A sample of i-131 decays from 12 microcuries to 3.0 microcuries in 16 days. what is the half-life of i-131?

You place a balloon in a closed chamber at standard temperature and pressure (STP). You halve the chamber pressure. What happens to the balloon? Explain how you got your answer. a). It doubles in volume. b).

What inspired Mendeleev to create his organization for the elements

sodium azide is an ingredient often added to the medium to select for certain types of bacteria. this compound inhibits components of the respiratory electron transport chain.

Soaps are less soluble in hard water why?

An individual orders an alcoholic beverage in a private club what is the first question the server should ask

Which of the following best describes the motion of the particles in a piece of steel?

Student follow up The ionic equation for the reaction between zinc and sulfuric acid is. Zn (s) + 2H (aq) - - Zn" (aq) + H2 (g) a State what has been oxidised in this reaction. Explain your answer in terms of electrons.

What kind of group 1 atoms are the most reactive? a. Small atoms c. Atoms with the most electrons in the valence level b. Large atoms d. Atoms at the top of the periodic table

What does it mean when there are 2.3 x 10-4 moles?

Electric force is an A. attraction and repulsion between protons and electrons . B. attraction and repulsion between protons and neutrons. C. attraction and repulsion between neutrons and electrons.