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LuckyWell [14K]
3 years ago
15

What type of change occurs when water changes from a solid to a liquid? A. a phase change B. a physical change C. an irreversibl

e change D. both a and b
Chemistry
1 answer:
mars1129 [50]3 years ago
3 0
B, a physical change because it is not destroying the substance.
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Answer:

B 24 m west I belive that it is the answer

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3 years ago
A sample of CH4 is confined in a water manometer. The temperature of the system is 30.0 °C and the atmospheric pressure is 98.70
kakasveta [241]

Explanation:

The given data is as follows.

  P_{atm} = 98.70 kPa = 98700 Pa,  

      T = 30^{o}C = (30 + 273) K = 303 K

      height (h) = 30 mm = 0.03 m (as 1 m = 100 mm)

Density = 13.534 g/mL = 13.534 g/mL \times \frac{10^{6}cm^{3}}{1 m^{3}} \times \frac{1 kg}{1000 g}

                = 13534 kg/m^{3}

The relation between pressure and atmospheric pressure is as follows.

             P = P_{atm} + \rho gh

Putting the given values into the above formula as follows.

            P = P_{atm} + \rho gh

               = 98700 Pa + 13534 \times 9.81 \times 0.03 m

               = 102683.05 Pa

               = 102.68 kPa

thus, we can conclude that the pressure of the given methane gas is 102.68 kPa.

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3 years ago
Rank these compounds by highest boiling point to lowest boiling point? Pentane, neopentane, isopentane
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<span>Pentane has a boiling point of 36.1 C, while isopentane boils at 27.7C. Neopentane has the lowest boiling point at 9.5 C. Therefore from highest to lowest boiling points, it is pentane, isopentane, and neopentane.</span>
4 0
4 years ago
why do all of these elements- hydrogen, helium, lithium, and beryllium all have negative charges? explain
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3 years ago
Describe the scale used to measure the basicity of a substance. Demonstrate how you could differentiate a weak base from a stron
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pH value of 7 is weak base and value of 14 means strong base.

8 0
3 years ago
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