Answer:
C
Explanation:
This is right because that's how u describe it
Answer:
Hypothesis:
The amount of limestone that dissolves in the acid is directly proportional to the concentration of acid used.
Explanation:
Acids dissolve limestone according to the following general equation;
2HX(aq) + CaCO3(s) -------> CaX2(aq) + H2O (l) + CO2(g). Where HX represents any acid at all.
This dissolution process is a chemical reaction. It was experimentally observed that the amount of limestone that dissolved in acid depends on the concentration of acid. Various concentrations of acid were then prepared and a particular mass of limestone was dissolved in each concentration of acid. The amount of limestone dissolved in each case was carefully noted.
It was observed that as the concentration of acid increased, the amount of limestone dissolved increased also and vice versa, hence the hypothesis proposed above.
Answer:
False.....................................
The direction of the force of static friction is along the plane of contact, and is opposite to the direction in which there would be relative motion if there was no friction (for example, if one of the surfaces suddenly turned to ice). Hope this helped!
1: a system is a collection of two or more things/objects. but if you want to use a tennis ball for an example it would be considered an object but at an atomic level we could say it is a system. why? because, it is made up of millions of atoms and each and every atom could be considered an object
2: phone systems, ecological systems, space systems
3: the internal energy of the system can be understood by examining the simplest possible system. example: an ideal gas
4: electricity- by an electrical current.
