CHEMISTRY MIDDLE SCHOOL

A pogo stick bounces 30 M in 10 secs what is the bouncers average speed?

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Answer 1
Answer:

three  i hope this helps
Answer 2
Answer: i would love to help but it is 3 or is it 3 million?

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The greenhouse effect A. is caused by pollution released into the atmosphere
B. does not occur naturally
C. is a naturally occurring process
D. needs to be reversed to save the planet

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The greenhouse effect C. is a naturally occurring process. What many people fail to realize is that the greenhouse effect is what keeps our Earth warm and habitable for us to live on. Without the greenhouse effect, the Earth would be colder and would not be able to sustain life.

Need help please i need a good grade will give more points if correctly answered

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The answer is 5. Sulfur, iron, copper, gold, and aluminum are elements.

How many moles of nitrogen we have at a temperature of 30 ºC, a pressure of 4.0 atm, and a volume of 4000.mL?

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Answer:

0.643 mol.

Explanation:

  • We can use the general law of ideal gas: PV = nRT.

where, P is the pressure of the gas in atm (P = 4.0 atm).  

V is the volume of the gas in L (V = 4000 mL = 4.0 L).  

n is the no. of moles of the gas in mol (n = ??? mol).

R is the general gas constant (R = 0.0821 L.atm/mol.K),  

T is the temperature of the gas in K (T = 30ºC + 273 = 303 K).

∴ n = PV/RT = (4.0 atm)(4.0 L)/(0.0821 L.atm/mol.K)(303 K) = 0.643 mol.

Why do you need a reference point to know if an object is moving

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to measure the distance and velocity 

What is responsible for the changes that we see in the Moons shape

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As the moon like orbits earth,it changes phases in an orderly way.

Which is a defining trait of a mineral?

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traits  which are used to identify and describe mineral species.
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