What step occurs first in a scientific investigation and in the development of a new technology?

What body part sorts food and air so they can make it to the proper body system for processing?

Identify the following as mineral or ore: A) it is always made up of the same chemical element or elements. B) it contains crystals of a specific shape. C) it is the primary product of mining. D) it is rock containing elements to be extracted.

Suppose that a fictitious element, x, has two isotopes: 59x (59.015 amu) and 62x (62.011 amu). the lighter isotope has an abundance of 71.7%. calculate the atomic mass of the element x.

Um átomo X possui 8 neutrons e seu número atômico e igual a 8. Sabendo que esse atomo é isótopos de Y, que possui número de massa 18, responda: Qual o numero de nêutrons do atomo Y?

The reaction between 4-methyl-1-pentanol and pbr3 to yield 1-bromo-4-methylpentane is probably:

What volume of carbon dioxide measured at STP will be formed by the reaction of 1.42 mol of oxygen with 0.900 mol of ethyl alcohol?

Substance A and substance B were dissolved in two separate 100 mL beakers of water, which each started at a temperature of 25.1°C. The mixtures' temperatures were measured and recorded as shown in the table below. Substance Initial Temp. Final Temp.

Jaina just got home from a difficult workout. She is complaining of muscle soreness and cramps. Which waste product of fermentation caused the soreness and cramps?

Balance equation C5H10+O2=CO2+H2O

The Scott Test is used when which drug is suspected?