Question

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

Answer 1

@Preetha

Answer 2

@taramgrant0543664

Answer 3

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.

Answer 4

So it is not C

Answer 5

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

Answer 6

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

Answer 7

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

Answer 8

oh lol sorry

Answer 9

Thanks Zale it would be D

Answer 10

It's ok!

Answer 11

And yes it would be D

Answer 12

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.

Answer 13

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

Answer 14

are you familiar wit mole to mole ratio?

Answer 15

with*

Answer 16

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

Answer 17

Yes. Sorry, i did not see it.

Answer 18

thats ok mate

Answer 19

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

True
False

Answer 20

13.8 would be correct

Answer 21

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

True
False

Answer 22

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

Answer 23

Search Nuclear Fission and see if it matches the definition.

Answer 24

the educated guess i would make is false

Answer 25

i just never know with this weird wording tbh

Answer 26

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

Answer 27

Yep. False because what Tara stated above ^

Answer 28

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

Answer 29

this one would be c?

Answer 30

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

Answer 31

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

Answer 32

im confused on this one for some reason tara lol

Answer 33

youve been unreal help btw

Answer 34

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

Answer 35

it would be b

Answer 36

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!

Answer 37

it would be b right ?

Answer 38

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.

Answer 39

oh lol its c

Answer 40

im dumb af

Answer 41

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

Answer 42

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

Answer 43

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

Answer 44

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

Answer 45

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

Answer 46

i got A ?

Answer 47

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

Answer 48

wait i got D i forgot to multiply one term.

Answer 49

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

Answer 50

then i think it has to be a.\

Answer 51

I got something different what did you get for m?

Answer 52

what did u get then ill check mine over

Answer 53

I got 2.24 as my m value

Answer 54

i got 5.2

Answer 55

idek how

Answer 56

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

Answer 57

i got B

Answer 58

yes your correct

Answer 59

Yes B would be correct!

Answer 60

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?

Answer 61

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

Answer 62

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

Answer 63

thanks Tara

Answer 64

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

Answer 65

B is what i got

Answer 66

see this is why i ask u ;) haha

Answer 67

Yes B is correct

Answer 68

so its 2.51 x 10-14 M
?

Answer 69

sweet

Answer 70

Yes it is!