Science at Home

Basic chemistry
Questionarium
 

 

    1. All the substances that surround us are formed by:
 
atoms, molecules and ions   molecules   atoms and molecules

 

    2. In the following elements He, Na, Cl, Br, Ar, Xe, we have:
 

two noble gases  four noble gases   three noble gases

 

    3. The elements Li, Na, K, Rb, Cs e Fr are designated by:
 

alkaline earth metals   halogens   alkaline metals

 

    4. An intensive property is:
 

dependent of the amount of matter
independent of the amount of matter
none of the previous answers

 

    5. In an oxidation-reduction reaction when an atom loses an electron it is:
 

reduced   oxidized  none of the previous answers

 

    6. The atomic number of an element is:
 

the number of electrons of that element
the protons and electrons sum of that element
the number of protons of the atom of that element

 

    7. The diamond is:
 

a compound   a mixture   an element

 

    8. Steel is:
 

a mixture   a compound   an element

 
Time:



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