Answers cannot complete your homework for you, sorry.
But you can follow the link, below, to learn more about pure substances vs mixtures.
Hydrogen bonds is the process when hydrogen atoms interact and are attracted to other atoms such as nitrogen. It happens naturally in substances like water.
This occurs because bromine has stable isotopes of mass 79 and 81. There is a slight natural excess of the lighter isotope, so that the average is 79.9.
It grew out of the earth naturally and when it dies it becomes part of the earth again.
Compounds are made by combining two elements to an exact percentage, to change one thing would revert it to its original elements. Mixtures are combinations of two elements that do not depend on this as a mixture is not chemically bound. Jay Sanga
Br2 and C6H14 are soluble in non-polar solvents such as CCl4.
Chemistry explain the chemical composition and structure of materials, the interaction of substances and produce new materials.
it is the something that can hear
A law is a description of a naturally occurring phenomenon, whereas a theory attempts to explain a law.
minerals : solid homogeneous inorganic substances occurring in nature having a definite chemical composition.vitamins : any of a group of organic substances essential in small quantities to normal metabolism.-----SAIVIJAYA KRISHNA
Hydrogen bonds is the process when hydrogen atoms interact and are attracted to other atoms such as nitrogen. It happens naturally in substances like water.
Mass number is the average of all the naturally occurring isotopes of that element. When calculated, this average is not a whole number.
raw material - gold, bauxite, diamond natural resource - trees, water, animals basically raw materials are ores found in their state i.e bauxite is found in the ground and aluminum is extracted from it natural resource are naturally occurring and don't need altering, generally have uses to human beings
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mathematically it was calculated that for the Rutherford model to be stable it would require that 1000 or more electrons be in a single atom, but atoms only have (naturally occurring atoms) less than 100 electrons.
it has dissolved substances in it
There is ample evidence that ebola is a naturally-occurring virus. There are many animals with antibodies to ebola and similar viruses. It is human nature to look for a conspiracy to explain such a natural force, but there is no science behind the belief that ebola is man-made.