Which balanced equation represents an endothermic reaction?

(1) C (s) + O2 (g) → CO2 (g)

(2) CH4 (g) + 2O2 (g) → CO2 (g) + 2H2O (l)

(3) N2 (g) + 3H2 (g) → 2NH3 (g)

(4) N2 (g) + O2 (g) → 2NO (g)

How is air temperature usually measured?

What do you need to know describe the velocity of an object

Why does claudius plan to poison the drink?

The symbol for carbon is The symbol for hydrogen is The symbol for nitrogen is gen is The symbol for iron is The symbol for copper is

An atom of 118Xe contains___ neutrons? A) 118 B) 54 C) 64 D) 172 E) 110

Phosphine, an extremely poisonous and highly reactive gas, reacts with oxygen gas to form tetraphosphorus decaoxide and water.

What element is reduced in the following reaction? Pb + SO42 - + AuCl4 - yields PbSO4 + Au + Cl- A) Pb B) Au C) S D) O

Compare and contrast between nuclear fission and fusion

Water has unique properties which include its strength as a solvent; its three environmental stages of solid, liquid, and gas; and its temperature regulation. these properties are due to polar covalent bonds between oxygen and hydrogen.

What happens to the temperature of a substance while it is changing state? Explain