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sweet-ann [11.9K]
3 years ago
9

Complete the paragraph below. Do it using your Science journal or notebook

Chemistry
1 answer:
svetlana [45]3 years ago
3 0

Answer:

SUSPENSION IS A KIND OF MIXTURE where particlea are visible to the naked eyes AS IT settled AT THE BOTTOM WHEN LEFT UNDISTURBED.

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Thorium-234 has a half-life of 24.1 days. How many grams of a 150 g sample would you have after 120.5 days?
chubhunter [2.5K]

Answer:

8.625 grams of a 150 g sample of Thorium-234  would be left after 120.5 days

Explanation:

The nuclear half life represents the time taken for the initial amount of sample  to reduce into half of its mass.

We have given that the half life of thorium-234 is 24.1 days. Then it takes 24.1 days for a Thorium-234 sample to reduced to half of its initial amount.

Initial amount of Thorium-234 available as per the question is 150 grams

So now  we start with 150 grams  of Thorium-234

150 \times \frac{1}{2}=24.1

75 \times \frac{1}{2} =48.2

34.5 \times \frac{1}{2} =72.3

17.25 \times \frac{1}{2} =96.4

8.625\times \frac{1}{2} =120.5

So after 120.5 days the amount of sample that remains is 8.625g

In simpler way , we can use the below formula to find the sample left

A=A_{0} \cdot \frac{1}{2^{n}}

Where

A_0  is the initial sample amount  

n = the number of half-lives that pass in a given period of time.

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Which of the following is a polyatomic ion?<br> O A. HCI<br> O B. Na<br> O C. PO,<br> O D. 52
timurjin [86]

I'm not the best with science but I believe the answer is B. Na.

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Why are polar bears listed as a threatened species?
IceJOKER [234]
Because their species is in danger of going extinct<span />
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What is the temperature in degrees Celsius on the thermometer below?​
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Answer:

\pmb{ option ~C}

Explanation:

The correct answer of this questions is 38°c

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What type of volcano will most likely form when an eruption takes place with explosive force and layers of ash accumulate? I WIL
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A.) A cinder cone vocano

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Cinder cone volcanos give off more ash, rather then an explosion, hense the name "cinder cone".

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