Answer:
4.The elements are organized by their properties.
Explanation:
Answer:
Al(OH)₃ + 3 HCl ----> AlCl₃ + <u>3 H₂O</u>
Explanation:
In a double-displacement reaction, the cation of one compound is swapped with the cation of another. The basic structure of these reactions is:
AB + CD ----> AD + CB
In this reaction, the aluminum (Al) of Al(OH₃) is replaced by the hydrogen (H) of HCl, and vice versa.
The first resulting compound is AlCl₃. The chlorine has a subscript of 3 in order to eliminate the +3 charge from the Al cation (+3 + 3(-1) = 0). The second resulting compound is HOH, most commonly written as H₂O. There needs to be a coefficient of 3 in front of H₂O to balance the equation.
The complete balanced equation is:
Al(OH)₃ + 3 HCl ----> AlCl₃ + <u>3 H₂O</u>
The equation that relates the work, heat and internal energy is given below.
ΔU = Q - W
where ΔU is the change in internal energy, Q is the heat (positive when added to the system and negative when removed from the system), W is work (- when done by the system and + when done on the system)
Substituting the known values,
ΔU = (5.00 x 10^2 kJ) x (1 kcal/4.18 kJ) - 325 kcal
ΔU = -205.38 kcal
Answer: This is true.
Explanation:
It is true because if becomes frozen, then it is physically harder to melt...
What is true in a saturated solution is that it cannot dissolve any more solute.
A saturated solution is a chemical solution that contains the highest concentration (maximum capacity) of a solute dissolved in the solvent. When additional solute is added to a saturated solution, it will not dissolve it but it may result in a solid precipitate or left as a gas. The saturation of a solution depends on various factors such as temperatures, pressure, and the chemical makeup of substances involved. Examples of saturated solutions include; carbonated water and mixture of sugar and vinegar.