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Bas_tet [7]
3 years ago
8

I need help with number 3. is the answer 1,2,3,or4

Chemistry
1 answer:
lubasha [3.4K]3 years ago
8 0

Answer:

1 and 4

Explanation:

in both pictures the temperature is cooling down

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H2O2 → H2O + O2
vladimir2022 [97]

Answer:

75.47

Explanation:

AS WE CANT WEIGHT AIR THE ANSWER IS CORRECT

8 0
2 years ago
A cube with edge = 1.00” of an unknown pure substance has a mas off 10.0 oz. what is the density of this substance in g/mL? In k
shepuryov [24]

Answer 1) The density of the cube is found to be 17.30 g/mL

Given the edge that is 1 inch, so to convert it into cc which will be;

1" = 16.38 cc and cc = mL


Convert mass given in oz into g;


10 oz = 283.495 g;


The formula is Mass = Density / Volume


Substituting; 

Density = (283.495 / 16.38) = 17.30 g/mL


Hence, the density will be 17.30 g/mL

Answer 2) The density of cube should be 1.738 Kg/L

The same process of conversion can be followed,

To convert Mass in Kg will be 0.02834 Kg and Volume in L it will be 0.0163 L

On solving with the equation of Mass = Density /  Volume;

Density = (0.02834 / 0.0163) = 1.738 Kg/L

Here, the density will be 1.738 Kg/L

8 0
3 years ago
If a substance can be physically separated into its components, is it a pure substance or a mixture?
Marizza181 [45]
I think its pure substance since you are breaking into its components. For example if you were to break the components of salt apart (NaCl) You will be left with sodium and chloride which are the pure elements of salt. Therefore i believe pure is the best answer.
4 0
3 years ago
Read 2 more answers
As long as a substance ________, it is considered a physical change.
-BARSIC- [3]

Answer:

as long as a substance becomes a new substance it will be considered a physical change

7 0
3 years ago
Barium gives off a green light when it is burned. What does this tell us about the wavelengths of light it emits?
Arlecino [84]
Ultra violet light lemme know when u get it right
5 0
3 years ago
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