25 points.
i need with a science dba.
it's 8th grade module 1, and i basically just need a quick summary about it, and the answers to the following questions:
what is science?
what is non-science?
what is empirical evidence?
what makes a question able to be answered by science?
describe the steps of the scientific method.
define prediction and explain how it is used to formulate a hypothesis.
define inference and explain how it is used to form conclusions.
what makes scientific investigations similar to other types of investigations?
what makes scientific investigations different from other types of investigations?
what is pseudoscience? how is it different from non-science?
what errors tend to lead to pseudoscience?

The investigation of phenomena by experiments

Explanation:

Science involves the investigation of a phenomena by means of a set of steps  known as an experiment. The non-science means scientific methods and investigations cannot be carried out. A question must have variables that can be measured. Without the physical quantities, a question cannot be measured. The scientific method takes a number of steps. The essential steps are hypothesis and then doing an experiment to prove of disapprove the hypothesis.

answer: the enthalpy of the overall chemical reaction is +87.88 kj or +88 kj.

according to hess's law, the overall enthalpy of a reaction is the difference between the sum of enthalpy values of all the products and the sum of enthalpy values of all the reactants.

δh(reaction) = ∑nδh(products) - ∑nδh(reactants)

δh(reaction) = [δh +δh] - [δh]

δh(reaction) = [1(-287.02) + 1(0) ] - [1(-374.9)] kj = +87.88 kj

here, δh (pcl3) = -287.02 kj, δh(cl2) = 0, δh(pcl5) = -374.9 kj

therefore, enthalpy of the overall reaction is +87.88 kj or +88 kj.

it would be a gas formation