Dry table salt is an insulator whereas molten salt is a  conductor. Why?

Q: Even though metal is a good conductor, frost can be seen on parked cars in the early morning even…

A: The radiation from the Sun will be absent early in the morning. Therefore, the surrounding…

Q: Explain two ways that insulators exert their effects.

A: Insulators

Q: Choose the BEST answer to the following: Thermal conduction mainly involves (a) electrons. (b)…

A: Step 1Metals such as steel, copper and aluminum are excellent thermal conductors.

Q: Chinawares are wrapped in straw or paper before packing. Why?

A: Chinaware are wrapped in straw or paper before packing, as when it falls on ground, the force of…

Q: cool

A: Aluminium has higher specific heat capacity which means you require more heat energy to heat up a…

Q: When wax is coated on clothes , they become water proof. Why?

A: When there is no wax, adhesive force between cloth and water molecules is stronger than the cohesive…

Q: 6. The only metal that is a liquid at room temperature is O Copper O Silver O Mercury O Sodium

A:

Q: Why does the ability of a metal to conduct electricity decrease with increasing temperature?

A: SOlution: how does the ability of a metal to conduct electricity affect with increasing temperature.

Q: Particles of camphor move around on the surface of water. Why?

A: The surface tension of water decreases when the impurities are dissolved in it. The camphor is…

Q: Consider the dissolution of CaCI2: CaCl2(s) Ca (aq) + 2CI (aq) AH = -81.5 kJ/mol A 15.0-g sample of…

A: Given compound is --> CaCl2  Amount of substance = 135 grams Amount of compound = 15 grams Atomic…

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 conductivity of metals decrease with increase in temperature?

A: Decrease in conductivity of metal with the increase in temperature: In metals, there are free…

Q: involves no contact and uses only insulators. O friction O gavity O poplarization O-uduction

A: Induction charging is used to charge an object without touching the object to any other charged…

Q: Two safety pins, identical except that one is latched and one is unlatched, are placed in identical…

A:

Q: Why do some animals curl up into a ball when they are cold?

A: By Stefan's law of energy radiation, rate of radiation of energy is directly proportional to surface…

Q: Why does a wire not simply cut a block of ice in two when it passes through the ice?

A: As the wire passes through the ice block, there is a pressure induced beneath the wire which melts…

Q: When a pressure of 2.0 MPa is applied to a sample of kerosene, it contracts by 0.15%. The value of…

A: Given: Applied pressure, P=2.0 Mpa=2×106 Pa Volume contraction, ∆VV=0.15%=0.15100

Q: The melting point of titanium is 1668°C which is equivalent to .. Kelvin. 1394.85 K 1941.15 K 1668 K…

A:

Q: Why do metals feel cold even when they are at room temperature?

A: Metals feel cold

Q: 4 Conductivity of Select Materials Conductivity Material (1/(2 m)) Aluminum 3.77 x 107 Copper 5.95 x…

A: If conductivity of  material will be large then it's resistance will be low and therefore energy…

Q: QlITheproduet of the two influences Choose the answe 4. HBTAt 2/8^ A^

A: It is a property of quantum mechanics.

Q: Can a diamond conduct electricity?

A:

Q: When you rub a piece of ebonite (very hard, black rubber) across a piece of animal fur which…

A: On rubbing a piece of material with another we are doing charging by method of friction.  In method…

Q: Tents are coated with thin layer of aluminium hydroxide. Why?

A: Tents are coated with a thin layer of aluminium hydroxide because aluminium hydroxide is insoluble…

Q: How much heat (in kJ) must be added to completely transform the ice (at the melting point) to liquid…

A: Given Mass of ice = 2.0 kg Initial temperature of ice = -8 °C Final temperature of water = 0 °C We…

Q: Why are throttling devices commonly used in refrigeration and air-conditioning applications?

A:

Q: Why does increasing the temperature of a solid make it melt?

A: The process by which solid become liquid is known as melting. Phase changes occur when matter…

Q: What physical phenomenon predominantly contributes to the magentic field of the earth

A:

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: why is lightning categorized as plasma? A. It consists of tightly packed particles  B. it has a…

A: Given : why is lightning categorized as plasma? A. It consists of tightly packed particles  B. it…

Q: Dry table salt is an insulator but molten salt is a conductor. Explain?

A: In dry table salt negative and positive ions are bound to each other and cannot move freely when…

Q: Why do some animals curl up into a ball when they are feeling cold?

A: The total energy radiated by a body depends on its surface area . Thus when the animal feel very…

Q: Why is aluminium used in the distribution and transmission of electricity but not copper

A: Given: Why is aluminium used in the distribution and transmission of electricity but not copper

Q: Describe how an insulator can acquire a change?

A: Insulator materials are type of materials which have no charge.  But there are certain conditions in…

Q: 2Ω 4Ω www Ε 6Ω 4Ω. ,5Ω Α Β

A: Here, 2Ω resistor and the 4Ω resistor between the points C and E are in series. So, their equivalent…

Q: Pure water is an insulator but salty water is a conductor. Explain?

A: It is true that pure water is an insulator and salt water is a conductor.

Q: Is iced water a pure substance? Why?

A:

Q: Why is the energy is required to melt a solid?

A: Particles in solid are connected to each other by strong bonds and cannot move freely as in liquid…

Q: Soldering becomes easy due to the addition of flux. Why?

A: Step 1A flux is a chemical cleaning agent which have function is metallurgy and metal joining. Some…

Q: Ice is packed in saw dust, Why?

A: Saw dust is a very bad conductor of heat. So, if ice is kept in saw dust, ice will not melt easily.

Q: Oil rises in lamp wick, Why?

A: The oil in the wick of an oil lamp rises up due to capillary action. This effect is due to surface…

Q: Pure water is an insulator whereas salty water is a conductor. Why?

A: It is a true statement that pure water is an insulator whereas the salty water is a conductor.