Science Flashcards
Which of these is the best explanation of how a smooth round stone became smooth
It was in a stream for a long time
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
A 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
ratio of elements in the compound.
What is the symbol for the hydroxyl ion?
OH-
Tympanic membranes are also known as the
ear drums.
Which of the following actions produce a chemical change?
Adding salt to the hot water
Choking is prevented by the
epiglottis covering the voice box.
What do a hydrogen molecule and an oxygen molecule have in common?
The charge on each electron
Which of the following is a non-renewable source?
Copper
What are the two main gases that make up the stars?
Hydrogen and helium
The term “meiosis” is usually associated with
reproduction.
Which of the following enables this pen to work?
Capillary action
