PLEASE HELPPP Identify the reaction as
a single replacement, double displacement or an acid base reaction.

a) Carbonic acid (H. CO,) and magnesium hydroxide react to form magnesium carbonate and water.

b)Aluminum chloride reacts with sodium carbonate to produce aluminum carbonate and sodium chloride.

c)Chromium metal and tin (IV) chloride react to form chromium (III) chloride and tin metal.

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? a. the balloons both rise. the cold balloon is larger than the warm balloon. b. the balloons rise at the same rate. both balloons are the same size. c. the warm balloon expands and rises. the cold balloon shrinks and sinks. d. the cold balloon expands and rises. the warm balloon shrinks and sinks.

Cucl2 + 2nano3 cu(no3)2 + 2nacl what is the percent yield of nacl if 31.0 g of cucl2 reacts with excess nano3 to produce 21.2 g of nacl? 49.7% 58.4% 63.6% 78.7%

In 2002, the rare earth elements mine in mountain pass, california was closed because