a mixture of natural gas and air does not react appreciably at room temperature when a piece of platinum is

atinum is inserted into the reaction vessel, however, the mixture explodes. Explain.

here are 2.00 mol of Gas A in the mixture, how many moles of Gas B are present? (R = 0.0821 L • atm/(K • mol)) (b) The gas in a 250. mL piston experiences a change in pressure from 1.00 atm to 2.80 atm. What is the new volume (in mL) assuming the moles of gas and temperature are held constant? (c) Small quantities of Oxygen can be produced by the decomposition of mercury(II) oxide as shown below. Typically, the oxygen gas is bubbled through water for collection and becomes saturated with water vapor. Atomic weight of HgO = 216.6 amu, Atomic weight of Oxygen = 32.00 amu) 2 HgO(s) → 2 Hg(ℓ) + O₂(g) (i) Assuming that 3.05 grams of HgO was used in this reaction, determine the number of moles of oxygen gas formed.(According to the above chemical equation) (ii) Assuming 310. 0 mL of Oxygen gas was collected at at 29°C, calculate the pressure of the Oxygen gas that was collected. (R = 0.0821 L • atm/(K • mol) (iii) If the vapor pressure of water at this temperature equals to 0.042 atm, calculate the pressure reading of this experiment.

Not you? Switch account * Required Write your FIRST name: * Write your LAST name: * 1. Which best describes the difference between single cell and multicellular organisms? * 1 point a. Single-cell organisms can perform all processes in one cell, but multicellular organisms need many cells to do specialized functions together. b. Single-cell organisms need one cell to function, but multicellular organisms need lots of cells who all have the same job. c. Single-cell organisms need many cells to do specialized functions together, but multicellular organisms can perform all processes in one cell. d. Single-cell organisms need multiple cells with similar structures, but multicellular organisms need only one cell. 2. How does your brain move your arm? * 1 point a. The brain sends a message to your bones to move your arm b. The brain sends a message to your nerves to move your arm c. The lungs send a message to your muscles d. The muscles send a message to your brain 3. Which correctly explains the difference between the respiratory and circulatory system? * 1 point a. The respiratory system includes your lungs and the circulatory system includes your heart b. The respiratory system takes in oxygen and the circulatory system breaks down food c. The respiratory system takes in water and carbon dioxide, but the circulatory system does not d. The respiratory system includes the brain and the circulatory system includes to lungs 4. Which of the following is a learned behavior? * 1 point a. Dimples when you smile b. Ability to sing c. Freckles d. Hair color 5. These are all examples of: * 1 point Captionless Image a. Evaporation b. Radiation c. Transpiration d. Percipitation 6. Which of these does NOT make a new material? * 1 point a. Burning a wooden log b. Iron nail rusitng c. Ice melting d. Mysterious color change Explain why: * This is a required question 7. What would you want to put your drink it to keep it cold? * 1 point Metal (good conductor) Plastic (bad conductor) Explain why: * 8. How does the sun play a role in the water cycle? * 1 point a. Heats water and turns it into water vapor gas b. Cools gas to make water droplets and clouds c. Creates strong winds d. Causing it to rain 9. What will happen when a metal chair is left outside in the hot sun? * 1 point a. Increase in weight b. Decrease in weight c. Increase in size d. Decrease in size 10. What would the weight of the lemonade be if the water is 3.0 grams, the ice is 2.5 grams, and the mixture is 0.25 grams? * 1 point a. 5.75 g b. 5 g c. 6.25 g d. 10.1 g

ve 2 times as many kilograms of peanuts as of sunflower seeds. -Peanuts cost $15/kg and sunflower seeds cost $8/kg. -Boris has $152 to spend. If you let x=kilograms of peanuts andy=kilograms of sunflower seeds, write a system of equations with elimination that could be used to solve Boris' problem.

fill a 55-gallon drum with a 20% winter mixture of antifreeze for his customers. Dennis wants to mix 100% antifreeze with a 10% antifreeze mix to get the 20% mixture. How many gallons of 100% antifreeze and 10% antifreeze does he need in order to fill the drum?

egar, and the second brand contains 14% vinegar. The chef wants to make 310 milliliters of a dressing that is 12% vinegar. How much of each brand should she use?

ertilizer. How much of the mixture should be drained and replaced by an equal amount of water to dilute the mixture to 10% fertilizer? ___L of the 25% mixture should be drained and replaced by water. 2. Darren drives to school in rush hour traffic and averages 24mph. He returns home in mid-afternoon when there is less traffic and averages 39mph. What is the distance between his home and school if the total traveling time is 1hr 45min? The distance between his home and school is ___ mi.

e - Organs - Organ systems - organisms - species ...etc... I also understand the chart for Matter being separated by either minute or substance a mixture of which can only either be homogeneous or heterogeneous and substances are either elements or compounds .... what I don't understand is where elements fit into the levels of biological organization and also ... if a compound is two or more elements then why is it a separate category under substances

ric acid. Titration of 11.3 mL X with 0.119 M silver nitrate required 78.2 mL of the latter. The resulting precipitate, containing a mixture of Ag2CrO4 and AgCl, was dried and found to weigh 1.420 g. How much 0.142 M sodium hydroxide should be used to neutralize 11.3 mL solution X?

acid. Titration of 13.6 mL X with 0.139 M silver nitrate required 40.7 mL of the latter. The resulting precipitate, containing a mixture of AgBr and AgI, was dried and found to weigh 1.260 g. How much 0.117 M sodium hydroxide should be used to neutralize 13.6 mL solution X?