Chemistry

Why the bond in water molecule os polar covalent bond, while than in chlorine molecule is pure covalent bond? Give reason?
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How do human change the Earth's surface?Human activities such as overpopulation can change the Earth's surface.Human activities such as driving cars can change the Earth's surface.Human activities such as mining and deforestation can change the Earth's surface.Human activities such as poaching can change the Earth's surface.
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Why can more sugar be dissolved in hot water than cold water (more solute be dissolved in hot solvent then cold solvent)
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From where do the placenta and umbilical cord develop? outer cells of the blastocystinner cells of the blastocystdirectly from the uterusdirectly from the ovary
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Which pH values indicate an acid soil?
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(Help would be greatly appreciated, chemistry is not my strong suit) How many moles of NaCl are present in a solution with a molarity of 8.59M and 125mL of a solution?1. 1.07g 2. 62.7mol3. 1.07mol4. 62.7g
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How do you figure out the final temperature or the initial temperature in calorimetry.
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A velocity-time graph shows how what changes over time?
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True or false, the torch that is carried to the Olympic cauldron to be lit, is ignited by a match
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Brainliest to right answer
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Sulfur dioxide and oxygen react to form sulfur trioxide during one of the key steps in sulfuric acid synthesis. An industrial chemist studying this reaction fills a flask with of sulfur dioxide gas and of oxygen gas, and when the mixture has come to equilibrium measures the partial pressure of sulfur trioxide gas to be . Calculate the pressure equilibrium constant for the reaction of sulfur dioxide and oxygen at the final temperature of the mixture. Round your answer to significant digits.
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Lets be honest here no one would help me with these 3-4 questions but anyways
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Help-The question is down below
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To investigate the effect of salt water on a cell, a researcher places one cell sample in freshwater and a second cell sample in salt water. After six hours, the researcher observes and sketches the two cells as shown. What change in the cells occurred during the six hours the cells remained undisturbed? A.Osmosis occurred in the salt water cell sample because the water from inside the cell moved out of the cell to a lower concentration, causing the cell to shrink. B.Osmosis occurred in the freshwater cell sample because the water from outside the cell moved into the cell to a higher concentration, causing the cell to grow. C.Osmosis occurred in the salt water cell sample because the salt from outside the cell moved into the cell to a lower concentration, causing the cell to shrink. D.Osmosis occurred in the freshwater cell sample because the salt from inside the cell moved out of the cell to a higher concentration, causing the cell to grow.
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What is the gravitational force on a 35.0kg object standing on the earth's surface ?
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Single-celled organisms need a microscope to be seen...O TrueO False
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Summarize how a dinosaur can become a fossil.
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Which of the following explains why a longer bond is also a weaker bond? Help plz
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Difference between Solute and solvet
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how many moles of nitrogen gas are produced in the reaction if we started with 6 moles of ammonium nitrate
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Which gases in the following list exist as separate atoms: hydrogen, helium, nitrogen, oxygen, neon.Select one:a. Hydrogen and heliumb. Helium and nitrogenc. Helium and neond. Oxygen and nitrogen
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The human body can get energy by metabolizing proteins, carbohydrates or fatty acids, depending on the circumstances. Roughly speaking, the energy it gets comes mostly from allowing all the carbon atoms in the food molecules to become oxidized to carbon dioxide CO2 by reaction with oxygen from the atmosphere. Hence the energy content of food is roughly proportional to the carbon content.Let's consider alanine, C3H7NO2, one of the amino acids from which proteins are made, and glucose C6H12O6, one of the simplest carbohydrates. Using the idea above about energy content, calculate the ratio of the energy the body gets metabolizing each gram of alanine to the energy the body gets metabolizing each gram of glucose.
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What is an equilibrium constant? A. A constant relating the effects of activation energy and temperature on the reaction rate B. The value of the rate of the forward and reverse reactions at equilibrium C. The amount of energy required for the collision of two molecules to result in a reaction D. The ratio of equilibrium concentrations of products to concentrations of reactants
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Solid aluminum metal reacts with chlorine gas to produce aluminum chloride crystals. How many grams ofaluminum chloride will be produced if the reaction begins with 135.0 g Al and 75.0 g chlorine gas? Write the balanced equation. Determine the limiting reactant and determine how much excess reactant will be left over. show your work.
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