What substance is composed of one type of atom

An element has three stable isotopes with masses of 27.977 amu, 28.976 amu, and 29.973 amu. The heavier two isotopes have an abundance of 4.68% and 3.09%, respectively. What is the mass of the element? A) 29.251 B) 27.684 C) 28.085 D) 28.991 E) 30.

A calorimeter uses the principle that thermal energy flows from hotter ma

How is radar used to forcast weather?] A. It shows areas of high and low pressure B, It collects data in the upper atmosphere C. It collects weather data as part of a network around the country. D.

There are two types of circuits we can make and they are ...

What is an example of a dilute solution

Potassium iodide reacts with lead (II) nitrate in this precipitation reaction: 2 KI (aq) + Pb (NO3) 2 (aq) → 2 KNO3 (aq) + PbI2 (s) What minimum volume of 0.200 M potassium iodide solution is required to completely precipitate all of the lead in 155.

Which of the following best describes the valence electrons in a polar covalent bond? O A. The electrons are transferred to the atom with the higher electronegativity. B. The electrons are closer to the atom with the lower electronegativity. C.

Humans are protected from some infections by specialized cells which produce chemicals that

Describe the density of cold water with a high salinity compared to that of warm water with low salinity. Explain your reasoning

Identify the Lewis acid in this balanced equation: Central N is bonded above, left, and below to C H 3 and has 2 electron dots to the right. Plus. B is bonded above, below left, and below right to H. right arrow.