Chemistry

I need help answer with right answer
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How many Joules are required to heat 40g of water from 13C to 40C?J
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In the balanced equation-aPb(NO3)2(s)heatb PbO(s)+ c NO2(g)+ dO2(g); the values of a,b,c, d are respectively
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Tam a highly reactive alkali metal in period 3 with only one valence electronO Sodium (Na)Beryllium (Be)Magnesium (Mg)
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How much energy is required to vaporize 1.5 kg of aluminum? (Refer to tableof latent heat values.)A. 733 kJB. 1650 kJC. 7095 kJD. 600 kJ
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A projectile is projected with an initial velocity of 40 m/s at a 45o angle to the horizontal. , calculate the total time travelled.
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Approximately 1 mL of two clear, colorless solutions, 0.1 M Ba(NO3)2 and 0.1 M Na2SO4, were combined. Upon mixing, a thick milky white precipitate formed. After centrifugation, the solution above the precipitate was found to be clear and colorless. Based on the these observations, determine if a reaction occurred. If so, what is the net ionic equation for the reaction.
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Question :What's oxidation?
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What is the coefficient for hydrogen in the balanced equation for the reaction of solid tungsten(VI) oxide with gaseous hydrogen to form solid tungsten and liquid water?
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I NEED HELP ASAP!! What is the difference between the experimental group and a control group?
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What is the pH of a 4.7 x 10-9 M HCl solution? * 4.67 8.33 11.21 2.93
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Of the following waves, which kind of wave does NOT require a medium?a. lightb. water. ultrasoundd. sound
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What type of energy is being represented in the image
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What volume of DI water, in mL, must you use to dissolve 30.0 g of NaOH in order to make a 1.25 M solution? mL (round to whole number)
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When mechanical energy is transformed, A. potential energy remains unchanged. B. heat is given off. C. kinetic energy remains unchanged. D. friction is encountered.
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If the colour of a solution turns pink on adding few drops of phenolphthalein indicator, it means solution is acidic. Select one : TrueFalse
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HELPPPPP MEEEEE ASAPPPAccording to the diagram above, when the north end of the Earths axis is tilted toward the sun, explain the suns effect on the North America. A. North America will experience more indirect rays and shorter days B. North America will experience more indirect rays and longer days. C. North America will experience more direct rays and shorter days D. North America will experience more direct rays and longer days.
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Please help me l dont understand please !!!!!!
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A flask contains 1.45 moles of N2, 0.659 moles of He. If the total pressure is 775 torr, what is the partial pressure of O2 ?
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At what temperature would the volume of a gas be 0.550 L if it had a volume of 0.432 L at 20.0C? Be careful! This is not in the correct units for temperature.
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a 1.4g sample of pure gas occupies a volume of 981 mL at 42C and 117 kPa. Determine the molar mass of the compound.
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Albino trees exist in nature, but theyre rare. These trees contain a gene mutation that causes them to lack chlorophyll, so their leaves are white. In California, albino redwood trees are parasites. They survive off the energy from nearby redwood trees. Why do you think they need to use energy from other trees to survive?
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All of the facts about our star the Sun listed below are true EXCEPT which option?A. the sun is the smallest object in our Solar System.B. the sun is an average-sized yellow star. C. the sun is located in an arm of the spiral shaped Milky Way galaxy.D. the sun appears brighter because it is much closer to Earth than other stars
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Scientists have developed a new way to extract natural gas, called hydraulic fracturing, or fracking. Which of these is a positive impact of this method? A. Decreased habitat B. Decreased earthquakes C. Increased supplyD. Increased demand
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