anonymous
  • anonymous
How are physical and chemical changes similar? Neither can change the number of atoms of each element that are present. Neither can cause chemical bonds to break. Neither can result in a phase change. Neither can cause a substance to give off heat or light Need help asap. Pleasee help?
Physics
  • Stacey Warren - Expert brainly.com
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
Do you know what physical and chemical change are
anonymous
  • anonymous
Yes
anonymous
  • anonymous
which of the 4 options are not correct

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More answers

anonymous
  • anonymous
The last one
anonymous
  • anonymous
Yep do you know what a phase change is
anonymous
  • anonymous
no
anonymous
  • anonymous
It is the change in the state of matter (state: solid, liquid Gas)
anonymous
  • anonymous
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
anonymous
  • anonymous
Oh so it wouldn't be that one either
anonymous
  • anonymous
yep so not C or D
anonymous
  • anonymous
What is B talking about
anonymous
  • anonymous
im not sure
anonymous
  • anonymous
Chemical bonds are the bonds between two atoms in a molecule
anonymous
  • anonymous
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?
anonymous
  • anonymous
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
anonymous
  • anonymous
Oh ok. Well thank you so much!
anonymous
  • anonymous
Could you help me with another question quick?
anonymous
  • anonymous
sure
anonymous
  • anonymous
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
anonymous
  • anonymous
what is an endothermic reaction
anonymous
  • anonymous
it happens when the system absorbs energy from its surrondings in the form of heat
anonymous
  • anonymous
so it has undergone a chemical reaction in which the products need more energy than they have
anonymous
  • anonymous
C) does it require a phase change?
anonymous
  • anonymous
No?
anonymous
  • anonymous
Have you ever done an experiment where you get an endothermic reaction?
anonymous
  • anonymous
No
anonymous
  • anonymous
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.
anonymous
  • anonymous
Is and exothermic reaction a chemical or physical change
anonymous
  • anonymous
Chemical..
anonymous
  • anonymous
yep, C) is a physical change as we said in the previous question
anonymous
  • anonymous
If you have a look at your definition and the question there is an important word that is in one of the answers
anonymous
  • anonymous
Wait wouldn't it be B?
anonymous
  • anonymous
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
anonymous
  • anonymous
Have a look at A
anonymous
  • anonymous
Oh ok so yeah it would have to be A. Right?
anonymous
  • anonymous
wait no sorry i read it wrong
anonymous
  • anonymous
let me reread
anonymous
  • anonymous
Got it
anonymous
  • anonymous
i mixed up my products and reactants
anonymous
  • anonymous
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
anonymous
  • anonymous
Reactants=>Products Less energy => More energy do you agree this is what A is saying
anonymous
  • anonymous
Yeah
anonymous
  • anonymous
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
anonymous
  • anonymous
So, A
anonymous
  • anonymous
Okay thanks again!
anonymous
  • anonymous
Did it make sense or was it confusing?
anonymous
  • anonymous
It actually makes sense....I find this stuff very confusing but surprisingly can understand it when you explain it.
anonymous
  • anonymous
Good, glad i could help

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