What are some observable indications that a chemical reaction has occurred?

Using the following combustion reaction, describe how it follows the laws of conservation of mass and energy. CH 4 + 2O 2 CO 2 + 2H 2 O+50.1kJ/g.

Use the following half-reactions to design a voltaic cell: Sn4 + (aq) + 2 e - → Sn2 + (aq) Eo = 0.15 V Ag + (aq) + e-→ Ag (s) Eo = 0.80 V What is the overall cell potential? Group of answer choices

When the skateboarder reaches the top of the half-pipe, what type of energy is at it's maximum?

Why do all my Girlfriends always cheat on me? I do nothing wrong and I treat them like no man ever has before. In a good way of course!

If the absorbance at 555nm wavelength of a 0.35 moles/liter sample of stained protein has an absorbance of 0.12, what is the concentration of a sample whose absorbance is 0.26. use beer's law.

How does heat transfer takes place between any two systems?

Hydrate name of CaCl2 * 8 H2O

Calculate the heat evolved from a mixture of 14.1 l of sulfure dioxide

Which stament best describes a solution

Which answer accurately describes the difference between speed and velocity? Read each answer choice carefully. Question 4 options: A. If speed is constant, then velocity is also constant. B. Speed requires direction.