Which of the following statements best describes the relationship between elements and compounds? a. atoms of more than one element can combine in different ways to form the same product. b. a compound does not always have to contain the same number of atoms of each element. c. the properties of elements are much different from the properties of the compounds that they make up. d. the properties of compounds always resemble the properties of the elements of which they are made.

The answer is: B. A compound does not always have to contain the same number of atoms of each element.

Explanation:

In chemistry, a chemical compound is a substance formed by the chemical combination of two or more different elements of the periodic table.

The compounds are represented by a chemical formula. For example, water (H2O) consists of two atoms of hydrogen and one of oxygen.

The answer is: B. A compound does not always have to contain the same number of atoms of each element.

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.