An atom has 5 protons and 7 neutrons. What is its mass number?

What is another name for taxonomy

Luke can paint 91 portraits in 7 weeks. How many portraits can Luke paint in 4 weeks?7

Calculate the standard cell potential at 25 ∘c for the reaction x (s) + 2y + (aq) →x2 + (aq) + 2y (s) where δh∘ = - 793 kj and δs∘ = - 319 j/k. express your answer to three significant figures and include the appropriate

Part a ammonia can be produced via the chemical reaction n2 (g) + 3h2 (g) ⇌2nh3 (g) during the production process, the production engineer determines the reaction quotient to be q = 3.56*10-4. if k = 6.

Bromine (Br,) is observed as a red-brown color During the bromination of benzene, an electrophilic aromatic substitution, why does the red-brown color of Br2 disappear as the reaction progresses? a.

What is the independent and dependent variable for a dry ice experiment

a substance that undergoes a physical change like melting is still the same substance is it true or false

What is a polar molecule

A mixture of He He, N 2 N2, and Ar Ar has a pressure of 22.1 22.1 atm at 28.0 28.0 °C. If the partial pressure of He He is 2475 2475 torr and that of Ar Ar is 1049 1049 mm Hg, what is the partial pressure of N 2 N2?

Oceans make the temperaturs of nearby land more extreme ... True or false