What best describes earths mantle

Which of the changes are physical changes

Calculate the number of moles of NaHCO3 that reacted in each beaker. (The molar ratio between evolved CO2 and the bicarbonate, HCO3-, 1:1.)

A chemist prepares a solution of nickel (II) chloride (NiCly) by measuring out 61.3 umol of nickel (II) chloride into a 200 ml volumetric flask and filling the flask to the mark with water.

Compound A has a molecular formula C5H12, and monobromination of compound A produces only compound b.

Why does fossil fuel use in the United States make the U. S. vulnerable to the political wishes of foreign countries? a. The US is a net exporter of fossil fuels. b. Fossil fuels lead to global climate change. c.

Which term refers to an electrochemical cell that produces an electric current? A) electrolyte B) voltaic cell C) electrolytic cell D) cathode

How can you determine the valence electrons in an electron configuration?

Methods used to reduce sulfur dioxide emissions from smokestacks are an attempt by humans to A lessen the amount of insecticides in the environment B eliminate diversity in wildlife C lessen the environmental impact of acid rain D use non chemical

What does 54 in mn-54 represent

Valerie wants to examine the properties of a thick liquid but is finding it difficult to pour the liquid into a beaker. She needs to finish her investigation before the end of class.