Which change occurs when an atom in an excited

state returns to the ground state?

(1) Energy is emitted.

(2) Energy is absorbed.

(3) The number of electrons decreases.

(4) The number of electrons increases.

Express the equilibrium constant for the following reaction. P (g) + 3/2 Cl2 (g) ↔ PCl3 (g) K = [PCl3]^2/[P]^2[Cl2]^3K = [PCl3]/[P][Cl2]^3/2K = [P][Cl2]^3/2/[PCl3]K = [P]^1/2[Cl2]^1/3/[PCl3]^1/2K = [PCl3]^2/[P]2[Cl2]3

How do you think bubbles affect sound in the global ocean?

In a galvanic cell, anode is where oxudatuon takes place?

In an oil spill, why does the oil not mix with the sea water? A. Lipids are hydrophobic B. Lipids are hydrophilic. C. Lipids are saturated. D. Lipids are unsaturated.

Gas syringe bung chips 25 cm of dilute hydrochloric acid Which channes slow down the rate of reaction? Decrease the size of pieces of marble chips Decrease surface area of marble chips Inercase concentration of acid Increase temperature of acid

What does the number next to the ion signify?

Write a molecular equation for the precipitation reaction potassium chloride and lead (II) acetate

Which outcome is not caused by gravitational force?

Explain the properties of the substance around us depend on the atoms and molecules that compose them

What is an ion (1 mark) what is the charge on a chloride ion (1 mark) what is an ionic bond (1 mark)