Chemistry Answers

1.   How many moles of  CO₂ are produced according to equation (a) by the reaction of 6.0 mol of MgCO₃?

Determine the relative molecular mass \& relative formula mass of the following substances. [6] - Chlorine

An elevated level of sodium ions in the blood would be 0.155 mol L^-1 and would be cause for concern. The average adult female has a total blood volume of 4.70 L. Calculate the total mass of sodium ions present when this concentration is found, assuming a blood volume of 4.70 L. 

Determine the pH

pH of each of the following solutions.

Part A

4.0×10⁻² M

M HI

 How would a defined media composition differ if the nitrogen source is ammonium (NH4) or ammonium nitrate (NH4NO3)? How much of each of these compounds would you add to1L  of media if you wanted to maintain 10:1:0.1 (C:N:P) ratio with glucose as the sole carbon source at 1g/L? (25 points)

Complete the balanced molecular chemical equation for the reaction below. If no reaction occurs, write NR after the reaction arrow.

An ingestion tablet contains a mass of 0.30 g of magnesium hydroxide [Mg(OH)2] as its only basic ingredient. The balanced chemical equation between magnesium and hydrochloric acid (HCl(aq)), the acid produced in the stomach is as follows:

          Mg(OH)2(aq) + 2HCl(aq) ⟶ MgCl2(aq) + 2H2O(l)

(i) Calculate the volume of 1.00 M HCl neutralised by two of these ingestion tablets?

(ii) What mass of the salt is formed in this neutralisation reaction?

(iii) How many magnesium ions are present in this amount of a salt?

an electron (m_e = 9.10939 × 10^–28 g) moving at 4.20 × 10⁶ m/s in an electron microscope

Explain why AlCl3 is a stronger Lewis acid than Al(CH3) 3.

Why is the V soln .1?, Isn't that just the solvent?