Which chemical equation represents a double replacement reaction? O
2Na+Cl, → 2NaCl
Zn +2HCl → ZnCl, +H,
о
NaOH + HCl → NaCl+H,0
0 2KCIO, — 2KCl +30,

Which are advantages of renewable resources? check all that apply. renewable energy supplies are completely reliable everywhere. some renewable resources will never be used up. little or no waste is produced by renewable resource plants. electricity can be generated in large quantities. many renewable energy facilities have lower operating costs.

What quantity do units represent in value

22. the top of a cliff is located a distance h above the ground. at a distance h/2 there is a branch that juts out from the side of the cliff, and on this branch a bird's nest is located. two children throw stones at the nest with the same initial speed, one stone straight downward from the top of the cliff and the other stone straight upward from the ground. in the absence of air resistance, which stone hits the nest in the least amount of time?