Question 1 of 10 Which two reactions are slower than the others?
A. Silver tarnishes in air that contains hydrogen sulfide.
B. Lead nitrate and potassium iodide react to form a yellow
precipitate.
C. Iron metal reacts with oxygen in air to form rust.
D. Black powder in fireworks burns explosively to produce white
light.

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.

massxgravity x heght=weightxheight= pe

4900=490xh

h=10

continuous conducting path for current, power supply

3. dark matter

empty space could also be a simple vacuum