Which change occurs when an atom in excited state returns to ground state? 1 energy is emitted 2energy is absorbed 3 the number of electrons decreases 4 the number of electrons increases

An elements atomic number is 117 how many electrons would an atom of this element have?

The molar solubility of silver sulfite in a 0.177 M potassium sulfite solution is ...

The initial temperature of the water in a constant-pressure calorimeter is 24°C. A reaction takes place in the calorimeter, and the temperature rises to 87°C. The calorimeter contains 367 g of water, which has a specific heat of 4.18 J / (g·°C).

When will the population of prey increase greatly? A) when the population of predators is low B) when the population of predators is moderate C) when the population of predators is high D) when the population of predators swells E) when the

If someone told you they had a career in either ecology, paleontology, or botany, what area of science is this? Question 2 options: astronomy biology physics chemistry

Energy stored in the bonds that hold together the atoms and molecules of all substances is called Energy stored in the bonds that hold together the atoms and molecules of all substances is called

Which of the following requires an oxidizing agent? Al yields Al3+ 2 O yields O2 Cl2 yields 2 Cl- Ag + yields Ag

If a color change occurs when two solutions are mixed has a chemical reaction likely occurred?

Using the following thermochemical data, what is the change in enthalpy for the following reaction? Ca (OH) 2 (aq) + 2HCl (aq) → CaCl2 (aq) + 2H2O (l) CaO (s) + 2HCl (aq) →CaCl2 (aq) + H2O (l), ΔH = - 186kJ CaO (s) + H2O (l) →Ca (OH) 2 (aq), ΔH =

1. Calculate the end velocity of a rocket that traveled 16km in 2 seconds. distance time 2. Calculate the rockets acceleration m with a start velocity of 0m/s and the end velocity from #1 for 10 seconds.