Answer:
The correct answer is:Oxygen is more electronegative than carbon. See the explanation below, please
Explanation:
The electronegativities of oxygen and carbon are: 3, 44 and 2, 55 respectively. The electronegativity is defined as the capacity that a given atom has for the attraction of electrons, by forming a chemical bond. Polarity is related to electronegativity. The greater the difference in electronegativities between two atoms, the polarity of the bond they form will be greater.
Answer:
To convert from mols to grams, multiply the number by the total molar mass of the compound.
To find the approximate molar mass of a compound, add up the molar masses of each element in the compound, making sure to multiply by the subscripts.
<u>#2 for example:</u>
First, find the molar mass of NaCl.
Molar mass of Na= 22.990g (refer to a periodic table or look it up)
Molar mass of Cl= 35.45g
22.990g + 35.45g= 58.44g
Next, convert from mols to g.
2.19 mol x 58.44g= 127.98g NaCl
To convert from grams to mols, do the same thing as mols to grams except DIVIDE instead of multiply.
<u>#3 for example:</u>
NaC2H3O2
Na= 22.99g
C2= 12.011 x 2 => 24.022g (multiply molar mass of C by 2 since there are 2 carbons)
Do this for the rest of the elements in the compound and add them up. The total molar mass should be approximately 82.0343g.
Next, convert from g to mol.
14.68g/82.0343g≈ 0.179 mol
The chemical properties of the substance are those that describe the changes it undergoes to form a new substance. On the other hand, the physical changes are those that describe the changing only the phases and other physical properties. From the choices, the answer is number "4. sugar burns in air to form water and carbon dioxide".