The ability to rust is not a physical property of matter, but a chemical one, reflecting a substance's capacity to react with oxygen to form a new substance.
In the list provided, the ability to rust is NOT a physical property of matter. Physical properties include traits that can be observed or measured without changing the composition of the material. Examples include melting point, boiling point, odor, and density. The ability to rust, however, is a chemical property as it indicates a substance's ability to react with oxygen to form a new substance, which involves a change in composition.
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Answer:- Law of definite proportions.
Explanations:- The chemical composition of a compound is always constant means it contains the same elements in exactly same proportions by mass. This is called "Law of definite proportions."
Molecular formula of water is . It has two hydrogen atoms and one oxygen atom. Atomic mass of H is 1.008 and that of oxygen atom is 15.999.
Molar mass of water = 2(1.008) + 15.999 = 18.015
mass percentage of H = = 11.2%
mass percentage of O = = 88.8%
These percentages are always fix, no matter from where the sample of water is collected.
Answer:
No we cannot measure absolute energy states.
Explanation:
The absolute energy state means the internal energy of any molecule, either reactant or product. We cannot measure the internal energy of any reactant or product as internal energy or absolute energy is sum of all kind of energy including kinetic energy, vibration energy etc.
However we can measure the changes in these energy during any chemical process.
Answer:
The bars and the gymnast's hands
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Answer:
10 g
Explanation:
Right from the start, just by inspecting the values given, you can say that the answer will be
10 g
.
Now, here's what that is the case.
As you know, a substance's specific heat tells you how much heat is needed to increase the temperature of
1 g
of that substance by
1
∘
C
.
Water has a specific heat of approximately
4.18
J
g
∘
C
. This tells you that in order to increase the temperature of
1 g
of water by
1
∘
C
, you need to provide
4.18 J
of heat.
Now, how much heat would be required to increase the temperature of
1 g
of water by
10
∘
C
?
Well, you'd need
4.18 J
to increase it by
1
∘
C
, another
4.18 J
to increase it by another
1
∘
C
, and so on. This means that you'd need
4.18 J
×
10
=
41.8 J
to increase the temperature of
1 g
of water by
10
∘
C
.
Now look at the value given to you. If you need
41.8 J
to increase the temperature of
1 g
of water by
10
∘
C
, what mass of water would require
10
times as much heat to increase its temperature by
10
∘
C
?
1 g
×
10
=
10 g
And that's your answer.
Mathematically, you can calculate this by using the equation
q
=
m
⋅
c
⋅
Δ
T
, where
q
- heat absorbed/lost
m
- the mass of the sample
c
- the specific heat of the substance
Δ
T
- the change in temperature, defined as final temperature minus initial temperature
Plug in your values to get
418
J
=
m
⋅
4.18
J
g
∘
C
⋅
(
20
−
10
)
∘
C
m
=
418
4.18
⋅
10
=
10 g