I NEED HELP PLEASE!

Suppose you fill an ice cube tray with water, weigh it, then place it in a freezer. After the water freezes, will the tray of ice weigh the same as the starting tray of water? Why or why not?

Which of the following is always a reactant in a combustion reaction? oxygen nitrogen hydrogen carbon

George is a dalmatian puppy. describe what happens to light that allows you to see george’s black and white coat.

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