Na- 11=22
H-1 =1
C-12=12
O3=16*3 =48
total = 22+1+12+48 = 83
83-----> 48
100-----> 100*48/83=57.83 = 57.13 is nearest answer
The measurement 0.020 km has two significant figures, which are '2' and '0' after '2'.
The number of significant figures in a number refers to the digits that carry meaning and contribute to the accuracy of the measurement. In the given measurement of 0.020 kilometers, there are two significant figures. These are the digits '2' and '0' located immediately after the '2'.
The zeros before these numbers, such as in '0.020 km', are not significant figures because they simply indicate the position of the decimal point, and they do not contribute to the precision of the measurement.
#SPJ6
Extensive
Chemical
Biological
(2) CO2 and CH4 (4) H2O and CH4
Answer is: 3) H2O and HCl.
Polar molecules are water (H₂O) and hydrochloric acid (HCl).
Nonpolar molecules are carbon(IV) oxide (CO₂) and methane (CH₄).
Carbon(IV) oxide is nonpolar because CO₂ is linear molecule and the oxygen atoms are symmetrical (bond angles 180°).
Water is polar because of the bent shape of the molecule.
Hydrochloric acid has polar covalent chemical bond where hydrogen has oxidation umber +1 and chlorine oxidation number -1.
In molecule of methane (CH₄) all the atoms around the central element (carbon) are equivalent (four hydrogens) and it has a net dipole moment of 0 (vectors of dipole moments cancel each other, dipole moment is zero).
b. suspensions
c. colloids
d. solutions
The answer is A) heterogeneous mixtures, look up how a heterogeneous mixture is separated and it will tell you distillation. Have a nice day and good luck on the rest of your work