Homework Help

A mixture of lithium and sodium hydrides reacted with 193 cm3 of water. The weight of the solution obtained by 1 gram is less than the sum of the masses of all starting compounds. Mass fraction in the percentage of alkalis in the solution amounted to 8%. Calculate the mass of the hydrides. I do not need a ready-made solution task. Tell me the way solution task. Where to start solving the task?

The de Broglie equation relates to the wave property of matter. λ = h/mv, where λ is wavelength, h is Planck's constant, m is the mass of a particle, moving at a velocity v. h = 6.626 x 10^-34 J•s. m = 96.0 mg v = 30.0 m/s Convert milligrams to kilograms m = 96.0 mg x 1g/1000 mg x 1kg/1000g = 9.60 x 10^-5 kg Calculate the wavelength λ = 6.626 x 10^-34/96.0 x 10^-5 x 30.0 = 2.30 x 10^-31 m Is this right?

I’m trying to answer this question using the example in my book but I don’t understand how to go about it.

I’m not sure if this is the correct method. a. With the help of the distillation method you can separate and identify the components of the menthol water solution. b. Distillation process is used to separate mixtures from a liquid by exploiting differences in boiling points. The substance with the lowest boiling point will boil first and the fumes will be collected by condensation. c. The advantage of the distillation method is that the heating temperature will decrease at lower pressures and reduce heat energy.

I need help finishing this problem. I’m not sure if the steps are correct of what I have done so far. Percent by mass C = 40.60% Percent by mass H = 5.18% Percent by mass O = 54.22% Empirical formula = ? (unknown) Inverse molar mass C = 1 mol/12.01 g Inverse molar mass H = 1 mol/1.008 g Inverse molar mass O = 1 mol/16.00 g Convert the masses to moles. C = 40.60 g/12.01 g/mol = 3.380 mol H = 5.18 g/1.008 g/mol = 5.138 mol O = 54.22 g/16.00 g/mol = 3.388 mol Divide by the lowest, seeking the smallest whole-number ratio

I need help with this question. This is what I have so far mass = 37.2 g AICI3 (given) number of ions = ? AI3+ Ions (unknown) number of ions = ? CI- Ions (unknown) mass = ? g/formula unit AICI3 (unknown) a.

Is this the correct equation for alpha decay? 243/93 Am —> 239/93Np + 4/2He

I am going through this section of Einstein's Popular Exposition of Special Relativity https://www.bartleby.com/173/10.html#txt1 "In the first place we require to determine the points Aand B of the embankment which are just being passed by the two points A'and B' at a particular time t—judged from the embankment. These points A and B of the embankment can be determined by applying the definition of time given in Section VIII. The distance between these points A and B is then measured by repeated application of the measuring-rod along the embankment" and have two questions I seem to need help with 1) What might be a rigorous set up of a…

I am doing a project in science, and I need a device that is able to kill a static charge. I used to have it so the charge would run outside and run into the ground through a copper rod, but my science teacher said that I need to find a way so that I don't need to run it outside. The reason I can't find it myself is that whenever I search up "Device that kills static charges" on bing or google, all I get is websites saying if you can get killed by static discharge or not. Thanks!

I don’t understand this question

#8 The density of the copper sample is unknown. The known values include the initial and final volumes and the density of a vessel. density = 30 mL initial volume = 5.0 g final volume = 40 mL Volume of sample = final volume - initial volume Is this correct what I have so far??

SiO2 + (4)HF —> SiF4 + (2)H2O Is this correct?

I need help arranging the elements.

I don’t understand how to convert using dimensional analysis. I have to follow the exact example.

For #14, is this 60 27Co?

How to find an equation of a line can anyone explain please?

I know that this is SSS(side side side) but I need help with the congruency statements.

specifically, wow do marine and freshwater biologists use pH reading in interpreting their results?

What is the formula for finding the roots of a cubic equation?

How do I find the corresponding parts?

Hi, my professor just uploaded the correct answers to our exam, and he is known to make a lot of mistakes in exam sets. We've been given the past four exam sets, and I have been able to find several mistakes, all of which he recognized when I contacted him - and I am no great mastermind of biology, so that says something about the amount of mistakes. Based on that, I suspect there might be mistakes in the exam set from last week. I am quite biased myself, so I would like someone (who also knows a lot more about biology and biochemistry than me) to look through the answers, and tell me if they are indeed all correct, or if some of them are ambiguous. There are 52 ques…

Hey! I need help with one reaction, I need to write this KCl+LiNO3=KNO3+LiCl shorter reaction, but I dont know how. Pleeeasee I need help now.

I have a question. I am doing a science project on insulative cups I would like to know what is the better insulator plastic or metal?

I have an assignment to do a phylogenetic analysis on a gene that is interesting and holds relevance. I am really struggling to come up with a good interesting and relevant question which could be answered with phylogenetic tree and analysis. I originally wanted to do it cospeciation of malaria however it seems this is too complex for the time frame I have got. Would anybody help me with ideas/topics? Thanks

How do marine and freshwater biologists use pH reading in interpreting their results?