Based on the information in the passage, what is the most likely reason why platinum is more valuable than gold? A. because it is less rare and easier to acquire than gold
B. because it is harder than gold and more resistant to wear
c. because it is a newer metal than gold and was recently discovered
d. because it is silver-white in color instead of bright yellow like gold

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? question 2 options: the balloons rise at the same rate. both balloons are the same size. the ballons both rise. the cold ballon is larger than the warm balloon. the cold balloon expands and rises. the warm balloon shrinks and sinks. the warm balloon expands and rises. the cold balloon shrinks and sinks.

You are given two vectors a⃗ =−3.00ι^ 5.00j^ and b⃗ =5.00ι^ 2.00j^. let the counterclockwise angles be positive.

How to tell if a molecule is polar or nonpolar with electronegativity