When an unknown solid was added into a volumetric cylinder with 25.00 mL of water, the new volume came to 55.00 mL.  If the mass of the solid is 81.00 g, find the density of the unknown material.

Do the following calculation and write the answer in proper number of significant figures 58 / 12.5 =

You have to measure and dispense 10.00 mL of saturated NaCl. Which of the following glassware would you use for this purpose?

Identify thenumber of significant figures in thefollowing number 15.026

If a Bunsen burner gives a yellow flame, which of the following part is needs an adjustment?

Identify thenumber of significant figures in thefollowing number 56.0560

The net ionic equation for the reaction of sodium carbonate with hydrochloric acid is Doc2.docx

What is the molecular geometry for H2O?

Which of the following shows the molecular equation for sodiumcarbonate with hydrochloric acid reaction? A)  Na2CO3  +  2HCl  →  2NaCl  +  H2O  +  CO3 B)  NaHCO3  +  HCl  →  NaCl  +  H2CO3 C)  NaHCO3  +  HCl  →  2NaCl  +  H2CO3 D)  Na2CO3  +  2HCl  →  2NaCl  +  H2O  +  CO2

A calorimeter is to be calibrated:  51.203 g of water at 55.2 Celsius is added  to a calorimeter containing 49.783 g of water at 23.5 Celsius. After stirring and waiting for the system to equilibrate, the final temperature reached 37.6 Celsius. Calculate the calorimeter constant.  Heat =mass X specific heat X change in temperature