Substance a contains 75% carbon and 25% hydrogen. substance b contains 80% carbon and 20% hydrogen. a and b are the same substance.

a. True

b. False

Which p[robing question lies within the scope of physic?

Which of these are true. A) in molecular compounds, more heat is needed to separate their molecules than is needed to separate ions. B) molecular compounds melt at much higher temperatures than do ionic compounds.

Gas is squeezed into a small container is it compressibility or heat of combustion

What solid is brown and red, crumbly and weak in the periodic table (probably a metal)

Critical Thinking Questions 8. What relationship exists between an atom's valence electrons and the number of dots in the Lewis structure of the atom?

Which type of soil holds the least water

Eq-43 which type of fire extinguisher should be onboard a vessel with a permanently installed fuel tank

5. Identify a suitable method that would be used to separate mixture of the follow [b]Water and ethanol c]Table salt dissolved in water d] iodine and potassium Pul the table below

How much energy is needed to convert 57.3 grams of ice at 0.00°c to water at 75.0°c? specific heat (ice) = 2.10 j/g°c specific heat (water) = 4.18 j/g°c heat of fusion = 333 j/g heat of vaporization = 2258 j/g?

A certain first-order reaction (A→productsA→products) has a rate constant of 9.90*10-3 s-1s-1 at 45 ∘C∘C. How many minutes does it take for the concentration of the reactant, [A][A], to drop to 6.