Chemistry - May 2007

What is the result of adding yeast to Glucose (C6H12O6)?
And what is the name of process of adding the yeast?

2007-05-14 08:29:24 · 5 answers · asked by beeboroachgoingon197 1

A filtrate, X, was reacted with NaOH until in excess.
What observations would have been made when the inferences were:
1. Al3+, Pb2+, Zn2+, Ca2+ present
2. Al3+, Pb2+, Zn2+ present

2007-05-14 07:21:12 · 1 answers · asked by beeboroachgoingon197 1

Mn ^2+ (g) + Fe3+(aq)  MnO4-(aq) + Fe2+(l)
Balance using the half reactions method.
^= up in the air not below

my answer:
Mn^2+ +Fe^3+ +H2O –––> MnO4^– + Fe^2+ +H^+

if it is wrong help!

2007-05-14 07:16:28 · 1 answers · asked by Anonymous

a. 748 mL
b. 1.73 L
c. 903 mL
d. 1.10 L
e. none of these

2007-05-14 07:14:38 · 5 answers · asked by Anonymous

yah what said in the question

2007-05-14 07:12:06 · 6 answers · asked by bullsi890 1

What is the temperature range for which the formation of iron from rust is spontaneous?

The equation is: 2Fe2O3(s) → 4Fe(s) + 3O2(g)

Taking into account: ΔG = ΔH – TΔS

ΔH°f = 1648.4 kJ

ΔS°f = 549.6 J/K

2007-05-14 07:10:48 · 3 answers · asked by theweirdguy1 2

a) is independent of pressure above solution.
b) decreases with increasing pressure above solution
c) increases with increasing pressure above solution
d) Solids are not soluable in water
e) none of the above

2007-05-14 07:07:38 · 0 answers · asked by Anonymous

2007-05-14 07:02:42 · 2 answers · asked by Anonymous

a)55.9
b)13.1
c)31.1
d)239
e) none of the above

2007-05-14 07:00:29 · 2 answers · asked by Anonymous

If the concentration of C+ decreases, the cell potential, Ecell , will (increase or decrease), because Q value for the reaction will (increase or decrease).

2007-05-14 06:53:38 · 2 answers · asked by Anonymous

2007-05-14 06:53:06 · 2 answers · asked by zerald 1

I need a great fusion experiement for chemistry class....any suggestion?

2007-05-14 06:52:06 · 2 answers · asked by Chris S 1

What do I need to do?

2007-05-14 06:45:43 · 3 answers · asked by Anonymous

Which letter corresponds to the correct balanced chemical equation in an acidic solution?,

A. 2Mn2+(aq) + 8H2O(l) + 5Fe2+(aq) ->5Fe(s) + 16H+(aq) + 2MnO4–(aq)
B. 5Fe(s) + 16H+(aq) + 2MnO4–(aq) -> 2Mn2+(aq) + 8H2O(l) + 5Fe2+(aq)
C. Fe(s) + 8H+(aq) + MnO4–(aq) -> Mn2+(aq) + 4H2O(l) + Fe2+(aq)
D. Fe(s)+8H+(aq)+MnO4–(aq)+Pt2+(aq) -> Mn2+(aq)+4H2O(l)+Fe2+(aq)+Pt(s)
E. Mn2+(aq)+4H2O(l)+Fe2+(aq)+Pt(s) -> Fe(s)+8H+(aq)+MnO4–(aq)+Pt2+(aq)

What reaction is occurring at the cathode?
Fe(s) I Fe2+(aq) II MnO4–(aq), Mn2+(aq) I Pt(s)


A. Fe(s) -> Fe2+(aq) + 2e–
B. Fe2+(aq) + 2e– ->Fe(s)
C. Mn2+(aq) + 4H2O(l) -> 5e– + 8H+(aq) + MnO4–(aq)
D. 5e– + 8H+(aq)+MnO4–(aq) -> Mn2+(aq) +4H2O(l)
E. Pt(s) -> Pt2+ + 2e–

2007-05-14 06:30:34 · 2 answers · asked by Anonymous

For the following balanced equation: 2 Ag+ (aq) + Cu(s) Cu2+ (aq) + 2 Ag(s)

Which letter corresponds to the correct cell notation at standard state conditions?


A. Ag+(aq) Cu2+(aq) Cu(s) Ag(s)
B. Cu(s) Cu2+(aq) Ag+(aq) Ag(s)
C. 2Ag+(aq) Cu2+(aq) 2Ag(s) Cu(s)
D. Cu2+(aq) Cu(s) Ag(s) Ag+(aq)
E. Cu(s) Cu2+(aq) 2Ag+(aq) 2Ag(s)

What reaction is occurring at the anode?


A. Ag+ + e– Ag
B. Cu2+ + 2e– Cu
C. Cu Cu2+ + 2e–
D. Ag Ag+ + e–

2007-05-14 06:22:31 · 3 answers · asked by AnDru N 2

OK, here's the deal,
I need to come up with a GCSE level chemistry question to stump my teacher, and frankly I have no idea what to put.
help required!

2007-05-14 06:14:32 · 4 answers · asked by Anonymous

Does anyone know how to write the chemical equation illustrating the combustion in the air of each of the following toxic gases:
A. Carbon Monoxide
B. Hydrogen Sulfide
C. Hydrogen cyanide

2007-05-14 05:40:43 · 2 answers · asked by Anonymous

What is the oral lethal dose in grams of the pesticide, Aldicarb, for a person weighing 175 lbs? (The LD50 of Aldicarb is 1.0 mg/kg)

2007-05-14 05:38:09 · 1 answers · asked by Anonymous

Chemistry AS ocr practical exam 15 th may tomorrow?

whats it on?
is it titration?

will there be any small tests?

2007-05-14 05:34:54 · 3 answers · asked by jinder 1

how angular momentum (p)becomes zero

2007-05-14 05:27:27 · 1 answers · asked by j.c 1

1-butene's boiling point is -6.5
trans-2-butene 's b.p is 1
2-methylpropene's b.p. is -7.
I need to know why? Please give me an explanation!

2007-05-14 05:26:59 · 6 answers · asked by Jewl 2

2007-05-14 05:25:04 · 5 answers · asked by Skepticat 6

a)which anions form only soluble salts with this group?
b)which anions form only insoluble salts with this group?
c)which anions form both soluble and insoluble salts with this group?

2007-05-14 05:21:26 · 2 answers · asked by M-28 1

2007-05-14 05:14:58 · 2 answers · asked by britt77016 1

itself?

2007-05-14 05:13:39 · 1 answers · asked by Anonymous

which has been mixed together, without any modifications?For example, when sugar and salt are mixed, how can we separate these two?

2007-05-14 05:06:51 · 4 answers · asked by mosthated101 1

2007-05-14 04:50:43 · 7 answers · asked by Franny 1

BF3, BCl3, AlCl3, CCl4, SiF4, SiCl4

2007-05-14 04:31:26 · 2 answers · asked by Anonymous

Use 2 paaragraphs

2007-05-14 04:26:56 · 2 answers · asked by Mad Mike 1

2007-05-14 04:04:44 · 6 answers · asked by Anonymous