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Questions in chemistry

[Terjawab] Differentiate between electropositivity and electronegativity.

[Terjawab] Select the correct formula for the polyatomic ion. You can find a list of common polyatomic ions by clicking here. The formula for ammonium carbonate: A. $NH _4 \cdot HCO _3$ B. $NH _4 CO _3$ C. $\left( NH _4\right)_2 CO _3$

[Terjawab] A scientist wants to determine how many moles of chromium (Cr) would be needed to react completely with 8.22 mol of oxygen $(O_2)$. $2 Cr+O_2 \rightarrow 2 CrO$ How many moles of chromium are needed? $8.22 mol O_2$ $\square$ $\square$ $\square$ $\square$ $=$ $\square$ mol Cr

[Terjawab] Know how to handle chipped or broken glassware. Identify all actions that you should take if you have chipped or broken glassware. Notify your teacher. Have the custodian clean it up after school. Sweep it into a corner. Notify classmates. Dispose of it in the designated glass waste area.

[Terjawab] The periodic table is based on an element's A) molecular mass. B) molecular size. C) atomic number. D) atomic mass.

[Terjawab] The standard reaction free energy [tex]$\Delta G^0=70 . kJ$[/tex] for this reaction: [tex]$MgCl_2(s)+H_2 O(l) \rightarrow MgO(s)+2 HCl(g)$[/tex] Use this information to complete the table below. Round each of your answers to the nearest kJ. | reaction | [tex]$\Delta G^0$[/tex] | |---|---| | [tex]$MgO (s)+2 HCl (g) \rightarrow MgCl _2(s)+ H _2 O (l)$[/tex] | kJ | | [tex]$\frac{1}{2} MgO ( s )+ HCl ( g ) \rightarrow \frac{1}{2} MgCl _2(s)+\frac{1}{2} H _2 O ( l )$[/tex] | kJ | | [tex]$\frac{1}{4} MgCl _2(s)+\frac{1}{4} H _2 O ( l ) \rightarrow \frac{1}{4} MgO ( s )+\frac{1}{2} HCl ( g )$[/tex] | 18 kJ |

[Terjawab] The valence of aluminum is +3, and the valence of chlorine is -1. The formula for aluminum chloride is correctly written as A) $ClAl _3$. B) $Cl _3 Al$. C) $Al _3 Cl$. D) $AlCl _3$.

[Terjawab] Fill in the name and empirical formula of each ionic compound that could be formed from the ions in this table: | cation | anion | empirical formula | name of compound | |---|---|---|---| | [tex]$Mg^{2+}$[/tex] | [tex]$MnO_4^-$[/tex] | | | | [tex]$Cr^{3+}$[/tex] | [tex]$OH^-$[/tex] | | | | [tex]$Ca^{2+}$[/tex] | [tex]$NO_3^-$[/tex] | | |

[Terjawab] Name the family to which each organic compound belongs. The first answer has been filled in for you. | compound | family | | :---------------- | :----- | | [tex]$CH _3- O - CH _3$[/tex] | ether | | [tex]$CH _3- OH$[/tex] | | | | | | | |

[Terjawab] What is its noble gas configuration for silicon, Si? A. [Ne] 3s^2 3p^4 B. [Ne] 3s^2 C. [Ne] 3s^2 3p^1 D. [Ne] 3s^2 3p^2