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447 views

Which is more electronegative, Anions or Cations? [closed]

Electronegativity is the tendency of atoms in covalent bonds to attract electrons closer to themselves (I'll admit I realised ions do not form covalent bonds only after I finished writing). ...
54 views

How do I write a balanced redox reaction for the oxidation of chalcocite [(Cu2S) (s)] by O2 (g) to form Cu2+ (aq) and SO42- (aq) [closed]

I'm not exactly sure how to get the oxidation and reduction half reactions. Any help will be much appreciated!
45 views

Grams of solution of magnesium chloride given molarity of chloride ion [closed]

To make 100. mL of a solution that is 0.25 M in chloride ion, how many grams of magnesium chloride would you need to dissolve? I had a few different approaches to this, but my most immediate thought ...
159 views

Reactions with a positive Delta H and a negative Delta S are said to be nonspontaneous at ALL temperatures. But what if the temperature IS low enough? [closed]

What I mean is, that if you use G = H-TS and make the temperature low enough, couldn't you make any reaction spontaneous? For example, you have a Delta H of 85 kJ and a Delta S of -66 J/K. I've been ...
64 views

Why are functional groups a part of hydrocarbons? [closed]

So, I was asked a very innocent question by my friend that all hydrocarbons are defined as compounds made up entirely of hydrogen and carbon(which can be confirmed by going to any educational site ...
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Do serotonin drugs contain serotonin or a precursor to it, e.g. tryptophan?

With serotonin drugs, is it actually serotonin in the drug, or is it tryptophan which converts into serotonin through the biochemical conversion process after the drug is consumed? Serotonin can be ...
2k views

How do I calculate the molarity of a 40% w/v HCl solution? [closed]

A 40% hydrochloric acid (w/v) is found to have density of 1.20g /mL. The molarity of the solution is nearly?
459 views

Moles and chemical equations [closed]

Sulfur reacts with oxygen according to the following equation: 2S + 3O2 -----> 2SO3 If 4 moles of sulphur reacts with 9.5 moles of oxygen, how many moles of oxygen would remain after the reaction?
5k views

How much energy is needed to convert 20.0 grams of water at 15.0 degrees C to steam at 100.0 degrees C? [closed]

How much energy is needed to convert 20.0 grams of water at 15.0 degrees C to steam at 100.0 degrees C?
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Which corrodes faster at 5% NaCl solution at room temperature: Steel or Aluminum? [closed]

Which corrodes faster at 5% NaCl solution at room temperature: Steel or Aluminum? Is it true that Al has high corrosion resistance? Or is it just a myth as stated in this article.
1k views

Ionisation energy [closed]

Explain why the 1st ionization energy of boron is less than that of beryllium, whereas the 2nd ionization energy of boron is greater than that of beryllium.
770 views

What happens when utensils are washed in detergent or soap.what type of reaction it is? [closed]

What happens when plates after dinner are washed with soap or detergent ? What colour change is observed? What type of reaction it is?
419 views

Organic Chemistry..What is the order of importance when naming a hydrocarbon? [closed]

What is the order of importance when naming a hydrocarbon? How do you know what becomes the suffix, and what becomes the prefix between the functional groups?
543 views

Resonance energy [closed]

Which resonating structures are more stable . How to comment about stability among resonating structures . What are its criterea ? Explain with simple examples with rule?
467 views

units of mole formula [closed]

I am a high school student.I am currently studying "moles" chapter in my textbook.I think my book is misleading me in regards with units of a formula. The formula is, NO.of moles= (Given mass of an ...
79 views

charged particles [closed]

Why are charged particles influenced by magnetic fields? Is it the charicteristic charge itself that the field interracts with (positive or negative) or is there something else about the proton or ...
192 views

An **atom** is the smallest constituent unit of ordinary matter that has the properties of a chemical element [closed]

An atom is the smallest constituent unit of ordinary matter that has the properties of a chemical element. my Question:ordinary matter = chemical element??? A chemical compound is an entity ...
6k views

Chemical Reaction ammonium hydroxide + aluminum chloride (3NH4OH + AlCl3 -> 3NH4Cl + Al(OH)3) [closed]

What is the color of the precipitate of Al(OH)3?
2k views

How to find the equivalence point on a graph of an acid-base titration curve? [closed]

Here is the data taken from the lab: Acid pH, Vol (cm3)[ (9.67, 4cm3) (9.08, 8cm3) (8.70, 10cm3) (8.06, 12cm3) (7.93, 13cm3) (4.76, 14cm3) (2.45, 15cm3) (2.23, 16cm3) (2.10, 17cm3) (2.01, ...
126 views

An acid and Sodium carbonate [closed]

I have to explain why it 'fuzzes' when an acid is added to Sodium carbonate? And what are the relevant Chemical equation(s).. I'm stuck with this question. I'd appreciate some help here. Thanks a ...
Many p-block elements which are the first in their respective groups show $pπ-pπ$ multiple bonding. Why doesn't carbon do so?