A student in chemistry class mixes two clear solutions together. Which of the following is the best evidence that a chemical reaction has occurred? Question 5 options:

The solutions are soluble when mixed together.

The volume of the liquids increased.

A Yellow precipitate is formed when mixed together.

One liquid is insoluble in the other liquid.

The atomic number, or number, is the described as the number of in the nucleus of an chemical element.

What volume of a 0.0606 m solution of strontium bromide is needed to obtain 0.340 mol of the compound? question 42 options: a)5.61 l b) 3.4 l c) 600 ml d) 1 l e) 178 ml

How does a catalyst increase the speed of a reaction? a. the catalyst eliminates the activated complex stage, allowing products to form immediately. b. the catalyst lowers the energy level of the reactants, making it easier for them to react. c. the catalyst makes it easier for the activated complex to form, lowering the activation energy. d. the catalyst raises the energy level of the products, making the reaction finish sooner. reset next