To determine the charge of the iron, you must know the charge from the oxygen. An oxygen ion has a -2 charge. Therefore, 3 oxygen ions have -6 charge. We know that charges must cancel out. If it were Fe+2 in the compound, the overall charge would be -2, which isn’t correct. So, we can conclude that it is Fe+3 found in iron (III) oxide.
-25.116 Kilojoules are given off when 120 grams of water are cooled from 25°C to -25°C.
Explanation:
GIVEN THAT:
mass of water = 120 grams OR 0.12 Kg
initial temperature = 25 degrees
final temperature = -25degrees
change in temperature (ΔT) = final temperature - initial temperature
-25 -25
= -50 degrees
specific heat capacity of water = 4.186 joule/gram degree Celsius
Q (heat energy transferred) = ?
Formula used,
Q = mcΔT
Putting the values in equation
Q = 120 X 4.186 X -50
= -25116 joules
The energy in joules is converted to kilo joule by dividing it with 1000.
The negative sign in the energy transfer shows that energy is released in the process.
Answer:
Bind to the protein complex troponin.
Explanation:
Excitation of skeletal muscle caused by the calcium ions. During excitation of skeletal muscle, after calcium ions released into the cytosol, they bind to the protein complex known as troponin and causing substitutions in the protein complex.
These alterations permit protein to push out from the myosin-binding sites on the actin filament.
Answer:
1) Increases
2) decreases
3) increases
4) decreases
Explanation:
When the intermolecular forces in a liquid increases, the greater vapour pressure of the liquid decreases accordingly.
Since the vapour pressure is proportional to temperature, as temperature increases, the vapour pressure increases alongside.
As intermolecular forces increases, the boiling point increases accordingly since more energy is required to break intermolecular bonds.
Lastly, the greater the surface area, tell greater the vapour pressure since more liquid surface area is now available.
