At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.
Do you know what physical and chemical change are
which of the 4 options are not correct
The last one
Yep do you know what a phase change is
It is the change in the state of matter (state: solid, liquid Gas)
A) Neither can change the number of atoms of each element that are present. B) Neither can cause chemical bonds to break. C) Neither can result in a phase change. D) Neither can cause a substance to give off heat or light
Oh so it wouldn't be that one either
yep so not C or D
What is B talking about
im not sure
Chemical bonds are the bonds between two atoms in a molecule
Oh I would think it can. I may not be right but im pretty sure the number of atoms in each element stay the same. So I think its A?
yep, in a chemical equation the number of atoms on one side has to equal that on the other and if you melt an ice cube all of the water molecules are still there they are just in a puddle
Oh ok. Well thank you so much!
Could you help me with another question quick?
What must be true for any endothermic reaction? A) The chemical bonds of the products have more energy than the chemical bonds of the reactants. B) There are more products than there are reactants. C) There must be a phase change from solid to liquid or from liquid to gas. D) The reaction must take place in a sealed container held at constant volume
what is an endothermic reaction
it happens when the system absorbs energy from its surrondings in the form of heat
so it has undergone a chemical reaction in which the products need more energy than they have
C) does it require a phase change?
Have you ever done an experiment where you get an endothermic reaction?
You mix two chemicals in a test tube and because it require more energy it pulls in heat causing the bottom of the test tube to go cold.
Is and exothermic reaction a chemical or physical change
yep, C) is a physical change as we said in the previous question
If you have a look at your definition and the question there is an important word that is in one of the answers
Wait wouldn't it be B?
In any reaction there the same number of atoms in the products than there are in the reactants. with B) the excess products won't be used in the reaction and will have no effect on the outcome
Have a look at A
Oh ok so yeah it would have to be A. Right?
wait no sorry i read it wrong
let me reread
i mixed up my products and reactants
In any reaction there the same number of atoms in the products than there are in the reactants. with B) the excess products won't exist or there will be more in volume or more smaller molecules, still won't effect
Reactants=>Products Less energy => More energy do you agree this is what A is saying
The products need more energy so they pull is out of their surroundings in the form of heat, causing everything around it to go cold
Okay thanks again!
Did it make sense or was it confusing?
It actually makes sense....I find this stuff very confusing but surprisingly can understand it when you explain it.
Good, glad i could help