 0.787 m

A

B. 0.380 m

34
Q

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?

A. 0.925
B. 0.0253
C. 0.049
D. 0.673

A

B. 0.0253

35
Q

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?

A. 12.80%
B. 11.60%
C. 50.33%
D. 33.87%

A

D. 33.87%

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