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meriva
3 years ago
6

Is roasting a marshmallow a Chemical or Physical reaction?

Chemistry
2 answers:
svetoff [14.1K]3 years ago
8 0
I'm going to go with Physical.
Verdich [7]3 years ago
7 0
It's a chemical reaction. Usually when the color changes, it indicates a chemical reaction. Keep in mind that color is a physical property.
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Which of the following is a molecule but
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Answer:

CO2

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149.3 g of H2O at 95 ◦C is poured over 412 g Fe at 5 ◦C in an insulated vessel. What is the final temperature? The specific heat
abruzzese [7]
You are correct, but you needn't worry about the signs so much. Just remember that the negative sign is used to denote a loss of energy; since the water is hotter, it will be losing energy (-Q) and the iron will gain energy (Q). Now, we substitute the values:
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Which element gains two electrons to fill its outermost energy level?
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4 0
2 years ago
What is the osmotic pressure, in torr, of a 3.00% solution of NaCl in water when the temperature of the solution is 45 ºC? Enter
Anit [1.1K]

213034 torr is the osmotic pressure.

Explanation:

osmotic pressure is calculated by the formula:

osmotic pressure= iCrT

where i= no. of solute

c= concentration in mol/litre

R= Universal Gas constant

T = temp

It is given that solution is 3% which is 3gms in 100 ml.

let us calculate the concentration in moles/litre

3gm/100ml*1000ml/1L*1mol NaCl/55.84g NaCl

= 5.372 gm/litre

Putting the values in the formula,                   Temp in Kelvin 318.5K

osmotic pressure= 2*5.372*0.083 * 318.5                 Gas constant  0.083

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                                                                                    i=2 for NaCl

4 0
3 years ago
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