Chemistry help :( please someone help?
At higher altitudes, there is less atmosphere above you. The atmosphere protects us from radiation from the sun. Less atmosphere means less protection means more exposure to cosmic radiation. Interestingly, submariners working on nuclear submarines get less radiation exposure than the average person because the exposure is carefully controlled and monitored, and they don't see the sunlight for months at a time.
Chemistry help someone plz..?
Love U, Remember these two facts before beginning: the moles of acid must equal the moles of base: Moles acid = moles base Moles of acid = molarity base * volume base = 0.102 moles/L * 0.0288 L = 0.00294 moles Since you know the molar mass to be 60.05 g/mole, the grams of actual acetic acid in the vinegar is: Mass of acetic acid = 0.00294 moles*(60.05 g/mole) = 0.176 grams As you see, the mass of the original vinegar sample is not relevant in this problem! Hope that helped!
Could someone into chemistry/physics help?
First of all, we need to know what causes steam visible?The layer of air right above the hot liquid (making steam) may be as much as 20% water! But this layer is lifted by natural convection into the cooler air above it. Now the air cannot hold as much water, and so some returns to the liquid form. Tiny drops condense out, making the visible steam.The plume of steam above the hot liquid is actually a cloud of tiny drops of water. The evaporation of water is an important mechanism for cooling the liquid; the re-condensation of the water delivers the energy to the surrounding air.Apparently the air in the room is not as humid as it could be, and so as the steam cloud mixes into the air, the little drops evaporate again. The steam disappears.Reference - Physics Tutor / Chemistry Tutor
Can someone help with chemistry homework?
Okay, you use the fact that STP one mole of any gas occupies the same volume, the molar volume constant is 24dm3/mol. Mr(c2h2)=2*12+2=26 g/mol so 9.45g is 9.45 /26 mol or 0.363 mol ( 3sf) and so 24 * 0.363 dm3 or 8.71dm3. So 8.71 dm3.
I need some with this chemistry problem can someone help me. SHow details on how you got your answer please?
Eq. S8+o2=so2 Balanced eq. s8 + 8o2 = 8 so2 G=given UK=unknown (g)= grams (mols)= moles G(g) X 1 mol X UK(mol) X UK(g)= UK(g) ...........Over.....Over.........over ...........G(g)......G(mol).......1 mol from: (periodic table) (equation) (periodic table) 31.5g S8 X (1mol)/(32.06X8)= 31.5g s8 x 256.48= 8079.12 mol S8 8079.12 mol S8 X 8 mol so2(Bal. Eq) over 1 mol s8 (Bal eq) 8079.12x8= 64632.96 mol s8 64632.96mol so2x.... 63.86g so2 over 1 mol s= 1 x 32.06 o= 2 x 15.99 ==63.86 Answer:64632.96 X 63.86 = 4127460.826 g so2 GOOD LUCK! Its a lot harder to type then I thought!
Where can I find someone to help me with the topics for a chemistry project for the Class 12 CBSE?
You can choose alloys as it is one of the easiest topics. I chose this topic and trust me there's nothing much to sk from this topic.
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
Would someone help me with my chemistry homework on chemical changes?
First you must define your problem! a wick in a candle is usually a cotton or other burnable string general formula C6H10O5. It is an organic compound burning it forms CO2 and H2O thru a series of steps. Such a wick in a candle when ignited burns, melts the wax, and wicks the melted wax to the burning flame where the wax is vaporized and burned, again to CO2 and H2O. Since the burning is at a relatively low temperature it is incomplete and many intermediate compounds [soot, CO] are formed.The wick in a kerosene lantern such as a Colman lantern is made of a ceramic fiber; it does not burn but serves to bring the liquid fuel to the burning flame that must be ignited by a match or other external flame