Which of the following single replacement reaction is done incorrectly? A. Sr + (NH4)2(CO3) → Sr(CO3) + NH4
B. Al + PB(NO3)2 -> Al(NO)3 + Pb
C. Fe + HCI → HFe + Cl2
D. KBr + Cl2 → KCI + Br2

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.

Is 9 correct? and can someone me with 10? it’s due tomorrow, you

Using the first volume and temperature reading on the table as v1 and t1, solve for the unknown values in the table below. remember to use the rules of significant figures when entering your numeric response.