Answer:
A... According to the periodic table, elements with one electron at the outermost shell or orbital are classified as alkali METALS
The time taken for the water fountain to dispense 842.75 mL of water is 20.625 seconds
<h3 /><h3>What is time?</h3>
Time can be defined as the measure of past, present or future events.
To calculate the time taken to dispense 842.75 mL of water, we use the formula below.
Formula:
- F = V/t................ Equation 1
Where:
- F = Average flow rate of the fountain
- V = Volume of the water
- t = time.
Make t the subject of the equation.
- t = V/F................ Equation 2
From the question,
Given:
- F = 0.64 gallons per minutes
- V = 842.75 mL = (842.75/1000)/(3.78541) gal = 0.22 gal.
Substitute these values into equation 2
- t = 0.22/0.64
- t = 0.34375 minutes.
- t = (0.34375×60) = 20.625 seconds.
Hence, The time taken for the water fountain to dispense 842.75 mL of water, is 20.625 seconds.
Learn more about time here: brainly.com/question/13893070
Sorry so what I think u should do is ask your teach or look up on how to do this problem
Most chemical reactions involve the breaking and formation of chemical bonds. It takes energy to break a chemical bond but energy is released when chemical bonds are formed. If more energy is released than consumed, then the chemical reaction evolves heat and is said to be exothermic.
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The boiling point increase of a solution is a colligative property, which means that it is related with the solvent and the concentration of the solute, as per this formula:
ΔT = i * kb * m
Where, ΔT is the increase in the boiling point, i is the van't Hoof factor (which accounts for the numberof particles that are dissolved), kb is the boiling point and m the molality of the solution.
Gvien the normal boiling point of 100°C for pure water, ΔT = 101.4 °C - 100.0 °C = 1.4 °C.
Kb = 0.512 °C / m
m = 1.2 m
Therefore, i = ΔT / (kb * m) = 1.4°C / (0.512 °C/m * 1.2m) = 2.28
Answer: 2.28