Practice PMS questions with answers and explanations.
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Distillation boils water and then condenses the vapor.
Nonvolatile salts remain in the original container.
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Atoms are the basic chemical units of elements.
They contain protons, neutrons, and electrons.
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Protons carry positive electric charge.
They are located in the atomic nucleus.
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Electrons carry negative charge.
They occupy regions around the nucleus.
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Neutrons are electrically neutral.
They are found in atomic nuclei with protons.
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The proton number is the atomic number.
Changing the proton number creates a different element.
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O is the chemical symbol for oxygen.
Element symbols use one or two letters.
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Iron's symbol Fe comes from the Latin word ferrum.
It is a common structural metal.
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Sodium's symbol Na comes from the Latin natrium.
It is a highly reactive alkali metal.
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Each water molecule has two hydrogen atoms and one oxygen atom.
Its formula is H₂O.
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Carbon dioxide contains one carbon atom and two oxygen atoms.
Its formula is CO₂.
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Soft porous materials absorb part of the sound energy.
This reduces excessive reverberation and improves clarity.
