Why was gold not historically used for tools?

When two substances are mixed and light is produced is it a chemical or physical change?

The most dangerous driving situation, and the one which produces car crashes daily is?

What are the formulas for the ionic compounds named sodium iodide and magnesium iodide

A 1.00-g sample of octane (C8H18) is burned in a bomb calorimeter that has a heat capacity of 5.80 kJ/°C. The temperature of the calorimeter rises from 25.00oC to 33.20oC. What is ΔU per mole for the combustion of octane?

My poem: Love oh love How I grew to sprout like thigh flower Broken pieces picked up and made as one You restored thee and me see thigh to thee no like or bia to thee no doubt of fool but heart of love I so scared to thigh love and love anyways I

If the density of Cu is 8.96g/cm cubed, what is the volume of 28kg of Cu?

A piece of iron can change in different ways. How is iron bending different from iron rusting?

Which organism would least likely be selectively bred A) Dandelions B) Nantes Carrots C) Belgian Blue Cattle D) Hypoallergenic Cats

You are given a clear solution of KNO3. Using 3-4 sentences explain how you would determine if the solution is unsaturated, saturated, or supersaturated

Which element combination (s) would result in electrons being shared? [] sodium (Na) and oxygen (O) [] carbon (C) and fluorine (F) [] oxygen (O) and hydrogen (H) [] aluminum (Al) and chlorine (Cl)