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mel-nik [20]
3 years ago
11

Edpuzzle

Chemistry
1 answer:
Tanzania [10]3 years ago
7 0
What are the options
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A scientist digs up sample of arctic ice that is 458,000 years old. He takes it to his lab and finds that it contains 1.675 gram
Fiesta28 [93]

Answer:

6.70 grams of krypton-81 was present when the ice first formed

Explanation:

Let use the below formula to find the amount of sample

N= N_0(\frac{1}{2})^n

where

n = \frac{t}{t_{\frac{1}{2}}}

here

t =  458,000 years

t_{\frac{1}{2}} = 229,000

\frac{t}{t_{\frac{1}{2}}} = \\frac{ 458,000}{229,000}

n = \frac{t}{t_{\frac{1}{2}}} = 2.000

Now substituting the values

1.675 = N_0(\frac{1}{2})^{2.000}}

1.675 = N_0\times (0.2500)

N_0= \frac{1.675}{0.2500}

N_0=6.70

3 0
3 years ago
Iron is listed below zinc in the activity series.
ololo11 [35]

Answer:

B

Explanation:

6 0
3 years ago
Plz HELP I NEED THIS NOW!!!!!!!!!<br><br><br> What landscape region is Long Island located on?
Kobotan [32]

The landscape region  of Long Island is the Atlantic coastal plain.

4 0
3 years ago
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What is the defination of epsom salt?
prisoha [69]
Crystals of hydrated magnesium sulfate used as a purgative or for other medicinal use


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7 0
3 years ago
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Boron is to the immediate left of carbon in the same row in the periodic table. Which of the following statements compares the r
natita [175]

Answer:

Boron has a larger radius and the protons in carbon exert more pull.

Explanation:

Remember than elements have greater radius as they are closer to the bottom left corner, so boron would have the larger radius here. Carbon has a smaller radius, which makes it easier for the protons in carbon to exert more pull.

7 0
3 years ago
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