How do you knowif something is spontaneous?

List 4 factors that suggest a chemical reaction has taken place

Which of the following provide information about the shape of an orbital a: n=1 b 1, 2, 3, 4 c n=2 d s, p,

Radioactive cobalt-60 is frequently used in treating cancer. It took 24 years for a 10 gram sample to decay to 0.625 grams. What is the half-life of the sample?

Which branch of chemistry is most likely to involve the study of the earth's crust

An atom has 17 protons and 18 neutrons. Which symbol represents that atom, including its mass number? 35Cl 33Ar 32Cl 34S

If the total atmospheric pressure is 760.00 mmHg what is the partial pressure of CO2

Which statement is true? k The letter has neither reflection nor rotation symmetry. k The letter has rotation symmetry only. The letter has reflection symmetry only. The letter has both reflection and rotation symmetry.

What is the product of one equivalent of phosphorus and three equivalents of hydrogen? Draw it's Lewis structure, making sure to include all lone pairs (if necessary).

Why is hydrogen bonding only possible with hydrogen? Hydrogen is the most electronegative element. Hydrogen's nucleus is electron deficient when it bonds with an electronegative atom Hydrogen tends to form covalent bonds.

What is the temperature at which a solid melts? a physical property a chemical property a chemical change a physical change