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Questions in chemistry

[Terjawab] What element on the periodic table is a radioactive gas with 136 neutrons?

[Terjawab] What is the molarity of 5.00 g of NaOH in 750.0 mL of solution?

[Terjawab] 1) Solid sodium iodide does not conduct electricity. Why does a sodium iodide solution conduct electricity? 2) When sodium iodide is electrolyzed, iodine is formed at the positive electrode. Complete and balance the half-equation for the formation of iodine: \[ 2 \text{I}^- \rightarrow \text{I}_2 + 2 \text{e}^- \] 3) What is formed at the negative electrode when sodium iodide solution is electrolyzed? Explain why.

[Terjawab] Distinguish between the terms "insoluble" and "unsaturated." Give an example to illustrate each term.

[Terjawab] If a jar of honey sits for a long time, sugar may crystallize in the jar. Describe two possible causes for the crystallization.

[Terjawab] Suppose that you are given two unlabeled beakers. One beaker contains water, and the other beaker contains a solution of ethanol and water. How could you safely determine which beaker contains just water?

[Terjawab] If a handsaw does the same amount of work on a log as a chainsaw does, which has more power? Why?

[Terjawab] The total amount of _________ is the same before and after any transformation.

[Terjawab] The rate law for a hypothetical reaction is given by: \[ \text{rate} = k [A][B] \] If the concentrations of \( A \) and \( B \) are both \( 0.020 \, \text{moles per liter} \) and \( k = 1.3 \times 10^{-1} \, \text{M}^{-1}\text{s}^{-1} \), what is the reaction rate?

[Terjawab] Describe the steps involved in the fractional distillation of crude oil.