This chemical equation is balanced. 2Na + 2H20 → 2NaOH + H2
How does this equation show the conservation of matter in a chemical
reaction?
O A. The number of substances in the reactants is equal to the number
of substances in the products.
O B. The reactants and products have the same kinds of atoms and
equal numbers of each kind.
C. The coefficients and subscripts in the reactants are the same as
in the products.
D. The reactants and products are substances that each have equal
numbers of atoms.

Ateam of astronauts is on a mission to land on and explore a large asteroid. in addition to collecting samples and performing experiments, one of their tasks is to demonstrate the concept of the escape speed by throwing rocks straight up at various initial speeds. with what minimum initial speed vesc will the rocks need to be thrown in order for them never to "fall" back to the asteroid? assume that the asteroid is approximately spherical, with an average density p 3.84 x108 g/m3 and volume v 2.17 x 1012 m3 recall that the universal gravitational constant is g 6.67 x 10-11 n m2/kg2

The voltage applied across a given parallel-plate capacitor is doubled. how is the energy stored in the capacitor affected?

Ain is , is 's of ? 0.62 0.79 1.27 1.50