Answer:
2 electrons
8 electrons
8 electrons
1 electron (just count in the rings for these ones)
19 protons (it says "P=19" in the middle. The P stands for Protons)
K (it's from Latin medieval Latin "kalium")
39 (add proton and neutron amounts to get the approximate atomic mass--electrons are negligible)
Explanation:
Answer: Two answers apply to physical change:
1-Condensation of Ethanol
2-Evaporation of Ethanol
Explanation:
Physical and Chemical changes are two very different types of change. However, both processes are possible because of the same thing: the investment of energy.
Physical change requires a lower investment of energy and this is the reason why these kind of changes can be reverted and the molecular structure of the matter does not change.
For example: I can easily change the state of water with fire or a fridge, and go from ice to liquid to vapor and back as many times I want. This is possible because I'm not giving enough energy to break or modify bonding forces inside the molecule of water, but enough energy to modify the interaction between two different molecules of water.
This is why Ethanol can be evaporated and then condensated into liquid again, representing this physical changes.
Chemical change, on the other hand, requires a higher investment of energy and because of this is that the bonds between atoms inside a molecule can be affected (bonds between atoms in the molecule are stronger). Therefore, when the molecules themselves are modified, the matter is transformed from a compound into a new one. This is why glucose becomes carbon dioxide, ethanol or carbon. These three compounds appear when the bonds between Carbons in the glucose are broken.
Answer:
Explanation:
This is an example of back titration.
You add a known excess of HCl to the CaCO₃. Some of it reacts with the CaCO₃.
You titrate the left-over HCl.
From the difference you can calculate the amount of CaCO₃.
100.09
CaCO₃ + 2HCl ⟶ CaCl₂ + H₂CO₃
m/g: 1.2450
V/mL: 65.00
c/mol·L⁻¹: 0.4984
NaOH + HCl ⟶ NaCl + H₂O
V/mL: 37.15
c/mol·L⁻¹: 0.2065
1. Total moles of HCl
2. Excess moles of HCl
3. Moles of HCl that reacted
n = (32.40 - 7.671) mmol HCl = 24.72 mmol HCl
4. Moles of CaCO₃
5. Mass of Ca
Answer: A. aldolase
Explanation:
Phosphofructokinase, is an enzyme which is vital in the regulation of fermentation. It is involved in the glycolysis process.
When it experiences a mutation that was being interfered with the substrate binding, we should note that the enzyme that is going to be most immediately impacted in terms of accessing substrate is aldolase.
Answer:
From least complex to most complex, the answer would be: cell - tissue – organ - system