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mr Goodwill [35]
3 years ago
13

How does a physical change differ from a chemical change

Chemistry
2 answers:
gtnhenbr [62]3 years ago
7 0
A chemical change is something you can't see and a physical change is something you can see.
inysia [295]3 years ago
6 0

With a physical change you can actually see it change like ice turning into water, then with a chemical change you can't see it change, although within the molecules themselves they change which makes that possible.


Hope this helps!

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What is the volume of 3.5 moles of oxygen gas (O2) at standard temperature and pressure (STP)?
baherus [9]
1 mole ----------- 22.4 L ( at STP )
3.5 mols --------- ?

V  = 3.5 x 22.4 / 1

V = 78.4 L

hope this helps!


4 0
3 years ago
Can someone plz help I also mark braniliest!
NNADVOKAT [17]

Answer:

D. The chemical formula

Explanation:

For example, in the compound KCl, we know that there are two elements present because you can see it in the chemical formula. We know that KCl consists of potassium and chloride ions.  

6 0
2 years ago
Marcus measured the masses and volumes of samples of four different substances, and he calculated their densities. The table sho
Zina [86]

<u>Given:</u>

Calculated density values-

Aluminum = 2.7 g/cm3

Copper = 9.0 g/cm3

Iron = 7.9 g/cm3

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Sample volume = 2.1 cm3

<u>To determine:</u>

The identity of the unknown sample

<u>Explanation:</u>

'Density' is a physical parameter which can be used to identify the nature of the unknown substance.

Density = Mass/Volume

For the unknown sample

Density = 9.5 g/2.1 cm3 = 4.52 g/cm3

This matches closely with the calculated density of titanium

Ans: The unknown substance is made of titanium

4 0
2 years ago
Which molecule has a dipole moment of 0 d?
fiasKO [112]
The answer is 

a symmetrical molecule.


5 0
3 years ago
How many moles are in 395 grams of KMnO4 if the molar mass is 158 g/mole? please help me
Gala2k [10]

Answer:

I have no idea

Explanation:

I don’t know

8 0
2 years ago
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