QUESTIONS AND
ANSWERS.GRADED A+
Which of these reduces friction - ball bearings
When a lobster grows a claw to replace one that was lost, the process is called -
regeneration
Any astronomical body that revolves around a larger body is called - satellite
In chemistry, to be classified as an organic substance, a substance must contain? -
carbon atoms
Which element does NOT contain any neutrons - Hydrogen
The chemical formula of a compound describes the elements the compound contains
and the - the ratio of elements in a compound
What is the symbol for the hydroxyl ion - OH-
The Tympanic membranes are also known as the - Ear drum
Which of the following actions produce a chemical change - adding salt to the hot water
Choking is prevented by the - Epiglottis
A perpetual-motion machine can never be built because it is not possible to eliminate -
elasticity
Which of the following is a renewable source-?
When scientist measures a liquid's resistance to flow, they are measuring the liquids -
Viscosity
Regeneration in man is limited to - Healing of wounds