Answer:
Explanation:
A physical change is a change in which the physical properties of matter are altered. These are properties are the forms and state.
Most physical changes are easily reversible and are pure state changes.
They do not lead to the production of new compounds.
They involve no mass change and requires little to no energy.
Examples are melting, boiling, freezing, sublimation e.t.c
CaBr2-potassium chloride
Li2O-calcium bromide
Answer:
it helps
Explanation:
i
A. hair roots
B. red blood cells Although blood is an excellent source of DNA, the DNA does not come from the red blood cells, as these cells have no nuclei. Rather, the DNA comes chiefly from white blood cells in the blood.
C. epithelial cells in urine
D. muscle tissue
E. saliva
The name for the compound is Calcium difluoride
Answer:
Xenon
Explanation:
Avogadro’s number represent the number of the constituent particles which are present in one mole of the substance. It is named after scientist Amedeo Avogadro and is denoted by .
Avogadro constant:-
Let the molar mass of the element is x g/mol
So,
atoms have a mass of x g
Also,
atoms have a mass of g
This mass is equal to 848 g
So,
x= 131.3 g/mol
This mass correspond to xenon.