The enthalpy change for an exothermic reaction is negative because heat is being released, so that takes out two of the responses. Since energy is being released into the surroundings due to the exothermic reaction, the potential energy of the products is lower than that of the reactants. Energy is being put in to make the reaction occur, but then that energy is all being released into the surroundings thus a lower potential energy level for the products
Answer:
20.3 % NaCl
Explanation:
Given data:
Mass of solute = 45.09 g
Mass of solvent = 174.9 g
Mass percent of solution = ?
Solution:
Mass of solution = 45.09 g + 174.9 g
Mass of solution = 220 g
The solute in 220 g is 45.09 g
220 g = 2.22 × 45.09
In 100 g solution amount of solute:
45.09 g/2.22 = 20.3 g
Thus m/m% = 20.3 % NaCl
Answer:
Dissociation
Explanation:
The molecule of water is polar. This means that the hydrogen has a partial positive charge while the oxygen has a partial negative charge.
Ionic compounds have equal number of positive and negative charges.
When these compounds are placed in water, the partial positive hydrogen starts to attract the negative ion of the ionic compound while the partial negative oxygen starts to attract the positive ion of the ionic compound.
This process is called dissociation and leads to the breaking of ionic compound into cations and anions in water.
Hope this helps :)
Answer:
D. It is extremely reactive.
Explanation:
Potassium has atomic number of 19 and belongs to the group 1 elements.
A. It is dull and brittle
This is not true as potassium is a metal with a silver lustre.
B. It is not reactive
This is false. Because it is a group 1 element, it would readily lose it's electron to achieve octet configuration making it a reactive metal.
C. It is white and hard.
Potassium is a white metal, however it is not hard. Rather it is soft.
D. It is extremely reactive.
This is correct. Because it is a group 1 element, it would readily lose it's electron to achieve octet configuration making it a reactive metal.
