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Jlenok [28]
3 years ago
7

Helpp chemistry ..........

Chemistry
1 answer:
ValentinkaMS [17]3 years ago
3 0
Half-life is the time it takes for the radioactive material's mass to decrease by half.

So, half of 96 is 48
half of 48 is 24
half of 24 is 12
half of 12 is 6

96->48->24->12->6

You count how many arrows (->) there is.
Which is 4

Then you use the 12 minutes the question gave you to do:
12 divided by 4
= 3

So, one half-life (Or the time it takes for the radioactive material's mass to decrease in half) is 3 minutes

and every 3 minutes it will decrease by half.
You might be interested in
All of the alkali earth metals, Group 2, have two valence electrons. Which of these would represent the oxidation number of the
juin [17]
Your answer should be C.) +2. "All the elements in Group 2 have two electrons in their valence shells, giving them an oxidation state of +2." 


Credits: https://chem.libretexts.org/Core/Inorganic_Chemistry/Descriptive_Chemistry/Elements_Organized_by_Blo...

Hopefully this has helped! :)
5 0
3 years ago
(10 points) You have a sample of 63.5g of C2H6. How many moles of C2H6 are in the sample? Show work
Nikitich [7]

Answer:

30.06904

Explanation:

C3H4: Mass % C = 36.033 x 100 / 40.0641 = 89

7 0
3 years ago
Write the electron configuration and Noble gas configuration for each element.
cestrela7 [59]

Answer:

1is the answer to that one day F

7 0
3 years ago
I need help with these two
bearhunter [10]

Answer:

6. d,  7. a

Explanation:

6. Molarity is a number of moles solute in 1 L solution.

7. 1 L solution - 2.5 mol K2CO3

 20 L             - x mol K2CO3

x  =20*2.5/1 = 50 mol K2CO3

Molar mass(KCO3) = M(K) + M(C) + 3M(O)= 39 +12 +3*16= 99 g/mol

99 g/mol *50 mol = 4950 g KCO3 Closest answer is A.

Actually KCO3 does not exist, in reality it should be K2CO3.

3 0
3 years ago
What type of rock is a obsidian , marble, and a conglomentary rock
laiz [17]

Hi There!

Obsidian - Igneous Rock

Marble - Metamorphic Rock

Conglomentary - Sedimentary Rock

Hope This Helps :)

6 0
4 years ago
Read 2 more answers
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