I have a test soon. If you can help me with these questions, that would be great.
1. Define and describe the following.
a)Alkaline - metal - base
b)Corrosive - burn/eat away - acid
c)Caustic - harsh - both? (acid + base)
d)Low pH - 0-6.99 - acid
Please check my answers and correct me if I'm wrong.
2. What is the typical pH of the following?
a)Pure water - 7 pH
b)Normal rainwater - 7 pH
c)Acid precipitation - 5.6 pH
d)Human blood - 7.3-7.5 pH
e)Human saliva - 6.5-7.4 pH
Check my answers and provide feedback if wrong.
3. Classify each of the following compounds as organic or inorganic by examining their formulas.
a)CH3OH - organic
b)Mg(HC2O4)2 - organic
c)SiC - organic
d)Na2CO3 - organic
e)FeBr3 - inorganic
f)CH4 - organic
g)NH3 - inorganic
h)CO - inorganic
Please check my answers and correct me if there are mistakes.
Thank you very much. I appreciate your assistance.
3> There is no "official" nor universal definition of organic compounds.
http://en.wikipedia.org/wiki/Organic_compound
Go with your text, but remember texts vary.
Most would not consider as organic the following:
sodium carbonate
silicon carbide
There is a great debate over CO, but most consider it inorganic.
Remember, don't argue with your teacher on these, as there is no universal agreement, so you will lose.
Sure, I'll be happy to help you with these questions. Let's go through each question and provide the correct answers and feedback if needed.
1. Define and describe the following.
a) Alkaline - Alkaline refers to substances that have a high pH, typically above 7. These substances are often metal compounds and can be considered as bases because they can neutralize acids.
b) Corrosive - Corrosive substances have the ability to burn or eat away materials they come in contact with. They are often acids that can react with and destroy other substances.
c) Caustic - Caustic substances refer to materials that are both bases (alkaline) and acids, meaning they have the ability to be harsh or severely damaging.
d) Low pH - Low pH refers to substances that have a pH value between 0 and 6.99. This indicates acidity, with lower values indicating stronger acidity.
Your answers for these definitions are correct.
2. What is the typical pH of the following?
a) Pure water - You correctly identified it as having a pH of 7. Pure water is considered neutral because it has an equal balance of hydrogen (H+) and hydroxide (OH-) ions.
b) Normal rainwater - You correctly identified it as having a pH of 7. Rainwater is typically slightly acidic due to the presence of carbon dioxide in the atmosphere, which forms carbonic acid when dissolved in water.
c) Acid precipitation - You correctly identified it as having a pH of 5.6. Acid precipitation refers to rain, snow, or fog that has an acidic pH due to elevated levels of pollutants like sulfur dioxide and nitrogen oxides.
d) Human blood - You correctly identified the pH range of human blood as 7.3-7.5. Blood needs to be in a slightly alkaline range to maintain proper functioning.
e) Human saliva - You correctly identified the pH range of human saliva as 6.5-7.4. Saliva can vary in pH depending on various factors, such as diet and overall health.
Your answers for the typical pH values are correct.
3. Classify each of the following compounds as organic or inorganic by examining their formulas.
a) CH3OH - You correctly classified it as organic. Methanol (CH3OH) is an organic compound containing carbon-hydrogen (C-H) bonds.
b) Mg(HC2O4)2 - You incorrectly classified it as organic. Magnesium oxalate (Mg(HC2O4)2) is an inorganic compound.
c) SiC - You incorrectly classified it as organic. Silicon carbide (SiC) is an inorganic compound.
d) Na2CO3 - You correctly classified it as inorganic. Sodium carbonate (Na2CO3) is an inorganic compound.
e) FeBr3 - You correctly classified it as inorganic. Iron(III) bromide (FeBr3) is an inorganic compound.
f) CH4 - You correctly classified it as organic. Methane (CH4) is an organic compound.
g) NH3 - You correctly classified it as inorganic. Ammonia (NH3) is an inorganic compound.
h) CO - You correctly classified it as inorganic. Carbon monoxide (CO) is an inorganic compound.
Your answers for the classification of compounds as organic or inorganic are mostly correct, except for b) Mg(HC2O4)2 and c) SiC, as mentioned above.
I hope this helps and good luck with your test! Let me know if you have any more questions.