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Questions in chemistry

[Done] Ions that are made of more than one atom are examples of polyatomic ions.

[Done] Compare the element hydrogen with the alkali metal sodium.

[Done] What is the volume of 14.0 g of nitrogen gas, \([tex]N_2[/tex]\), at a pressure of 2.00 atm and a temperature of 27.0 degrees Celsius? A. 5.60 L B. 6.15 L C. 11.2 L D. 12.3 L

[Done] Melted rock can ooze out from below Earth's surface through a crack in the crust called a ______?

[Done] Lead(II) sulfate is precipitated from a mixture of water solutions of potassium sulfate and lead(II) nitrate. Write the word equation and balanced chemical equation for this double replacement reaction. Word Equation: Potassium sulfate + Lead(II) nitrate → Potassium nitrate + Lead(II) sulfate Balanced Chemical Equation: [tex] \text{K}_2\text{SO}_4(aq) + \text{Pb(NO}_3)_2(aq) \rightarrow 2\text{KNO}_3(aq) + \text{PbSO}_4(s) [/tex]

[Done] A solution has a pOH of 8.7. What is the pH of the solution? Is the solution acidic, basic, or neutral?

[Done] What is the percent mass/volume of a sodium chloride solution made by dissolving 5.0 grams of sodium chloride in 40.0 mL of solution?

[Done] Stainless steel is an alloy of iron containing 5 percent nickel and 0.175 percent chromium. How many atoms of nickel are present in an 84 g sample of this alloy? Answer in units of atoms.

[Done] Write the balanced equation for the neutralization reaction between HI and Ba(OH)₂ in an aqueous solution. Include physical states.

[Done] What contains 15 neutrons and 13 protons?