March 29, 2015

Homework Help: Science(chem)

Posted by salinas on Wednesday, March 12, 2008 at 12:37am.

I have a few questions I need help with!
1. Hydrogen bonding will account for the unusual physical properties of water.

2. Air is considered to be a homogeneous mixture that is 79% nitrogen gas, 20% oxygen gas and 1% all the other gases. In this mixture, nitrogen can be considered:
a solvent
a solute
a solution

3. Polar solids such as salt would be expected to be:
More soluble in water than in non-polar solvents.
more soluble in non-polar solvents than in water.
equally soluble in water and non-polar solvents.
none of these are true.

4. Which of the following are properties of basic solutions?
They turn the dye litmus red.
They taste sour.
They feel slippery.
They react with active metals to produce hydrogen gas.

5. Elements in Groups V - VII tend to _____ electrons in order to form ______ ions.
a) gain, positive
b) lose, positive
c) gain, negative
d) lose, negative

6. Elements in Groups I - III tend to _____ electrons in order to form ______ ions.
a) gain, positive
b) loss, positive
c) gain, negative
d) lose, negative

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