The density of platinum is 21.45 g/cm' at 20 °C. What is the mass of 25.00 cm' of platinum in units of kilograms?

Complete this brønsted-lowry reaction placing each product by its appropriate label. hso4- + hcn

Select the correct answer. which statement is true about a polarized object? o a. it gains electrons and becomes negatively charged. ob. it gains protons and becomes positively charged. oc. the number of positive and negative charges can be the same. od. it has to be a metal. o e. there is no change in the distribution of the charge in the object. reset next what

What are the 4 phases of matter in order of increasing engery content?