Chemistry Scavenger Hunt 50 items

Yomomma · Probably a bot. Joined: 17 May 2006 Posts: 1

dude man i have here sum answers for u Whine bags that dont like work:
#1 a mole of anything..blah blah blah i just got 106 grams of Baking soda to show the work u have to calculate the amu of Na, C, and O to grams and then add them to get 106 grams

#5 A weak arrhenius acid: CH3COOH is one
#6 a weak arrhenius base: Um Ammonia works, Lithium Hydroxide which u can find in lithium batteries like in watches or calculators, also Mg(OH)2 works
#7 i know Dry Ice can be used for this but im not sure how u can turn that in...thats what im trying to figure out
#11>> Hetero. Mix: baking FLOUR or Dirt ..you figure out the rest
Homo. Mix: Sugar is what i used
#13 easy go to nobelprize.org and u'll find them there
#15 Rust
#16 Copper wire
#17 go find a Helium Balloun
#18 CaCO3: steal sum chalk from ure teacher
#21 either regular vinegar or ethanoic acid the thing used for making vinegar
#22 Glass or Sand
#23 Water
#25 i think NaCl works for that
#28 any kind of cooking oil Corn oil works best
#31 toothpaste
#33 Cement has it
#35 if u can get ahold of KI ....PIME its sum thing used to treat the thyroid
#38 Carbon you can get that from charchoal or graphite
#39 lemon juice: Citric acid
#43 anything in the carbon or nitrogen family
#44 epsom salt
#45 Isopropyl alcohol = rubbing alcohol
#48 H2O2 hydrogen peroxide

URE WELCOME ..well good luck findin the rest i have to turn mine in this friday...i wasnt able to find them all so i hope i made ure life easier!! Smile

toesmice2 · Posted: Thu May 18, 2006 12:16 pm Post subject:

yoo dude thanks so much man ur the best woohoo.....where do u go to school....NJ?

toesmice · Posted: Fri May 19, 2006 11:53 am Post subject:

Dude...that's not cool...You're a freakin name stealer!! Thanks for the answers by the way.

Lou1024 · Regular Joined: 04 Dec 2005 Posts: 82

toesmice · Posted: Sat May 20, 2006 10:56 pm Post subject:

That's because it's my friend in school who's using a computer linked to a central computer I guess...He's an idiot, lol.

toesmice2 · Posted: Mon May 22, 2006 11:48 am Post subject:

i am the better toesmice....i got all my answers from toesmice 1 tho......hes holding out.

Rebecca · Probably a bot. Joined: 06 Jun 2006 Posts: 1

Can anyone share with me the answers for numbers 2,3,4,8,9,10,12,14,20,27,29,32,36 please and thank you Smile

kristoph · Junior Member Joined: 06 Apr 2007 Posts: 8

Just wondering if anybody worked out the answer for #50? I got an answer but would like to confirm my calculations. I got 5.096g of NaCl.

Thanks

Hix3r · Regular Joined: 24 Apr 2007 Posts: 43 Location: Hungary

Don't read this unless you are lazy.

#1 6.02*10^23 is exactly one mol of any substance.

#2 1 L, I hope L stands for litre... 1 litre= 1 dm^3 so the cube's dimensions are 1 dm x 1 dm x 1 dm

#3 1 mL is 1*10^-3 L so --> 1*10^-3 dm^3 the cude's dimensions are 0.1 dm x 0.1 dm x 0.1 dm

#4 I don't know what indicator you used in your class, but a great natural indicator if I remember correctly is red cabbage. You can extract the indicator from its leaves and in bases it turns blueish, acids it gets sort of red. anyway I suggest you try it, I'm not sure Very Happy

#5 As well said before an Arrhenius acid is a substance which when dissolved in water increases the H+ amount. And a weak acid is an acid which does not dissolve completely in water. Example is Carbonic Acid, It's really really weak, some say does not even exist in this form H2CO3

#6 An Arrhenius base is a substance which when dissolved in water increases the OH- amount. A weak base is a base which does not dissolve completely in water. Example is ammonia.

#7 I don't really get this question.. it's phisics... what does it mean under phases? liquid, solid, gas or what?

#8 A chemical equilibrium is a state in a balanced equotation when the same amount of ingredients are made and during this, the same amount of products disintegrate into the starting substances. I like to use the N2 + 3 H2 <-> 2 NH3 example but since it calrifies that two phases must be present, well I don't know if CO2 + H2O <-> H2CO3 can be accepted.

#9 .......

#10 the ratio is 0.05 : 1 in mol... so to really make it I would get 20 mol H2O and 1 mol of substace. That's 360 g H2O and for example 106 g Na2CO3 but any substance is good which is soluble is water.

#11 OK. I did not really came across with this one yet in my life, but I think here you should include a solution like Na2CO3 in water, and try starch and water fro heterogenous system. If you want to seem like really smart you can just use the starch and water say it's heterogenous and then start to heat it, because starch dissolves in hot water, then you tell them now it's homogenous.

#12 2.3 g Na is exactly 0.1 mol 0.56 L = 0.56 dm^3 Cl2 and STP is 24.5 dm^3/mol so 0.56 dm^3 is approx. 0.023 mol so:
2 Na + Cl2 -> NaCl
It's clear that we have much more sodium, so the amount of NaCl will be based on the amount of chlorine. The equation says 1 mol Cl2 makes 1 mol NaCl so we have 0.023 mol than we will make 0.023 mol NaCl which is 1.35 g approximately.

#13 OMG I hate this... use Wikipedia and you should be fine...

#14 i know one for sure: lead-acetate is way beyond 1... Tricky thing:
(CH3COO-)2Pb2+ the first 2 is lowercase and the end 2+ is uppercase because you cant just make them one substance these are two ions together, you must indicate what is positive and what is negative.

#15 Fe2O3 called rust or iron(III)-oxide...

#16 29 protons says that it's the 29th in the periodic table. So it's cuprum or common name copper.

#17 Inert gas refers to that this substance does not take part in a reaction. All of the noble gas group in the periodic table is a good example, although there are some exception like XeF4, but it's very rare.

#18 A Bronsted base ina reaction is the one who GETS a proton(H+) so any substance which gets one in the reaction is a base, no matter anything else. In this reaction for example the base is ammonia:
NH3 + H2O <-> NH4+ + OH-

#19 Product is oxigen for example and the reaction is:
2 H2O2 -> 2 H2O + O2
Here the oxigen changed it's oxidation number both ways two of them took part in reduction so from -1 they went to -2 and the other to went to 0.

#20 Okay, easiest way, in you put table salt into one container and water into the other. Problem solved. NaCl is ionic actually it's Na+Cl- and H2O is covalent: H-O-H. I can't show the V-form here.

#21 Common name: vinegar, and it's ethanoic acid.

#22 Silica, silicium dioxide, found in quartz, opal but most importantly SAND.

#23 Polar molecules have sides with different charge. So water is polar, so is etanol, etc.etc.

#24 OK. Silicium is one of them, also Antimony. Si, and you should draw a thing like the carbon atoms in a diamond.

#25 Very handy one. Common table salt is good, that is why people salts the streets during winter, takes the waters freezing point lower so it does not freeze in the cold therefore no ice.

#26 My favourite. Endothermically potassium nitrate dissolves with a buch of other substances I forgot about. So KNO3 and done.

#27 In alkanes anything that has more carbon atoms than 7 is good.

#28 Nonpolar molecules are ones without different charges on the sides of the molecule or they are symmetric. Great nonpolar molecules are elements, like Br2, and hydrocarbons like methane CH4.

#29 This is phisycs! And I'm bad at it.

#30 I think I already defined equilibrium. So H2CO3 is a very unstable thing. It dissolves in two steps:
H2CO3 + H2O <-> HCO3(-) + H3O(+)
HCO3(-) + H2O <-> CO3(2-) + H3O(+)
So the system containing these molecules should reach equilibrium where the same amount is created from the products and during the same amount disintegrate into the starting materials.

#31 Actually I think this is called toothpaste... Anyway in toothpaste there is NaF in very little amounts not to be toxic.

#32 Very weak organic acid is stearic-acid. A weak organic acid is an organic compound which acts like an acid is reactions and does not dissolve completely in dilute solutions.

#33 Common white paint.

#34 Ca(OH)2 for example. Calcium-hidroxide and sorry but I only know the common name in my language.

#35 Ok. Table salt, or if you want to make it little more interesting, potassium-iodide is great too, KI.

#36 All I know about this, is that it's useful separating amino-acids, can't say I know more sorry.

#37 I don't really get this question... Maybe Titanium is acceptable?

#38 Nonmetal are material that does not form a metal grid structure when solid. Example is oxigen, O2, or carbon C.

#39 Electrolytes can be solutions and liquidified materials. They point is that it has to have charged particles that can move freely, so they lead electricity. For example an NaCl solution is an electrolyte and liquid NaCl is an electrolyte too, the thing is during electrolysis, not the same things appear on the cathode and on the anode.

#40 Sorry but I can't help with this one.

#41 Only thing I can think of is this:
CaCl2 + Na2CO3 <-> CaCO3 + 2 NaCl
calcium-carbonate and sodium-chloride are the products. calcium-carbonate is not soluble so it will become solid.

#42 Hmm. I forgot this... Anyway seems you got it.

#43 Carbon-dioxide follows this rule I have never heard of until this day.

#44 I saw the answers, but I think the simple the better, so CuSO4 * 5 H2O copper-sulfate petahydrate, this is what the material is so great looking blue, therefore also called Bluestone.

#45 Common name?... isopropyl-alcohol? Anyway CH3-CHOH-CH3

#46 0.3 mol Na2CO3 is 31.8 g what calculations are there?

#47 Polymer is the famous one, polyvinylchloride also called PVC. There is a vinyl-group two carbon atoms one has two one has one hidrogen and between them is a double bond. CH2--CH This is vinyl group, and probably you noticed there is one hidrogen missing, so there goes the chloride-group. During polymerisation the double bond breaks up and each of the carbon atoms form a new bond with another vinyl-chloride molecule. This goes forever and more, and you get a big macromolecule, PVC.

#48 Oxide of an element. SiO2, CO2, NO2, SO2, and the list goes on. Be careful with alkali metals, they tend to form unsusual oxides.

#49 Mg(OH)2 + H2SO4 <-> MgSO4 + 2 H2O
magnesium-sulfate, epsom-salt, whatever.

#50 Pretty easy calculations. Excess of acid means that the amount of product will be based on the sodium hydrogen carbonate.
NaHCO3 + HCl -> NaCl + CO2 + H2O
10 gramms of shc(sodiumhydrogencarbonate) is 0.12 mol but we must apply a 75% yield so 0.09 mol shc takes part in the reaction. Great this was the hard stuff, we can see from the equation, that one mol shc produces one mol natrium-chloride, so 0.09 mol of shc produces 0.09 mol of sodium-chloride, and 0.09 mol sodium-chloride is 5.26 gramm.

I just found this site on Google, and I thought I test myself a little bit. Please forgive me for my bad english, because I'm Hungarian, and many many many of the english substance names and common names are different. Also a lot of expressions in chemistry are not the same. Like here natrium stands for sodium a kalium for potassium. I had some trouble explaining this like the "charge of the molecule" and I am really sorry. I hope you understand. Anyway feel free to correct my errors, I'm sure there are a lot of them, most of the answers I remembered, so I can be wrong, I did not check every answer on the net. And I did not give answer to some questions.
I know that lot of these were answered before, I just wanted to make a summary kind of thing, so anyone can correct this, correct me, I happen to be just before the exam of my life, this exam decides if I can go to university or not, and I take this exam from biology and chemistry. So please correct me, I must know where I am wrong.

Good questions by the way. I would have enjoyed it better with a little more calculations. Very Happy

Lou1024 · Regular Joined: 04 Dec 2005 Posts: 82

Thanks for posting the rest of the answers, Hix3r, and welcome to the Forums!