1. Eleanor weights 300 N. She walks up a small hill which is 5 meters high. It takes her 4 seconds. How much work did Eleanor do when she climbed the hill? (3 points)Hint: What is the equation used to calculate work? Does time affect the amount of work completed?
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The time does not affect the amount of work.
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Hook was the first to discover cells in a cork. true or false?
Zaccharias Janssen was a scientist who studied properties of light and invented one of the first compound microscopes in the late 1500s. Which property did Janssen most likely believe about light during the time of his invention?a.Light bends around objects. b.Light bounces off surfaces. c.Light travels in a curved path. d.Light is made up of waves.
Both Democritus and Dalton suggested that matter is made up of atoms
You fill a balloon with 2.50 moles of gas at 25°C at a pressure of 1.49 atm. What is the volume of the balloon?
b)gains electrons and gains potential
c)energy gains electrons and loses potential energy
d)loses electrons and gains potential energy
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Answer : The correct option is a) Loses electrons and loses potential energy.
Explanation :
Reducing agent : In a redox reaction, it is oxidized by the loss of electrons and by the loses of potential energy. It is also called as electron donor.
Reducing agent reduces others by loss of electron and its oxidation state increases.
For example : Sodium is a reducing agent and itself oxidized as follows,
Therefore, the molecule that function as a reducing agent in a redox reaction is loses electrons and loses potential energy.
Final answer:
In a redox reaction, the reducing agent loses both electrons and potential energy. This process results in oxidation of the reducing agent as the oxidation state of the reducing agent increases.
Explanation:
Oxidation-Reduction Reaction
In a redox or oxidation-reduction reaction, the molecule acting as the reducing agent (or electron donor) loses electrons and loses potential energy. Hence, the correct option is a). The reducing agent donates electrons to another substance or molecule and, in this process, is itself oxidized. The oxidation state of the reducing agent increases. The reduction process involves a gain of electrons, but this gain happens to the substance that receives the electrons, not the one who donates them (the reducing agent).
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Percent solution of NaCl = 3.26%
Step 1: Determine the mass of NaCl in the initial solution
The initial solution is 25% NaCl, which means there are 25 grams of NaCl for every 100 grams of solution. To find the mass of NaCl in the 75g solution, use this proportion:
(25g NaCl / 100g solution) = (x / 75g solution)
Solve for x:
x = (25g NaCl * 75g solution) / 100g solution
x = 18.75g NaCl
Step 2: Determine the total mass of the diluted solution
Add the mass of water (500g) to the mass of the initial solution (75g):
Total mass = 500g water + 75g solution = 575g diluted solution
Step 3: Calculate the percentage of NaCl in the diluted solution
Use the mass of NaCl from Step 1 and the total mass of the diluted solution from Step 2 to find the percentage by mass:
Percentage = (Mass of NaCl / Total mass of diluted solution) * 100
Percentage = (18.75g NaCl / 575g diluted solution) * 100
Percentage ≈ 3.26%
The percent solution by mass of NaCl in the diluted solution is approximately 3.26%.
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D. Stratum Corneum
The layer of the epidermis that contains flat, dead cells filled with keratin and surrounded by lipids is (d) Stratum Corneum. This layer is the outermost layer of the epidermis and serves as a protective barrier for the skin, preventing the loss of water and protecting against external pathogens and environmental factors. The accumulation of keratin and lipids in the stratum corneum gives it its characteristic properties.