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harina [27]
3 years ago
9

14. Which of the following groups is most at risk for developing this disease?

Chemistry
1 answer:
ki77a [65]3 years ago
8 0

Answer: c

Explanation: built different

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What structure what structural feature of cells can allow molecules to flow directly from the inside of one cell to the inside o
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The answer is A. Plasmodesmata. It's a narrow pathway between cells.
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3 years ago
A chemistry student measured the boiling point of naphthalene (C10 H8) at 231.0°C. What is the
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Explanation:

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6 0
3 years ago
You are dating Moon rocks based on their proportions of uranium-238 (half-life of about 4.5 billion years) and its ultimate deca
Aliun [14]
1. Use the formula:

-kt = ln[\frac{FinalAmount}{InitialAmount}]

k = ln2 / half-life

So, t = - \frac{4.5}{ln2} \times ln[\frac{0.55}{1}]

t =  3.8 billion yr

2.  Same formula:

t = - \frac{4.5}{ln2} \times ln[\frac{0.63}{1}]

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8 0
3 years ago
For the reversible reaction. A(g) = B(g). which K values would indicate that there is more B then A at equilibrium? a)K=7x10^-9.
yanalaym [24]

Answer is both (b) and (d).


<em>Explanation;</em>


Equilibrium constant is written as a ratio between concentrations of products and reactants.


The equilibrium reaction is

A(g) ⇄ B(g)


Hence, the equilibrium constant can be expressed as

K = [B(g)] / [A(g)]


If there is more B, then A should be less. Hence, K value would be more than 1.

Hence, according to the given choices, K = 4000 and K = 1 x 10⁶ can be taken as correct answers.


6 0
4 years ago
Read 2 more answers
Calculate the number of moles of BaF2 in a 10.0 g sample of BaF2.
UkoKoshka [18]

Answer:

The number of moles = 0.06 moles

Explanation:

i) Formula

Number of moles = Mass of the sample ÷ Molar masses of the substances

ii) Number of moles = 10.0 ÷ (137)+(19×2)

= 10.0 ÷ 175

= 0.06 moles

5 0
4 years ago
Read 2 more answers
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