Leonardo
  • Member for 9 years, 5 months
  • Last seen more than 4 years ago
Calculating the heat capacity of a calorimeter
Accepted answer
4 votes

$12.5\ \mathrm{kJ}$ of heat was absorbed by the surroundings. I found this by using the mcat formula and the specific heat capacity of water (4.18 J/(g °C)): $Q=m\cdot c\cdot\Delta T$ $Q = 950\ \...

View answer
What is the correct lewis structure of SCH⁻?
Accepted answer
8 votes

This model seems reasonable, as you can see from the formal charges carbon has the -1 value while the rest are 0. One thing that you have forgot is to add brackets around the structure to show that it ...

View answer
Is tin and tinware toxic?
3 votes

I don't believe it is the metal itself that should concern you, but when it reacts with something in your food it might lose its metallic bond and therefore allow you to ingest tiny amounts of tin via ...

View answer
What are the alternatives to the Periodic Table of the Elements?
Accepted answer
12 votes

One periodic table that apparently physicists find useful is ADOMAH periodic table, for its usefulness is finding electron configuration of a particular element. More information at this guide. A ...

View answer
Will alcohol or soap damage plastic or rubber?
3 votes

My advice: Look up manuals where applicable, or experiment with methods if you cannot find good answers, hopefully, you can figure out what exact material it is you are cleaning. What I can tell you ...

View answer
Calculating heat capacity of a calorimeter
1 votes

First, is this a question from your book, and do you have the correct answer to check your work. Do you know how to use dimensional analysis? Start with 50 mL. You have 2 Molarity of some subtance, ...

View answer
Common flame-retardant plastic film materials?
1 votes

What have you found so far? In a situation like this honestly I would go ahead and research what hot air balloons are commonly made with already. Find somebody more experienced in the hobby and ask ...

View answer
Significant Figures Interpretation
1 votes

In your example 0.000023 oz does indeed have two significant figures. It is indeed probably something only a very fine tuned scale could measure. Now consider that you add that mass to another sample ...

View answer
What makes Kleenex Cool Touch tissues cool to the touch, and is it safe?
Accepted answer
5 votes

My first guess as to the nature of this behaviour is similar to water. Hypothermia is a realistic risk if you are drenched in water. This is because water can absorb large amounts of energy (it has a ...

View answer
What is the specific structure of Poly(allylamine hydrochloride) (C3H7N)n HCl?
Accepted answer
3 votes

My intuition is telling me that, based on your empirical formula and the image you provided, all three carbons are at the bends in the line-notation as is conventional in bond-line notation. The ...

View answer
Is it safe to hold silicon nitride ceramic without protection?
Accepted answer
2 votes

I have done a minimal amount of research to try and help you understand this material. The credibility of this research is very debatable, as it basically involves me typing in silicon nitride into ...

View answer
If a sugar is nonreducing, does that mean it doesn't ionize in water?
5 votes

I believe the confusion lies with the term Reducing sugar. From my perspective sucrose is not an ionic compound, it is covalently bonded. I believe that this should indicate to you that it does not "...

View answer
Lewis structures of H₂(C)xCH₂ molecules
Accepted answer
6 votes

What are the bond angles in a normal trigonal planar arrangement? Treat the center atom as in H C H as a trigonal planar arrangement with the middle (carbon) atom in the center with a third atom ...

View answer
Does this set of quantum numbers have a unique solution?
Accepted answer
5 votes

You haven't gotten anything wrong, you are entirely correct! A set of quantum numbers can be used to identify the specific electron in the sub-atomic world of an atom, and what path it occupies in ...

View answer
Why does hand sanitizer turn into a liquid after coming out of the bottle?
Accepted answer
9 votes

A little research and perhaps a small experiment might help you figure something like this out on your own. First, have you tried wikipedia? A small mention of research can go a long way. Describing ...

View answer
Why do H₂ and O₂ create H₂O?
6 votes

Adding on to DaleSwanson's correct answer: The ball-and-hill analogy is just saying that a ball will roll down a hill. This is because if the path is available it will find a way to the bottom of the ...

View answer
Determining the exact charge of ions that will be formed by an atom using the periodic table
4 votes

Each atom tends to imitate the noble gases which have a full valence shell. Looking at your table you can see that boron is 3 spaces above helium, but 5 spaces behind neon. Boron would "prefer" to ...

View answer
How do I find change in Gibbs free energy of water formation?
1 votes

Warning: this is only a way to estimate and not necessarily good practice. I never actually did one like this, but I believe that one must use the equation $\Delta G$° $= \Delta H$°$ - T\...

View answer
What causes reactions to react the way they do?
6 votes

If the reactants are AB + CD, it will be a double displacement (2 pairs of compounds) An example of this might be two salts that dissociate into their respective ions in a solvent, and then the ...

View answer
Percent composition of nitrogen in fertilizer
2 votes

I got 17.542% by mass nitrogen. An explanation for beginners, a refresher for the rest of us: To make sure anyone reading knows what molar mass means: The mass of one mole of something, in our case ...

View answer
Why is water a dipole?
7 votes

Fundamentally, dipolar simply means that a region of the molecule has a center of positive charge and a center of negative charge. We can say that water has a dipole moment because it is not a '...

View answer
Inherent error in mass and volume?
1 votes

Is the percent error formula you are looking for something like the formula this website service offers? Your lab instructor should have given you the formula, perhaps you missed that. Do you have a ...

View answer
Can molecules diffuse upstream when emptying a cup of tea?
6 votes

was it those crazy tea fanatic Cuban scientists again? The particles can supposedly travel "upstream" if you were to say, pour it into your toilet as closely as your hand can get without a hazmat ...

View answer
Is there an alternative to the half-reaction method to solving red-ox reactions?
Accepted answer
8 votes

There is one other way that I have used, using a linear system to solve this reaction. Although it can be used for other more casual reactions too, such as the combustion of ethanol for example. As ...

View answer
What is the chemical structure / hybridization of sulfuric acid?
4 votes

I guess that an alternative way of asking this question is what is the hybridization of H2SO4? A better way to ask this might be: "What is the hybridization of the sulfur atom in Hydrogen Sulfate?" ...

View answer
Do dishwashing detergent and stain remover powder/stick have the similar ability to remove collar rings?
Accepted answer
2 votes

Detergents seem to consist of both polar and non-polar compounds. Probably because they need the non-polar part of the mixture to dissolve the grease, and the polar compound part of the mixture to get ...

View answer
Are words on my T-shirt removable?
1 votes

As you say, it appears to be a kind of paint? So perhaps if you get a razor or something sharp you could try scraping and it will probably come off eventually, that would be one physical way. On the ...

View answer