Is freeze-drying a physical change or chemical change?

What is the molar mass of a gas that has density of 2.054 g/l

Which of the following is not one of the steps in the scientific method a. hypothesize b. summarize c. analyze d. familiarize

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