Answer:
As the police car moves towards them, the pitch of the police car's siren goes up because the sound waves get closer together in front of the police car. When the police car moves away from the person, the pitch goes down because the waves spread out behind the police and that makes the frequency go down.
Explanation:
Ionic compound
Al +3 charge, Aluminum
S -2 charge, Sulfur
Al2S3
Answer:
blowing wind
Explanation:
in a desert there is no water so that cuts the first two out. then for the wind... well there are no mountains or buildings in the desert to block the wind. the last answer, crustial uplift... how often does that happen... =)
Mg
......
Electron configuration:
²⁴₁₂Mg: 1s² 2s² 2p⁶ 3s²
>>> 3s² - valence shell with 2 valence electrons
One of the atoms involved must be a metal and the other a nonmetal
