Ch 12

how many electrons are used to draw the electron-dot structure for hydrogen peroxide (a covalent compound with the formula, H2O2)

14

how many electrons are shared in a single covalent bond?

2

which of the following shows elements in order of increasing atomic size (Cl, aromic number 17; K, atomic number 19...)?

Cl<Br<K<Rb

classify the following bonds as ionic, covalent, or neither (O, a# 8; F, a# 9; Na, a# 11; Cl, a# 17; U, a# 92). O with F; Ca with Cl; Na with Na

Covalent; ionic; neither

if sodium ions, Na+, have a 1+ charge and sulfate ions, SO4 2-, have a 2- charge, the compound sodium sulfate is:

Na2SO4

Both nitrogen and phosphorus are able to attract three more electrons to their outer shells bc..

all of the above

water, H2O, and methane, CH4, have about the same mass and differ by only one type of atom. why is the boiling point of water so much higher than that of methane?

all of the above

atoms or ions can be blended in any proportion within...

an alloy

plastic wrap is made of nonpolar molecules and is able to stick well to polar surfaces, such as glass, by way of dipole/induced dipole molecular attractions, how is it that plastic wrap also sticks to itself so well?

by way of induced dipole-induced dipole molecular attractions

what elements tend to form ionic compouns?

elements found on opposite sides of the periodic table

covalent and ionic bonds differ in that

ionic bonds dont involved the sharing of electrons

when a solution is concentrated

large amounts of solute are dissolved in solvent

the atoms of materials that conduct electricity best tend to be held together by...

metallic bonds

The valence electrons of elements in the same atomic period are similar because elements in the same atomic period have the same number of...

none of the above

fish dont live very long in water that has just been boiled and brought back to room temp. suggest why

the boiling process removes the air that was dissolved in the water. upon cooling the water is void of its usual air content, hence, the fish drown.

the greater the difference in electronegativity between two covalently bonded atoms,

the greater the polarity

atoms of metallic elements can form ionic bonds, but they are not very good at forming covalent bonds. Why?

the have a great tendency to lose electrons