Why does decreasing the temperature of a liquid make it freeze?

Q: what is meant by optimal temperature ?

A: Optimum temperature: The temperature at which an enzyme shows its highest activity is called optimum…

Q: Cite three ways in which a Thermos bottle inhibits heat transfer.

A: Construction of thermos is as shown in the figure. Coffee is stored in an internal container as…

Q: 2.61 At a temperature of 60°F, what pressure must be imposed in order for water to boil.

A:

Q: The heating effect depends on which factors?

A: The heating effect of current depends on the following factors : The amount of time for which the…

Q: When putting ice in a glass of water, is it the ice that cools the water or the water that warms the…

A: Since heat transfer from higher temperature to lower temperature. Water has more temperature then…

Q: When a superheated liquid is agitated, which of the following may occur? *

A: When a superheated liquid is agitated then bubble formation occurs.

Q: Why does water vapor in the air condense when the air is chilled?

A: In the condensation process, a substance changes its phase from gas to liquid.   The kinetic energy…

Q: Why does the temperature of boiling water remain the same as long as the heating and boiling…

A: The temperature of the boiling water will not exceed 100°C as long the heating and the boiling…

Q: The formation of ice from water is accompanied by whichof the following: (a) an absorption of heat…

A: Water can exist in solid, liquid, and in gas (vapor).

Q: What is meant by temperature

A: Temperature is the quantity that is also defined as the degree of hotness or coldness of the body.…

Q: Why is the ice is less dense than liquid water so unusual?

A:

Q: How can water be brought to a boil without heating it?

A: Boiling is the process when liquid phase changes to the gas phase.

Q: In lab you submerge 100 grams of 40 C nails in 100 grams of 20 C water. Equate the heat gained by…

A: Heat lost by the iron nail is equal to the heat gained by the water.

Q: Why is very cold ice 'sticky'?

A: An extremely thin layer of liquid water exists on the surface as the heat from the hand melts the…

Q: Is it the boiling of water or the higher temperature of water that cooks food faster in a pressure…

A: Food can be cooked more quickly in a pressure cooker.

Q: Why do we feel hot after a long period of running or doing exercise?

A: When we do running or any exercise, it will lead to increase in the muscular activity.

Q: What is the reason for ice being less dense than water?

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Q: If you boil water in a whistling kettle, the kettle whistle when the water reached  its boiling…

A: In this problem it is asking about why does kettle whistle when the water reached its boiling point.

Q: Many tongues have been injured by licking a piece of metal on a very cold day. Why would no harm…

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Q: 4. 300g of water at 50°C in a 100g glass are added to 20g of ice at 0°C. Solve for the final…

A: Given: Mass of water = 300 grams  Initial temperature of the water = 50o C Mass of ice = 20 g…

Q: Suppose the hot cocoa loses 100J of energy by heating. How much energy does the air gain?

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Q: Boiling is a form of evaporation - O True O False

A:

Q: Which is more painful, burn caused by condensing steam or burn caused by boiling water at the same…

A: Given:- Which is more painful, burn caused by condensing steam or burn caused by boiling water at…

Q: If 10 grams of 20 degree water is mixed with 10 grams of 40 degree water, what would the final…

A: If (m1)10 grams water of (T1) 20 degree centigrade teperature mixed with (m2) 10 grams water of (T2)…

Q: Why doesn't energy added to boiling water increase the temperature of the water?

A: When the water is boiling, it is on the course of undergoing a phase transition from its liquid…

Q: Ca;culate the engergy required to raise the temperature of 2.8 kg of water from 20 degrees C to 100…

A: 2.8 kg of water from 20 degrees C to 100 degrees

Q: At what common temperature will a block of wood and a block of metal feel neither hot nor cold to…

A: The heat tranter will occur only when the temperature of the object and the surroundings are…

Q: Why is steam burn more damaging than a burn from boiling water of the same temperature?

A: Latent heat of vaporization:Without changing the temperature of the liquid, the amount of energy…

Q: Which requires more heat: 1 g ice at 0° C or 1 g water

A: Given; 1g of ice at 00C or 1 g water at 00CWhich requires more heat to raise its temperature to…

Q: Substances that don’t conduct heat are known as what?

A: The value of coefficient of thermal conductivity (K) of a material is equal to the rate of flow of…

Q: Heat flows from one body to another when they have O a. different heat contents. O b. different…

A:

Q: Explain the saying “It’s not the heat; it’s the humidity.”

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Q: State whether water at the following temperatures will expand or contract when warmed a little: 0°C;…

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Q: How does the temperature of water change when it is placed in a freezer and then begins to freeze?

A: Refrigeration is a process where any object placed inside a refrigerator cools down while we provide…

Q: When water freezes what happens to its molecules?

A: This question is based on thermal properties of matter topic. At high temperature, the molecules of…

Q: Why does the boiling temperature of water decrease when the water is reduced under pressure, such as…

A: A substance starts boiling when the vapor pressure of the substance overcomes the ambient pressure.

Q: What properties would a material need in order to be a better coolant than ice?

A: A coolant has the property to absorb more heat with minimum change in temperature. Ice has specific…

Q: Why does all the water in a lake have to be cooled to 4°C before surface water can be cooled below…

A: A lake starts to cool from some temperature above 4 degree Celsius. The surface water on reaching…

Q: How much will the temperature of the water change when it is boiling?

A: Once the temperature is reached to the boiling point of water, no further increase in temperature is…

Q: 50 g of ice at 0oC is added to 200 g of water at 40oC contained in a 100 g copper calorimeter. If…

A: Given: Ice mass, mi=50 g at T=0° C Water mass, mw=200 g at Ti=40° C Copper calorimeter mass, mc=100…

Q: How much heat is necessary in kcal to change 15-lb of ice at -30 degrees C to water at 60 degrees C.…

A: Given data- mass of ice m=15 lb 1 lb=0.454 kg so m=15 × 0.454 kg=6.81 kg Lf=80 Kcal/Kg Lv=540…

Q: Water in lakes and ponds do not freeze at once in cold countries. Give reason.

A: Latent heat of fusion of ice is 336J/g, which is sufficiently high.

Q: why doesn't the temperature of a beaker of water change during melting or boiling?

A: