Answer:
HNO3 is a strong acid
HCl is also a strong acid
NaCl is a salt so it is neither a strong acid nor a strong base
Ca(OH)3 is a strong base
Explanation:
Answer:
i think this would be an example of a physical change because here the substance is changing directly from a solid to a gas without passing through the liquid state which means that the composition of the substance has not changed and remains the same. This is also called sublimation.
Answer:
8.
Explanation:
Atomic number tells us the number of protons in an element. Mass number is the total amount of mass in an atom, and it comes from the sum of the mass of protons and neutrons, which are both considered to have a mass of 1 amu.
If the total mass is 16amu and 8amu comes from the 8 protons, the remaining mass comes from neutrons.
16 - 8 = 8
A Timeline<span> on </span>Atomic Structure<span>. 400 B.C. Democritus' </span>atomic theory<span> posited that all matter is made up small indestructible units he called </span>atoms<span>. ... 1803 John Dalton proposed that elements consisted of </span>atoms<span> that were identical and had the same mass and that compounds were </span>atoms<span> from different elements combined together.</span>
