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Questions in chemistry

[Answered] Are the following ammonium compounds soluble in water? | Compound | Solubility | | :------- | :--------- | | $NH _4 OH$ | | | $NH _4 Cl$ | $\checkmark$ | | $( NH _4)_2 O$ | $\checkmark$ | | $NH _4 I$ | $\checkmark$ | | $NH _4 Br$ | $\checkmark$ | | $NH _4 NO _3$ | $\checkmark$

[Answered] What would most likely be included in the "Analysis" section of a lab report? A. a discussion of any errors in the experimental data B. a list of the supplies that were used in conducting the experiment C. suggestions for new experiments based on the results D. a description of what the dependent and independent variables were

[Answered] Verify your calculations for the rate. Are you reporting your data with the correct number of significant figures? | Concentration of iodide anion solution (mM) | 20.1 | 20.1 | | :------------------------------------------ | :---- | :---- | | Concentration of thiosulfate anion solution (mM) | 176.0 | 176.0 | | Concentration of hydrogen peroxide solution (mM) | 20.0 | | | Temperature of iodide anion solution (${ }^{\circ} C$ ) | 10.0 | | | Volume used of iodide anion solution ($I ^{-}$)(mL) | 1.0 | | | Volume used of hydrogen peroxide solution ($H _2 O _2$ )( $m _{1+1} y _{11}$ and $y _1$. | 8.8 | | | Time (s) | | | | Observations | | | | Initial concentration of iodide anion in the reaction (mM) | 47.6 | | | Initial concentration of thiosulfate anion in the reaction (mM) | 0.96 | |

[Answered] Fill in the systematic names of the following chemical compounds. Note: for compounds containing hydrogen, you may give the common name instead. | molecular formula | name of compound | | :---------------- | :--------------- | | $N _2 F_4$ | | | $NF _3$ | | | $P _4 S_3$ | | | $P _4 S_7$ | | | $H _2 O$ | |

[Answered] Which statement best describes the relationship between activation energy and rate of reaction? A. Increasing the activation energy can increase the rate of a reaction. B. Reducing the activation energy can increase the rate of a reaction. C. Increasing the reaction energy does not alter the rate of reaction. D. Reducing the activation energy can decrease the rate of a reaction.

[Answered] Calculate the current that must be passed into a solution of aluminum salt for 1 hr 30 minutes in order to deposit 1.5 g of Aluminum. $(Al = 27)$

[Answered] X is a solution containing 6.0g/dm³ of HCl. Y contains 12g/dm³ of Na2CO3.XH2O. A student treated 25cm³ of Y with x using methyl orange as an indicator, and the average titer value was 12.9cm³. a) Write a balanced equation for the reaction. b) Calculate: i) the concentrated anhydrous Na2CO3 in solution Y ii) the value of x iii) the percentage of water of crystallization in solution y c) What type of salt is NA2CO3.XH2O?

[Answered] A physical chemist measures the temperature [tex]$T$[/tex] inside a vacuum chamber. Here is the result: [tex]$T=-13.8^{\circ} C$[/tex] Convert [tex]$T$[/tex] to SI units. Round your answer to 4 significant figures.

[Answered] Use [tex]$pH=-\log [H+]$[/tex] to find [tex]$[H+]$[/tex] Milk has a pH of 6.6. What is the hydrogen concentration [tex]$[H+]$[/tex] (in moles per liter) of milk? A. [tex]$-\log 6.6$[/tex] B. [tex]$log 6.6$[/tex] C. [tex]$10^{-6.6}$[/tex] D. [tex]$10^{6.6}$[/tex]

[Answered] A student sets up the following equation to solve a problem in solution stoichiometry: [tex]$\left(539 . \frac{mg}{dL}\right)\left(\frac{10^{-3} g}{1 mg}\right)\left(\frac{1 dL}{10^{-1} L}\right)\left(\frac{10^{-3} L}{1 mL}\right)=\text { ? }$[/tex] Enter the units of the student's answer.