Which label shows the overall enthalpy change and is the reaction exothermic or endothermic? A, exothermic. B, exothermic. C, endothermic. D, endothermic.

Metals are very good conductors of electricity, while nonmetals are not. What does this say about the metalloids? A. They are more like nonmetals and similarly cannot conduct electricity well. B.

What type of reaction is the generic equation a + bc → ac + b?

Quais das substâncias abaixo não conduziram a corrente elétrica em solução aquosa

A 5.00 ml sample of this koh solution is added to a 250 ml volumetric flask, and water is added to the mark. what is the new molarity of k + ions in this solution?

Match the following words with their definitions. 1. number of protons in an atom element 2. negatively charged particle circling nucleus proton 3. matter made up of just one type of atom atomic number 4. building block of matter neutron 5.

To what chemical reaction class does this reaction belong? 2 mg (s) + o2 (g) 2 mgo (s)

Which best illustrates how particle arrangement changes when solids change into liquids

Express in scientific notation (6.0x10^4) (3.1x10^-1)

How do you measure the mass of a liquid?

Given the following information, calculate the mass for B-11. B-10 has a natural abundance of 19.9 percent, while B-11 has a natural abundance of 80.1 percent. The mass of B-10 is 10.013 amu.