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.

adding a(n) to an electric circuit would increase the magnetic field around a wire;

b. solenoid

a solenoid is a type of electromagnet whose purpose is to generate a controlled magnetic field.

if the purpose of the solenoid is instead to impede changes in the electric current, a solenoid can be more specifically classified as an inductor rather than an electromagnet.

the temperature in kelvin of 2.0 dm3 of an ideal gas is doubled and its pressure is increased by a factor of four. what is the final volume of the gas