Homework Help

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…

We have another debate - and again, we have the slightly harder side. My team and I were wondering if anyone here had any ideas? The motion is that "Organ Donations should be prioritised to those who have had a healthy lifestyle." We're negating. That is - we're saying that we should give organs to those who need them the most and NOT to those who lead "healthy lifestyles" We're thinking of arguing it from a slightly moralistic perspective. Does anyone have any ideas at all?

hey, just need some help here this for some school assignment. We made our own Solder by melting tin and lead in the correct ratio. Now we need to remelt the Solder to find its melting point. Look i now this might sound stupid, but what is the most accurate method of findng the melting point. this is very impotant, there are 2 questions about it that pop-up in this in this assignment: 1> Suggest a suitable technique and sound experimental practise that should be used so the reasonably low melting point can be accurately measured and confirmed 2> What changes did you make to the procedure in this experiment in an attempt to gain more accurate results. (It i…

Four point charges, each of magnitude q are located at the corners of a sqaure with sides of length a. Two of the charges are +q and two are -q. The charges are arranged in one of the following two ways: 1. The charges alternate in sign (+q,-q,+q,-q) as you go around the sqaure. 2. The top two corners of the square have positive charges (+q,+q) and the bottom two corners have negative charges (-q,-q). a) Which case will the electric field at the centre of the square have the greatest magnitude? b) Calculate the electric field at the centre of the square for each of these two cases. I really have no idea for the parts of this question. Can any1 give me any star…

"A point charge q = -0.35nC is fixed at the origin. Where must an electron be placed in order for the electric force acting on it to be exactly opposite to its weight? (Let the y axis be vertical and x axis be horizontal)" [ans: 240km above q] my question is, i've found 240km using coloumb's law...but im not sure about the direction...how com the answer is 240km "above q"??

If 50.75g of a gas occupies 10.0L at STP, what will be the volume in L occupied by 129.3 of the gas at STP?

hi, could someone that has done gcse mathematics coursework or similar tell me or point me in the right direction of the advantages and disadvantages of using the mean and median? thanks