Chemistry Homework Help

Explain the definition of a compound.The definition of a compound says "Two or more substances combined in a fixed ratio". What does this...

Posted by tamanimat January 31, 2013 at 8:35 AM via web. 1 educator answer. »

at rest, your brain gets about 15% by volume of your blood. If your body contains 5.2 L of blood, how many liters of blood are in your brain...

Posted by user1976113 January 30, 2013 at 9:26 PM via web. 1 educator answer. »

Calculate the work w when 1 litre of an ideal gas at an initial pressure of 31 atm is expanded isothermally to a final volume of 31 litres...

Posted by chenry1993 January 25, 2013 at 7:12 AM via web. 1 educator answer. »

What is the difference between an atom and a molecule?No

Posted by bgoin1130 January 25, 2013 at 1:43 AM via web. 1 educator answer. »

Joyce combines 9 atoms of hydrogen and 3 atoms of nitrogen to make 3 molecules of ammonia.Graph this direct variation with nitrogen along the...

Posted by user4046196 January 24, 2013 at 6:28 PM via web. 1 educator answer. »

A glass of water contains 0.45mM O2. How many millilitres of oxygen gas at STP are dissolved in 300.0 mL of this water ? 

Posted by catuebaby123 January 22, 2013 at 7:35 AM via web. 1 educator answer. »

A compound contains 20.1% hydrogen and 79.9% carbon by mass. Calculate the empirical formula for this compound.

Posted by r4rob92 January 16, 2013 at 2:42 PM via web. 1 educator answer. »

There is 20.30 g sample of a compound containing phosphorus and oxygen and 8.87 g of it is phosphorus. What is the empirical formula of compound

Posted by r4rob92 January 16, 2013 at 2:39 PM via web. 1 educator answer. »

Convert the following word equation into a balanced symbol equation: Copper(2) carbonate + hydrochloric acid---> copper chloride + water +...

Posted by user3120320 January 12, 2013 at 8:57 PM via web. 1 educator answer. »

Please help write out and balance the following equation:  Calcium Hydroxide + carbon dioxide --> calcium carbonate + water

Posted by user3120320 January 12, 2013 at 8:50 PM via web. 1 educator answer. »

What is a test for water purity?Question from my Year 11 chemistry textbook: 8b) Describe a test to show that a sample of water is pure.

Posted by pokepal101 January 11, 2013 at 3:44 AM via web. 1 educator answer. »

In chemistry, what is nomenclature?

Posted by fstettner January 2, 2013 at 8:05 PM via web. 1 educator answer. »

What present-day practices resemble alchemy rather than chemistry? 

Posted by nimsajd December 24, 2012 at 5:06 AM via web. 1 educator answer. »

Which chemicals can produce a color change from clear to opaque and back again in water?I am a professional Magician designing a new stage...

Posted by user9569576 December 22, 2012 at 8:45 PM via web. 1 educator answer. »

Where does sea glass come from? (explain the chemistry)

Posted by rossyy December 7, 2012 at 4:13 AM via web. 1 educator answer. »

What is the mass/volume of a 3.00 M solution of NaCl?

Posted by shawnwifey16 December 1, 2012 at 4:43 AM via web. 2 educator answers. »

The rate constant of a rxn is 1.2×10^3 sec−1 @ 400 C and 2.5×10^5 s−1 @ 410 C.Calculate the energy of activation. Answer in units of...

Posted by stexaschic254 December 1, 2012 at 4:31 AM via web. 1 educator answer. »

What is the dielectric constant of water?

Posted by somakc November 30, 2012 at 2:53 PM via web. 1 educator answer. »

Explain the observations obtained from the following experiments. Write the balanced equations involved.(i) Anhydrous beryllium chloride is...

Posted by luckyb0y1314 November 27, 2012 at 7:26 AM via web. 1 educator answer. »

Vanadium (V) oxide is used as catalyst in the reaction below.2 SO2 (g) + O2 (g) --->  2 SO3 (g)Explain how Vanadium (V) oxide is able to...

Posted by luckyb0y1314 November 19, 2012 at 4:47 AM via web. 1 educator answer. »

BeCl2 is a linear molecule. Explain the hybridization of orbital in BeCl2.

Posted by stevesam93 November 19, 2012 at 4:40 AM via web. 1 educator answer. »

Why is nitrogen monoxide, NO, formed in a car engine? Explain briefly why the presence of nitrogen oxides in air is polluting?

Posted by stevesam93 November 18, 2012 at 12:25 AM via web. 1 educator answer. »

Methanamide, HCONH2, is a planar molecule. All the bond angles in the molecule are approximately 120 degree.The C-N bond length measured is...

Posted by luckyb0y1314 November 18, 2012 at 12:19 AM via web. 1 educator answer. »

When one mole of magnesium is burned, it forms magnesium oxide and releases 39.2 J of energy. Describe this chemical reaction in four...

Posted by rtarasco November 14, 2012 at 10:35 PM via web. 1 educator answer. »

Is there a simple way to remember the shapes of molecules & their bond angles?

Posted by nat-a-lie07 November 10, 2012 at 2:20 AM via web. 1 educator answer. »

I want to know in detail about the different types of systems in themodynamics with examples.    

Posted by tharagauthamm November 7, 2012 at 5:38 PM via web. 1 educator answer. »

Given either Silver Nitrate, Barium Nitrate or Magnesium Nitrate, find a way to determine what solution you have by forming...

Posted by button33 November 2, 2012 at 11:24 PM via web. 1 educator answer. »

What are valence electrons?

Posted by beautifulsunshine16 November 1, 2012 at 10:14 PM via web. 1 educator answer. »

 What family on the periodic table does fluorine belong to?

Posted by ljm3515 November 1, 2012 at 6:47 PM via web. 1 educator answer. »

Can anyone explain me polymerisation?

Posted by carbovader November 1, 2012 at 1:13 PM via web. 1 educator answer. »

Which of the following groups of polymers can be recycled? Explain your answer.A. Ziegler-Natta catalysed polymerB. Thermoplastic polymerC....

Posted by stevesam93 November 1, 2012 at 3:34 AM via web. 1 educator answer. »

What is the concentration of nitrogen atoms in this solution?A typical solid fertiliser for use with household plants and shrubs contains the...

Posted by luckyb0y1314 October 31, 2012 at 12:59 PM via web. 1 educator answer. »

102 ml Hydrogen, 52 ml OxygenHi ! What we will get if we mix 102ml H with 52ml O ?  I was reading "Gay Lussac’s Law of Gaseous Volumes",...

Posted by pokrate October 31, 2012 at 11:08 AM via web. 1 educator answer. »

chemical equation when copper2 sulfate add with ammonium hydroxide?  

Posted by atikaheiyka60 October 30, 2012 at 3:40 PM via web. 1 educator answer. »

What is effect on lunar and solar tides ,if diameter of earth were increased by 20%? Which is more effected?Actually strength of both tides...

Posted by parvesh October 30, 2012 at 2:35 PM via web. Be the first to answer. »

The following data were collected for the reaction M + N --> P +QThe following data were collected for the reaction M + N --> P + Q...

Posted by justincathcart1 October 29, 2012 at 1:03 AM via web. 1 educator answer. »

What is the formula name for Ca2+ and NH4+?

Posted by animalover4546 October 27, 2012 at 7:22 PM via web. 1 educator answer. »

Why does water not get burned?

Posted by astrosonuthird October 21, 2012 at 3:29 PM via web. 1 educator answer. »

How is fission different from alpha or beta decay?

Posted by fire-starter October 18, 2012 at 11:50 PM via web. 1 educator answer. »

How are lone pairs of valence electrons related to the shapes of species in which all pairs of valence electrons are involved in bond...

Posted by cassandralivingston October 17, 2012 at 10:31 PM via web. 1 educator answer. »

how would the symmetry and polarity of a molecule be affected in the case of non-identical attached atoms 

Posted by yahhhh October 17, 2012 at 2:21 AM via web. 1 educator answer. »

Calculate the density of the solid: Volume of water 48.4mL  Volume of water and solid 62.7  Mass of solid 123.4 g

Posted by hmh2442 October 16, 2012 at 7:18 PM via web. 1 educator answer. »

How does one determine whether double or triple bonds exist within a molecule?

Posted by yahhhh October 14, 2012 at 9:37 PM via web. 1 educator answer. »

If a sample of benzene (C6H6) is 91% pure and the combustion of benzene by the reaction has a 54% yield, how much water is produced from 0.49...

Posted by precious531 October 14, 2012 at 7:12 AM via web. 1 educator answer. »

List important characteristics of p-block elements.

Posted by flowerpowergirl October 14, 2012 at 3:42 AM via web. 1 educator answer. »

Calculate the number of sodium ions in 1.0dm3 of mineral water. (Avogardo constant= 6.02 X 10^23 mol^-1

Posted by jm244 October 12, 2012 at 7:42 AM via web. 1 educator answer. »

What happens to pressure as volume increases?

Posted by sarajackson63 October 11, 2012 at 12:57 AM via web. 1 educator answer. »

Is ethanol C^2H^6O (l) (alcohol) a salt, base, acid, or none of these?

Posted by klady12 October 10, 2012 at 4:02 PM via web. 1 educator answer. »

Is Sucrose C^12H^22O^11 (s) (table sugar) salt or base or acid or neither? which is it?

Posted by babygurl175 October 10, 2012 at 3:58 PM via web. 1 educator answer. »

Is Sodium bicarbonate NaHCO^3 (aq) ionic or molecular? which is it?

Posted by babygurl175 October 8, 2012 at 2:11 PM via web. 1 educator answer. »