What is amethyst's hardness

This is my last question! Look at the following hypothetical reaction: A+3B-->C+3D Assume that the equation is balanced. In which of the following reactant mole ratios will reactant B be the limiting reagent? a) A:4B b) A:5B c) 2A:7B d) A:B

What volume of water should be used to dissolve 19.6 g of LiF to create a 0.320 M solution?

What is the product of Ag+KNO3 if using single replacement

How many molecules of o2 are required to form 13.5 g of water vapor?

A solution of hydrocloric acid has a molarity of 2.25 M HCl. If a reaction requires 5.80 g of HCI, what volume of a solution should be used? Assume a molecular mass of 36.45 g for the HCI. Calculate the number of moles of solute required: g) (36.

Hydrogen peroxide decomposes to water and oxygen at constant pressure by the following reaction: 2H2O2 (l) → 2H2O (l) + O2 (g) ΔH = - 196 kJ Calculate the value of q (kJ) in this exothermic reaction when 3.

What is the concentration of hydronium in each of the following cases: [OH-] = 10-12 M? [OH-] = 10-2 M?

Which statement best explains why elements are matter? An element is a physical substance that has mass and takes up space. Elements are pure substances that cannot be divided chemically. Each element is a pure substance composed of one type of atom.

Which of the following best describes what causes the phases of the moon? The alignment of the sun, Earth, and moon The speed of the moon around the Earth The speed of the Earth around the sun The alignment of the planets

At which temperature would atoms of a He (g) sample have the greatest average kinetic energy? (1) 25°C (3) 273 K (2) 37°C (4) 298 K