priekaparki

Hi,

We can often see the same household appliances in Europe, Asia or America even though the voltage is different.
They don’t use a heavy voltage converter, so what element is changed in the appliance in order to use it anywhere ?

Thanks

As the supply voltage differ at thes places the the voltage has to be stepped up or down depending on the supply voltage.

It is done by a step up or down transformer or by smps (switch mode power supply)

In some appliances it is built inside and the selection of voltages is done by a switch.

It’s for a science project. I need one common household item that has a pure element in it. It can’t be a compound. I’ve already used: potassium
phosphorus
iodine
chlorine
sulfur
calcium
iron
magnesium

It has to have the element on the ingredients list or packaging. Please try to be as specific as possible.

Thanks!

This is tricky. I couldn’t find any household item that contained elemental chlorine because it is a gas and is considered poisonous.

Phosphorus – red phosphorus is used to make the striking strip of matchboxes
Iodine – a disinfectant when added to ethanol or added to sodium iodide, ethanol, and water
Sulfur – ingredient in acne treatments
Calcium – used to make cheese, where its ions influence the coagulation of milk; also used in cements and mortars in construction
Iron – used for building… a household item would be a cast iron skillet, cast iron stove, etc.
Magnesium – in a cell phone, laptop, or computer

To go from there, I would suggest looking at specific packages of some of the things I listed and seeing if they include it on the packaging. If not, you may have to do some further reasearch, like on the process of making cheese or making a cell phone/laptop, etc. that may confirm that the pure element is contained in the product.

Good luck with your project!

I’ve been studying for my chemistry quiz tommorrow and i just cannot figure out how I’m supposed to know the difference between -ites and -ates. I know that the -ate suffix is used for the most common oxyanion of an element, but how do I find out what that is? Do I just have to memorize which oxyanion is the most common for each element?

Also any other tips for remembering nomenclature would be appreciated. The quiz will be on naming anions, cations, ionic compounds, acids, and binary molecular compounds. Thanks!

The -ate ending is not always the most common, just the most oxidized.

There are too many exceptions to the rules to come up with a reliable way to know the names of the oxygenated non-metal anions. I highly suggest using flash cards to drill yourself on the names and chemical structures of the common multi-atomic ions.

This will ensure that you can immediately picture the formula from the name or the name from the written structure.

NH4+ as Ammonium and
[HCO3]- as Bicarbonate or Hydrogen carbonate can often be overlooked otherwise.

There are also sequences like the Phosphates
[H2PO4]-1
[HPO4]-2
[PO4]-3

I know you have to go backwards to the noble gas nearest to the element and then you write [ ] and put the noble gas symbol in the brackets. The thing I don’t understand is how do you then write the electron configuration left?

Please give me an example for the element "silver".

Thanks. I’ll give 10 points to the most helpful answer.

You go back to the Noble Gas before it and use that configuration and just tack on, at the end, the part that was not included in that Nobel Gas’s configuration.

In silver, the configuration goes as follows:

1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s1

However, since the Noble Gas before it already contains the first half of the configuration (1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6), you just use the Noble Gas and add on the part that Noble Gas does not have. Which results in Ag’s configuration looking as follows:

[Kr] 4d^10 5s^1

What three things does the atomic number of an element tell us?

Also, what are the majority of the elements on the periodic table classified as?

The atomic number is the number of protons; in a neutral atom, it is also the number of electrons; it also identifies an element.

Most elements are metals.

What three things does the atomic number of an element tell us?

Also, what are the majority of the elements on the periodic table classified as?

The atomic number is the number of protons; in a neutral atom, it is also the number of electrons; it also identifies an element.

Most elements are metals.

We had a quiz today and it asked for these 2 in a question and it also asked for what element was being reduced and the reducing agent. Anyone care to explain the difference as I thought they were the same.

The element being oxidized is the reducing agent.
The element being reduced is the oxidizing agent.

Im trying to find out what element has five electrons in its outer energy level. And what element has an energy level configuration of s2 p1?

Gotta disagree with flameboy – Lithium does not have any p electrons

I assume that they mean 2s2 2p1 which is boron.

Do I divide it by the volume and that gives me the mass which would help me find the element?

The Density is 8.2 g/cm^3 and the volume is 1.04 ml, I found the mass to be 8.5 grams, would that be Beryllium, even though Beryllium’s mass is over 9? Please help?!
Thanks!

You are confusing mass and density. If the thing you weighed consists of a pure element and it is 100% dense (does not contain any air pockets or closed holes), then the density should be very close to the density published for one of the elements. The atomic mass is a different thing than the bulk density. Mass is in units of grams or lbs (or atomic mass units). Density is in units of mass per unit volume, grams per cubic cm or lbs per cubic inch.

I hope this helps

I want to install a solar powered heating element in my hot water tank. I want a very simple system with out batteries or thermostat control. Basically convert solar power to electricity & send directly to the heating element which is fitted to my water tank.

1] Has anyone any experience of such a set-up?
2] Any advice on this system- what to do & what not to do?

The technology to convert solar power to electricity to heat water is very inefficient. Solar photovoltaic panels are expensive. You should think about using solar panels to heat water then circulate that through your hot water heater. There are dozens of firms in your town who can install a solar water system for you. If you are good at plumbing you can probably do this yourself.

This might give you some information:
http://www.solarexpert.com/Heatdhw.html