Friday
April 18, 2014

Homework Help: chemistry

Posted by mike on Monday, April 23, 2012 at 8:01am.

1 _____is defined as one-half of the distance between the nuclei of two adjacent metal atoms in the close packed crystal lattice
ionic radius
metallic radius
covalent radius
atomic radius

2 Except for rubidium and caesium,
all common cations are smaller than all common anions
all common cations are larger than all common anions
all common cations are of the same size with all common anions
the cations are not avaliable

3 Increase in principal quantum number(n) means-----of the atomic radii
shrinking
no change
increase
decrease

4 The attractive force which binds a hydrogen atom of one molecule with an electronegative atom of another molecule of the same compound is called---------
nuclear bond
electromagnetic force
hydrogen bond
covalent bond

5 Which of these bonds has the weakest bond energy?
hydrogen bond
electrovalent bond
covalent bond
metallic bond

6 The most abundant metal in sea water is -------
zinc
sodium
lithium
rubidium

7 Which of these metals is radioactive?
rubidium
francium
potassium
lithium

8 Which of these hydrides has the high boiling point?
boron hydride
stannane
water
methane

9 A consequence of ------- is the formation of a chelate ring
intramolecular covalent bonding
intermolecular covalent bonding
intramolecular hydrogen bonding
intermolecular hydrogen bonding

10 Alkali metals can be used for all but one of the following
as street lights
as rocket fuel
as a coolant
undergroud high voltage transmission

11 Potassium compounds can be used for all but one of the following
manufacture of glass
liquid detergents
plant fertilizer
gun powder

12 Within the alkali metals atomic size --------
has no pattern
remains the same
increases down the group
decreases down the group

13 Ionization energy------ down the group within the alkali metals
increases
has no fixed pattern
remains constant
decreases

14 Alkali metals react with sulphur to form ---- types of sulphides
2
3
4
5

15 Hydrides of alkali metals react with water to librate------
light
oxygen
hydrogen
ammonia

16 The charge on cations------ down a group
remains constant
does not have a fixed pattern
increases
decreases

17 Which of these increases solubility of compounds
two cations
a small cation and a large anion
a large cation and anion
a small cation and anion

18 Decrease in hydration energy makes a compound ------
electropositive
electronegative
insoluble
soluble

19 Which of these element does not belong to the alkali metals
caesuim
rubidium
lithium
Radium

20 When a metal is sourrounded by solvent molecules not water, the phenomenon is called--------
instability
hydration
complexation
Solvation

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