Answers by visitors named: hannah

it is when a a susbstance changes through a permenant change, like endothermic or exothermic and creates at least one new substance. It can't be reversed.

he was hoping for whirled peas (world peace) (:

what texas indusrty, which included companies like texas instruments, grew rapidly in the 1950's?

it is just basic factorising but im not sure how u do it. x2-5x = by the way that is meant to be x squared, minus 5 x. also 3a2 - 6a =

me 2 kamea

i think mectrics are easy but SOMEBODY PLEASE HELP ME I HAVE TO DO THIS FOR SCIENCE!! I REALLY NEED TO KNOW THIS AND NOBODY KNOW EXCEPT MY SCIENCE TEACHER MR.JENKINS!!!!! OMGSH SOME1 PLZ!!!

7 grams is equal to how many kilograms

oh sry, didn't the whole question A gaseous mixture of O2 and N2 contains 32.8% nitrogen by mass. What is the partial pressure of oxygen in the mixture if the total pressure is 665mmHg ? would i start by calculating the number of moles of nitrogen? if so how?

the width of a rectangle is 2cm.the perimeter of the recangle is 16cm. what is the length of the rectangle?

i have to do patterns. the pattern is 17_ 33_ _ 27 have no concept to follow

well cc is supposed tobe c with an exponite of two but i did not know how to write it and then it had d next to it but i don't know it said find the gcf of the set of monomials and that's how it was writen exept for the exponet

omg i need to figure out what this means for my exam!!! what does it mean? i don't get it

who was the first child born in the mayflower while crossing in the americas

plz help me? i need to know what acids there arein oven cleaners. help!

quit

thanks

thanks is it K3PO4?

what kind of activity can you write about that's esy so you can explaun derections

i'm still confused please help me

Well I didn't understand it I have the following options: 6m 4m 3m (50+60)m

is the answer 11.8 m/s ?

why do eskimos wash their clothes in tide? Don't understand what the answer is

Thank you, Angel

I don't understand, can you give me an example when prime factorization is necessary and when it is not?

Oh okay so all you did was multiply 18 and 6 to get 108... but why did (y)get tied to 6?...Can you show me the steps on how to write the expression

okay thank you Ms. Sue

thank you Reiny:)

he has a very strong id and a weak super ego

i meant james im sorry.. but i solved the problem on my own thank u tho

10.817 (tenths, hundredths, thousandths, etc.)

Thank you Laren

(x-3)(x^2+x-7)

and also. A car seat fades with extended exposure to sunlight. thats chemical not physical right?

you are right!<:

thank you so much!!

oh, would it be 24 (two sig figs) cause in the problem 43 has the least number of sig figs(2) or do we go by this equation: 343,000 = 43,000 x 4.184 x (Tf-22.1) = 0 and use 3 sig figs?

thanks. what about: block of aluminum with a volume of 98.2 cm3 absorbs 67.4 J of heat. If its initial temperature was 32.5 °C, what is its final temperature? (density of aluminum = 2.70 g/cm3) I know i have to change the volume to grams. but i don't know how to lay out the problem

huh? what set up that u did? wait r u bobpursley?

estimated population

10m/s i believe and that is going up and down if you neglect air resistance

oops the numbers after the 1,2,3 etc. are suppose to be in the right column

the answer would be: -36s^2q. the s is squared and the q not because your multi. SQ*3S. so there are 2 S's but only one q.

the scientific notation would be: 8.17X 10^7 in scientific notations the decimal always has to be after the first non-zero number

2w-4/2w the only factor of 1 is 1. I dontknow how they want you to solve this with only factors of one. but you could divide both sides by 2. so you get w-2w

42/56 in simplest form

The molality of a solute is the number of moles of that solute divided by the weight of the solvent in kilograms

nevermind i got the answer but i do have another question: A salt crystal has a mass of 0.40 mg. How many NaCl formula units does it contain?

so do i have to convert .4 mg to grams first? that would be .0004 right? so then i just divide .004/58.44 and that will be my answer?

thanks so much!

a)a-there b)d- a pencil

so it would be .000006845 formula units?

first we want to get the like terms on the same side. so lets subtract 3 from both sides you get -4=4x then since we want x by itself we divide by 4 on both sides making the 4 cross out and we get -1=x

1. Cuzco 2. are there many? this is what i found. In 1528, Emperor Huayna Capac (Young Lord) ruled the Inca Empire 3.Mound Builders

substract 3 from the right side and left eg- -1=3+4x -3 -3 then divide by 4 on the right and left side. eg- -4/4=4x/4 x=-1

I used that answer and it was wrong. we have a practice version : the question was A salt crystal has a mass of 0.18 mg. How many NaCl formula units does it contain? and the answer was 1.9e+18 formula units. so wouldn't the answer for my question be in the positive exponents?

the first 3 are def. correct. for the last one it seems like many could work. im not sure about that one either sorry but if i had to guess id think either a or b

i got the answer. thanks anyways!

shouldn't it be less than the 4.7 g of silver plating??

so the mass would be 6.24g?

oh i see! thanks

5^3= 5x5x5= 125 5^7=5x5x5x5x5x5x5= 78125

thats a little helpful but im kinda looking more for why the slang was used. was it easier for them?faster? and how did it all start up? did the soldiers just start using the words and everyone learned them? things like that

(a) 264 (b) 461.49 (c) 0

thanks!!!

unless you just look to the next chapter of your text book if its something like math and you read that and try to understand it.

oh. sorry i didn't see my other post was answered thanks

so what i have so far is: 6-CO2(g) + 12- H2O(l) -> 1-C6H12O6(aq) + 6- O2(g) it said all the coefficients were correct except the 12 in front of the H20 how is that wrong?

I got most of it but there is one coefficient its counting wrong. i posted my problem on the previous post. would you like me to post it here also?

thanks! i didn't see the 2 after the H

nevermind i got it

well it has to end in 0 to be divisible by 10. I got:360 because 8 and 9 both go in evenly

can you explain more? i put the cation was Na3+ and the anion was PO4-. but it said it was wrong. what am i doing wrong?

I put Na+ as the cation and it counted it wrong. also. are you saying PO4- is the anion? cause i got it wrong. and what do the noble gases have to do with the ions. sorry im asking many questions

it says those answers are wrong

this is what it says: For the soluble compounds, write the ions present in solution. this is the soluble compound: Na3PO4 then it has 2 boxes one called cations and one called anions

I would say D also :)

thanks sooo much!!

use the a^2 + b^2 = c^2 c being the length of the hypotenuse

thanks so for this equation: HC2H3O2(aq) + Ca(OH)2(aq) -> H2O(l) + find the formula here the last part would be CaOC2H3O2? im a little confused. did the O fromt he H2O come from (OH)2?

48 is another one

The main teachers that are on this site that specialize in your subject just might not be on around this time. be patient and give it time and im sure someone will be able to help :)

oh i got it:) thanks:)

oh thanks sooo much:)

so is it just synthesis?

oh theres an arrown after Br2

oh sorry i miss read what you put. thanks

thanks. so would it be double displacement and acid-base?

thanks you so much. Also if i may ask im having trouble on another type of problem balancing this equation: C5H12O(l) + O2(g) --> H2O(g) + find the compound here I am able to balance it but i need to find the last compound i though it would be: C5H10O2 because i took out 2 H's and 1 O. but it was wrong

oops sorry

its not also a precipitation os single-displacement??

or acid- base? because i did gas evolution oxidation-reduction precipitation single-displacement but got it wrong so I am thinking either one of those has to be taken out and/or acid-base added

could it also be an acid-base?

I got it:) it was just not a precipitate:) Thankyou sooooo much:)

also the word valley on page 174( at least in my book) its in the context that reads "the king said the cubby would do for his valley- meaning me"

can you find the music online? Why not just ask her for another copy when you get to school tomorrow and tell her what happened

im sorry your link/document doesnt work

sam..? im assuming just like the others we cannot see your documents so we don't know what the picture looks like. sorry

2Al(s) + 2NaOH(aq) + 2H2O(l) 2NaAlO2(aq) + 3H2(g) (unbalanced) sorry i forgot. it was unbalanced but then i balance it

thanks so its 5.21 L h2?

thanks for the help: can you help me with another one? Some sulfuric acid is spilled on a lab bench. It can be neutralized by sprinkling sodium bicarbonate on it and then mopping up the resultant solution. The sodium bicarbonate reacts with sulfuric acid as follows. 2 NaHCO3(s) + H2SO4(aq) --> Na2SO4(aq) + 2 H2O(l) + 2 CO2(g) Sodium bicarbonate is added until the fizzing due to the formation of CO2(g) stops. If 34 mL of 6.0 M H2SO4 was spilled, what is the minimum mass of NaHCO3 that must be added to the spill to neutralize the acid? i got 5.7 and it said my answer was off by more than 10%