What does the "proof" mean on a bottle of liquor? i know that 100 proof liquor is 50% alocohol and 80 proof is 40% and so on. but where does the term "proof" come from and why display it on the bottle? why not just say 50% alcohol etc etc?

Why will the reaction fail to work if the phase transfer catalyst is switched to ammonium chloride while retaining the same reactants, solvent, and base? Because it reacts with 2‑naphthol to make 2‑chloronaphthalene.

What button on a scientific calculator is used to enter a number in scientific notation? О A. Х O B. COS O C. EE O D. CLEAR

Which lists the substances from least to most acidic? A. ammonia, blood, milk, orange juice B. orange juice, milk, blood, ammonia C. ammonia, milk, blood, orange juice D. orange juice, blood, milk, ammonia

In a phospholipid the phosphate head is? and the acid tail is

Why are physical properties such as hardness or cleavage useful to geologists when identify minerals?

What phase change is endothermic

A Gran plot for a potentiometric titration resulted in a slope of 5.56 x 105. Measurements were made using SCE as the reference electrode and the analyte Eo was determined to be 0.354 V.

Aight imma let you guys i

In which choice is the ellipsis used correctly to select from this sentence from The Scarlet Letter? A throng of bearded men, in sad-coloured garments and grey steeple-crowned hats, inter-mixed with women, some wearing hoods, and others bareheaded,

Explain the difference between the greenhouse effect and global warming.