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Questions in chemistry

[Homework Help] Common Polyatomic Ions | Chemical Name | Chemical Formula | Chemical Name | |---|---|---| | acetate | [tex]$C _2 H _3 O _2^{-}$[/tex] | nitrite | [tex]$NO _2^{-}$[/tex] | | carbonate | [tex]$CO _3^{2-}$[/tex] | ammonium | [tex]$NH _4^{+}$[/tex] | | hypocarbonite | [tex]$CO ^{2-}$[/tex] | cyanide | [tex]$CN ^{-}$[/tex] | | hydrogen carbonate (bicarbonate) | [tex]$HCO _3^{-}$[/tex] | hydroxide | [tex]$OH ^{-}$[/tex] | | chlorite | [tex]$ClO _2^{-}$[/tex] | peroxide | [tex]$O _2^{2-}$[/tex] | Type the correct answer in the box. Express your answer to three significant figures. This balanced equation shows the reaction of sodium hydroxide and sulfuric acid: [tex]$2 NaOH + H _2 SO _4 \rightarrow Na _2 SO _4+2 H _2 O$[/tex]. In a laboratory experiment, a student mixes 355 grams of sulfuric acid with an excess of sodium hydroxide. What is the theoretical mass of sodium sulfate produced? Refer to the periodic table and the polyatomic ion resource. The theoretical mass of sodium sulfate is $\square$ grams.

[Homework Help] Aluminate ion is a: 1) Positive radical 2) Negative radical 3) Negative element 4) Positive element

[Homework Help] What is a vapor? A. A substance that has a much higher melting point and boiling point than other similar substances B. A substance that is always in the solid or liquid phase at room temperature C. A substance that is in the gas phase at a temperature at which it would normally be a solid or liquid D. A substance that forms a gas, but only at very high temperatures

[Homework Help] What is the temperature of 0.750 mol of a gas stored in a [tex]$6,850 mL$[/tex] cylinder at 2.21 atm? Use [tex]$P V=n R T$[/tex] and [tex]$R=0.0821 \frac{L \bullet \text { atrm }}{ mol \bullet K }$[/tex]. A. 2.95 K B. 5.24 K C. 138 K D. 246 K

[Homework Help] If a silver nitrate solution is added to excess sodium sulfide, this reaction takes place: [tex]2 AgNO_3(a q)+Na_2 S(a q) \rightarrow Ag_2 S(s)+2 NaNO_3(a q)[/tex] Suppose you use 0.0150 liter of a 2.50 M solution of silver nitrate. Assuming the reaction goes to completion, how much silver sulfide is produced? Use the periodic table. A. [tex]1.49 g[/tex] B. 4.55 g C. 9.30 g

[Homework Help] Ph-CH(Br)-CH(Br)-Ph -> Zn/CH3OH

[Homework Help] 37) Give reasons why elements of group VIIA in the periodic table are very reactive. 38) Give reason for decreasing reactivity of elements as we go down the group. 39) Give reason why elements of group VA in the periodic table are very reactive. 40) Give reason for increasing reactivity of elements as we go down the group IA. 41) What is the reason for the fact that reactivity of group 'V' element decreases as we go down the group?

[Homework Help] The correct dimensional analysis equation is shown here: [tex]3.00 L CaCl_2 \times \frac{0.100 mol CaCl_2}{1 L} \times \frac{2 mol AgNO_3}{1 mol CaCl_2} \times \frac{1 L}{0.100 mol AgNO_2}[/tex] Did you perform the calculation correctly? A. Yes, I got the correct answer. B. Yes, but I got the wrong answer because of a math error. C. No, I did not set up the calculation correctly.

[Homework Help] Which word equation shows hydrogen reacting with oxygen to form water? A. oxygen + water → hydrogen B. hydrogen + oxygen → water C. oxygen + water → hydrogen + water D. hydrogen + water → oxygen

[Homework Help] Which reaction shows that the enthalpy of formation of $H _2 S$ is $\Delta H_{ f }=-20.6 kJ / mol$? A. $H _2(g)+ S ( s )+20.6 kJ \rightarrow H _2 S$ B. $H _2(g)+ S ( s ) \rightarrow H _2 S+20.6 kJ$ C. $2 H (g)+ S (s)+20.6 kJ \rightarrow H _2 S$ D. $H _2(g)+ S ( s ) \rightarrow H _2 S-20.6 kJ$