What is mass?

A. the amount of matter in a substance

B. the amount of weight in a substance

C. the number of atoms in a substance

D. the amount of volume of a substance

Use the born-haber cycle to calculate the lattice energy of kcl. (δhsub for potassium is 89.0 kj/mol, ie1 for potassium is 419 kj/mol, ea1 for chlorine is - 349 kj/mol, the bond energy of cl2 is 243 kj/mol, δh∘f for kcl is - 436.5 kj/mol.)

Determina el pH del café cuya concentración de H + es de 0.00001M

At the same temperature and pressure, 1.0 liter of CO (g) and 1.0 liter of CO2 (g) have A. equal masses and the same number of molecules B. different masses and a different number of molecules C. equal volumes and the same number of molecules D.

a student places a sample of white sodium bicarbonate powder in a test tube and heats it. The student observes that the sodium bicarbonate undergoes a chemical change. After the change, what must be true about the substance in the test tube?

Describe how protons, neutrons, and electrons each affect the charge and mass of an atom.

Do all organisms perform meiosis?

which one of these reactions is energy released? A all reactions B no reactions C endothermic reactions D exothermic reactions

Why do ionic compounds conduct electricity when dissolved in water but most covalent compounds do not?

Which of the following is an example of a molecule? F C Al O2

Organize the items listed into the proper sequence of events for gas exchange. a: O2 is transported to cells by circulatory system. b: O2 is drawn into the lungs during inhalation. c: Cells use O2 and generate CO2. d: CO2 is exhaled.