Which of the following is true for the endothermic reaction Ba (OH) 2 (aq) + NH4NO3 (aq) - - > Ba (NO3) 2 (aq) + 2NH3 (aq) + 2H2O (l) ?

A: H>0 S>0

B: H<0 S<0

C: H>0 S<0

D: H0

Consider a hypothetical metal that has the following lattice parameters: α = β = γ = 90° and a = b = 0.298 nm and c = 0.480 nm.

What is the molarity of a solution in which 0.732 moles of hcl are dissolved in 0.975 liters of solution?

Which of the following elements has the lowest electronegativity? Ca Sr Fr

Write the complete electron configuration for manganese

Give two reasons why global warming is bad.

Equilibrium reaction chromate

How does food in a fridge cool down

How many electrons would be found in the ion whose symbol is given below? N3-

In an atomic model that includes a nucleus, positive charge is a. located in the space outside the nucleus. b. spread evenly throughout an atom. c. concentrated at multiple sites in an atom. d. concentrated in the center of an atom.

In the Table of Atomic Particles, various symbols have two numbers. The top number represents the atomic mass of the particle, what do the bottom numbers represent? Select all that apply.