What are 4 indicators that a chemical reaction has occurred?

Thomson discovered the what in his cathode ray experiment?

At a certain temperature the vapor pressure of pure acetic acid HCH3CO2 is measured to be 226. torr. Suppose a solution is prepared by mixing 127. g of acetic acid and 141. g of methanol CH3OH.

Why is petroleum called liquid gold?

Which cell structures does this fish embryo cell contain? Select all that apply. cell wall nucleus chloroplasts mitochondria cell membrane

When pellets of NaOH (s) are added to a flask of water, it is observed that the temperature of the water increases as the pellets dissolve. Which of the following claims about the observed dissolution of NaOH (s) in water is most accurate?

A farmer has concerns about the nitrogen levels in her soils. What can she do to ensure that the nitrogen bacteria are replenished in the soil? Question 6 options: Clear cut the area surrounding the field.

The changing of gas to liquid

A very simple assumption for the specific heat of a crystalline solid is that each vibrational mode of the solid acts independently and is fully excited and thus cv=3NAkB=24.9 kJ / (kmol⋅K). This is called the law of Dulong and Petit.

How many elements are found in the following chemical equation? K + Cl → KCl A. 1 B. 2 C. 3 D. 0

How many liters of 0.85 M HCl solution would react completely with 3.5 moles Ca (OH) 2?