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AleksandrR [38]
3 years ago
6

True or false - Evaporating, condensing, melting and freezing are all examples of chemical change.

Chemistry
2 answers:
Fittoniya [83]3 years ago
3 0
False because they can turn back to their original form a chemical change would be like burning paper it can’t be changed back to it’s original offer it’s burnt
S_A_V [24]3 years ago
3 0

Answer:

false

Explanation:

Because these examples are able to turn back into their original form. For example, melted ice can refreeze.

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sveticcg [70]
It stabds for Iron.
6 0
3 years ago
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When 1.20 moles of MgO reacts as completely as possible with 0.900 moles of NaCl, the total number of moles of reaction products
svetoff [14.1K]

Answer:

Explanation:

limiting reactant is NaCl it is consumed completely)

calculate n for each product

  n NaCl (mole )                 n MgCl2(mole )

    2                                                1

    0.9                                              x

        x = 0.45 mole

 n NaCl                          n Na2O

  2                                      1

   0.900                    x

 x = 0.45 mole

  the total number of moles of reaction products is: 0.45 + 0.45= 0.9mol

 

4 0
3 years ago
A person tries to heat up her bath water by adding 5.0 L of water at 80°C to 60 L of water at 30°C. What is the final temperatur
Ratling [72]

Answer:T_f=33.85\°C

Explanation:

Hello,

In this case, we can write the following relationship, explaining that the lost by the hot water is gained by the cold water:

Q_{hot,W}=-Q_{cold,W}

Which in terms of mass, specific heat and temperatures, we have:

m_{hot,W}Cp_{W}(T_f-T_{hot,W})=-m_{cold,W}Cp_{W}(T_f-T_{cold,W})

Whereas the specific heat of water is cancelled out to obtain the following temperature, considering that the density of water is 1 kg/L:

T_f=\frac{m_{hot,W}T_{hot,W}+m_{cold,W}T_{cold,W}}{m_{hot,W}+m_{cold,W}}\\\\T_f=\frac{5.0kg*80\°C+60kg*30\°C}{5.0kg+60kg} \\\\T_f=33.85\°C

Regards.

4 0
3 years ago
What are 2 interactions between the earth spheres and the carbon cycle?
Fed [463]

Answer:

Explanation:

The spheres interact with each other, and a change in one area can cause a change in another. Humans (biosphere) use farm machinery manufactured from geosphere materials to plow the fields, and the atmosphere brings precipitation (hydrosphere) to water the plants. The biosphere contains all the planet's living things.

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3 years ago
Mushrooms have gills?
Mars2501 [29]
Mushrooms do have gills its those little pocket like things under the umbrella
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