Answer:
A substance containing only one type of atom is a chemical element.
Yeah that’s true because a chemical reaction can’t be changed but a physical change can be changed :)
Answer:
Convert the mass of each element to moles using the molar mass from the periodic table. Divide each mole value by the smallest number of moles calculated. Round to the nearest whole number. This is the mole ratio of the elements and is represented by subscripts in the empirical formula.
Explanation:
The result is the molecular formula
The answer to your question is D. Sound waves travel faster in more dense material, and the more dense the material the louder the sound is.