Which two elements have the same number of valence electrons?

A.) Na and Sr

B.) Zr and H

C.) O and S

D.) Mg and P

19. Why is slow-freezing so damaging to food compared to fast freezing?

What is the difference in hydrogen ion concentration between hydrochloric acid and a lemon

What is true about the solution process involved in an instant cold pack? The process is endothermic and has a negative enthalpy of solution. The process is exothermic and has a negative enthalpy of solution.

What is biological difference

If a hypothetical future Earth has increased the amount of radiation emitted to 604 W/m, calculate the hypothetical global surface temperature in degrees Kelvin and then in Celsius

The solubility of carbon dioxide gas in water can be increased by

What two quantities are conserved in every chemical reaction? a. moles and mass c. volume and mass b. mass and atoms d. moles and atoms?

What two chemical mechanisms change pyruvate to acetyl-CoA in the pyruvate dehydrogenase complex? Group of answer choices a) Decarboxylation and condensation. b) Oxidation and decarboxylation. c) Condensation and dehydrogenation.

Which earth cycle does the suns energy drive

How many moles are in 10 grams of CaCl2?