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hodyreva [135]
3 years ago
14

What moon phase comes before the 3rd quarter?

Chemistry
1 answer:
olga_2 [115]3 years ago
6 0
Answer: Waning Gibbous
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Which color of visible light has the shortest wavelength?
Otrada [13]

Answer:

Hi! Your answer should be (C.) violet

Explanation:

Violet had the shortest wavelength, at around 380 nanometers. Red has the longest wavelength, at around 700 nanometers. Hope this helps!

8 0
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Jaime is learning how elements are placed in the periodic table. He must find an element similar
Inessa05 [86]

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Both are in group 2 and because of that share the same chemical properties.

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3 years ago
What is ΔE in kJ for a system that receives 1.79 kJ of heat from surroundings and has 4.51 kcal of work done on it at the same t
kenny6666 [7]

Answer: 20.7 kJ

Explanation:

According to first law of thermodynamics:

\Delta E=q+w

\Delta E=Change in internal energy

q = heat absorbed or released

w = work done or by the system

w = work done on the system=-P\Delta V  {Work is done on the system is positive as the final volume is lesser than initial volume}

w = 4.51 kcal = 4.51\times 4.184kJ=18.9kJ    (1kcal = 4.184kJ)

q = +1.79 kJ   {Heat absorbed by the system is positive}

\Delta E=+1.79+(18.9)=20.7kJ

Thus \Delta E for a system that receives 1.79 kJ of heat from surroundings and has 4.51 kcal of work done on it at the same time is 20.7 kJ

4 0
3 years ago
What are questions 5 & 6?
aev [14]

Answer:

5. A strong base increases the OH- ion concentration in an aqueous solution.

6. It has more hydrogen ions.

Explanation:

5. Arrhenius theory states that acids donate H+ ions to a solution and bases donate OH- ions to a solution.

6. pH < 7 so the solution is acidic. Acidic solutions have more hydrogen or hydronium ions. Hydrogen and hydronium ions are essentially interchangeable.

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Forward reaction equals the rate of the backward reaction
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