Practice: Balance each of the chemical equations below. (Some equations may already be in balance.) In the space to the right, classify the reaction as a synthesis, decomposition, single replacement, or double replacement reaction. ___ AgNO3 + ___ KCl à ___ AgCl + ___ KNO3

___ H2O + ___ SO3 à ___ H2SO4

___ KI + ___ Cl2 à ___ KCl + ___ I2

___ NaHCO3 à ___ Na2CO3 + ___ H2O + ___ CO2

___ Zn + ___ HCl à ___ ZnCl2 + ___ H2

___ BaCl2 + ___ Na2SO4 à ___ BaSO4 + ___ NaCl

___ C3H8 + ___ O2 à ___ CO2 + ___ H2O

___ Al + ___ CuCl2 à ___ AlCl3 + ___ Cu

Electromagnets coils of wire paper clips picked up 10 3 15 6 20 9 25 12 ms. owens' class was studying magnets. ms. owens showed her students how to make an electromagnet using a nail, a d-cell battery, and plastic coated wire. the students wrapped the wire around the nail and then attached the ends to the battery. when they were finished, they tested their magnets by investigating how many paperclips their magnets could pick up. they also tested whether they could increase the strength of their electromagnets by using more coils of wire. they recorded the class average of their results in the data table seen here. ms. owens asked her students to graph their data in a line graph. how should the students label the x-axis on their line graph? a) size of battery b) number of paper clips c) number of coils of wire d) strength of electromagnet