Tagged Questions

Applications of chemistry to reagents and reactions of everyday life.

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7
votes
1answer
746 views

Does bleach turn a substance white or colorless?

From what I understand, bleach works to weaken the ability of a substance to absorb light. Thus this seems to be "whitening" i.e. reflecting all light. In contrast, colorlessness (according to ...
0
votes
1answer
31 views

Why is NaCl insoluble in CCl4?

Now I know it's something related to the fact that $\ce{CCl4}$ does not have a net dipole moment but I can't connect the dots.
0
votes
0answers
28 views

How to balence this redox equation: Cu(NO3)2 + Al(NO3)3 -> CuO + Al2O3 + NO2 + O2? [on hold]

I am having aluminium and copper nitrates and want to dissolve them in the distilled water, and I want to know what is the (balanced equation)reaction between them! $\ce{Cu(NO3)2 + Al(NO3)3 -> ...
0
votes
1answer
77 views

How much energy is required to raise the temperature of a 34.4g Al bar from 20.0 to 35.5 degrees celcius? [on hold]

How much energy is required to raise the temperature of a 34.4g Al bar from 20.0 to 35.5 degrees celcius?
-1
votes
0answers
17 views

Why doesn't ground level ozone rise to the stratosphere? [on hold]

Relate to relevant scientific theories, laws and research. Discuss what would occur to the ozone that is released at sea level (include calculations if possible).
-1
votes
0answers
14 views

How much energy is required for this process? [closed]

In an experiment, 10.0g of ice at -20 degrees C is converted into liquid with a temperature of 60 degrees C. How much energy is required for this process? (∆Hvap= 2260 J/g; ∆Hfus= 334 J/g; ...
-2
votes
0answers
31 views

Rank the following compounds from least conductive to most conductive [closed]

Rank the following compounds from least conductive to most conductive. 2 M $\ce{CaCO3}$, 2 M $\ce{AlCl3}$, 4 M $\ce{CH3COOH}$, & 4 M $\ce{C6H12O6}$
1
vote
1answer
41 views

Finding compounds with B, Si, Ca, and Mg in differing amounts

Not sure if my question is better suited to a software related group, but here goes: Is there a software program that lets you add differing amounts of elements, minerals, etc., then tells you what ...
0
votes
1answer
26 views

Will lye damage vinyl pool liners?

I have a nutty neighbor that said someone told them to put liquid lye into their above ground pool. I said it would eat away the lining, their answer was to only use a little bit.
2
votes
1answer
49 views

Precautions and tips for Qualitative Inorganic Analysis of Coins

I'm a highschool student and as part of an investigatory project, I have decided to analyse which metals are present in our everyday coins. I chose this because in my previous academic year, I had ...
2
votes
1answer
40 views

Element letters

Does it change the compound if the element letters are switched? ex. HO or OH. Are those two different compounds or are they one in the same? This may be a simple question or I may have incorrectly ...
0
votes
0answers
6 views

question regarding what i can put in category of homework questions [migrated]

I just wanted to know that if I am unable to solve a particular question that is completely unable even to start up with the question and i put it on this site without showing any effort because i ...
7
votes
2answers
1k views

Beer freezing after being opened

I am watching the Stoke vs Swansea, and to be honest, it's pretty boring. So much so, that I've started to wonder why it is that my beer has turned into a slushy after being taken out of the freezer. ...
1
vote
1answer
41 views

Applying the Solubility Guidelines is AgClO4 soluble or insoluble?

The book I am using is "General Chemistry: Principles and Modern Applications by Ralph H. Petrucci. On page 158 the Solubility Guidelines for Common Ionic Solids is given. Rule 3 states that, "Salts ...
0
votes
2answers
39 views

Which Solution has the highest total molarity of ions and why?

(a) 0.008 M $\ce{Ba(OH)2}$ (b) 0.010 M $\ce{KI}$ The answer is "a" but I do not understand why. The book says that "a" is a strong electrolyte with a total ion concentration of 0.024. How did they ...
0
votes
1answer
28 views

(NH4)2 SO4 (aq) + ZnCl2 (aq) ---> Using Solubility Guidelines to Predict Precipitation Reactions

The question ask whether a reaction will occur in the following case. If so, write a net ionic equation for the reaction. $\ce{(NH4)2SO4 (aq) + ZnCl2 (aq) ->}$ The book says that all possible ...
1
vote
2answers
52 views

Moles of a concentration?

I am having a problem wrapping my mind around the idea that in 230 ml of 0.615 M $\ce{KCl}$ there is 0.141 moles of $\ce{Cl^-}$. I guess I still do not understand moles. Is this calculation saying ...
0
votes
2answers
36 views

What form of zinc's found naturally in vegetables & meat?

What kind of zinc naturally occurs in plants? Zinc oxide, zinc sulphide, or something else?
2
votes
1answer
38 views

Chemicals to clean natural stones

I picked up some stones from a hiking trip. What can I use to thoroughly clean the mud and other hard deposits on the surface of the stones? I have only washed them with plain water.
3
votes
1answer
51 views

What chemical will dissolve the plastic coating on circuit boards

I'm trying to reclaim the metals on circuit boards and the vast majority is underneath the plastic coating. It is a brittle plastic that chips off in small flakes when etched but that process will ...
0
votes
0answers
47 views

Is it dangerous to live near lead? [duplicate]

Several month ago, I soundproofed the door of my room with two sheets of lead. Can it be dangerous to live with them for many years? Can lead "decay" in some way and be inhaled? (and what happen when ...
1
vote
1answer
91 views

Can the product be called “vinegar”?

For a product to be called "vinegar", it must contain at least $5.0$% acetic acid by mass. A 10.0 g sample of a "raspberry vinegar" is titrated with $0.125 \mathrm{M}$ barium hydroxide and required ...
7
votes
2answers
71 views

Standard list of odors?

Is there such a thing as a list of "standard" odors? In everyday context, there are various descriptions to odors such as "fruity" and "plastic-like". But are there more accurate and normalized ...
0
votes
2answers
57 views

Stoichiometry & Solutions Problem

Hello I am taking college level Chemistry in high school. My teacher isn't very good at helping me solve this problem, so I found this amazing website. I just have one question. I keep getting the ...
2
votes
2answers
72 views

How to dissolve candle wax (parafin)?

Wikipedia states, that waxes can be dissolved by non-polar organic solvents. But I failed to disolve candle wax in both acetone and ethanol, which are the only organic solvents I have at home. I have ...
0
votes
0answers
22 views

Relation between vapor pressure and density

Why does organic compound having high vapor pressure have less density than even water? Prologue: I had a drum (non-pressurized) of 200L of Vinly Ester for Glass fibre piping and I assumed that the ...
0
votes
1answer
32 views

Heat Absorption of Liquids

Does same amount of heat absorbed cause the same changes of temperature in the same amount of different liquids? Explain.
1
vote
1answer
65 views

Prevent molten glass from cracking when cooling down

My mother works in a ceramics workshop. Besides giving lessons she creates various ceramic dishes, cups and plates. She often uses the effect of colored glass melting in the product and then leaving ...
1
vote
1answer
65 views

Complete the following reactions and write the spectators for each if any

A.) cobalt (ii) chloride (aq) and cesium phosphate (aq) I am not quite sure if I have the correct answer to this equation, but I have $\ce{ CoCl2(aq) + Cs(PO4)(aq)}$ (for the equation setup) and for ...
2
votes
1answer
37 views

Simple and cheap anti-graffiti layer based non-paint solvent

I have this issue with a group of people intentionally damaging a bench. So far, they would paint curses over the bench with permanent marker. However after I removed the curses with ethanol, they ...
3
votes
1answer
44 views

Regarding preservatives in food

Can sugars like fructose-glucose or high-fructose corn syrup that are found in many types of processed food contribute to shortening a products shelf life? Don't bacteria love things like sugar so if ...
-1
votes
1answer
47 views

What is the Natural abundance of Potassium

The three naturally occurring isotopes of potassium are $\ce{^39K}$, 38.963707 u; $\ce{^40K}$, 39.963999 u; and $\ce{^41K}$. The percent natural abundances of $\ce{^39K}$ and $\ce{^41K}$ are 93.2581% ...
3
votes
2answers
105 views

How many grams of NaHCO3(s) will be consumed?

Excess $\ce{NaHCO3_{(s)}}$ is added to 510 mL of $\ce{Cu(NO3)2_{(aq)}}$ 0.240M for the reaction $\ce{Cu(NO3)2_{(aq)} + 2NaHCO3_{(s)} -> CuCO3_{(s)} + 2NaNO3_{(aq)} + H2O_{(l)} + CO2_{(g)}}$
0
votes
2answers
36 views

Is this a Solution Dilution Question? [closed]

How much glucose, $\ce{C6H12O6}$, in grams, must be dissolved in water to produce 53.0mL of 0.375M $\ce{C6H12O6?}$ If so, how do I set it up?`
2
votes
2answers
72 views

Why is K2CrO4 Potassium chromate?

I was given $\ce{K2CrO4}$ and was asked to name the compound. Can this be done by: 1) Determining the molecular compounds oxidation state or 2) Does one need to memorize the polyatomic ions and ...
2
votes
3answers
105 views

Oxidation State of Oxygen in Na2O2?

I am asked to determine what is the O.S. of Oxygen in $\ce{Na2O2}$ I was under the impression that oxygen had a charge of -2 and I multiplied that charge by 2 giving me an Oxidation # of -4. ...
5
votes
3answers
117 views

Are radioactive isotopes of silver dangerous?

I know we all think of things like uranium as being radioactive in the nasty radiation poisoning sort of way. But do elements like silver have similar effects in their radioactive isotopes? I'm an ...
1
vote
1answer
42 views

Establish the Formula of This Compound

An oxide of chromium used in chrome plating has a formula mass of 100.0 u and contains four atoms per formula unit. Establish the formula of this compound, with a minimum of calculation. Express your ...
2
votes
1answer
47 views

How does potassium nitrate work as an oxidiser?

Potassium nitrate is very popular compound in pyrotechnics, used as an oxidiser. It can be mixed with sugar to make a "rocket candy", with coal and sulphur to form black powder. You can stick it on ...
10
votes
2answers
132 views

When I dissolve sugar in my cup of tea/coffee, does it become a liquid or gas, or neither?

When I dissolve sugar in my cup of tea/coffee, does the sugar go from being a solid to being a liquid or a gas, or neither? Related: What keeps the sugar suspended in the tea?
0
votes
1answer
67 views

Which Value is Greater?

Indicate which of the following quantities contains the greatest number of atoms and why? a) $6.022 \times 10^{23}$ Nickel atoms b) $25.0$ $\mathrm{gm}$ of Nitrogen c) $52.0$ $\mathrm{gm}$ of ...
0
votes
1answer
46 views

How do you solve a net ionic equation without a balanced equation?

In class, my professor went over a method for finding the net ionic equation without determining the balanced equation (e.g., if finding the balanced equation was too difficult for us students). It ...
5
votes
1answer
87 views

Why is sugar used in low-cost homemade rockets?

I was thinking about making a "rocket candy". It's relatively inexpensive rocket based on sugar and some oxidiser, mostly $\ce{KNO3}$. The fuel is usually formed by heating the mix of both compounds ...
4
votes
2answers
186 views

What is Chevron with Techron fuel?

I've heard the commercials for this stuff for years, but what exactly does it do? Does it do what the commercials say it does (clean out deposits in your tank)? How well? In other words, is this ...
6
votes
3answers
1k views

Which chemical is responsible for making marker ink permanent?

As asked in the question and also, a bonus question: which property of a chemical would make it 'permanent' in terms of markers?
1
vote
2answers
40 views

Does Carbon dioxide smells “cold” [closed]

It may be a strange question. But, whenever I smell my roasted coffee,the air in the alloy smells "colder" than the air in the kitchen. Is it due to $\ce{CO2}$ degassing in the first days after ...
0
votes
2answers
51 views

Using the Law of Constant Composition: Magnesium and Oxygen Mass

What masses of magnesium and oxygen must be combined to make exactly 2.000 g of magnesium oxide? Magnesium's atomic weight is 24.305 and Oxygen's atomic weight is 15.999. Do I simply add the two ...
1
vote
1answer
41 views

How many grams of acetic acid are present in 2.80L of this vinegar?

A vinegar sample is found to have a density of $1.006 \mathrm{\frac{g}{mL}}$ and to contain $8.7\%$ acetic acid by mass. I multiplied $(\frac{1.006~\mathrm{g}}{\mathrm{ml}})\cdot ...
6
votes
2answers
69 views

Why N2O is a “laughing gas”?

It is (mostly) used as an "oxidizer" in motors and engines, I understand that much. The oxygen "oxidizes" with other chemicals, while the nitrogen returns to the air. But $\ce{N2O}$ also produces ...
2
votes
1answer
37 views

Using Conversion Factors

In Europe, gasoline efficiency is measured in km/L. If your car's gas mileage is 35.0mi/gal , how many liters of gasoline would you need to buy to complete a 142-km trip in Europe? Use the following ...