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CH 1 Lesson 2

Authored by abdelhameed adeeb

Chemistry

12th Grade

Used 1+ times

CH 1 Lesson 2
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10 questions

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1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Why is the atomic mass of nickel considered abnormal in the first transition series?

Due to its high atomic number

Due to the presence of five stable isotopes with an average mass of 58.7 u

Due to its large atomic radius

Due to its high melting point

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Why is the atomic radius nearly constant from chromium (Cr) to copper (Cu) in the first transition series?

Due to the decrease in nuclear charge

Due to the increase in the number of 3d electrons causing repulsion

Due to the decrease in the number of electrons

Due to the decrease in atomic mass

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Why are the elements of the first transition series used in making alloys?

Due to their high melting points

Due to their high densities

Due to the relative constancy of their atomic radii

Due to their metallic luster

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Why do the elements of the first transition series have high melting and boiling points?

Due to the weak metallic bonds

Due to the large number of electrons forming strong metallic bonds

Due to their large atomic size

Due to their low atomic mass

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Why is the magnetic moment of manganese (25Mn) larger than that of cobalt (27Co)?

Because manganese has more paired electrons

Because cobalt has more unpaired electrons

Because manganese has 5 unpaired electrons in the 3d sublevel

Because cobalt has a larger atomic radius

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Why are transition metals considered ideal catalysts?

They have high melting points.

They have large atomic radii.

They participate in the formation of bonds between reacting molecules and atoms on the surface of the metal.

They are non-reactive.

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which of the following is used in the decomposition reaction of hydrogen peroxide?

Divided Nickel

Manganese dioxide

Vanadium pentoxide

Divided Iron

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