I have a few questions I need help with!
1. Hydrogen bonding will account for the unusual physical properties of water.
TRUE
FALSE
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
saturated
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
You should state your thinking on the problems. We don't Do your homework for you but rather help you but you have to show what you did.
And I'll be glad to help you after you show what you got for these questions or at least show what your thoughts on the questions you have posted.
1. To determine if hydrogen bonding accounts for the unusual physical properties of water, we need to understand what hydrogen bonding is and how it affects water. Hydrogen bonding occurs when a hydrogen atom in a polar covalent bond is attracted to a highly electronegative atom (such as oxygen, nitrogen, or fluorine) in a nearby molecule. In water, the oxygen atom is highly electronegative, and it forms hydrogen bonds with the hydrogen atoms of neighboring water molecules. These hydrogen bonds give water some unique properties, such as high boiling and melting points, high surface tension, and its ability to dissolve many substances.
To answer the question, we need to determine if hydrogen bonding does indeed account for these unusual physical properties of water. By understanding the concept of hydrogen bonding and its effects on water, we can conclude that the statement is TRUE.
2. In this question, we are asked about the composition of air, specifically the percentage of nitrogen gas. To answer this question, we need to know that air is a mixture of gases and that it is considered to be homogeneous, meaning it has a uniform composition throughout. The provided percentages indicate the composition of the various gases in the air.
By looking at the provided information, we can conclude that nitrogen constitutes 79% of the air. Therefore, nitrogen can be considered the solvent in this mixture.
3. This question asks about the solubility of polar solids, such as salt. To answer this question, we need to consider the nature of polar solvents and non-polar solvents. Polar solvents, like water, have a positive and negative end, while non-polar solvents, like oil, do not have charged ends.
Considering this information, we can conclude that polar solids like salt would be expected to be more soluble in water than in non-polar solvents. Therefore, the correct answer is "More soluble in water than in non-polar solvents."
4. This question asks about the properties of basic solutions. To answer this question, we need to know the characteristics of basic solutions. Basic solutions have a pH greater than 7 and contain hydroxide ions (OH-) as the reactive species.
Considering this information, we can conclude that the properties of basic solutions are:
- They turn the dye litmus red: TRUE
- They taste sour: FALSE (basic solutions taste bitter)
- They feel slippery: TRUE
- They react with active metals to produce hydrogen gas: TRUE
Therefore, the correct properties of basic solutions are: They turn the dye litmus red, they feel slippery, and they react with active metals to produce hydrogen gas.
5. This question asks about the behavior of elements in Groups V - VII in terms of gaining or losing electrons to form ions. To answer this question, we need to know the periodic trends and electron configurations of elements in these groups.
Elements in Groups V - VII tend to gain electrons to achieve a full outer electron configuration and form negative ions. Therefore, the correct answer is: c) gain, negative.
6. This question asks about the behavior of elements in Groups I - III in terms of gaining or losing electrons to form ions. Similar to the previous question, we need to know the periodic trends and electron configurations of elements in these groups.
Elements in Groups I - III tend to lose electrons to achieve a full outer electron configuration and form positive ions. Therefore, the correct answer is: d) lose, negative.