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a colorless solution

a true solution

a closed system

an open system

solution of electrolyte

an isolated system

a homogenous mixture

a chemically pure substance

the same amount of the substance is dissolved in the time unit as it is against precipitated from the solution

its composition is the same under the defined conditions

the osmotic pressure

the maximum amount of the salt is dissolved under the defined conditions

there is the dynamic balance between the undissolved part of the substance and the solution

the equilibrium state

a) in its chemical composition


b) in the content of anions


c) in the content of cations


d) in the fact that the distilled water is the strong electrolyte and drinking water is the weak electrolyte


e) in the fact that the drinking water is a chemical individual and distilled water is not a chemical individual
f) it does not differ

4. Electrons:
a) of the same atoms are involved in the formation of a nonpolar covalent bond (for example in N2 molecule)

) with the lowest energy are referred to as electrons in the ground state
c) 

occupy individual energy levels in the atom by filling the highest energy level first
d) 

can be removed from the atom forming anions
e

) belong to the elementary particles with a negative charge
f) 

their number in the atom is always equal to the number of neutrons
g

) in atoms are in the regions called orbitals
h

proton


b) an electron
c

) an atom


d) a nucleon
e

) a matter
f

) a compound


solution of NaCl in distilled water



b) only a compound

c) Al2O3


d) an electron
e

) drinking water
f

) sea water
g

) an element or a compound

are isotopes


b) have the same number of protons
c) 

have the same number of neutrons
d) 

have a different number of nucleons
e) 

have a different number of electrons
f) 

have a different number of neutrons
g) 


h) have the same atomic number

comenius

chemistry 1-100

chemistry 1-100

Author

aria I.

Information