In a chemical reaction, water decomposes to form hydrogen and oxygen.

Which term names the water?

A. an element

B. an atom

C. a product

D. a reactant

Identify the energy transformation of a. toaster b. flashlight c. windmill d. light bulb e. sun f soylarcell

Which type of thermal energy transfer occurs mostly in fluids? insulation radiation convection conduction

The bones of the middle ear cause the to vibrate and change the sound into signals.

Explain 5 factors that act as a stimulant to change.

An electric kettle supplies 20,000J of energy to heat 0.5kg of water. What is the temperature change? The specific heat capacity of water is 4200J/kg°C.

Which statement is true about the atom? A: it contains positive electrons, uncharged protons and negative protons. B: it contains uncharged neutrons, positive electrons and negative protons.

Steel objects can become temporary magnets because they are mainly composed of which element?

How long does it takes the sun to rotate the earth?

Which explains how winds move?

Why is it important to develop alternative energy sources