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if 143 grams of water having an initial tempurature of 257 c are cooled by removing 427 kj of heat from it what is the
a balloon is filled with gas to 165 ml at 20c the balloon then expands to 345 ml by changing the temperature what
experiment steps1 boil 200ml water in a 400ml beaker2 add 50 ml 030m pbno32nbspto a regular test tube3 add 030 m hcl in
a molecule with a central atom and two bonded atoms is bent with a bond angle of 105 degrees assuming the central atom
describe thenbsp4 levels of protein structurenbspwhy is shape so
a solution of ammonia and water contains 150times1025nbspwater molecules and 550times1024nbspammonia molecules how many
give the percent yield when 2816 g of co2 are formed from the reaction of 5000 moles of c8h18 with 4000 moles of o2
what effect has a directional bond on the weight to volume ratio of in an atomic
the fundamental frequency is 2230 cm-1 for 1h 127i if the h atom is replaced with d isotope of h atom calculate the
a compound of carbon hydrogen and nitrogen was analyzed and found to contain 4662 c 1220 h 4118 n by mass what is
a hydrocarbon contains only c and h is burnt in air to produce co2 and h2o the number of moles of co2 produced is 15
pigments are responsible for many of the beautiful colors that we see in the plant world for instance lycopene is the
briefly define ionic and metallic bonding and explain the differences between the
explain stoichiometry in simple terms definition im given numerical relationships between chemical amounts in a
bleach contains the active ingredient naclo analysis of bleach involves two sequential redox reactions first bleach is
what is the sds for regular bleach physical state route of exposure and symptoms required protective equipment first
when would you use a volumetric flask to make solutions instead of a graduated cylinder when would you use a graduated
re le chateliers principle lab1 describe the effect on the solubility of znoh2nbspwhen solution of hcl naoh and
the half life for radioactive decay a first-order process of plutonium-239 is 24000 years how many years would it take
a particular brand of beef jerky contains 00552 sodium nitrite by mass and is sold in an 450nbspoz bagnbspwhat mass of
a 252nbspgnbspsample of a compound containing only carbon hydrogen nitrogen oxygen and sulfur was burned in
le chateliers principle labdescribe the effect on the solubility of mgoh2nbspwhen solutio of hcl naoh and nh3nbspare
a reaction has a rate constant of 113times10-2 s at 400 k and 0686 s at 450 k determine the activation barrier for this
2mno4-nbspnbspcl2 4h ------gtnbsp2clo3-nbspnbsp2mn2 2h2oin the above redox reaction use oxidation numbers to identify
nonbspnbsp3cu2 2h2o -----gt 3cunbspnbspno3- 4hin the above redox reaction use oxidation numbers to identify the element