Homework Help

Say you want to start a "National Bank". Thus you will need a piece of paper that is like a license to start a bank. What is that paper called? And what is the name of the government agency that you would get that paper from?

What is the difference between a hypothesis and a prediction?

hey i just wanted to check if i was going the right way about doing this question i am not sure whether, after what i have already done here, i should then use the radiation equation (the rate at which any object radiates heat) anyway, here is the problem and my answer

I have made calculations with other students and would like to get an "absolute sure answer". We are all not really sure about our answer as they all differ. An adult needs 12mg of zinc per day. An average oyster contains 200 ppm of zinc. How many oysters are required to fulfill the daily intake of zinc for an adult? Respond if you’re absolute sure. Thanks!

Please read the attachments. Thanks, dudes. The teacher just started on this topic, and I am still very unfamiliar with the chapter.

My textbook states that I can deduce the type of acid used to make a salt by analysing its negative ions. Calcium Chloride - CaCl2-----Ca-base ion Cl2-acid ion so you know that by CaO + HCL --> CaCl2 + H2O Then I saw the following: Ammonium sulphate - (NH4)2 S04-----(NH4)-base ion SO4-acid ion 2NH3 + H2O + H2SO4 --> (NH4)2 SO4 +H2O Um...is the 2NH3 dissolved in H2O to give NH3 (aq) [aqueous ammonia] and then added to H2SO4 for neutralisation? I mean, the 2NH3 + H2O is actually mere dissolving but not neutralisation, right? Sorry, guys, I don't know how to write subscripts on the forum....so it is rather hard to see what I am writing.…

Hey all... new to the board here with a question. Posted below is a logic gate setup I have created to solve the problem of having 4 inputs, and one output. The requirements are that the output will be true only when exactly 2 of the 4 inputs are true. Pretty sure I did this right, but I just wanted to double check, and see if there was any simpler method. Thanks!

In distillation, would increasing the heating rate affect the boiling point? Why? Explain in terms of vapour pressure and the pressure of the laboratory.

When bronze is completely dissolved in nitric acid, what colour would the solution be? Is it light blue, because after the reaction, lead (II) nitrate and copper (II) nitrate are formed (I SUPPOSE). As the former is white and the latter is blue, is it light-blue? o_0 Then name one chemical and describe the test that could be used to determine the presence of copper and tin in solution E. Um...for this question, I am clueless! Does tests which work on solid tin and copper work on aqueous ones? Thanks, guys!

If a wave with wavelength 1.5 cm and frequency 8Hz, is viewed through a stroboscope with 6Hz, what's the change of its wavelength? My answer is not identical to what in my text book. My thought is :there is no change of the wavelength, as the time given is enough for the wave to move over one wavelength.

nevermind, sorry, please ignore this thread

I am sorry, but I have just started learning about empirical formulas... An oxide of sulphur is made of 50.0% by mass of sulphur and 50.0% by mass of oxygen. Determine the empirical formula of this compound. Um...they didn't give the mass, I noticed, so I just did this: Element Sulphur--------Oxygen Mass 50.0 (g ?)--------50.0 (g ?) (Should I write grams?) Relative 32.0----------16.0 Atomic Mass No. of 1.56------------3.13 (3 sig. fig.?) moles Molar ratio 1------------2 The empirical formula of an oxide of sulphur is SO2. Am I correct? Please correct my mistakes in my workings if I do …

URGENT HOMEWORK. A farmer has a sack of ammonium nitrate fertiliser. However, he thinks it may be slaked lime, calcium hydroxide instead. How would you prove that it is not slaked lime but ammonium nitrate? Um...do you add sodium hydroxide to ammnium nitrate and warm it to see if ammonia gas evolves so that you know there is ammonium cation present and not slaked lime? Anyway, sorry for always posting homework in other sections. haha, I din't know that here is a place for me to post homework! sorry for the past inconvenience.

Why doesn't an AC motor need a commutator?

I have a question, is there a formula to calculating the average current which flows through an electrolytic cell, using datas that include the following: (a) changes in concentration of [OH-] (b) the volume of the solution © the time of the electrolysis my obtained datas for those three parts are: (a) 4.2e-3 M (b) 30 mL of KI solution © 18 minutes I think it has something to do with figuring out moles of the substance in the solution and from there the moles of electrons tranferred and thus its combined charge. But how do I do it?

hi this answer seems too simple to be true.... i reckon its L/(1-v^2/c^2)^.5 and yeah i don't know what it means by "primary evemts occurring in this measurement"?? Thanks for you help ") Sarah

If the universe wasnt expanding, what will happen regarding a) red shifts in galaxy spectra b) the temperature of cosmic background radiation

HELLO -- I am desperately searching for different viscosities of oils such as almond, aloe vera, apricot, avocado, baby oil, camelina seed, candle, canola, castor, coconut, cottonseed, diesel, corn, grapeseed, flaxseed, fuel, hazelnut, hampseed, jojoba, lubricant, macademia nut, primrose oil, rice bran, sunflower, vegetable, walnut, wheat germ oil.... ANYONE KNOWS - the viscosities of these or - knows a place on the net that I can use to find these out or - a place (Lab) in LA where I can go and measure these oils.... ANY HELP appreciated.. THANX, Celine

(i) how many odd six-digit palindromic numbers are there? (ii) how many odd seven-digit palindromic numbers are there in which every digit appears at most twice?

for the synthesis to be performed in this experiment, based on 1.00 g of copper (II) sulfate pentahydrate (CuSO4) taken initially, what is the theoretical yield of product tetraaminecopper (II) sulfate hydrate? [Cu(NH3)4]SO4 - H2O the amounts of reactants i'm using in this experiment are: 1 g of CuSO4 10 mL of distilled water 5 mL of concentrated NH3 (what does concentrated mean? 1.0 M i'm assuming?) and approximately 10 mL of ethyl alcohol what i have set up as the equation so far: CuSO4 + H2O + 4NH3 --> [Cu(NH3)4]SO4 - H2O does anyone have any idea on how i can calculate theoretical yield of the product? any help/suggestion would be greatly appreciat…

I'm having trouble calculating the pH for the following solution : 10 mL of (0.10M NH3 + 0.10M NH4NO3) + 5 mL H2O + 1 mL 0.10M NaOH Can you help me on how to set up the equations and determine concentrations?

Hey i need answers to these questions: What makes it living where it lives It's complete scientific classification Characteristics that make in unique How it interacts with other organisms in its environment including humans Any other interesting informationA diagram that should be used in your mini poster All about the Borrelia bergdorferi Spirocheate please add all links to sites you use!

"a garden hose is attached to a water faucet on one end and a spray nozzle on the other end. The water faucet is turned on but the nozzle is turned off so that no water flows through the hose. The hose lies horizontally on the ground and a stream of water sprays vertically out of a small leak to a hieght of 0.75m. What is the pressure inside the hose? [ans: 7.4kPa]" i really have absolutely no idea with this question.i know this is to do with bernoulli's equation but i really still don't have a clue. does anyone have any idea? also, "an object executing simple harmonic motion has a maximum speed v[max] and a maximum acceleration a[max], find the period of this mot…

Ok, we got this other question Use the following information to design the experiment and so complete the questions applicable to it a. u are given a substance that you know is a soluble chloride (to be refered to as X.Cl.) b. X is a group 1 cation Perform a first hand investigation to measure and identify the mass ratios of metal to non metals in a compund and calculate the empirical formula Anyone got an idea to a procedure? ... i hope i ain't asking to much, thanks

Can anyone help me with these 2 questions? 1. "You step into an elevator holding a glass of water filled to a depth of 6.5cm. After a moment, the elevator moves upward with constant acceleration, increasing its speed from zero to 2.2m/s in 3.1s." a) During the acceleratrion, is the pressure exerted on the bottom of the glass greater than, less than, or the same as before the elevator began to move? Explain. (I know it should be greater...but I didn't come to that conclusion by thinking in terms of forces, pressure, depth etc...in a physics way. can someone explain it in the "physics" way?) b) Find the pressure exerted on the bottom of the glass as the elev…