Applications of chemistry to reagents and reactions of everyday life.

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1answer
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what is the white fuzz left behind on basement floor after puddle evaporated

My basement is quite dry (knock on wood!). Recently I brought into the basement for the winter a table from outside. The table had some ice stuck to it which I couldn't remove, so I simply let it ...
1
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1answer
12 views

Neutralizing sulfur-like smells in car

A full bottle of jewelry cleaning (links product and material safety data sheet below) broke in my car and went unnoticed for a few days. Now the car has a sulfur-like smell whenever I go into the ...
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1answer
22 views

Aspartame poisoning: Can it modify aminoacids?

I just accidentally closed a webpage (and did not find it later) which described that somehow, Aspartame poisoning victims had faults in the vital proteins of their body due to the reaction of ...
9
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3answers
871 views

Why is methanol toxic?

There are two points of view for the answer of this question: The biological view, the only one that I faced during my research, states that since it can trigger perilous conditions like metabolic ...
2
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1answer
20 views

How does grease become airborne?

When cooking in the kitchen you usually use some oil or butter to bake your meat and potatoes in. After some weeks without cleaning (which happens every now and then) the surroundings of the stove ...
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17 views

Chemical Thermodynamics

In this pic, you can see the report for lab work. I did the labwork, and it is asking -to find delta H pr -? -delta H (theor)-? -error ? Please help me to find those
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26 views

Electrochemical Corrosion and its reaction [on hold]

Tin metal is in contact with copper metal and both are put in moist air. Give the scheme of electrochemical corrosion and write equation for the reactions that occur.
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1answer
18 views

Galvanic Cells, theoritical voltage [on hold]

This reaction proceeds in the galvanic cell: $$\ce{Zn + Pb^{2+} -> Zn^{2+} + Pb}$$ I need the equation for the half-reactions of this cell and the theoretical voltage produced by this cell if ...
5
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2answers
60 views

Why does microwave heat up things so much more quickly than visible light?

I wonder why microwave has more "energy" to heat things up than visible light does. Microwave has a much longer wavelength, therefore should supposedly has less energy than visible light. But does ...
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0answers
15 views

Is there a substance that would react with seawater to produce a dense, insoluble, nonporous precipitate?

Is there a substance that would react with seawater to produce a dense, insoluble, nonporous precipitate? Alternatively, is there a hygroscopic substance that will absorb water and expand into a ...
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18 views

How to find the mass of each products produced [closed]

$$\ce{16 HCl(aq) + 2 KMnO4(s) 2 MnCl2(aq) + 8 H2O(l) + 5 Cl2(g) + 2 KCl(aq)}$$ The reaction of hydrochloric acid with potassium permanganate is described above. 153.33 g of hydrogen chloride is ...
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1answer
19 views

A mixture of 0.140 moles of C is reacted with 0.117 moles of O2 in a sealed, 10.1 L vessel at 500 K, producing a mixture of CO and CO2 [closed]

$0.140$ moles of $\ce {C}$ reacts with $0.117$ moles of $\ce {O2}$ in a sealed, $10.1~\mathrm{L}$ vessel at $500~\mathrm{K}$, producing a mixture of $\ce {CO}$ and $\ce {CO2}$. The total pressure is ...
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1answer
13 views

A 4.00 L sample of gas is cooled from 67 °C to a temperature at which its volume is 2.60 L [closed]

A $4~\mathrm{L}$ sample of gas is cooled from $67~\mathrm{°C}$ to a temperature at which its volume is $2.6~\mathrm{L}$. What is this new temperature? Assume no change in pressure of the gas.
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14 views

What is ΔH for the reaction [closed]

42-Given this data $\mathrm{AZ_3} \to\mathrm{\frac12 A_2 + \frac32 Z_2}$ , $Δ\mathrm{H} = 46\, \mathrm{kJ}$ , $\mathrm{2Z_2 + X_2}\to\mathrm{2Z_2X}$, $ΔH =-484\, \mathrm{kJ}$. What is $\mathrm{ΔH}$ ...
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16 views

which reaction corresponds to the value of enthalpy of formation ΔHt for Al2O3(S)? [closed]

which reaction corresponds to the value of enthalpy of formation ΔHt for Al2O3(S)? (A) Al2(g)+O3(g)---> Al2O3(S) (B) 2Al(S)+3O(g)---> Al2O3(S) C) 4Al(s)+3O2(g)--->2Al2O3(S) (D) 2Al(s)+3/2O2---> ...
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18 views

Calculating heat from ΔH [closed]

I am stuck in this problem please help me. what is the heat $Q$, when $25~\mathrm{g}$ of acetonitrile $\ce {CH3CN}$ reacts completely with excess water? $\ce {CH3CN(l) + 2H2O(l)->CH3COOH(aq) + ...
0
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1answer
24 views

what mass of Ca(OH)2 would be required to neutralize 120.0 mL 0f 0.350 M HCLO4? [closed]

Please help me in this question what mass of $\ce {Ca(OH)2}$ would be required to neutralize $ 120~\mathrm{mL}$ 0f $0.35~\mathrm{M}$ $\ce {HClO4}$ ? $\ce {2 HCLO4 + Ca(OH)2 ->Ca(ClO4)2 + 2H2O}$
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1answer
20 views

Find the percentage yeild

Plz help me i am totally confused when 8.70 g Al reacted with excess O2, 12.8 Al2O3 was obtained, what was the percent yield? Here is the balance equation 4Al+3O2--2Al2O3
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1answer
10 views

Specific heat capacity of two different metals

Tow metal sample, $X$ and $Z$, of the same mass and initially at $25 °C$, are heated so that each metal receives the same amount of thermal energy, which metal will have the highest final temperature? ...
0
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1answer
15 views

what volume of water must be added to 28.0 mL of 1.25 M FeCl3 to prepare a 0.650 M FeCl3 solution?

Help me please. What i tried is 1.25/0.650*28=53.8 is that correct?
3
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1answer
38 views

Does baked bread have the same amount of calories as its ingredients?

I bake a loaf of bread containing: 500g strong flour (1700 kcal) 40g butter (300 kcal) 24g yeast (80 kcal) For a total of 2080 kcal. How many calories does my finished loaf contain? My ...
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1answer
24 views

Why does a smaller amount of propanol burn slower than a much larger amount?

Why does $30~\mathrm{mL}$ of $\ce{C3H7OH}$ burn in 1 second (inside a water jug) compared to a sixth of the amount: $5~\mathrm{mL}$ of $\ce{C3H7OH}$ (on a plate) burn in 180 seconds? Why does the ...
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1answer
35 views

Elements of paper

I learnt that everything is made up of atoms even paper! After that, I was thinking what are the elements that made paper? Is there any chemical symbol for paper in general?
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40 views

How to find the mass of the solute given a concentration as a mass fraction?

Formalin is a $37\%~\mathrm{W/W}$ solution of methanal in water. What mass of water must be added to $250~\mathrm{g}$ of methanal to make formalin. Here's what I've done so far. It's wrong ...
3
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1answer
58 views

What governs the merging of globs of inmiscible liquid?

If I add a small amount of chloroform to a bunch of water, it falls to the bottom as a glob. If I shake the container vigorously (being carefully not to spill any of the dangerous substance!), the ...
6
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1answer
301 views

What Causes there to be a Maximum Amount of Salt which can be Dissolved in Water?

When you add salt to water and stir, after a while the salt will no longer dissolve. Why is this?
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1answer
29 views

Why isn't washing up liquid dry

Washing up liquid is wet and it is added to water. Why does it not come in a half size package and you add the water yourself? In the same way washing powder is?
11
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1answer
103 views

Why is it that every snowflake is unique?

It's pretty hard to believe in around 4.5 billion years of this planet's existence, no snowflake pattern was repeated, and that's not including potential earth-like planets. Is there a proof to the ...
2
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2answers
39 views

Sunscreen or sunblock

When I went to the supermarket, I noticed that some of the product say sunscreen and some of them say sunblock. My question split into two part. 1) What are the different chemical substances use in ...
3
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1answer
31 views

Explanation for behavior of acetic acid in aquaponic/hydroponic systems?

Because aquaponics is hydroponics with fish & bacteria, options for adjusting pH are limited. Primarily people use phosphoric acid, hydrochloric acid, and nitric acid (heavily diluted). A less ...
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19 views

Balloon from float to sink?

Everytime I walk by the balloon stall, I know that they use helium to make the balloons float in the air. But my problem is why when I leave the balloon aside, the balloon sinks to the bottom. Is ...
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1answer
27 views

Antacid tablet is acid?

Doing a grade 9 experiment comparing the alkalinity of antacid tablets. Using bromothymol blue indicator. Dissolved tablets in both tap water and distilled water and in all situations antacid came out ...
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0answers
19 views

What home chemical can I use to make droplet lens?

I'm very interested in making homemade droplet lens, I want to know what home element can I use to cook them. Here's a video showing the process, with no further information: ...
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1answer
41 views

Electrochemistry (Spontaneous Reactions)

Determine which of the following pairs of reactants will result in a spontaneous reaction at 25 celsius? Pb2+(aq) + Cu(s) Ag+(aq) + Br-(aq) Li+(aq) + Cr(s) Fe3+(aq) + Cd(s) None of the Above. ...
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1answer
270 views

Do chemicals have an expiry date?

A bonus question would be, if so, why? Is it because it decomposes and hence the expiry date is calculated out?
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1answer
32 views

Any home made tricks to fill up a baloon that floats?

These days there are a number of fancy balloons available, some of them are very beautiful. As always, they loose their gas overtime and don't rise anymore. Some of those new type balloons appear to ...
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3answers
58 views

How to make permanent ink that appears after some time?

I'd like to ask, how to make permanent ink, that will be invisible when used, but after like 30 minutes it will appear (preferably dark color)? Thanks.
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Is hydrated calcium silicate a good anticaking agent?

I work in a salt production factory and I want to make a purchase for hydrated calcium silicate as an anticaking agent for salt. Is it a good anticaking agent for salt and what is the perfect ...
0
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1answer
24 views

Is it relevant to pursue a master degree or a doctorate when applying to a job in the petroleum field? [closed]

I have a few more questions of this type for an interview. ( University work ) Thanks in advance.
2
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1answer
45 views

Is purple paint more suspeciple to UV damage than other colors?

I was recently sorting some Mardi Gras beads. These are cheap plastic beads on strings, coated in cheap metallic paint. While sorting the beads into different colors, I noticed that the purple beads ...
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0answers
17 views

Thermal stability of barium peroxide and barium oxide

why is barium peroxide more thermally unstable than barium monoxide Do I answer it based on the bonding and structure?
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2answers
68 views

How ‘lively’ would this ‘health’ potion be?

I’ve stumbled across a rather peculiar recipe for a allegedly ‘health’ potion in a computer game, composed of an unspecified amount of each of the following: rust (iron oxide) saltpetre (potassium ...
5
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1answer
30 views

Cyanide from seeds breaking down in a pond

I have a large loquat tree that overhangs a pond. The loquat seeds apparently contain cyanide of some sort, so I'm trying to find the effect the seeds have when they fall in the pond. Over time I ...
2
votes
1answer
56 views

Soap versus Shampoo

Soap and shampoo are both cleaning agents in our daily life. Why is soap in solid form and shampoo is in a liquid form, though? Is it because of the chemical components inside them or another ...
2
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1answer
31 views

Can you eliminate cigarette smoke odor between walls?

If holes are made in dry walls is there a substance that can be sprayed in the walls to eliminate cigarette odor?
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100 views

Difference between white sugar, brown sugar and red sugar

I always get confusing why the appearance of normal sugar(the white one), brown sugar and red sugar are different although they are sugar. Is it because they each have different molecular formulae or ...
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1answer
57 views

What would be the reaction:if I put melting iron in normal water?

I know it's a very ordinary question.But I have to know it correctly. What would be the reaction:if I put melting iron in normal water?Will water be chemically changed?
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2answers
47 views

Difference between baking soda and baking powder

I learnt that the chemical symbol for baking soda and baking powder is NaHCO3. However, when I do a simple experiment which is put vinegar into both substances. I can get different observations. ...
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3answers
2k views

Does water have a smell?

I was washing my cup with hot water (without soap) and upon it nearing my nose, there was some sort of 'smell' (I lack a better word)- However the 'smell' differed when I was drinking just plain ...
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27 views

Grapefruit and sugar gelatin like substance

More or less I am trying to figure out how this reaction occurred, so I can reproduce it. On a plate I had an excess amount of sugar with a fair amount of grapefruit juice which was stuck to the ...