groups in the periodic table Flashcards
does reactivity increase or decrease as you go down group 1
increases
why does reactivity change as you go down group 1
there will be more electron shells as you go down so, the attraction between the nucleus and the outer electron will be smaller so it can be more easily lost
what do you see when sodium reacts with water
-forms silver ball
-fizzes rapidly
what do you see when lithium reacts with water
-fizzes steadily and becomes smaller
what do you see when potassium reacts with water
there is lilac flame
-fizzes
what is the test for chlorine
hold a damp blue litmus paper. if chlorine present, it will bleach it white
does reactivity increase or decrease as you go down group 7
decreases
why does reactivity change as you go down group 7
as you go down, more electron shells are added so the force of attraction is less, making it harder to gain an electron
what are redox reactions
halogen displacement reactions
what is the rate of reaction
how quickly a reaction happens
what are the 3 different ways to measure rate of reaction
-precipitation
-change in mass
-volume of gas given off
how can precipitation be used to measure rate of reaction
this only works when the reaction is between two see-through solutions
place the flask on top of paper with a mark
-how fast the mark disappears if the rate of the reaction
how can change in mass be used to measure rate of reaction
if gas is released, there will be a loss in mass. constantly measure the mass and when the mass stops changing, that is when the reaction finishes
how can the volume of gas be used to measure rate of reaction
use a gas syringe to measure the volume of gas given off. the more gas given off, the faster the reaction. when no gas is produced, the reaction is finished
how do you increase the number of successful collisions in a reaction
-increase temperature
-increasing concentration
-increase surface area
