Which of the equations below represents the correct balanced equation?
a. mg (s) + hcl (aq) --> mgcl2 (aq) + h2 (8)
b. mg (s) + 2hcl (aq) --> mgcl2 (aq) + h2 (8)
c. 2mg (s) + hci (aq) --> mgcl2 (aq) + h2 (8)
d. 2mg (s) + 2hcl (aq) --> mgcl2 (aq) + h2 (8)

Which of these conditions most likely produces an unstable isotope?

What produces wave a)sound b) heats c)transfer of energy d)vibrations

Plz me ! 1 which of earths spheres contains most of its mass? a atmosphere b hydrosphere c geosphere* d biosphere 2 erosion and weathering are examples of which types of forces? a constructive forces b destructive forces* c gravitational forces d inertia-related forces 3 which of the following statements about earths atmosphere is true? a earths atmosphere contains 78% water vapor which is essentail to life b earths atmosphere contains 21% oxygen c earths atmosphere contains carbon dioxide which all life forms require d earths atmosphere allows radiation from the sun to pass through it and warm earths surface* 4 the strenght of the force of gravity between two objects is determined by which of the following factors? select all that apply a the messes of the objects* b the distance between the objects* c the volumes of the objects d the surface area of the objects 5 earth and moon are kept in there respective orbits due to the influence of a inertia b gravity c gravity and inertia* d neither gravity or inertia if you answer all questions right i will give