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lutik1710 [3]
2 years ago
7

Which unstable element is used to determine the age of volcanic rock?

Chemistry
2 answers:
Len [333]2 years ago
8 0

Answer:

C

Potassium

Explanation:

Just took test on Ed2020

77julia77 [94]2 years ago
6 0

<em><u>Answer:</u></em>

Potassium.

<u><em>Explanation:</em></u>

Therefore, the answer is Potassium. You might think, that because we were talking about Argon as well, the answer is both of them, but no. Everything starts with Potassium but it decays into Argon during the process.

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How do you find percentage yeild​
ch4aika [34]

Answer:

To calculate the percentage of a specific number, you first convert the percentage number to a decimal. This process is the reverse of what you did earlier. You divide your percentage by 100. So, 40% would be 40 divided by 100.

Explanation:

4 0
3 years ago
I am very confused, our teacher didn’t properly teach us this. How do you do it?
Fudgin [204]

Answer:

You multiply the 3 numbers together to get your volume, in this case it would be 4058.488 cm^3 (cm cubed)

so

V: 4058.488cm^3 ( round up to 4058.5 for convenience)

M: 27579

D: ?

So we divide mass by the volume to get density, which is

27579 / 4058.5 = ~6.79536 (can round up to 7 or 6.8)

This graph can help a lot, so maybe try and memorize it, hope I helped.

3 0
2 years ago
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How is 6.3 written in scientific notation?
Leokris [45]
6.3 × 10^0
In scientific notation, the numerical value without the exponent of 10 must be within the range from 1 to just below 10 (for example, 9.99...). In this case, 6.3 is already within this range, so we just have to multiply it by 1. To get a multiplier of 1 using base 10, we would have to raise 10 to the zeroth power.

8 0
3 years ago
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How many grams of lithium nitride needs to react with excess water at stp to produce 15.0 l of ammonia
anzhelika [568]

Answer:

Mass = 24.4 g

Explanation:

Given data:

Mass of lithium nitride needed = ?

Volume of ammonia = 15.0 L

Solution:

Chemical equation:

Li₃N + 3H₂O   → NH₃ + 3LiOH

One mole = 22.414 L

We will compare the volume of lithium  nitride and ammonia.

                                NH₃             :            Li₃N

                              22.414           :              22.414

                               15.0              :               15.0  

Number of moles of lithium nitride:

PV = nRT

n = 1 atm ×15 L / 0.0821 atm.L / mol.K × 273 K

n = 15 /22.41 /mol

n =0.7

Mass of Lithium nitride:

Mass = number of moles × molar mass

Mass = 0.7 mol × 34.83 g/mol

Mass = 24.4 g

5 0
3 years ago
How are chemical reactions used in cooking? What are the chemicals used?
Irina18 [472]
When you are making a cake "for example" you put all the ingrediants together.. thrn put it in the oven.. the combination that makes the cake look like that or that combines the ingrediants together is by chemical reaction.
8 0
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