Answer:The physical changes that are endothermic are melting, vaporization and sublimation.
Explanation:
Answer:
the protons
Explanation:
the number of protons is constant for each sample of the element. If the number of protons differs, then it is a different element.
Answer:
0.0222 mol KCl
Explanation:
2 KClO3 (s) 2 KCl (s) + 3 O2 (g)
2.73 g x mol
x g KCl = 2.73 g KClO3 x[ (1 mol KClO3)/ (122.5 g KClO3) ] x [(2 mol KCl)/ (2 mol KClO3)]
x g KCl = 0.0222 mol KCl
Answer: Option (c) is the correct answer.
Explanation:
Ionic compounds are the compounds formed by transfer of electrons. An ionic compound contains ions which are arranged in an ordered lattice.
This lattice is repeating in nature and thus results in the formation of a compound.
For example, NaCl is an ionic compound that has an ordered crystal lattice.
Thus, we can conclude that the statement they are made up of particles that are arranged in a repeating pattern, is true.
