Chemistry

Air is classified as a mixture. What statement must be true about air? (4D) a.) Air has a composition that is always the same mixture of elements and compounds. b.) Air is made up of atoms of several different elements that are chemically combined. c.) Air is made up of atoms of one element. d.) Air is two or more elements or compounds that are not chemically combined.
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What is the molarity of a NaOH solution when 22.14 mL of 0.105 M oxalic acid is needed toneutralize 25.0 mL of the base.
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Consider the following system at equilibrium. CaCO3(s) Double headed arrow. Ca2 (aq) CO32""(aq) The addition of which compound will cause a shift in equilibrium because of a common ion effect? CCl4 CO2 CuSO4 Na2CO3.
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The gas in a 250. mL piston experiences a change in pressure from 1.00 atm to 2.25 atm. What is the new volume (in mL) assuming the moles of gas and temperature are held constant?
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PLEASE HELP 100 POINTSidentify the type of chemical reaction:C6H12 + 9 O2 ---> 6 CO2 + 2 H2O
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What is the formula for this compound?1 atom of copper, 1 atom of sulfur, 4 atoms of oxygen
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Which environment will probably have the lowest relative humidity?A) A tropical rain forestincorrect answerB) A desertincorrect answerC) Farmlandincorrect answerD) A swampincorrect answerReally need this quick i will give 20 pnts
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describe the atomic models above in terms of a. location of nucleusb.location of electrons
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To balance a redox reaction, what must be done?The ion charge on both sides of the equation must equal zero.Water must be added to both sides of the equation.The increase and decrease in oxidation numbers must be balanced.H+ and OH must be added to opposite sides of the equation.
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How many aluminum atoms are in 4.18 g of aluminum?
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Which statement describes why sodium reacts more vigorously than magnesium to hydrochloric acid? Refer to the periodic table. Circle the letter of the correct answer. 1) Sodium has a smaller atomic radius than magnesium.2)Sodium has a lower ionization energy than magnesium.3)Magnesium has a lower ionization energy than sodium.
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Help! Its due in 1 minute
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is a physiologist. Which would most likely be the main focus of her studies?how atoms bond to form different kinds of matterhow subatomic particles interact and make up atomshow certain molecules affect the function of the human hearthow the structure of the human brain may differ between humans
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Give reason. When the tip of a plant is cut, it does not grow tall.
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How did the Heisenberg uncertainty principle contribute to the idea that electrons occupy clouds," or "orbitals?
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The magnetic field of an object exerts a force on any magnetic object around it.True orFalse
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I need help, ACTUAL ANSWERS PLEASE
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Which statement about states of matter is correct? (1 point)O If you add enough heat to a gas, it will change into a liquidIf you cool a solid enough, it will change into a liquidIf you add enough heat to a solid it will change into a liquid.o If you cool a liquid enough, it will change into a gas
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How does lemon juice stop an apple from turning brown?
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What is the melting point of water ? what is the freezing point of water?
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Which liquid has more density
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What is the job of cellular respiration?
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The decomposition of ethanol (C2H5OH) on an alumina (Al2O3) surface C2H5OH1 g2 h C2H4 1 g2 1 H2O1 g2 was studied at 600 K. Concentration versus time data were col- lected for this reaction, and a plot of [A] versus time resulted in a straight line with a slope of 24.00 3 1025 mol/L s. a. Determine the rate law, the integrated rate law, and the value of the rate constant for this reaction. b. If the initial concentration of C2H5OH was 1.25 3 1022 M, calculate the half-life for this reaction. c. How much time is required for all the 1.25 3 1022 M C2H5OH to decompose?
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Which of the following is a completely elastic collision? A. a ball rebounds against a wall, reversing its direction, but at only half the speed. B. Two balls collide, stick to each other, and move together after the collision. C. Two balls collide and move at a right angle to each other after the collision at a reduced speed. D. Two balls collide head on, each reversing its direction and traveling at half the speed. E. A ball with velocity v collides with a ball at rest; after the collision the first ball is at rest and the second ball has velocity v. I will mark brainliest
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