Some 8th GRADE Science Questions?

Question

My teacher has given us some problems, and im not so good at it.

These are the last 2 (of 20) that i dont understand.
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One Example of a Physical change is:
a) burning paper
B) baking cookies
C) heating table sugar
D) dissolving salt in water.

One example of a Chemicle Change is:
a) filtering
b)burning wood
c)boiling water
d)crushing a can

Answer 1

Im not going to give you the answer because that would be cheating.

but, a physical change is when something changes, but it could be changed back to its original state by some sort of filtering, evaporating etc.

Chemical change is when something changes and can NOT go back to its original state.

now do your homework boy!
^,^

Answer 2

One Example of a Physical change is:
a) burning paper

One example of a Chemicle Change is:
b)burning wood

Answer 3

I am alsoin 8th grade and had the same problem.
Think about it Physical Change is a change like baking cookies because You do it.Chenmical change means it was changed in nature or something of that sort Chemical change canot be changed back Physical Can.

Answer 4

the physical change is that D dissolving salt in water and believe it or not dissolving is a physcial change

one example of a chemical change is burning wood

Answer 5

in accordance on your approaches area: you're measuring rainfall accumulation, no longer cost, a cost is rainfall accumulation divided through time. Assuming you're measuring a cost... One source of mistakes comes from the device itself. each and each and every rain gauge is percise to a particular volume. And that particular volume is difficulty to human mistakes, no matter if it is a primary contianer with marked off numbers to the aspect. there are a number of of rain gauge, each and each and every with thier professionals and cons in many situations a rain gauge supply ____ readings if = _____ too severe = in case you do not dry the gauge, and extra water is left on the gauge too low = the time it takes to record how a lot water amassed. if too a lot time elapses, you free water through evaprotation.

Answer 6

Physical change : C, sugar melts when you heat it. It is still sugar, but it changed PHYSICALLY

Chemical change: Burning wood, it is no longer wood and its physical properties, now that it is coal or ashes, is completely different. Its molecular structure changed

Answer 7

#1 + a (i think)
#2 = b Because crushing a can is physical, boiling water is just making it hot no physical or chemical. and filtering is physialy spearatng one materials now #! i dunno my hand is hurting asue my dog bit it lol so i dont wanna typetoo muh which is stupid cause im typing this really long scentice about my hand hurting instead of jsut telling you why it is or isnt

Answer 8

D and B
physical changes don't have any chemical reactions or stuff like that

Answer 9

OLA AMIGO, NÃO ENTENDI NADA DO QUE VOCÊ PERGUNTOU, E SEI QUE VOCÊ NÃO VAI ENTENDER NADA DO QUE EU RESPONDI, ENTÃO ESTA 1a1. thanck you ok my friend... the boocks on the table, rsrsrsrsrs.