Name the elements present in the compound sodium chloride.
sodium and chlorine
an object moving through the atmosphere is slowed down by the force due to ______
air resistance
The force of attraction between all objects with mass is due to _____
gravity
(element/compound/mixture) Oxygen gas
element
(element/compound/mixture) air
mixture
at 20 degree Celsius, most metals are . . . . . but non-metals will be found in all three . . . .
solid; states
Give three physical properties of non-metals
Poor conductors of electricity and heat. Non-Ductile metals. Brittle solids. Maybe solids, liquids or gases at room temperature. These are not sonorous. Transpa
Two solid objects rubbing against each other experience the force of _____
friction
(before/after/reflected/stopped) an echo is caused when a sound is ____. The echo reaches the listener _____ the original sound.
reflected; after
we can pull or push an object. when we do this, we are making a ____ act on the object. A force from one object can act on another object even if the objects are not ____. For example the Sun pulls on the Earth across empty space because _
force; touching; gravity
Give three physical properties of metals.
high melting points. good conductors of electricity. good conductors of heat. high density. malleable. ductile.
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