Which of these substances is not an element?

a. water

b. hydrogen

c. aluminum

d. iron

Hexyne. What does the name of this hydrocarbon tell you about its molecular structure?

Two basic properties of the gas phase are

The heat of fusion of a compound is 333.6 joules per gram

A wave has a wavelength of 12 mm and a frequency of 6 hertz. What is its speed?

How many mold are in 4.25x10^-2 atoms of lead

The balanced equation below represents the reaction between magnesium metal and hydrochloric acid to produce aqueous magnesium chloride and hydrogen gas. Mg (s) + 2HCl (aq) = = > MgCl2 (aq) + H2 (g) A piece of Mg (s) has a volume of 0.

What is the molarity of a solution prepared by dissolving 33.4 g of sodium chloride in some water and then diluting the solution to a volume of 300.00 mL?

Think about how pressure relates to volume and how gas behavior would change in different volumes. Which of the following will have the largest positive value for Sº? A) 1 mole of helium gas at 1 atm pressure.

Does a reaction stop once it has reached equilibrium? Explain

8 l of water at 19 ∘c are mixed with 1.1 l of water at 47 ∘c in an insulated container. what is the final temperature of the system? express your answer in ∘c