How can you tell if a chemical reaction occurred?

A. Change in color

B. Created gas

C. Change in Temperature

D. Formed a precipitate

E. All of the above

Which of the following is most likely to cause the particles in a chemical change to slow down A: Raising the thermal energy of the particles B: increasing the rate of the reaction C: Lowering the temperature D: adding heat to the reaction

In the formation of potassium chloride, the product, KCl, has less energy than the reactants, K and Cl2. This reaction is.

Explain how energy is transferred in a food web.

Use scientific notation to write the speed of light, 299,792,458 meters per second, accurate to five digits.

When pbi2 is added to na2co3 a white precipitate is formed. the white precipitate most likely is?

Understanding the high-temperature formation and breakdown of the nitrogen oxides is essential for controlling the pollutants generated by car engines.

A car driver accelerates to a speed of 35 mph and then takes her foot off the gas pedal. Even though she does not press the brake pedal at any time, she eventually rolls to a stop. Which of the following most likely causes the car to come to a stop?

A plasma-screen TV contains thousands of tiny cells filled with a mixture of Xe, Ne, and He gases that emits light of specific wavelengths when a voltage is applied. A particular plasma cell, 0.900 mm*0.300mm*10.0mm, contains 4.

Choose the answer that describes how density, pressure, and temperature would change if you could travel from the top of Earth's crust to the center of its core. А) Density and pressure would increase and temperature would decrease.

A 10 gram rubber ball is placed in a graduated cylinder filled with 15 mL of water. If the volume in the graduated cylinder increases to 21 mL after the ball sinks to the bottom of the cylinder, what is the density of the rubber ball?