Net ionic equation for Barium metal+platinum (IV) nitrate.

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.

i think it is true since you can test the answer and can use observations to complete it.

"record the time to complete a chemical reaction" would most likely be part of a lab procedure.

може ли да зареждате повече информация, моля