True or false? dry ice subliming (turning from a solid straight into a gas) is an example of a chemical change.

Washing soda is a hydrated compound whose formula can be written NA2CO3 xH2O, where x is the number of moles of H2O per mole of Na2CO3. When a 2.123g sample of washing soda was heated at 130*C, all of the water of hydration was lost, leaving the 0.

What is the mass of 3.50 moles of silicon dioxide

Do most exothermic reactions have a negative or positive change in gibbs energy

A 35.0-9 piece of copper wire is heated, and the temperature of the wire changes from 29.0°C to 76.0 degrees * C. The amount of heat absorbed is 243 cal. What is the specific heat of copper?

As temperature increases, the amount of solute that a solvent can dissolve increases. True False

Our body solution tests at a pH of about 6.8. This pH is:

A diatomic gas has the molar mass of 38.00g/mol. what is the possible formula?

Which of the following is the final concentration of KCl if 500 ml of 0.25 M KCl is diluted to a final volume of 5 L? 0.025 L 0.0025 L 25 L 2.5 L

What do you use to measure mass

A salt shaker filled with 17.0g sodium chloride contain how many moles?