39) Which electron configuration represents the electrons of an atom in an excited state?

What are four surface features that are driven by plate tectonics

An atom of potassium has 19 protons and 20 neutrons. what is its mass number?

Consider this reaction: 3Fe2O3 (s) + CO (g) → 2Fe3O4 (s) + CO2 (g). Which of the following would increase the rate of the reaction? a. adding the Fe3O4 b. decreasing the temperature c. increasing the surface area of Fe2O3 d.

Many acids come from chemical supply companies in specially-coated glass bottles with extra-thick walls. What is the most likely characteristic of an acid that requires a special container?

Which is the correct name of a compound that is formed by Si and O? silicon dioxide silicon trioxygen disilicon dioxygen monosilicon oxide

Foods labeled "fat free" can actually contain less than 0.5 grams of fat.

Plants make their own food. The chemical reaction for this process is shown in the equation below. CO2 + H2O + energy → C6H1206 + O2 What are the products in this chemical reaction? O A. C6H1206 + energy O B. H20 + energy O C. CoH1206+02 O D.

Using ohm's law, explain how voltage changes in relation to current, assuming that resistance remains constant.

An average copper penny minted in the 1960s contained about 3.000 g of copper. how much chalcopyrite had be mined to produce 100 pennies?

Which pack has the greatest change in enthalpy, warm packs (such as hand warmers) or cold packs (such as an ice pack) ?