We can can measure the concentration of HCl solution (a procedure called standardizing the solution) by reaction with pure sodium carbonate: 2H+ + Na2CO3à2Na+ + H2O + CO2. A volume of 27.35±0.04 mL of HCl solution was required for complete reaction with 0.9674 ±0.0009 g of Na2CO3 (FM 105.988 ± 0.001). Find the molarity of the HCl and its absolute uncertainty. The concentration of HCL by reaction with pure sodium bicarbonate 2H++Na2CO3a2Na+H2O+CO2 a volume of 27.35+_0.04mL of HCL solution is required for the complete reaction with 0.9674+- 0.009g of Na2CO3 find the molarity of HCl and absolute uncertain

Which of the following statements is true? a. elements in the last period are radioactive. b. atomic weight is the same as atomic mass. c. elements in the same group have the same number of electron shells. d. atomic number equals the number of neutrons in the nucleus of an atom.

Match the following vocabulary terms to their definitions. 1. amount of energy required to change 1 gram of material from the solid to the liquid state at its melting point 2. a measure of the kinetic energy of the particles of a substance 3. the amount of heat energy required to raise the temperature of 1 gram of liquid water from 14.5°c to 15.5°c 4. amount of energy required to change 1 gram of material from the liquid to the gaseous state at its boiling point 5. the amount of energy required to change 1 gram of a substance 1°c a. temperature b. latent heat of vaporization c. latent heat of fusion d. calorie e. specific heat

The organism shown is a free-living one that is anchored to the bottom of ponds and streams during one stage of its life cycle what is the common name for the group to which this organism belong