A chemical or physical change that releases heat into its surroundings is ...

A. An exothermic process

B. melting ice

C. endothermic process

D. A phase change

What are the key characteristics of a synthesis reaction

According to the following balanced reaction, how many moles of NO are formed from 8.44 moles of NO2 if there is plenty of water present? 3 NO2 (g) + H2O (l) → 2 HNO3 (aq) + NO (g)

How does the shape of the Earth affect the climate of different regions?

A hydrogen electron jumps from energy level n = 2 to n = 4 after energy absorption. What will the spectral lines emitted by this electron look like under a spectroscope? a. a dark line spectrum b. white light c. a continuous spectrum d.

The car wit fastest acceleration is the tempest. it has an acceleration of 6.1 m/s. suppose the car accelerates from rest to a final speed of 30. m/s. how long does it take the tempest to reach this speed?

Is fire hot or cold?

In Flask A, you reacted 7.23 g Mg with 1.05 mol HCl. In Flask B, you reacted 1.22 g Mg with 1.35 mol HCl. Which balloon will inflate the most?

I have 2 electrons is the first shell, 8 in the second, and 6 in the third

The production of plastics makes life, so it benefits society. On the other hand, the production of plastics causes air and water, so it also harms society.

The total number of moles represented by 20 grams of CaCO3 is