Which is an endothermic process?

the process in which a substance loses heat energy

the process in which a substance loses kinetic energy

the process in which the molecular motion of a substance decreases

the process in which a substance gains energy

Which reaction is endothermic? H2 (g) + ½ O2 (g) → H2O (g), ΔH = - 57.82 kcal ½N2 (g) + O2 (g) + 8.1 kcal → NO2 (g) ½N2 (g) + 3/2H2 (g) → NH3 (g) + 11.0 kcal C (diamond) + O2 (g) → CO2, ΔH = - 94.50 kcal

Which allotrope of carbon is considered a decent conductor of electricity?

A neutral atom of silicon-30 contains 14 protons. How many electrons does it have?

What is the best conclusion according to the energy diagram of the chemical reaction?

Which statement best describes the polarity of the molecule Sil_? A. It is nonpolar, because the bonds between silicon (Si) and iodine (l) are not polar. B. It is nonpolar, because the bond polarities cancel each other out in a tetrahedral molecule.

Name two ways that living things use proteins

Solid lithium metal and diatomic fluorine gas react spontaneously to form a solid product. give the balanced chemical equation (including phases) that describes this reaction.

What is the best way to transform a chemical potential energy into internal kinetic energy?

A reaction starts with 20.0 grams of lithium hydroxide (LiOH) and produces 31.0 grams of lithium chloride (LiCl), what is the percent yield of lithium chloride (LiCl) ? * LiOH + KCl - LiCl + KOH A) 64.5% B) 88.6% C) 81.5% D) 92.8%

You aren't sure if your pH meter needs to be calibrated, so you put it in a buffer solution that has a known pH of 7. You take four separate readings of the solution with the pH meter. The meter reports the pH as 5.5, 8.6, 6.3, and 9.4.