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Biology
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A chemist has two solutions of HNO_3. One has a 40% concentration and the other has a 25% concentration. How many liters of each solution must be mixed to obtain 120 L of a 30% solution?
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Science
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Order the colors of the rainbow according to the amount of energy needed to produce them, from lowest to highest.
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Earth and Space Science
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When was The Planetary Society founded?
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Science
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How many seasons are there in a tropical forest?
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Chemistry
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Ammonium phosphate NH43PO4 is an important ingredient in many fertilizers. It can be made by reacting phosphoric acid H3PO4 with ammonia NH3. What mass of ammonium phosphate is produced by the reaction of 9.21g of ammonia? Be sure your answer has the corr
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Science
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Describe the differences in the properties and use of flexible plastics, rigid plastics, fibers and elastomers with stress-strain curves. What type of chemical structures are typical of each?
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Physical Geography
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What is the temperature 32 degrees Fahrenheit in degrees Celsius?
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Physics
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For the solid beam ABC shown in the figure, the brass rod has a cross-section of 30 x 30 mm with Eb = 85 GPa and the copper rod 20 x 20 mm and Ec = 120 GPa . A) Compute the stresses in the bars. B) Assume the stress in brass = 35 MPa, at what maximum di
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Science
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Do Venus flytraps live in the Amazon rainforest?
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Waves
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The frequency of the middle F note on a piano is 349.23 Hz. What is the wavelength of this note in cm? The speed of sound in air is 343.06 m/s.
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Chemistry
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Identify three metallic elements on the periodic table.
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Chemistry
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Magnesium metal is added to 6M hydrochloric acid and reacts according to the following balanced equation: Mg(s) + 2 HCI(aq) rightarrow MgCl_2 (aq) + H_2(g) a. What volume of 1.8 M hydrochloric acid will react with 22.1 grams of Mg? b. What mass of magnes
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Chemistry
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Can you help me with these questions? a) what is the ph of 0.10 M sodium acetate? b)what is the ph of 0.100 M ammonium chloride? c) what is the ph pf 0.10 M ammonium acetate? d) what is the pH of
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Science
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What do parrots eat?
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Science
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What is a catbird?
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Analytical chemistry
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Preparation and standardization of a 1 M NaOH solution Calculate the following before beginning this task: a. The volume of a stock 6 M NaOH solution required to prepare 250 mL of a 1 M NaOH solution.
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Physics
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Cheetahs have a top speed of 120km/h and can accelerate at a constant rate at 9.5m/s^2. How long would it take a cheetah, stalking it’s prey at 4.2m/s, to reach it’s top speed?
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Chemistry
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Assuming you use 2.5 g vanillin and 5.0 mL of a 3.42 M NaBH4 solution, what is the theoretical yield of vanillyl alcohol in moles? in grams? (Hint: you will need to calculate or look up the molar mass
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Science
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Is Anchorage in the Arctic Circle?
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Science
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Are wombats an endangered species?
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Physics
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A thin wall copper tube of radius 5 mm is used to transport refrigerant. Heat is lost to the ambient, which is at a lower temperature. Verify that there is an optimum thickness associated with the app
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Physics
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A clever engineer designs a “sprong” that obeys the force law Fx = -q(x – xe )^3, where xe is the equilibrium position of the end of the sprong and q is the sprong constant. For simplicity well let xe = 0 Then Fx = -qx^3. a) What are the units of q? b) D
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Science
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Are there any waterfalls in the Amazon River?
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Life Science
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Can stress cause a low platelet count?
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Earth and Space Science
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What color is the planet Jupiter?
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Science
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Purification of nickel can be achieved by electrorefining nickel from an impure nickel anode onto a pure nickel cathode in an electrolytic cell. How many hours will it take to plate 20.0 kg of nickel onto the cathode if the current passed through the cell
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Science
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A student attempted to prepare tert-butyl ethyl ether by a substitution reaction between 2-chlro-2methylpropane and sodium ethoxide. None of the desired ether was obtained. What product was formed and why did this route to the ether fail? Suggest a differ
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Chemical reactions
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Mercury and bromine react with each other to produce mercury (II) bromide: Hg + Br_2 arrow HgBr_2 a) What mass of HgBr_2 can be produced from the reaction 10 g Hg and 9 g Br_2 ? b) What mass of
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Science
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Proteins are made up of _________ held together by peptide bonds. a. monomers b. monosaccharides c. polymers d. amino acids
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Periodic table
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Which atom has the larger atomic radius? a) Fr b) F
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Science
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Are koala bears an endangered species?
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Science
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Do flamingos live in the Amazon rainforest?
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Science
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Do whale sharks lay the biggest eggs?
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Science
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Why should a melting point sample be finely powdered?
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Physics
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Convert 600 mm Hg to atm. a. 0.789 atm \ b. 4.24 \times 10^5 atm \ c. 38.0 atm \ d. 18.6 atm \
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Ocean currents
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What is the global conveyor belt?
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Science
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Write the cosmic address of the earth.
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Science
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What is electron shielding?
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Chemistry
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Which of the following is considered to be the most accurate in measuring volume? a. Mohr pipettes. b. Serological pipettes. c. Disposable pipettes. d. Volumetric pipettes.
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Science
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Are lions placental mammals?
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