A chemical engineer has determined by measurements that there are 7. 8 moles of carbon in a sample of nickel tetracarbonyl. How many moles of oxygen are in the sample?.

What element has similar physical and chemical properties as boron.

Which words or phrases identify layers of groundwater? check all that apply. water table kettle lake saturation zone underground lake sinkhole will give brainiest, answer quickly.

Explain how global warming could have affected yellowstone frog and salamander habitat's, resulting in changes in the populations of these species