Answer:
Chemically combined and cannot be separated
Explanation:
1)A minimum of two atoms combine to form a molecule.
2)Atoms are combined via chemical reactions thus chemically combined. Sodium+Chlorine
e.g Na+Cl—>NaCl²
Q = m . C . Δ T
q : Heat absorbed
m : mass of the sample
C : The specific heat of the substance.
Δ T : The change in temperature (Final T - initial T)
So:
q = 15.5 x 4.18 x (50 - 25) = 1619.75 J
Answer:
It is true
Explanation:
Remember that energy can not be created or destroy, it will only change depending the conditions that suffer an object.
In this explanation, a rubber that is still, it has inside it some energy stored, the one that it is called potential, and could be transformed in another kind of energy when is necessary like when the toothpick spin, is because this potential energy can be changed into mechanical energy to move the toothpick and make it spin, changing the potential energy into mechanical.
Hope this info is useful.
Neutral pH means a pH of 7, yes? Recall that 'pH' means the POWER of Hydrogen. You should be familiar with the equation : pH = -log[H+].
In this case, 7 = log[H+].
Mathematically rearranged, this means that to find H+ concentration,
[H+] = 10 ^-pH.
In this case, [H+] = 10 ^-7.
I am assuming this is conducted at a standard 25 degrees. The auto-dissociation formula of water is this: Kw = [H3O+] x [OH-] at 25 degrees.
The concentration of Hydronium is the same as the concentration of hydrogen, 10 ^-7. mol/L.
There's your answer!
The matter that has the same composition and properties throughout is called pure chemical substance. So the answer is substance.
