Answer:
The correct answer is D: the reactants are generally two ionic compounds in aqueous solution.
Explanation:
A type of reaction in which two reactants participate and exchange ions with each other as the reaction proceeds. Such type of reaction is known as a double displacement reaction. In double displacement reaction, the product formed is precipitate.
Below is the pathway of the double displacement reaction:
AB + CD → AD + CB
In double displacement reaction usually, ionic compounds are involved. The bond formation between the reacting species may be ionic or covalent in nature.
Hey there.
By adding up all the "exponents," you'll get a number of 19. By looking at a periodic table, the element of such an atomic number is potassium or K.
Answer: Only A
Explanation: The moon controls the tides because of its gravitational pull. The moon's gravitational pull is weaker than Earths that is why the moon's gravitational pull only effectts water on the earth.
Answer:
78.8°C
Explanation:
Given parameters:
Amount of heat energy = 130kCal
Mass of the cheese = 2.5kg
Initial temperature = 27°C
Unknown:
Final temperature = ?
Solution:
To solve this problem, use the expression below;
H = m C (T₂ - T₁)
H is the amount of heat
m is the mass
C is the specific heat capacity of water = 4200J/kg°C
Now,
convert the amount of heat to kJ;
1kCal = 4.18KJ
130kCal = 130 x 4.18 = 543.4kJ
Insert the parameters and solve;
543.4 x 10³ = 2.5 x 4200 x (T₂ - 27 )
543.4 x 10³ = 10500 x (T₂ - 27 )
(T₂ - 27 ) = 51.75
T₂ = 51.75 + 27 = 78.8°C