Answer:
D im pretty sure cuz i prob had this test already
Explanation:
They're only found in the nucleus and play an important role in keeping the atom stable because they carry a negative charge to counteract the proton's positive charge.
Answer:
Answer A
Explanation:
2 H2 + O2 = 2 H2O
knowing the mole weights of these elements shows O2 is the limiting reactant in this situation.
4 g oxygen is 4 /31.998 = .125 mole O2
We should get two times these moles of water = .250 moles
weight = .250 (1.008 * 2 + 15.999) = 4.50 gm H20 (theoretical)
....but we only got 4 gm
4/4.50 = 88.8%
Entropy change of vaporization is simply the ratio of
enthalpy change and the temperature in Kelvin.
Temperature = 64 + 273.15 = 337.15 K
Hence,
δsvap = (32.21 kJ / mole) / 337.15 K
<span>δsvap = 0.0955 kJ / mole K = 95.5 J / mole K</span>
Answer:
Sodium ions - Na⁺ - cation
Potassium ions - K⁺ cation
Chloride ions - Cl⁻ anion
Magnesium ions - Mg²⁺ cation
Calcium ions - Ca²⁺ cation
Phosphate ions - P³⁻ anion
Iron ions - Fe²⁺ cation
Zinc ions - Zn⁺ cation
Explanation:
Following is a list of 8 common but essential ions in the cells and fluids of human bodies:
1. Sodium ions helps in regulation and control the level of body fluids
2. Potassium ions help regulate cellular functions
3. Calcium ions are essential for building and maintaining strength bones and teeth. and have role in blood clotting, muscle contraction, and the transmission of nerve signals to cells.
4. Chloride ions are the main anions found outside body cells. They acts as counterions
5. Magnesium ions present in the bones
6. Phosphate ions present in body fluids act as the counterions.
7. Iron
8. Zinc