Magnesium hydroxide is only very slightly soluble in water. The reaction by which it goes into solution is: Mg(OH) 2 (s) rightle
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Answer:
1.High pressure will cause the liquid to become solid :
<u>Describe both water and other substances</u>
2.High pressure will cause the solid to become liquid <u>:</u>
<u>It describe none : neither water nor other substances </u>
<u>This statement is :False for both water and other substances</u>
3.The solid is more dense than the liquid :
It describe other substance
<u>This statement is :False for water but true for other substances.</u>
4. In a phase diagram, the solid-liquid coexistence line has a negative slope.
It describes water:
<u>This statement is :True for water because solid ice is less dense than liquid water.</u>
<u>False for other substance, they have positive slope</u>
5.The molecules are closest in the liquid phase.
<u>This statement is :False for water and other substances </u>
6.The solid is less dense than the liquid:
It Describes water because ice is less dense than liquid water
7. In a phase diagram, the solid-liquid coexistence line has a positive slope.
It describe other substances
<u>This statement is :True for other substances but false for water</u>
8. The molecules are closest in the solid phase :
<u>Describes both water and other substances </u>
Explanation:
<u>Answers to statement 1 , 2,5 and 8</u>
<u>Answers to statement 1 , 2</u>
On increasing pressure and decreasing temperature , There occur<u> Phase transition</u> always for every substance :
From liquid to solid and gas to liquid
Hence,
In Both for water and other substance
<u>High pressure will cause the liquid to become solid.</u>
<u>Answers to statement 5,8 :</u>
2.The Particles of solid are closely packed hence there is maximum force of attraction between the particle of solid as compared to liquid and gases .
Hence , The molecules <u>of both water and other substance</u>s are closest in the solid phase
This also means that in liquid molecules are far apart .
Rest statement : 3, 4 ,6 ,7 are explained below(see attached image)
<u>The molecules are closest in the liquid phase is false statement and does not describe both water and other substance</u>
<u>Ice floats on water. For most other substances, however, the solid sinks in the liquid.</u>
This can be explained using the phase diagram of <u>water </u>:
The line DB is = the solid-liquid coexistence line
It has negative slope because , solid ice is less dense than liquid water . That is why ice floats on water because its density is less than water
Hence <u>Water is described truly by statement 4,6, </u>which are :
4. the solid-liquid coexistence line has a negative slope.
6.The solid is less dense than the liquid.
Rest 3,7 = describe by other substance
<u>other substance</u> : Solid is more dense than the liquid ,the solid-liquid coexistence line has a positive slope
Answer:
-5.51 kJ/mol
Explanation:
Step 1: Calculate the heat required to heat the water.
We use the following expression.
where,
- c: specific heat capacity
- m: mass
- ΔT: change in the temperature
The average density of water is 1 g/mL, so 75.0 mL ≅ 75.0 g.
Step 2: Calculate the heat released by the methane
According to the law of conservation of energy, the sum of the heat released by the combustion of methane (Qc) and the heat absorbed by the water (Qw) is zero
Qc + Qw = 0
Qc = -Qw = -22.0 kJ
Step 3: Calculate the molar heat of combustion of methane.
The molar mass of methane is 16.04 g/mol. We use this data to find the molar heat of combustion of methane, considering that 22.0 kJ are released by the combustion of 64.00 g of methane.