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notka56 [123]
2 years ago
15

Which of the following is evidence of a physical change?haora

Chemistry
2 answers:
Tatiana [17]2 years ago
5 0

Answer:

a Change in size

Explanation:

Arisa [49]2 years ago
3 0
Chopping wood
ripping pants
breaking something in half
molding clay
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Which of these actions is the BEST evidence that waves can cause objects to move?
Thepotemich [5.8K]
The answer is C: A surfer rides back to the beach on his surf board.

All the others are examples of people doing stuff to the water, C is an example of the water moving something, in this case the water is moving a surfer and his surf board.
8 0
3 years ago
Read 2 more answers
A gas occupies the volume of 215ml at 15C and 86.4kPa?
kherson [118]

Answer:

About 0.1738 liters

Explanation:

Using the formula PV=nRT, where p represents pressure in atmospheres, v represents volume in liters, n represents the number of moles of ideal gas, R represents the ideal gas constant, and T represents the temperature in kelvin, you can solve this problem. But first, you need to convert to the proper units. 215ml=0.215L, 86.4kPa is about 0.8527 atmospheres, and 15C is 288K. Plugging this into the equation, you get:

0.8527\cdot 0.215=n \cdot 0.0821 \cdot 288\\n\approx 7.754 \cdot 10^{-3}

Now that you know the number of moles of gas, you can plug back into the equation with STP conditions:

1V=7.754 \cdot 10^{-3} \cdot 0.0821 \cdot 273\\V\approx 0.1738L

Hope this helps!

3 0
3 years ago
Explică rolul chimiei în protejarea mediului înconjurător?
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Answer:

Chimia ne poate ajuta să înțelegem, monitorizăm, protejăm și îmbunătățim mediul din jurul nostru. Chimiștii dezvoltă instrumente și tehnici pentru a ne asigura că putem vedea și măsura poluarea aerului și a apei.

Explanation: I speak english i just know Romanian language

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3 years ago
2.
Zepler [3.9K]

Answer:2170

Explanation:

8 0
3 years ago
What is it called when liquid changes state to a gas?
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Boiling point
i hope this helps.
6 0
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