Which of the following is not true about beta emissions?
Difference of the atomic number by one between the old element and new element formed
Are written as 0-1e
Cannot penetrate concrete
Less penetrating than alpha emissions

- mmend98

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- mmend98

@Preetha

- mmend98

@taramgrant0543664

- taramgrant0543664

Well which one are you thinking it is?
I'll cross one off for you, beta emissions are unable to pass through concrete but it can pass through something like paper.

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## More answers

- taramgrant0543664

So it is not C

- mmend98

Its asking what it not is. So C would be the answer right?

- Zale101

Here's a hint: Beta particles are high speed electrons, travels faster, and are less heavily ionized than alpha particles.

- taramgrant0543664

C says cannot penetrate concrete so that's true the question asks what is not true

- mmend98

oh lol sorry

- mmend98

Thanks Zale it would be D

- taramgrant0543664

It's ok!

- taramgrant0543664

And yes it would be D

- Zale101

Yes it is D. because since beta particles are less heavily ionized then that makes it more penetrating than alpha particles. Alpha particles are thickly ionized and are less penetrating.

- mmend98

Given the following chemical equation, how many moles of carbon are necessary to react with 5.52 moles of SO2?
5C(s) + 2SO2 (g) arrow CS2 (l) + 4CO (g)
5.52 moles SO2
2.00 moles SO2
13.8 moles SO2
11.0 moles SO2
this one would be 13.8 right ? because the formula is 5.52molesSO2×5molesC2molesSO2=13.8

- Zale101

are you familiar wit mole to mole ratio?

- Zale101

with*

- mmend98

yea im familiar did i do it right ? thats what im asking lol

- Zale101

Yes. Sorry, i did not see it.

- mmend98

thats ok mate

- mmend98

Fusion refers to the splitting of an atomic nucleus into fragments of roughly the same mass amount.
True
False

- taramgrant0543664

13.8 would be correct

- mmend98

- Zale101

What do you think? True or false? Make any educated guess

- Zale101

Search Nuclear Fission and see if it matches the definition.

- mmend98

the educated guess i would make is false

- mmend98

i just never know with this weird wording tbh

- taramgrant0543664

That is referring to fission which is the splitting, fusion is the colliding of atoms

- Zale101

Yep. False because what Tara stated above ^

- mmend98

Given a solution with a pH of 2.8, what is the [H+] of the solution?
2.8 M
6.31 x 10-12 M
1.58 x 10-3 M
11.2 M

- mmend98

this one would be c?

- taramgrant0543664

Yes it would be c
[H+]=10^-2.8
Which gives c

- mmend98

A solution is highly concentrated if there is:
a large volume of solution
a large amount of solvent and a small amount of solute
a large amount of solute and a small amount of solvent
a high density value for the solution

- mmend98

im confused on this one for some reason tara lol

- mmend98

youve been unreal help btw

- taramgrant0543664

Well when you think about it volume of solution doesn't matter because it could be at any volume and density value doesn't make sense for it either. Think about the difference between something dilute and something that is concentrated and that will sort out between B and C

- mmend98

it would be b

- taramgrant0543664

And no problem I enjoy helping and once my SS gets a little higher I am planning on applying for the qualified helper in chemistry so I'm glad to hear that I'm helping!

- mmend98

it would be b right ?

- taramgrant0543664

dilute: a solution that contains a small proportion of solute relative to solvent
concentrated: a solution that contains a large proportion of solute relative to solvent.

- mmend98

oh lol its c

- mmend98

im dumb af

- taramgrant0543664

No you're not it was a little mistake that happens, I've made a lot of mistakes it happens but that's how you learn

- mmend98

Calculate the change in freezing point when 116.8 grams of barium chloride are added to 250 grams of water. Kf = 1.86°C/m; Kb = 0.512°C/m
-4.17°C
-12.5°C
-8.35°C
0°C
last question im stuck on

- taramgrant0543664

ΔT= Kf · m · i
So ΔT is the change in temperature that you solve for
Kf is given
m is the molarity to find this you need to find the moles of barium chloride and you need to convert 250g of water into kg. then you do moles divided by kg of water to find m
i is the van't Hoff dissociation factor so BaCl2 dissociates into Ba2+ +2Cl- let me double check this i, I can't quite remember the rule but the rest is right I'll look it up quick

- taramgrant0543664

So BaCl2 breaks into Ba2+ and 2Cl- so it breaks into 3 parts so i is 3 but NaCl for example breaks into Na+ and Cl- so i=2

- taramgrant0543664

If we put it all together
ΔT= Kf · m · i
ΔT= (1.86)m(3) so m just needs to be found

- mmend98

i got A ?

- taramgrant0543664

How did you get a negative?
What did you get for m?

- mmend98

wait i got D i forgot to multiply one term.

- taramgrant0543664

Oh wait it's suppose to be negative don't mind me it's a little late not really thinking for a second there lol

- mmend98

then i think it has to be a.\

- taramgrant0543664

I got something different what did you get for m?

- mmend98

what did u get then ill check mine over

- taramgrant0543664

I got 2.24 as my m value

- mmend98

i got 5.2

- mmend98

idek how

- taramgrant0543664

116.8g/ molar mass of BaCl2 (208.233)=0.5609
0.5609/ kg of water so 250/1000 this =2.24

- mmend98

i got B

- mmend98

yes your correct

- taramgrant0543664

Yes B would be correct!

- mmend98

Given a solution with a pOH of 13.6, what is the [OH-] of the solution?
13.6 M
2.51 x 10-14 M
0.4 M
3.98 x 10-1 M
would be a?

- mmend98

im sorry if its too late go ahead and have a great night !! u were amazing

- taramgrant0543664

I can check this last one quick for you just give me one sec

- mmend98

thanks Tara

- taramgrant0543664

pOH=-log[OH-]
13.6=-log[OH-]
-13.6=log[OH-]
10^(-13.6)=[OH-]
It's not A

- mmend98

B is what i got

- mmend98

see this is why i ask u ;) haha

- taramgrant0543664

Yes B is correct

- mmend98

so its 2.51 x 10-14 M
?

- mmend98

sweet

- taramgrant0543664

Yes it is!

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