Astronomers expect the milky way to collide with the andromeda galaxy in about 3 billion years.
a. true
b. false

Yes, it is true that astronomers expect the Milky Way to collide with the Andromeda galaxy in about 3 billion years. It is more than 3 billion years, however - more like 4, but it is still inevitably going to happen. By then, our Sun is probably going to die and destoy the Earth, but we won't be alive to see it anyways, so it doesn't really matter.

The activity series is shown in the attached picture. if the element is below the other, then you can displace the other. following the activity series as a guide, the reactions are as follows: nickel and aluminum chloride3 ni + 2 alcl₃  → 3 nicl₂ + 2 albarium and copper bromideba + cubr  →  no reaction because cu is less oxidizable than bapotassium nitrate and aluminum3 kno₃ + al  → al(no₃)₃ + 3 ksodium phosphate and zincnaso₄ + zn  → znso₄ + na

Non metal is an element or substance that is not a metal metal is a solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivitymetalloid is an element (e.g., germanium or silicon) whose properties are intermediate between those of metals and solid nonmetals. they are electrical semiconductors.