A student has a block of wood. She places it on a wooden desk. She uses a spring scale to measure how much force is needed to slide the block of wood across the desk. The student then places the block of wood on a piece of sandpaper and repeats the process. The type of force the student is investigating is .

A. gravitational
B. magnetic
C. electricity
D. friction

answer: the primary difference between a hypothesis and a theory is that b hypothesis is falsifiable, but a theory has been proven to be correct. theory is an explanation of something that is happening but hypothesis is a guess of something that can happen

explanation:

answer: -

reaction:

na + cl ⇌ nacl

balanced chemical equation:

na + 2cl ⇌ nacl2

sodium + clorine goes to form sodium chloride (table salt).

the product is nacl2.

and the reactants are na and cl.

(note: if you don’t know what ⇌ means, read below: -

⇌(double head arrow) means reversible reaction).