Which observation indicates that a chemical reaction has taken place? O A substance becomes warmer.
O A material changes from a solid to liquid.
O Bubbles form when a liquid is heated.
O A new chemical substance is formed.

What’s the percent by mass of carbon in c10h14n2

Answer explain why it is not possible to deduce a complete order of reactivity.

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