Which of the following is true for combustion reactions?

Energy is absorbed.

Energy is released.

Hydrogen is a reactant.

Nitrogen is a reactant.

Orbitals are defined by which term? • spin direction • energy level • composition • number of electrons

What has a pH level of less than 7? Acid Bases Neutral

An ice cube at 0.00 ∘C∘C with a mass of 21.5 gg is placed into 500.0 gg of water, initially at 31.0 ∘C∘C, in an insulated container.

What is the amount of Al2S3 remains when 20.00 g of Al2S3 and 2.00 g of H2O are reacted? A few of the molar masses are as follows: Al2S3 = 150.17 g/mol, H2O = 18.02 g/mol and Al2S3 (s) + 6 H2O (l) → 2 Al (OH) 3 (s) + 3 H2S (g)

Ecologists use similarities between terrestrial ecosystems to classify them into larger categories called ... A. Littoral Zones B. Climatographs C. Biomes D. Limnetic Zones

What does the chemical formula C3H2O, tell about a molecule of the compound it represents?

No two different elements will have the atomic number.-

Which two scenarios illustrate the relationship between pressure and volume as described by Boyle's law? 1. The pressure in a closed bottle decreases when the bottle is squeezed. 2.

0.210 mol of octane is allowed to react with 0.760 mol of oxygen. which is the limiting reactant?

The national drug code number (NDC) of the drug is included in this section of a drug monograph