NEED HELP ASAP. PLEASE SHOW WORK 1) Carbon-14 has a half-life of 5730 years. If you start with a 2.37 g sample, how much would remain after 17,190 years?

2 ) Manganese-56 is a beta emitter with a half-life of 2.6 hours. What is the mass of manganese-56 in a 500 mg sample at the end of 10.4 hours?

3) A sample of thorium-234 has a half-life of 24.1 days. If that sample is allowed to decay for 96.4 days and 4.67 grams remains, what was the original mass of the sample?

Many reactions take place in aqueous solution. when potential reactants are mixed, a reaction will occur if there is some driving force that favors the formation of products. it is often convenient to categorize reactions in terms of these driving forces: precipitate formation, in which an insoluble solid is formed, weak electrolyte formation, as in a neutralization reaction involving water, or transfer of electrons, as in a redox reaction. these reactions can be represented by full molecular equations, which contain all species in the reaction mixture, or by net ionic equations, which show only the species that actually undergo a change. the latter does not contain the spectator ions, which do not undergo a net change or do not take part in the reaction. part a when the following two solutions are mixed: k2co3(aq)+fe(no3)3(aq) the mixture contains the ions listed below. sort these species into spectator ions and ions that react. drag the appropriate items to their respective bins. view available hint(s) spectator ions ions that react part b what is the correct net ionic equation, including all coefficients, charges, and phases, for the following set of reactants? assume that the contribution of protons from h2so4 is near 100 %.ba(oh)2(aq)+h2so4(aq)→ express your answer as a chemical equation. view available hint(s) nothing provide feedback

Which statement best explains the relationship between an area is geography and the temperature of its surface water

Question 3(multiple choice worth 4 points) (04.04 lc) what does it mean when an element is reduced? it empties a valance shell, reducing its atomic radius. it gains electrons, reducing its overall charge. it increases electronegativity, reducing its ability to bond. it loses electrons, reducing its electron number.