<span>The four goals of psychology are: describe observed phenomena, explain them, predict what may occur as a result of them and control behaviour as a result. Julie’s psychologist has helped Julie control her behaviour - her fear response to spiders - so they have met the ‘control behaviour’ goal of psychology.</span>
A nuclear reaction will <u>not</u> be affected with the use of a catalyst.
The amount of heat needed to melt the block of lead is 
Explanation:
The amount of heat needed to melt a solid substance already at its melting point is given by the equation

where
m is the mass of the substance
is the specific latent heat of fusion
In this problem, we have a block of lead already at its melting point,
. Its mass is
m = 200 g = 0.2 kg
and its specific latent heat of fusion is

Therefore, the amount of heat needed for the block to completely melt is

Learn more about specific heat:
brainly.com/question/3032746
brainly.com/question/4759369
#LearnwithBrainly
The answer is a
the equation needs to be balanced. There are fewer oxygen atoms in the equation than hydrogen or a carbon