5. What happens when you make ice cubes by putting a tray of water in the

freezer?

a. The water gains cold from the freezer.

b. The particles of water stop moving.

C. The temperature of the water falls.

d. The water vaporizes.

A chemist requires 0.446 mol na2co3 for a reaction. how many grams does this correspond to?

What information is given by the superscripts in an electron configuration?

When substances are formed that are different from the starting substances, a physical change has occurred. True False

Which observations would have been consistent with Marie Curie's work? Check all that apply. O One gram of a uranium salt has twice the radioactivity as two grams of the same salt.

If an atom is found to have an atomic mass equal to 3 times greater than carbon, what is its atomic mass?

Which type of chemical reaction occurs in 2KClO3 Right arrow. 2KCl + 3O2

An electrochemical cell is constructed using two half-cells: Al (s) in Al (NO2) 3 (aq) and Cu (s) in Cu (NO3) 2 (aq). The two half cells are connected by a KNO3 salt bridge and two copper wires from the electrodes to a voltmeter.

7. If you fill a balloon with 5.2 moles of gas and it creates a balloon with a volume of 23.5 liters, how many moles are in a balloon at the same temperature and pressure that has a volume of 14.9 liters

Which compound is formed from its elements by an exothermic reaction at 298 K and 101.3 kPa?

State one major difference between having a nitrogen atom in a ring structure and having an oxygen atom in that structure