2H2 + O2 → 2H2O + 130KJ 4.83 x 103 kJ 15. How many grams of H2 would be needed to produce 260. KJ of energy? 2H2 + O2 → 2H2O + 130KJ 8.08 g 16. 20. mol H2 reacts with 8.0 mol O2 to produce H2O.
After waiting for 30 minutes sharp, we measured the bags again and saw significant increases in mass for five out of the six dialysis bags. The orange solution did increase, but it was only a mere 1.47 percent change in mass. From this collected data, we were able to hypothesize which colored solution was which concentration. The order of the colors of solutions from least concentrated to most concentrated was: orange, green, yellow, blue, pink, and purple. How we were able to figure this out was because we knew that because of the solutions’ (except water) hypertonic nature, more water would rush in through the dialysis bags as the concentration increased.
Gold has a density of 0.01932 kg/cm3. What volume (in cm3) would be occupied by a 33.3 g sample of gold? A) 1.72 B) 5.80 x 10-4 C) 5.80 D) 0.581 E) 0.663 9. The number with the most significant zeros is __________. A) 2.5100000 B) 0.00002510 C) 2.501 × 10-7 D) 250000001 E) 0.02500001 10.
3. 4. Increasing the concentration of a solution will __________ the boiling point of the solution Increasing the concentration of a solution will __________ the freezing point of the solution Procedure: (BE SURE TO RECORD ANY OBSERVATIONS!) 1. Measure 1/2 cup (c) milk and 1/2 c whipping cream; put into a small Zip-lock baggie.
94820.2kg 8. What value did gold have? What is the resulting per gram value? 2.8236 billion. $0.034 per gram value 9.
When it is taken in and out of our arms, it affects the heat, not allowing the product to get consistent heat temperature. Another possible error was clothing, it could affect the temperature of the agents. Not all of us were wearing the same clothing, some had thicker t-shirts and some had a light sweater on. This changes the temperature because some agents may be warmer or some may be colder depending on the thickness of the clothing article. The cheese lab can be applied for research because scientists will know which cheese has the fastest rate of curdling and which will create the most.
a. )1 ml of water contains 7.14g of zinc b. )7.14 mL of water will hold 7.14g of zinc c.)One mL of water is equal in weight to 7.14g of zinc d.)7.14g of zinc occupies 1 mL in volume e.) there is a 1mL rise in water for every 7.14g of zinc added f.) 1 mL of zinc weighs
How many kilograms of pure HCl would be used to make this hydrochloric acid? (Assume that 30% has two significant figures. There are 2000 lb/ton.) (Obj 15) 30 ton HCl 2000 lb 1 kg ? kg HCl = 6.0 × 105 ton HCl soln 100 ton HCl soln 1 ton 2.205 lb 30 ton HCl 2000 lb 453.6 g 1 kg ?
The experimenter used 3 identical plastic cups and filled one with room temperature tap water, one with warm tap water and one with boiling tap water. Each cup was placed into the freezer and was checked every 15 minutes for signs of freezing. The experimenter found that the room temperature water showed the first signs of freezing and in the final outcome froze solid before the water in the other cups. His findings showed that water containing impurities, such as tap water, will freeze faster based on a lower starting temperature. The second case study was covered in an article by Science News.
0.10 M NaCN can only combine with 1/2 as many Ag+'s when it makes (Ag(CN)2-) so, yoiur answer is really 0.05 molar solubility of Agl in 0.10 M NaCN ======================================… 3) Predict whether solubility of BaF2 will increase, decrease, or remain the same with the addition of: a) HCl adds H+ , which removes F- ion, by converting it into HF the equilib: BaF2 <=> Ba+2 & 2F- will shift to the right to replace lost F- so,solubility of BaF2 will increase b) KF adds F-, which increases the F- ion, the equilib: BaF2 <=> Ba+2 & 2F- will shift to the left to reduce the added F- so,solubility of BaF2 will decrease c) NaNO3 solubility of BaF2 will remain the same, Na+ions & NO3-1 ions are not in the equilibrium ... and they do not combine with, to remove either Ba+2 ions or F- ions d) Ba(NO3)2 adds Ba+2, which increases the Ba+2 ion concentration, the equilib: BaF2 <=> Ba+2 & 2F- will shift to the left to reduce the added