Explanation:
It is possible to predict a physical change or chemical change because they have very unique properties and differences.
A physical change is a change that alters the physical properties of matter especially form and state.
A chemical change is a change in which new kinds of matter is formed.
Here are some of the properties and indicators of the these change;
- A physical change is easily reversible
- Chemical changes are not easily reversible
- Physical changes leads to the production of no new kind of matter.
- Chemical change produces new kinds of matter
- Physical change involves no change in mass
- Chemical change involves a change in mass
- Physical change requires little to no amount of energy
- Chemical change requires considerable amount of energy.
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Answer:
17.6kJ
Explanation:
The mass of ethanol given is 161.g
Now we first find the number of moles from this.
Number of moles = 
Molar mass of C₂H₅OH = 2(12) + 5(1) + 16 + 1 = 46g/mol
Number of moles of ethanol = 
= 3.5mol
Since the heat of fusion is 5.02kJ/mol;
Heat of fusion is a measure of the amount of energy needed to melt a substance.
Amount of energy needed to melt = 3.5mol x 5.02kJ/mol
= 17.6kJ
Answer is: D. sodium and sulfur.
When the electronegativity difference is greater, the bond polarity is increasing..
Electronegativity (χ) is a property that describes the tendency of an atom to attract a shared pair of electrons.
Atoms with higher electronegativity attracts more electrons towards it, electrons are closer to that atom.
Δχ(Na-S) = 2.6 - 0.95 = 1.655; electronegativity difference between sodium and sulfur.
Ionic bond is the electrostatic attraction between oppositely charged ions (cations and anions).
Sodium is metal (forms cation) and sulfur is nonmetal (forms anion).
Answer:
Nonpolar Solvent. Carbon tetrachloride. CCl4
Explanation:
The other compounds listed are polar;
polar substances are by their nature more soluble in Other polar compounds. NH3 is a gas; so unless it was a very specific compound you needed in ammonia gas, it, being also polar as well as a gas would not be a good choice for this question.
