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gizmo_the_mogwai [7]
3 years ago
6

Help school so annoying

Chemistry
1 answer:
hichkok12 [17]3 years ago
3 0

Answer:

I think its scenario 2 Guitar strings

Explanation:

"You move your fingers and arm to play the guitar! This energy was stored in the molecules inside your muscles and now is being used to move your fingers which, in turn, transfers energy to the strings of the guitar. Now the strings are vibrating, having kinetic energy,"

I searched this up, if you answer requires an explanation put this in your own words.

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A sample of ideal gas at room temperature occupies a volume of 10.0 L at a pressure of 302 torr. If the pressure changes to 1510
NISA [10]

Explanation:

boyles law; P1V1=P2V2

302×10=1510×V2

V2=2L

8 0
3 years ago
How many joules must be added to a 1000 g iron skillet to increase its temperature
kap26 [50]

Answer:

B) 101,025

Explanation:

1000g * 0.449 J/g Celsius * 225 Celsius = 101,025

I got 225C from 250C - 25C

4 0
3 years ago
Discuss three evidences that confirm that air is a mixture and not a compound​
s2008m [1.1K]

Answer:

the air contains nitrogen carbon dioxide oxygen and many other gases

6 0
3 years ago
What is the ph of a soft drink in which the major buffer ingredients are 6.6 g of nah2po4 and 8.0 g of na2hpo4 per 355 ml of sol
Volgvan
First, we need to get the concentration of  [NaH2PO4]:
[NaH2PO4] =( mass / molar mass ) * volume L
when we have mass NaH2PO4 = 6.6 g & molar mass = 120g/mol & V = 0.355 L
So by substitution:
[NaH2PO4] = (6.6g / 120g/mol) * 0.355 L = 0.0195 M

then, we need to get the concentration of [Na2HPO4]:
[Na2HPO4]= (mass / molar mass ) * volume L
So by substitution:
[Na2HPO4] = (8g/ 142g/mol) * 0.355 L = 0.02 M

and when Pka of the 2nd ionization of phosphoric acid = 7.21 
So by substitution in the following formula, we can get the PH:

PH = Pka + ㏒[A]/[AH]

∴PH = 7.21 + ㏒[0.02]/[0.0195]
∴ PH = 7.2
4 0
4 years ago
Which phrase best describes heat?
4vir4ik [10]

Answer:

C) the energy transferred between objects t different temperatures

3 0
3 years ago
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