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Questions in chemistry

📝 Answered - When an atom of the unstable isotope Na-24 decays, it becomes an atom of Mg-24 because the Na-24 atom spontaneously releases: 1. an alpha particle 2. a beta particle 3. a neutron 4. a positron

📝 Answered - How many formula units of [tex]$NaNO_3$[/tex] are in 5.23 moles of [tex]$NaNO_3$[/tex] (Mw. 85.00 g/mol)?

📝 Answered - After decaying for 48 hours, 1/16 of the original mass of a radioisotope sample remains unchanged. What is the half-life of this radioisotope?

📝 Answered - What is formed when two atoms of bromine bond together? 1. a monatomic molecule 2. a diatomic molecule 3. a heterogeneous mixture 4. a homogeneous mixture Gold can be flattened into an extremely thin sheet. The malleability of gold is due to the 1. radioactive decay mode of the isotope Au-198 2. proton-to-neutron ratio in an atom of gold 3. nature of the bonds between gold atoms 4. reactivity of gold atoms

📝 Answered - Which of the following is considered to be a dangerous procedure in the laboratory setting? A. Pouring all liquids, especially acids and bases, over the sink B. Wearing goggles C. Pushing glass tubing, thermometers, or glass thistle tubes through a rubber cork D. Pointing the mouth of a test tube that is being heated away from you and others E. Knowing where the fire extinguisher and eyewash stations are located

📝 Answered - In most of its compounds, this element exists as a monatomic cation. A. F B. S C. N D. Ca E. Cl

📝 Answered - Used to deliver acids and bases in a titration: A. Calorimeter B. Geiger counter C. Burette D. Funnel E. Bunsen burner

📝 Answered - Where does the blood pick up oxygen?

📝 Answered - What are two conditions atoms must have in order to form covalent bonds with one another?

📝 Answered - The diagram below represents the bright-line spectra of four elements and a bright-line spectrum produced by a mixture of three of these elements. Can someone help me with this one? I dont understand that at all :(