Which of the following is true for all chemical reactions? . a) the total mass of the reactants increase. b) the total mass of the products is greater than the total mass of the reactants. c) the total mass of the products is less than the total mass of the reactants. d) the total mass of the reactants equals the total mass of the products

Option (d) is the correct answer.

Explanation:

A chemical reaction is a reaction which bring changes in the chemical composition of a substance.

For example,

Mass of Na = 23

Mass of Cl = 35

Hence, total mass of reactants = g/mol

                                                    = 46 + 70 = 116 g/mol

Total mass of products = g/mol

                                       = g/mol = 116 g/mol

So, we can see that formation of new bonds take place in a chemical reaction and no change in the mass of reactants or products occur.

Also, according to the law of conservation of mass, the mass of reactants equals the mass of products in a chemical reaction.

Thus, we can conclude that out of the given options, this is true for all chemical reactions that the total mass of the reactants equals the total mass of the products.

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explanation:

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.