Answer:
lower temperature
Explanation:
When we boil water at vacuum, it boils at a lower temperature than the normal temperature
Boiling is defined as a physical phenomenon where bubbles are formed and they turn into vapor when the liquid is brought into heat.
The pressure is also decreased when water is heated under vacuum. The atmospheric pressure is reduced as the pressure is removed when water water boils at vacuum.
Thus, water inside vacuum boils at a lower temperature than it does under the normal pressure.
Answer:
i think the answer is helium (top right in periodic table)
The answer is D: only the arrangement of atoms.
MgCl2 because it is the only option in which a metal appears with a nonmetal. In this case, the metal transfers electrons to the nonmental because the metal has a lower ionization energy.
Beta decay by emitting an electron is called as β⁻ decay. when this happens, a neutron of the element converts into a proton by emitting an electron. Hence, the mass of daughter nucleus is same as parent atom but atomic number/number of protons is higher by 1 than atomic number of parent atom.
Sr has atomic number as 38.
After β⁻ decay, the daughter nucleus will have atomic number as 38 + 1 = 39.
Hence, the daughter nucleus should be Y (Yttrium). Formula is,
₃₈⁹⁰Sr → ₃₉⁹⁰Y + ₋₁⁰β + energy
