Density, Mass, or Volume can be used to identify an unknown substance

If you have the element Boron (B) with a mass number of 10, 5 protons, 5 neutrons and 6 electrons, what would be the isotope/ion symbol?

Calculate the vapor pressure of water above a solution prepared by adding 24.5 g of lactose (C12H22O11) to 200.0 g of water at 338 K. (Vapor-pressure of water at 338 K 187.5 torr.)

Which of these is NOT a geologic process? A. erosion B. glaciation C. soil formation D. volcanic eruption

Calculate the amount of heat energy required to evaporate 27.5 g of water at 100.0°C. (molar heat of vaporization of liquid water = 4.07 ✕ 104 J/mol) a. 6.20 ✕ 107 kJ b. 2.02 ✕ 104 kJ c. 1.22 ✕ 10-2 kJ d. 6.20 ✕ 104 J e. 1.12 ✕ 103 kJ

g Given the reaction 4NH3 (g) 5O2 (g) - -> 4NO (g) 6H2O (g), what is the numerical value and sign in front of the change in [ammonia] over time for the rate expression of ammonia

There are three ways that heat can move from one place to another. Use examples pertaining to how heat is transferred from the sun to Earth and in the land, ocean, and atmosphere to explain all three.

What is temperature? A measure of the kinetic energy of a system. Energy of a system. How hot something is. A measure of density.

How many molecules of sodium nitrate are produced when 17 g of sodium azide, NaN3, react according to the following equation: NaN3 (aq) + AgNO3 (aq) - --> AgN3 (s) + NaNO3 (aq) Question options: 3.7x1023 1.6 x 1023 1.85x1023 6.02x1023

Which statement is true for the given reaction? Zn + PbSO4

A student states the following: "Since acetone (nail polish remover) evaporate more readily than water, one would assume that acetone has weaker intermolecular forces than water." Evaluate their claim. (2 sentences)