Which element has the same number of valence electrons as bromine (Br) ?
A. selenium (Se)
B. chlorine (Cl)
C. potassium (K)
D. krypton (Kr)
No, I already submitted it, but I will say the correct ones.
ok question 3 was D. it is a physical change because there is no reaction.
6 was D. Find the mass of a piece of ice. Let the ice melt. Find the mass of the liquid water.
and 8 was D. H2O
B. chlorine (Cl)
Why are sodium (Na) and potassium (K) in the same group on the periodic table?
A. They have similar atomic weights
B. They are both hard and brittle
C. They are both colorless
D. They have similar reactivity
D. They have similar reactivity
A student cuts some fabric into two pieces. Is this change physical or chemical?
This change is physical.
Ok which answer
B. it is physical change because the prosses is reversible
D. it is physical change because there is no reaction