A sample composed only of atoms having the same atomic number is classified as

(1) a compound (3) an element

(2) a solution (4) an isomer

Solid white phosphorus melts and then vaporizes at high temperature. gaseous white phosphorus effuses at a rate that is 0.404 times that of neon in the same apparatus under the same conditions.

Which term refers to how strongly an atom of an element attracts electrons in a chemical bond with an atom of a different element? (1) entropy (2) electronegativity (3) activation energy (4) first ionization energy

Balance this equation by inserting coefficients as needed, ZnS+H2Br2 and ZnBr2+H2S

Which of the following procedures demonstrates repetition? A. Jeremiah measures the mass of five different strips of metal. He places the strips in five different test tubes filled with hydrochloric acid.

What changes increases the pressure in a gaseous system?

What is temperature in science, how fast molecules move or how cold or hot something is?

Which describes an object's speed when free falling in a vacuum? The object accelerates until it reaches its terminal velocity. The object falls at a constant speed because only one force acts on it.

If you had 20,000 liters of NO2 how many moles would you have?

What does the name amino acid tell you about the structure of this molecule?

Fluorine is a toxic, reactive gas. which representation (structural formula, electron dot structure, or three-dimensional model) would you use to explain why fluorine is so reactive, why?