At constant pressure, which of these systems do work on the surroundings? A ( s ) + B ( s ) ⟶ C ( g ) A(s)+B(s)⟶C(g) 2 A ( g ) + 2 B ( g ) ⟶ 5 C ( g ) 2A(g)+2B(g)⟶5C(g) A ( g ) + B ( g ) ⟶ C ( g ) A(g)+B(g)⟶C(g) 2 A ( g ) + 2 B ( g ) ⟶ 3 C ( g )

Which statement best describes how atoms combine to form sodium chloride (nacl)? a. a positively charged sodium ion and a positively charged chlorine ion form an covalent bond. b. a positively charged sodium ion and a negatively charged chlorine ion form an covalent bond. c. a positively charged sodium ion and a positively charged chlorine ion form an ionic bond. d. a positively charged sodium ion and a negatively charged chlorine ion form an ionic bond.

Elements in group 2 are all called alkaline earth metals. what is most similar about the alkaline earth metals?

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