A student applies heat to a solid substance. Which indicates that a chemical change occurred? A. The substance becomes a liquid but solidifies when cooled.
B. The substance changes color and stays that color when cooled.
C. The substance goes from a liquid to a gas very quickly.
D. The substance expands but stays the same color.

Ab c or d ? i’m not sure what the answer is

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

Compare sympathetic and parasympathetic