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Questions in chemistry

📝 Answered - A chemist is trying to identify a sample of metal that is listed in this table. She passes an electrical current through the metals listed in the table; it's one of the best conductors. Then she heats the metal to [tex]$1000^{\circ} C$[/tex]. The metal doesn't melt. Which type of metal does the chemist have? | Material | Melting Point ([tex]${}^{\circ} C$[/tex]) | Electrical Conductivity Ranking | | :------- | :----------------------------- | :----------------------------- | | aluminum | 660 | 3 | | copper | 1085 | 2 | | zinc | 420 | 4 | | silver | 962 | 1 | | nickel | 1455 | 5 | A. aluminum B. copper C. Zinc D. silver E. nickel

📝 Answered - What happens during chemical reactions? A. The total amount of energy changes. B. Atoms are changed into new elements. C. Total mass increases in the products. D. Energy is given off or absorbed.

📝 Answered - What is the correct formula that would result from the combination of the two ionic species? [tex]$Mg^{2+} \text { and } PO_4{ }^{3-}$[/tex] A. [tex]$Mg _3\left( PO _4\right)_2$[/tex] B. [tex]$Mg _2\left( PO _4\right)_3$[/tex] C. [tex]$Mg \left( PO _4\right)_3$[/tex] D. [tex]$MgPO _4$[/tex]

📝 Answered - Which of the following items are examples of Class 3 Flammable Liquids? Select the three (3) correct options. Nail Polish Helium Hairspray Bleach Gasoline

📝 Answered - Summarize what you have studied. If a substance is ionic, then it likely will...

📝 Answered - Use the periodic table to write the electron configuration of selenium (Se). Place the sublevels in order of filling from least energy to most energy.

📝 Answered - Given the table, what is the value of A, B, C, or D?

📝 Answered - In the structure of 4-isopropyl-2,4,5-trimethylheptane, identify the primary, secondary, tertiary, and quaternary carbons. Use the abbreviations: p is primary, s is secondary, t is tertiary and q is quarternary.

📝 Answered - A radioactive nuclide has 53 protons and 78 neutrons. Which is the symbol of this nuclide? A. ${}_{78}^{53}X$ B. ${}_{53}^{78} Pt$ C. ${}_{76}^{131} Pt$ D. ${}_{53}^{131}X

📝 Answered - Use the periodic table to complete this equation that represents nuclear fission processes. ${ }_{92}^{235} U+{ }_0^1 n \rightarrow{ }_{56}^{139} Ba+{ }_{B}^{A} C+3{ }_0^1 n$ A: $\square$ B: $\square$ C: $\square$