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taurus [48]
4 years ago
10

Is aluminum foil a compound element or mixture?

Chemistry
1 answer:
timurjin [86]4 years ago
5 0
Aluminum is an element.  If there's nothing else in the foil
besides aluminum, then the foil is entirely an element.
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The pressure of a 250 mL sample of gas is 105 kPa. What would be the pressure if the volume were increased to 375 ml?
Arte-miy333 [17]

Answer:

<h2>The answer is 70 kPa</h2>

Explanation:

In order to find the pressure if the volume were increased to 375 ml we use Boyle's law

That's

P_1V_1 = P_2V_2

where

P1 is the initial pressure

P2 is the final pressure

V1 is the initial volume

V2 is the final volume

Since we are finding the final pressure

P_2 =  \frac{P_1V_1}{V_2}  \\

From the question

P1 = 105 kPa = 105 , 000 Pa

V1 = 250 mL

V2 = 375 mL

So we have

P_2 =  \frac{105000 \times 250}{375}  =  \frac{26250000}{375}  \\  = 70000

We have the final answer as

<h3>70 kPa</h3>

Hope this helps you

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4 years ago
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Explanation:

Matter also exhibits physical properties. Physical properties are used to observe and describe matter. Physical properties can be observed or measured without changing the composition of matter. These are properties such as mass, weight, volume, and density.

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3 years ago
You need to produce a buffer solution that has a ph of 5.16. you already have a solution that contains 10. mmol (millimoles) of
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PH= pKa + log( conjugate base/ conjugate acid)
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Answer:

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it's because calcium in the periodic table is located in group 2

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