None of the above the answer would be D
Answer:
B) it is endothermic and the temperature decreased
Explanation:
Chemical reactions can be classified as endothermic and exothermic.
Endothermic reactions proceed with the absorption of heat energy (q) and have a positive value for q.
In contrast, Exothermic reactions proceed with the liberation of heat energy (q) and have a negative value for q.
It is given that the value of q = +450 J. Since q is positive, this implies that heat energy is absorbed from the surroundings resulting in a fall in temperature. Hence the reaction is endothermic.
If you mix all of the primary colors, you get White light
Answer: d = 7.9 g/cm^3
Identify the given information.
m = 79 g
v = 10 cm^3
Choose which formula you should use. In this case, you are finding the density.
d = m/v
Substitute and solve.
d = 79 g/10 cm^3
d = 7.9 g/cm^3
The answer is (in
order from strongest to weakest);
<span>covalent </span>
<span>ionic </span>
ion-dipole
H-bonding
dipole-dipole
<span>van der Waals</span>
A covalent<span> bond is
hardest to break because it involves sharing of electrons by atoms while Van der
Waals is weakest because they involve electrostatic
attraction due to differentially induced
dipoles between atoms and its strength is dependent
on their distance apart. </span>
