Which of the following statements about compounds is true? A- Each Compound contains only one element.
A- Each Compound contains only one element.

B- Compound can be classified as either heterogenous or homogenous.

C- A Compound has a defined ratio by mass of the elements that it contains

D- Compounds Vary in chemical composition depending on the sample size.

Explanation:

A and D is the answer

Hope the answer is right

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.

c-14 is carbon-14, or radiocarbon.   it is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons.