A) it is a science about properties heterogeneous highdisperse systems and
B) it is a science about heterogeneous rudedisperse systems and about processes proceeding in them
C) it is a science about diphasic systems and their properties
D) it is a science about properties of colloidal solutions.
E) about processes proceeding in them
F) it is a science about homogeneous highdisperse systems.
$$$ 51
One of the basic differences of colloidal systems from molecular solutions?
A) aggregate stability
B) heterogeneity of systems
C) homogeneity
D) color
E) non-equal systems
F) solubility.
$$$ 52
When was added the “ zero” group to the periodic table ?
A) after the discovery of helium, argon, krypton and xenon by Lord Rayleigh and Sir William Ramsay in 1894
B) after the discovery of helium, neon, argon, krypton and xenon by D.I.Mendeleev in 1894
C) after the discovery of helium, neon, argon, krypton and xenon by Lavoisier Sir William Ramsay in 1894
D) after the discovery of alkali metals in 1894
E) after the discovery of alkali earth metals in 1894
F) after the discovery of neon, krypton and xenon by Lord Rayleigh and Sir William Ramsay in 1894
G) after the discovery of helium, neon, argon, krypton by Lord Rayleigh and Sir William Ramsay in 1894
$$$ 53
Choose the right sentences in Past Perfect Tense:
A) When she gone out to play, she had already done her homework.
B) The storm destroyed the sandcastle that we had built.
C) The storm destroyed the sandcastle that we have built.
D) When she went out to play, she already done her homework.
E) The storm destroyed the sandcastle that we built.
F) When she went out to play, she had already did her homework.
G) When she went out to play, she had already written a letter.
$$$ 54
Why the periodic law was accepted immediately after its proposal by Mendeleyev
A) because of chemical properties of elements
B) because of their atomic number
C) because of a number of elements in different positions
D) because of their atomic number and structure
E)& because of its success in making predictions.
F) & predictions were afterward verified by experiment.
$$$ 55
How D.I.Mendeleev discovered the famous periodic table ?
A) made a thorough study of the relation between the atomic weights of the elements and their structure
B) made a thorough study of the relation between the atomic weights of the elements and their electrons
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C) & made a thorough study of the relation between the atomic weights of the elements and their physical properties
D) made a thorough study of the relation between the atomic weights of the elements and their protons
F) & made a thorough study of the relation between the atomic weights of the elements and their chemical properties.
$$$ 56
Fill in the blanks with prepositions where necessary. D. I. Mendeleyev made ... a thorough study ... the relation ... the atomic weights... the elements and their properties.
A) in
B) -
C) on
D) between
E) up
F) of
G) to
$$$ 57
Fill in the blanks with prepositions where necessary. Mendeleyev placed... a number... elements... different positions.
A) -
B) with
C) of
D) to
E) in
F) without.
G) on.
$$$ 58
Fill in the blanks with prepositions where necessary. Most .of the elements occur ... the periodic table ... the order ... increasing atomic weights.
A) between
B) in,
C) of
D) to
E) in
F) of
G) on.
$$$ 59
Fill in the blank with necessary words (synonyms): A law will not explain the fact, it only … the fact.
A) gives
B) justifies
C) states
D) correlates
E) deducts
F) confirms
G) proves.
*****
$$$ 60
Fill in the blanks with prepositions where necessary. Mendeleyev predicted the existence ... six elements corresponding ... vacant places... his table.
A) of
B) of, in, of
C) -, to, of
D) of, in, to
E) of, to, in
F) the, for, in
G) at, on,as.
$$$ 61
Choose the right sentences in Present Indefinite Passive:
A) I am explained the metal’s properties
B) Students good in writing essay
C) She likes read books.
D) Chemists are given new reagents
E) T he article is written by scientist
F) Newspapers and the internet.
G) Magazines are interesting.
$$$ 62
Choose the right sentences in Present Perfect Passive:
A) The job has finished by me.
B) The job had been finished by me.
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C) The job has been finished by me.
D) The milk had been drunk by the cat.
E) The milk was been drunk by the cat.
F) The milk has been drunk by the cat.
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