What does your percent composition tell you about a molecule? a) it tells you the ratio of elements in the molecular formula b) it tells you the total number of atoms in the molecules c) it tells you how the elements are arranged in the molecule d) it tells you how much of a molecule is made up of each elements

it tells you how much of a molecule is made up of each element

Explanation:

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The correct option is (A).

Explanation:

Percent composition of a molecule tells us about the ratio of different elements which are present in the molecule.

For example: is molecular formula for calcium carbonate,in which calcium, carbon and oxygen atoms are present in ratio of 1 : 1 : 3 Or we can also say that molecule of calcium carbonate is made up five atoms out of which one atom is of calcium, one is of carbon atom and remaining three are of an oxygen.

Hence, the correct option is (A).

answer; talc and gypsum;

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.