Can someone help me with a few chemistry questions?
All of the following are properties of sodium. Which one is a physical property of sodium? (2 points) a. It is surface turns black when first exposed to air. b. It is a solid at 25°C and changes to a liquid when heated to 98°C. c. When placed in water it sizzles and a gas is formed. d. When placed in contact with chlorine it forms a compound that melts at 801°C. # Which of the following is an example of a physical property? (2 points) a. corrosiveness of sulfuric acid b. lead becomes a liquid when heated to 601°C c. flammability of gasoline d. neutralization of stomach acid with an antacid e. toxicity of cyanide # Which one of the following represents a chemical change? (2 points) a. heating water to form steam b. sliced apples, in contact with air, turning brown c. sugar dissolving in hot coffee d. mixing sugar and cinnamon e. cutting a bar of sodium metal into pieces with a knife # Which one of the following represents a physical change? (2 points) a. water, when heated, forms steam b. bleach turns hair yellow c. sugar, when heated, becomes brown d. milk turns sour e. apples, when exposed to air, turn brown # Which one of the following represents a chemical change? (2 points) a. boiling water to form steam b. bleach turns hair yellow c. melting butter d. mixing powdered zinc and sulfur at room temperature e. cutting a bar of sodium metal into pieces with a knife
Can someone help me out with this chemistry question?
Given the following data for graphite and diamond at 298K. S°(diamond) = 0.58 cal/mole deg S° (graphite) = 1.37 cal/mole deg ΔH°f (from graphite) = -94.48 kilocalories/mole ΔH°f (from diamond) = -94.03 kilocalories/mole Consider the change: C(graphite) = C(diamond) at 298K and 1 atmosphere a) What are the values of ΔS° and ΔH° for the conversion of graphite to diamond? b) Perform a calculation to show whether it is thermodynamically feasible to produce diamond from graphite at 298K and 1 atmosphere. c) For the reaction, calculate the equilibrium constant, Keq, at 298K. Thank you so much for any help.
Can someone help me with my Chemistry questions?
I need to label the solutions below as hypotonic, hypertonic, or isotonic in comparison to 0.10M NaCl. 1. 0.05 M Ca3(PO4)2 2. 0.20 M C6H12O6 3. 0.05 M BaCl2 4. 0.05 M K3PO4 I believe it goes..... 1. Hypertonic 2. Isotonic 3. Hypotonic 4. Isotonic Any help would be great!
Could you help me with this chemistry question?
Either method II or method III would work in theory. However, an electronic balance is not usually designed for weighing things the size of rocks. So the correct answer is II.
Can someone help me with this chemistry question about nitric acid?
Hi :)...how do i do this question: A 25.00-mL aliquot of a nitric acid solution requires reaction with 23.62 mL of 0.114 mol L1 potassium hydroxide solution for complete neutralisation. a)write the balanced molecular equation for this reaction b)What is the concentration of the original nitric acid solution? all answers are appreciated...i will give 10 points to best answer thanks :)
Can someone help me with Chemistry?
The answer key says that the answer to the question is 2.6 Å - 6.8 Å. A 2.6 Å diameter assumes an arrangement with maximum empty space. The larger radius, 6.8 Å assumes an arrangement with NO empty space. I don't know how to get the larger radius. Sorry for the late update, but can someone please help with this? (btw thank you to the people who helped on finding the smaller diameter).
Can someone help me with chemistry extra credit questions?
What is the normality of the solution if we dissolve 4.5 g of Mg(OH)2 in 250.0 mL of water? The Ka of formic acid is 1.8x10-4. What is the pH of a buffer system that contains 0.75M formic acid (HCOOH) and 0.60 M sodium formate (NaCOOH)? What would be the new pH of 1.0-L of the buffer described above after the addition of 0.20 mol of HNO3?
Can someone help me solve 3 molarity (chemistry) questions?
I have 3 questions, 2 of which I think I know, and 1 that I do not. Please help me do the 1 and check my other 2 to see if they are correct. Fastest and clearest answer = automatic best! 1. You dissolve 12.47g of MgCl2 in wate to make 150 mL of solution. What is the molarity of chloride ion? 2. 25 mL of 0.500M NaCl is mixed with 35 mL of 0.350M CaCl2. What is the molarity of the chloride ion in the solution? My answer: 0.4125M 3. Density of copper sulfate solution CuSO4 is 1.184g/mL. What is the molarity of this solution that contains 35g CuSO4 / 100g of solution? My answer: 7.4M
Can someone help me understand this question in chemical equilibrium?
Initial SO3 = 1 mol/L Initial SO2 = 0 mol/L Inition O2 = 0 mol/L At equilibrium 0.6 mol/L of SO2 was formed 2SO3 <---> 2SO2 + O2 Since you end up with 0.6 mol SO2 you must also end up with 0.3 mol O2 (from the ratio of the coefficients of SO2 and O2). 0.6 mol /L of SO3 must decopose to yield 0.6 mol/L of SO2; therefore- The equilibrium concentration of SO3 = 1.0 - 0.6 = 0.4 mol/L Keq = [SO2]^2[O2] / [SO3]^2 Keq = 0.6^2 x 0.3 / 0.4^2 Keq = 0.36 x 0.3 / 0.16 Keq = 0.675