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sergejj [24]
3 years ago
12

I NEED AN ANSWER RIGHT NOW!!! ILL GIVE BRAINLIEST TO FASTEST ANSWER!

Chemistry
1 answer:
Novay_Z [31]3 years ago
8 0

Answer:

Explanation:

hi there someone reported my answer

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I need help pleaseeee
solmaris [256]

Answer:

1 is H

3 is NA

the one below 14 is SI

16 is O

the one below 17 is Ci

the one below 18 is NE

Explanation:

hope this helps!

6 0
3 years ago
Read 2 more answers
Iodine-131 half life 8.040 how long will it take for a 40 gram sample of iodine-131 to decay to 0.75 grams
otez555 [7]

Answer:

See explanation below

Explanation:

To get this, we need to apply the general expression for half life decay:

N = N₀e(-λt)    (1)

Where:

N and N₀ would be the final and innitial quantities, in this case, masses.

t: time required to decay

λ: factor related to half life

From the above expression we need λ and t. To get λ we use the following expression:

λ = t₁₂/ln2   (2)

And we have the value of half life, so, replacing we have:

λ = 8.04 / ln2 = 11.6

Now, we can replace in (1) and then, solve for t:

0.75 = 40 exp(-11.6t)

0.75 / 40 = exp(-11.6t)

ln(0.01875) = -11.6t

-3.9766 = -11.6t

t = -3.9766 / -11.6

<h2>t = 0.34 days</h2><h2></h2>
3 0
3 years ago
How are archaeological finds dated?
Paladinen [302]

Explanation:

Archaeologists use that assumption, called the law of superposition, to help determine a relative chronology for the site itself. Then, they use contextual clues and absolute dating techniques to help point to the age of the artifacts found in each layer.

7 0
3 years ago
Read 2 more answers
Two liquids are known to be miscible. They are placed in a beaker and shaken. Which of the following describes what will happen?
Karolina [17]

If they are miscible, they will mix together. They don't necessarily make a new compound. It is sort of like a dilution problem. You can mix say water and antifreeze. You don't get a chemical reaction.

No solidification occurs.

There are no layers.

There is no chemical reaction.

Answer: they will form a solution

7 0
3 years ago
Read 2 more answers
When are the products of an equalibrium reaction favored
Leviafan [203]
For exothermic reaction (that is heat is considered as a product) then
 reactants= product + Energy ,

An decrease in temperature  favors the forward reaction (more product formed)

pressure depends on number of mole of the product and reactants

a A + b B + c C + d D (Where a b c and d are numerical value and A B C and D are compounds) :
if more A is added to the equilibrium mixture, equilibrium position will shift to the right (more product formed) so as to decrease concentration of A
4 0
3 years ago
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