Chemistry

Why does Copper have a higher density than Zinc

Zinc had a higher atomic mass than copper, but coppers density is greater. Can someone explain this to me?-Density is mass/volume.As mass increases, density increases.But since copper is more dense th

Calculate the heat released when 25.0g of water at

0 degrees celsius crystallizes to ice at the same temperature, the heat of fusion is of water is 80.0cal/g-dont you just multiply grams and heat of fusion? q = 25 x 80 q = 2000 cal

Help me please. Chemistry.

A student prepared a solution of sodium carbonate by adding 2.285g of the solid to a 250mL volumetric flask and adding water to the mark. Some of this solution was transfered to a buret. What volume o

What is the standard entropy change for the formation of butyric acid at 25 degrees C

I need help solving this little thermodynamics issue. Standard Heat ofAbsoluteFormation, DHf°,Entropy, S°, Substancein kJ mol-1in J mol-1 K-1 ----------------------------------------------------------

Chemistry problems...HELP!!!

NaCl (aq) + HCl (aq) --> NaCl (s) + HCl (aq) How does this reaction happen? Are there other acids that can perform a similar reaction? 2Na (s) + 2H2O(l) --> H2 (g) + 2NaOH (aq) Is sodium metal a base

A sample of rose gold weighs 12.0g.

5.0g of it is silver and 7.0 grams is cooper. what percent of this sample is copper?-7/12 = 0.58333 So 58.33% is copper.-Yo momma weighs 120kg! DANG!! OOOOOO!!! DAYM!

Does oxygen increase the rate of decomposition for food

If I left food out in the open air would the rate of decomposition be increased vs. if I left the food in a controlled environment with no air??-yes, it does, hope this helps!!!!!-Yes, oxidation is o

What is the molarity of 0.96g MgCl2 in 500mL of solution

molarity= no. of moles/Liter determine moles of MgCl2: 0.96g MgCl2/molec. wt MgCl2= ? moles MgCl2 ? moles MgCl2 x 1000 ml/500ml= molarity-Molarity is mass divided by volume.Hopefully you know which is

Classify the molecule SiBr4

1. polar molecule with nonpolar bonds 2. nonpolar molecule with nonpolar bonds 3. nonpolar molecule with polar bonds 4. polar molecule with polar bonds-The answer is (3), since the Si forms a tetrahed

Chemistry Lab help needed with "unknown" compound!,

What is procedure(lab test) i could do to prove i have a calcium cation?? I did a test to prove my anion(i think we have calcium chloride). I have already did a flame test(orange-red flame) but ther

2.38g of uranium was heated in air.The resulting oxide weighed 2.806g.determine the empirical formula of oxide

U=238; O=16-To solve this problem, we need to assume that every uranium atom is oxidized, and that all the oxide molecules have the same formula.Well also ignore any experimental uncertainty in the me

Chemistry help? (solution concentrations)

yikes. im lost. answer any or all if you can. thank you!! 1) a mixture contains 76.5% sodium chloride, 6.5% magnesium chloride, and 17% sodium sulfate by mass. what is the molarity of cl ions in solu

Chemistry question 10 points

citric acid is triprotic carboxylic acid i need the chemical formula and other thing is i have another formula for citric acid which says here citric acid is a carboxylic acid and formula is C6H8O7 i

Equilibrium help needed

What is the srongest base present In the equilibrium shown below? H2CO3 + H2OHCO3-+H3O+ A. H2O B. H2CO3 C. HCO3 - D. H3O+ I do not earn any points for this question, but I do need to understand how

What should i review for chemistry cst

like a list of things i should know/review to get a proficient+-You should know the periodic table to a degree - groups, periods, etc. Reactivity of alkali metals, noble gases etc. You need to know t