Pesticides are best described as a substance used for destroying or killing insects and pests harmful to plants and animals.
The answer is A. Tessa does more work than Cindy because she weighs more. The work being done is determined by both force and distance. When distance is same, the bigger force, the more work.
The fact that only certain colors appear in an element's atomic emission spectrum means that only certain frequencies of light are emitted. The electrons in atoms are a different story. Electrons are attracted to the nucleus through a different fundamental force, called the electromagnetic force. This force is less intense. The electrons have a little wiggle room. An electron can absorb energy, either from colliding with another atom or by absorbing a tiny packet of light called a photon. An electron can move away from or closer to the nucleus depending on its energy.
A volatile impurity, is an impurity that evaporates quickly, so, if you were to conduct an experiment on a substance with this type of impurity, the evaporation point, and the mass of the substance at high temperatures would be in error.