An 80.0 g sample of iodine-131 was placed in a sealed vessel forty days ago. Only 2.5 g of this isotope is now left. What is its half-life?

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Calculate the mass defect for beryllium-9, the only isotope of beryllium. The mass of beryllium-9 is 9.012182 amu. The mass of a proton (p11) is 1.00728 amu; the mass of a neutron (n01) is1.00866 amu, and the mass of an electron (e10) is0.00055 amu.

What is the name of the isotope produced when Californium-251 emits an alpha particle?

Match the term with its description. Match Term Definition Pure substance A) Mixture that has its different components mixed unevenly within the substance Heterogeneous B) Liquid homogeneous mixture in which the solute is distributed evenly within

How can we make use of acids or bases to prevent growth of micro-organisms in swimming pools?

What does the cell theory state? A. that cells come from other cells B. that cells come only from animals C. that cells cannot be created or destroyed

For which one of the following molecules is the indicated type of hybridization not appropriate for M the central atom? a. BeCl2 sp2 b. SiH4 sp3 c. BF3 sp2 d. C2H2 sp e. H2O sp3

P4O10 (s) = - 3110 kJ/mol H2O (l) = - 286 kJ/mol H3PO4 (s) = - 1279 kJ/mol Calculate the change in enthalpy for the following process: P4O10 (s) + 6H2O (l) → 4H3PO4 (s)

Aluminum bromide reacts with chlorine gas to produce aluminum chloride and liquid bromide, according to the chemical equation below: 2A1Br3 + 3Cl2 + 2AlCl3 + 3Br2 How many moles of Aluminum chloride are made if 779 g of chlorine gas are consumed?

When a cell is in late anaphase of mitosis, which of the following will we see?