Chemistry - October 2007

Does this apply to all liquids like water or blood for instance????

2007-10-29 21:33:56 · 8 answers · asked by Anonymous

How many milliliters of 0.210M HCl are needed to neutralize completely 35.0ml of 0.101M Ba(OH)2 solution?

2007-10-29 19:33:24 · 2 answers · asked by Anonymous

2007-10-29 18:18:04 · 3 answers · asked by mceb 1

Find the density and first ionization energy for sodium, potassium, magnesium, and calcium. What do these values predict will happen physically (not chemically) when each is added to water?
Which will be easiest to oxidize?
Which will be the hardest to oxidize?

Na- Density: .968g/mL; IE: 496kJ/mol
K - Density: .856g/mL; IE: 419kJ/mol
Mg - Density 1.738g/mL; IE: 738kJ/mol
Ca - Density 1.55g/mL; IE: 590kJ/mol

Thank you for any help!

2007-10-29 17:33:17 · 2 answers · asked by Anonymous

a) 1.00 molar mass Ca
b) 1.00 molar mass Fe

*can someone tell me how to get the answer?

2007-10-29 16:03:22 · 4 answers · asked by Anonymous

Just want to know. please help

2007-10-29 15:55:05 · 10 answers · asked by Anonymous

For the reaction 2Al + 6HCI3 -> 2AlCI3 + 3H2 how many moles of H2 are produced by the complete reaction of 4.90 moles of Al?

2007-10-29 15:30:46 · 2 answers · asked by Lost 1

I need to name these compounds:

1. Pb(H2P)2

2. H3P

Other than those two problems, I could solve the rest...

2007-10-29 15:26:46 · 1 answers · asked by dancelikewhaaaat 1

how does it work?
do you take the state of the higher element or the lower?

2007-10-29 14:55:39 · 1 answers · asked by sweetheart 2

what information can you get from a chemical equation??

simple answer please!!

2007-10-29 14:55:31 · 2 answers · asked by THAT is the question 2

2007-10-29 14:43:58 · 2 answers · asked by hemi_jack 1

i need to calculate the mass of potassium hydrogen phthalate which must be dissolved in water to make 500ml of 0.2000M solution. plz help

2007-10-29 14:33:30 · 2 answers · asked by Anonymous

2007-10-29 14:25:58 · 2 answers · asked by jose c 1

2007-10-29 14:21:14 · 3 answers · asked by jose c 1

plz hlp u guys r my only hope. I have a test on this stuff tommorrow. Plz hlp me out man. I don't care who u r. i need someone with a kind heart to h;p me. U'll get karma points.

2007-10-29 14:17:56 · 3 answers · asked by Anonymous

How fast must a 146 g baseball travel in order to have a de Broglie wavelength that is equal to that of an x-ray photon with wve length = 100. pm?

2007-10-29 14:17:09 · 1 answers · asked by Anonymous

What would be the bond angle for oxygen or O2. How do you get its shape? Also, how do you distinguish between trigonal planars and trigonal pyramidal shapes? I'm bad at this, and don't know how to do all of this?

For example, how do you know what shape Hydrogen Sulfide is, and what its angle will be?

2007-10-29 14:12:45 · 2 answers · asked by Anonymous

By what factor will the kinetic energy change if the speed of the motorcycle is increased to 108 mph?
KEnew=____KEold

2007-10-29 14:12:13 · 1 answers · asked by Anonymous

These are some pratice problems out of my book that are similiar to my homework problems online but they dont show work since they are even. Someone mind showing a example, really apperciate it.

How many grams of methane [CH4(g)] must be combusted to heat 1.20 kg of water from 23.0°C to 85.0°C, assuming 1.00E2% efficiency in heat transfer?

And

At one time, a common means of forming small quantities of oxygen gas in the laboratory was to heat KClO3:
2KClO3(s)--->2KCl(s)+3O2(g) H=-89.4kJ

For this reaction, calculate for the formation of the following:

a) 0.805 mol of O2
b)10.85g KCl

And


How many grams of methane [CH4(g)] must be combusted to heat 1.20 kg of water from 23.0°C to 85.0°C, assuming 1.00E2% efficiency in heat transfer?

2007-10-29 14:02:01 · 1 answers · asked by Reviction 1

A 2.200 g sample of quinone, C6H4O2, is burned in a bomb calorimeter whose total heat capacity is 7.854 kJ/°C. The temperature of the calorimeter increased from 22.54°C to 29.67°C. What is the heat of combustion per gram of quinone?
ANS:____kJ/g

What is the heat of combustion per mole of quinone?
ANS:____kJ/mol

2007-10-29 13:59:44 · 2 answers · asked by Anonymous

Does anything happen if Vinegar touches water or ice?

2007-10-29 13:59:42 · 1 answers · asked by eugene0426 1

The nonmetal oxide, CO2, reacts with the metal oxide, CaO, to give CaCO3. would you expect boric oxide to react similarly with CO2?

I wouldnt think so because boron isnt even a metal so it wouldnt be considered a metal oxide....but im hoping theres a better explanation

2007-10-29 13:48:52 · 1 answers · asked by Anonymous

i don't get how to find the molecular formula and the empirical formula? what do you need to find these two?

2007-10-29 12:55:06 · 3 answers · asked by Anonymous

what is this stuff aggg

2007-10-29 12:52:53 · 2 answers · asked by azncatgirl 2

A student determined the heat of neutralization of perchloric acid mixed with sodium hydroxide solution. 40 milliliters of 1.00 M HClO_4 were added to 40.5 mL of 1.00 M NaOH solution

2007-10-29 12:45:57 · 1 answers · asked by Anonymous

We did a flame test on ions to determine the identity and i have no idea what this means.

2007-10-29 12:32:29 · 1 answers · asked by azncatgirl 2

I'm doing an assignment on radio activity so i need to know 3 benefits can you help me with it?

2007-10-29 12:22:49 · 4 answers · asked by highToke 1

At equilibrium, the value of the reaction quotient, Qp, is 0.636. What will be the value of Qp if the total pressure of the reaction shown below is doubled?

A (g) ↔ 4 B (g)

the answer is 5.09 but why?

2007-10-29 10:38:57 · 1 answers · asked by Anonymous

i want the formula in case of solution containing a solute and a solvent???

2007-10-29 10:30:50 · 2 answers · asked by Anonymous

Hello, I need help to do this question.

1. One of the akali metals reacts with oxygen to form a solid white substance. When this substance is dissolved in water, the solution gives a positive test for hydrogen peroxide, H2O2. When the solution is tested in a burner flame, a lilac-purple flame is produced.

a) What is the likely identity of the metal? (i believe it is potassium)

b) Write a balanced chemical equation for the reaction of the white substance with water

Thanks

2007-10-29 10:27:53 · 1 answers · asked by gabucha 1