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robert7248
robert7248
09.03.2021 • 
Chemistry

What is a convection current? Which form of electromagnetic radiation from the sun is responsible for most of the radiant heat reaching the Earth?

List three things that can happen to radiant heat when it arrives at any surface.

Identify the features of a vacuum flask that reduce heat transfer by:(a)conduction (b)convection (c)radiation.

Explain, with the aid of a diagram, how a coastal sea breeze results from convection currents.

Think Suggest why metal saucepans usually have plastic or wooden handles.

Use the particle model of matter to explain why heat can’t travel through metals and other solids by convection.

Why is air a poor conductor of heat?

When you heat water in a saucepan on a gas or electric hotplate, all of the water gets hot and not just the lower part near the heat source. How does this happen, given that water is a poor conductor of heat?

Why do many sportspeople wear white clothing when competing on hot summer days?

To which form of heat transfer do the following statements apply?

(a)Energy is transferred at the speed of light.

(b)Particles move from one place to another.

(c)No particles are required for energy transfer.

(d)This form of heat transfer is best explained by a wave model.

Advertisements in the media often describe all products designed to reduce heat transfer to keep homes warm in winter or cool in summer as insulators.

Explain why it is incorrect to describe reflective metal foil as insulation.

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