Ibeg you i realy need when the characteristics or state (solid, liquid or gas) of a substance change but the chemical composition does not change that is an indication of: a physical change a chemical change a global change no change which of the following is an extensive physical property of matter? volume viscosity odor density the percentage by mass of elements in a particular pure substance will vary from sample to sample. true false classify each of the following as an element, compound, or mixture. mixture compound element answer a. propane gas b. soil (dirt) c. solid gold coin

Which compound contains both ionic and covalent bonds? a) hbr b)cbr4 c)nabr d) naoh

Hey guys so i need to know what is _nh3+> nh4oh ~chemistry~

The image compares the arrangement of electrons in two different neutral atoms. a figure labeled atom q has a shaded sphere at the center of three concentric circles. the innermost circle has two black spheres. the middle circle has six black spheres. to the left of this figure is another figure labeled atom p. atom p has a shaded sphere at the center of three concentric circles. the innermost circle has two black spheres. the middle circle has seven black spheres. which of the following best explains the position of the two atoms in the periodic table? atom p has an estimated zeff of 7 and is therefore to the left of atom q, which has a zeff of 6. atom p has an estimated zeff of 7 and is therefore to the right of atom q, which has a zeff of 6. atom p has an estimated zeff of 5 and is therefore below atom q, which has a zeff of 4. atom p has an estimated zeff of 5 and is therefore above atom q, which has a zeff of 4.