Which element is non-metallic and a gas at room temperature? a. Nitrogen (N)
(E) Silicon (Si)
b. Potassium (K)
d. Sodium (Na)

Δu of , in kj/kg, as it isto k, (a)as a of , (b) at , (c) at .

Consider the following unbalanced equation for the combustion of hexane: αc6h14(g)+βo2(g)→γco2(g)+δh2o(g) part a balance the equation. give your answer as an ordered set of numbers α, β, γ, use the least possible integers for the coefficients. α α , β, γ, δ = nothing request answer part b determine how many moles of o2 are required to react completely with 5.6 moles c6h14. express your answer using two significant figures. n n = nothing mol request answer provide feedback

An atomic nucleus is composed ofa)protons.b)protons and neutrons.c)protons and electrons.d)protons, neutrons, and electrons.