Why is coal not classified as a mineral?
a. it is made of organic material
b. it has no crystal shape
c. it is not a solid
d. it does not occur naturally p. s theres not a science option so i just put chemistry

How does a catalyst increase the speed of a reaction? a. the catalyst eliminates the activated complex stage, allowing products to form immediately. b. the catalyst lowers the energy level of the reactants, making it easier for them to react. c. the catalyst makes it easier for the activated complex to form, lowering the activation energy. d. the catalyst raises the energy level of the products, making the reaction finish sooner. reset next

Which symbol can be used to indicate the pressure at which a chemical reaction is carried out? 25°c 2 atm pa

If a simple machine aduces the strength of a force, what must be increased? the speed of the input force the work the simple machine performs the size of the simple machine the distance over which the force is applied