When you grind wheat to make flour, the flour comes out very warm—you can actually scorch the flour if you grind too quickly. Explain how this temperature rise comes about.

Q: Indigenous peoples sometimes cooked in watertight baskets by placing enough hot rocks into the water…

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Q: Living creatures generally have a higher temperature than their environment. Explain why this makes…

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Q: The surrounding become pleasantly warm when water in a lake starts freezing in cold…

A: Molecules have more kinetic energy in liquid state than in solid form. In solid form, particles…

Q: What are the two types of flames produced if you manipulate the air holes in a bunsen burner?

A: The Bunsen burner produces two types of flames depending on whether the air hole is open and the…

Q: Fruit blossoms are permanently damaged when the temperature drops below about -4 °C, a “hard…

A: We have been given that  Fruit blossoms are permanently damaged when the temperature drops below…

Q: An automobile fuel tank is filled to the brim with 45.0 L of gasoline at 10.0oC. Afterward, the car…

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Q: Some gun fanciers make their own bullets, which involves melting and casting the lead slugs. how…

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Q: What protects the body from things like hot stove

A: Due to temperature gradient.

Q: Comparing ice water and ice candy, which one is colder? Explain.

A: Ice water is in the liquid phase whereas ice candy is in the solid phase.

Q: The boiling temperature of water decreases by about 3°C for each 1000-m rise in altitude. What is…

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Q: Q20:- When the temperature of a solid is one tenth of its Debye temperature, the phonon contribution…

A: According to Debye theory of specific heat capacity, heat capacity of the substance at low…

Q: If cooling occurred at the bottom of a pond instead of at the surface, would the pond freeze from…

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Q: freezing

A: Water has a very high heat capacity and act as a thermal buffer so it prevent food from freezing.

Q: When our bodies get too warm, they respond by sweating and increasing blood circulation to the…

A: Sweating  helps to maintain human body temperature. Evaporation will not takes place inside the…

Q: When night is falling and frost is predicted in citrus orchards, the owners sometimes burn “smudge…

A: The smoke produced by burning have higher velocity and temperature as compared to natural air due to…

Q: Two metal rods, one lead and one brass, are each clamped at one end (Fig. 6). At 0.0°C, the rods are…

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Q: A 68-kg man whose average body temperature is 39°C drinks 1 L of cold water at 3°C in an effort to…

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Q: Suppose a 2Kg of glycerine have a temperature of 30°C.Heat is supplied to a steady rate of 100 W.…

A: Mass, m = 2 kg Initial temperature, Ti = 30°C Final temperature, Tf  = 75°C Power, P = 100 W Time, t…

Q: A dietician develops a new diet, in which people drink copious amounts of ice water. The theory is…

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Q: It is difficult to cook vegetables on hills and mountains. Explain the reason.

A: In higher altitudes, the atmospheric pressure will be low when compared to the sea level. As a…

Q: Wood is better insulator than glass , yet fiberglass is commonly used as insulator in wooden…

A: Wood is better insulator than glass. Because glass is highly viscous liquid contain some but…

Q: Explain why a firewalker can step quickly without harm on red-hot coals with bare feet.

A: A firewalker can step quickly on red-hot coals with bare feet as wood is a very good insulator.

Q: When you (m=84.1 kg) walk for 67.1 min, you burn 458.74 food Calories.  When you ingest something…

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Q: The specific heat of a substance varies with temperature according to c = 0.24 +0.47T+0.049T2, with…

A: Variation of specific heat with temperature : c = 0.24 + 0.47T + 0.049T2 mass (m) = 7.9 g Initial…

Q: Putting a lid on a boiling pot greatly reduces the heat transfer necessary to keep it boiling.…

A: The partial pressure of water vapor below and above the lid is equal to the atmospheric pressure The…

Q: To sterilize a 49-g glass baby bottle, we must raise its temperature from 22.0°C to 95.0°C. - How…

A: Given data:  Mass (m) = 49 g = 0.049 kg Initial temperature (T0) = 22.0°C Final temperature (T) =…

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

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Q: How long will it take to cool the lemon squash

A: Given data;  Mass,m=0.5 kg Specific heat capacity,c=4200 J kg-1K-1Lemon squash,t1=300CLemon at cool,…

Q: Which has more molecules with higher average kinetic energy, Chesapeake Bay or Hot Cocoa? and which…

A: given that  temp of  Chesapeake Bay  = 5°C                                     Hot Cocoa = 85 °C…

Q: A piece of square copper sheet with a hole in the middle was heated. Due to thermal expansion, will…

A: When copper plate is heated then in that case due to thermal expansion of metal the hole in copper…

Q: What is the difference between the calorie used in physics and Calorie used in nutrition?

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Q: Explain why an egg cooks more slowly in boiling water in Denver than in New York City.

A: New York City is lies along the ocean level while Denver city is about 1 mile from ocean level.…

Q: In terms of heat flow, explain why you feel cool after alcohol is rubbed on your skin.

A: The alcohol is a very volatile. That means it evaporates quickly.…

Q: A 0.200 kg piece of aluminum that has a temperature of -155°C is added to 1.5kg of water that has a…

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Q: given 1,000,000 J of ebergy, what is the maximum amount of gold you can melt? The latent heat of…

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Q: A typical woman gives off heat at the rate of about 8,000 calories per hour. How long would a woman…

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Q: Oxygen cannot be liquefied at room temperature by placing it under a large enough pressure to force…

A: For oxygen critical temperature is -118 degrees Celsius. Room temperature will generally around +23…

Q: A chemistry teacher claims that the heat content of a particular substance is 246 kJ/mol. Is the…

A: The chemistry teacher is not claiming that the substance contains heat. The teacher is trying to say…

Q: Suppose a 60-kg person consumes 2,500 Cal of food in one day. If the entire heat equivalent of this…

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Q: Indigenous people sometimes cook in watertight baskets by placing hot rocks into water to bring it…

A: Given data: The initial temperature of rock, Tri=500 °C. The mass of water, mw=4 kg. The initial…

Q: Suppose it's winter and the machine is powered with methanol. Methanol has a density of 0.80 g/cm3.…

A: Given data, Density of Methanol, d = 0.80 g/cm3 = 0.80×1000 kg/m3 = 800 kg/ m3  Amount of heat…

Ideal Gas Law

Ideal gas law states that the product of pressure and volume of a gas directly varies with the product of the number of moles, the universal gas constant, and the temperature of the gas.