Answer:
. The old camera flash bulb used Mg metal sealed in a bulb with oxygen. At 25°C, the reaction is: Mg(s) + O2(a) → MgOS) AS (J/K.mol): Mg=32.7; O2=205.0; MgO=26.9 AH (kJ/mol: Mg=0; O2=0; MgO=-601.2
Explanation:
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Answer:
3.02
Explanation:
Step 1: Given and required acid
pH of the solution: 4.34
pKa of lactic acid: 3.86
Step 2: Calculate the ratio of the lactate concentration to the lactic acid concentration in this solution
We have a buffer system formed by a weak acid (lactic acid) and its conjugate base (lactate ion). We can find the ratio of the lactate concentration to the lactic acid concentration in this solution using the Henderson-Hasselbach equation.
pH = pKa + log [lactate]/[lactic acid]
4.34 = 3.86 + log [lactate]/[lactic acid]
[lactate]/[lactic acid] = 3.02
I'm not sure about part 1, you may need to google it, but part two is 11 protons, 11 electrons and 12 neutrons. You can find protons and electrons by just looking at the atomic number, and you can find neutrons by subtracting the atomic number from the atomic mass.
Answer:
The Civil Rights Act of 1964 prohibits discrimination on the basis of race, color, religion, sex or national origin. ... The Act prohibited discrimination in public accommodations and federally funded programs. It also strengthened the enforcement of voting rights and the desegregation of schools.
Answer:
The specific heat capacity of sand is less than the water.
Explanation:
On hot days, the beach sand gets hot than water because the specific heat capacity of water is higher than the sand.
Specific heat capacity:
"The amount of heat require to raise the temperature of one gram of substance by one degree"
it mean that water require more heat to raise the temperature while sand get hot by absorbing small amount of temperature.
The specific heat capacity of water is 4200 J Kg-1 °C-1
The specific heat capacity of sand is 840 J Kg-1 °C-1
Equation:
C = Q/ ΔT
Here C is the heat capacity, ΔT is the change of temperature of substance by absorbing heat and Q is the energy in joule.
Another equation:
Q = C× m × ΔT
m is the mass of given substance. The specific heat capacity of water very high than other substances that make a water compound in term of temperature.