The standard kilogram used to be a platinum iridium cylinder 39.0 mm in height and 39.0 mm in diameter. What is the density of the material?

In a combustion reaction, 39.5 g of hydrocarbon reacts with 96.0 g of oxygen to produce water and carbon dioxide. If 57.6 g of water is produced, how much carbon dioxide is produced?

a pilot flies 40 km is the direction 60 degrees north of east

a beach ball is volleyed up from a height 2.1m above ground up to a height of 13m. Find out as many unknown physical variables about the initial conditions and 2.5s later

What distinguishes archaea from bacteria ?

What distinguishes archaea from bacteria ?

Which part of an amphipathic lipid is the hydrophobic part?

At 25 °C, 0.0560 mol O2 and 0.020 mol N2O were placed in a 1.00 L container where the following equilibrium was then established. 2N2O(g) + 3O2(g) 4NO2(g) At equilibrium, the NO2 concentration was 0.020 M. Calculate the value of ?G° for the reaction.

Estimate how many hours it would take to run ( at 10km/h ) across the Philippines from batanes to jolo. Assuming that inter-island bridges are in place and jolo is about 3000 km away from batanea

Three children, each of weight 386 N, make a log raft by lashing together logs of diameter 0.43 m and length 2.12 m. How many logs will be needed to keep them afloat in fresh water? Take the density of the logs to be 800 kg/m3.

If you see the first-quarter Moon on the meridian, the Sun must be

How many chlorine atoms are in 23 molecules of phosphorus pentachloride, PCl??

Find the number of oscillations the amplitude drops to half of its initial value. k=30 N/m, m=170 kg, b=2 Ns/m, n=?

Solve the Linear Programming question using Graphical method A dietician has learned from a nutritional book that his family needs at least 300 grams of protein and at least 60 milligrams iron per day for sound health. These nutrients can be obtained from meat and vegetable products. Each kilogram of meat costs an average of $90 and contains an average of 150 grams of protein and 15 milligrams of iron, while each kilogram of vegetables costs $22.50 and has 10 grams of protein and 5 milligrams of iron. He wants to determine the quantities of food that meet the nutritional requirements at least cost.

You have a 5.0 ml sample of a protein in 0.5M NaCl. You place the protein/salt sample inside dialysis tubing and place the bag in a large beaker of distilled water. Your goal is to remove as much NaCl from the sample as possible. Since you know that the final salt concentration will be the same inside the tubing as out, you can calculate the final concentration of the salt. a) If you decide to place the dialysis bag in 4.0 L of distilled water for 12 h the final concentration of the salt would be _______*1 mM. b) What would the final salt concentration be if instead of placing the dialysis bag in 4.0 L of distilled water for 12 h, you placed the bag in 1.0 L of distilled water for 6.0 h and then in another 1.0 L of fresh distilled water for another 6.0 h? It would be _______*1 mM.

A student bought a smartwatch that tracks the number of steps she walks throughout the day. The table shows the number of steps recorded t minutes after 3:00 p.m. on the first day she wore the watch. t (min) 0 10 20 30 40 Steps 3,288 4,659 5,522 6,686 7,128 (a) Find the slopes of the secant lines corresponding to the given intervals of t. (i) [0, 40] (ii) [10, 20] (iii) [20, 30] (b) Estimate the student's walking pace, in steps per minute, at 3:20 p.m. by averaging the slopes of two secant lines from part (a). (Round your answer to the nearest integer.) steps per minute

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1. Osmium has a density of 22.6 g/cm3. What volume (in cm3) would be occupied by a 21.8 g sample of osmium? (Round your answer to the correct number of significant figures. Enter only your numerical answer below. Do not enter the units.) 2. How many grams are in 1.48 × 10^7 µg? (Round your answer to the correct number of significant figures. Enter only the numerical answer below. Do not enter the units.)

1. Endocytosis is a type of _______. A. passive transport B. facilitated diffusion C. active transport D. osmosis 2.Fill in the blank with the correct answer by typing in the box. A(n) ______ microscope allows biologists to see a cell’s distinct internal structures. 3.Which of the following is a shared characteristic of prokaryotic and eukaryotic organisms? A capsule B pili C nucleoid D ribosomes 4.Select whether the statement is true or false. Endocytosis is the process by which a cell expels material into the extracellular fluid. A true B false 5.A cell engulfing dissolved particles in extracellular fluid would be an example of which of the following? A pinocytosis B phagocytosis C receptor-mediated endocytosis D exocytosis 6.Fill in the blank with the correct answer by typing in the box. If the fluid outside the cell has the _____ concentration of solutes inside the cell, we say that fluid is isotonic. 7.Select whether the statement is true or false. The electrical gradient across the plasma membrane is caused by ATP moving into and out of cells. A true B false 8. During osmosis, water will move from a ____concentration of water to a ___ concentration of water. A low; high B high; equilibrium C high; low D low; equilibrium 9. Select whether the statement is true or false. Both eukaryotic cells and prokaryotic cells have a plasma membrane. A true B false 10. Which of the following can be found in an animal cell, but not a plant cell? A centrosomes B DNA C ribosomes D mitochondria 11. Which of the following is a component to the unified cell theory? A. All prokaryotes are made up of more than one cell. B All living things are made up by one or more cells. C All matter is made up of cells. D All cells are made up of matter. 12. Which of the following is important in microscopy? A lens length B base height C magnification D number of adjustment knobs 13. Fill in the blank with the correct answer by typing in the box. When determining whether a cell is a prokaryote or a eukaryote, you should look for the presence of a _______. 14. Which of the following can describe the phospholipid bilayer? A fluid mosaic B a homogenous solution C homogenous mosaic D a heterogenous solution 15. Which of the following would a prokaryotic organism contain? A nucleus B pili C smooth ER D lysosome 16. Receptors on the plasma membrane do all the following except _______. A interact with neurotransmitters B act as transport proteins C create changes in the interior of the cell D interact with hormones 17. What happens to a cell that is placed in an isotonic solution? A The cell swells. B The cell stays the same size. C The cell will crenate. D The cell shrinks. 18. Solutes move from a ____concentration to a ____ concentration during active transport. A low; equilibrium B low; high C high; low D high; equilibrium 19. Select whether the statement is true or false. Dissecting microscopes are designed to have a magnified and clear view of tissue structure as well as the anatomy of the whole organism. A true B false 20. Click an item in one column, then select its match in the other column. If using a keyboard, use the tab key to highlight an item, then use the space bar to select it. Match the organelle with its function. You must provide all correct answers in order to receive credit; partial credit is not allowed. Mitochondrion Lysosome Chloroplast Central vacuole Golgi apparatus Peroxisome Nucleus Directs the synthesis of ribosomes and proteins Acts as a storage compartment in plant cells Functions as a digestive component in animal cells Carries out photosynthesis Sorts, tags, and packages lipids and proteins for distribution Oxidizes fatty acids and amino acids, also detoxifies many poisons Carries out cellular respiration. 21. What do osmosis and diffusion have in common? A Both process uses ATP as their energy source. B They have nothing in common. C Neither use energy. D Both use glucose as their energy source. 22. Why is it important that the glycerol heads of the cell membrane be facing toward the extracellular and intracellular environment? A They have both hydrophilic and hydrophobic properties. B They are hydrophilic. C They are hydrophobic. D They have neither hydrophilic or hydrophobic properties. 23. Which of the following statements describes why active transport is different from passive transport? A Passive transport requires energy, while active transport does not. B Passive transport occurs during the day, while active transport does not. C Active transport requires energy, while passive transport does not. D Passive transport requires the use of a transport protein, while active transport does not. 24. Which of the following is associated with a prokaryote? A nucleoid B rough ER C peroxisomes D Golgi body 25. Certain proteins can assist in moving a material from an area of high concent. A True B False 26.Which of the following is made during a secondary active transport process in the mitochondrion? A oxygen B ATP C glucose D carbon dioxide 27. What kinds of solutes move straight through the plasma membrane easily and unassisted? A small nonpolar molecules B small polar molecules C ions D large polar molecules 28. A cell contains 30% solute, while the external environment contains 10% solute. What kind of solution is this cell sitting in? A hypertonic B osmotonic C isotonic D hypotonic 29. Fill in the blank with the correct answer by typing in the box. Vitamins such as A, D, E, and K can easily pass through the _____ part of the plasma membrane because they are fat soluble. 30. Select whether the statement is true or false. Only the inside of the plasma membrane is hydrophilic. A true B false 31. Which type of a microscope uses a beam of electrons that moves back and forth across a cell’s surface thereby reflecting the details of the cell to the user? A transmission electron B scanning electron C light D dissecting 32. During the process of diffusion, solutes move ________ their concentration gradient. A up B the solutes do not move during diffusion C down D across 33. Select whether the statement is true or false. Carbohydrates found on the exterior surface of cells regulate fluidity of the membrane and change based on the temperature of the cell's environment. A true B false 34. Select whether the statement is true or false. If a cell is in a hypotonic solution, too much water could enter the cell and cause it to burst. A true B false 35. Which of the following is a shared component of plant and animal cells? A cell wall B plastids C ribosomes D chloroplasts 36. Select whether the statement is true or false. Peroxisomes are abundant in immature red blood cells for the synthesis of hemoglobin. A true B false 37. A white blood cell engulfing a bacterial cell would be an example of which of the following? A receptor-mediated endocytosis B pinocytosis C exocytosis D phagocytosis 38. Which of the following is the main component of the plasma membrane? A phospholipids B carbohydrates C proteins D cholesterol 39. Fill in the blank with the correct answer by typing in the box. The plasma membrane of a cell has two layers of _______ molecules, which help to regulate body temperature in animals. 40. A cell contains 10% solute, while the external environment contains 20% solute. What kind of solution is this cell sitting in? A hypertonic B isotonic C osmotonic D hypotonic 41. Fill in the blank with the correct answer by typing in the box. Only _____ can be transported through a membrane during osmosis. 42. Glycoproteins and glycolipids perform what function on the surface of a plasma membrane? A cell-cell recognition B part of the cytoskeleton C act as enzymes D Glycoproteins and glycolipids do not live on the surface of the plasma membrane. 43. Fill in the blank with the correct answer by typing in the box. There are ____ ways in which particles can move actively into a cell. 44. Fill in the blank with the correct answer by typing in the box. The electrical gradient of _____ promotes the diffusion of the ion into the cell, but it promotes the concentration gradient of that ion out of the cell. 45. Fill in the blank with the correct answer by typing in the box. There are _____ types of fibers within the cytoskeleton of a cell.

1- how to know what type of bond is in any compound such as NaCl and HCl? i know if it was ionic or metallic or covalent, but what i want to know is how to specify if it was secondary bond ( Van her wall) or mixed or slightly mixed, such as the following question-> What type(s) of bonding would be expected for each of the following materials: solid xenon, calcium fluoride (CaF2), bronze, cadmium telluride (CdTe), rubber, and tungsten? Solution: For solid xenon, the bonding is van der Waals since xenon is an inert gas. For CaF2, the bonding is predominantly ionic (but with some slight covalent character) on the basis of the relative positions of Ca and F in the periodic table. For bronze, the bonding is metallic since it is a metal alloy (composed of copper and tin). For CdTe, the bonding is predominantly covalent (with some slight ionic character) on the basis of the relative positions of Cd and Te in the periodic table. For rubber, the bonding is covalent with some van der Waals. (Rubber is composed primarily of carbon and hydrogen atoms.) For tungsten, the bonding is metallic since it is a metallic element from the periodic table The thing is i do not know how to answer the above question that's why I want an explanation of how to determine any types of bonding and how do i figure that it has mixed bond...etc) Thank you!

A body of mass 3 kg is projected vertically upward with an initial velocity 30 meters per second. We assume that the forces acting on the body are the force of gravity and a retarding force of air resistance with direction opposite to the direction of motion and with magnitude k|v(t)| where k is a positive constant and v(t) is the velocity of the ball at time t. The gravitational constant is g=9.8m/s2. a) Find a differential equation for the velocity v (in terms of k): v′(t)= b) Solve the differential equation in part a) and find a formula for the velocity at any time ( in terms of k ): v(t)= Find the limit of this velocity for a fixed time t0 as the air resistance coefficient k goes to 0. (Enter t_0 as t0 .) v(t0)= How does this compare with the solution to the equation for velocity when there is no air resistance? This illustrates an important fact, related to the fundamental theorem of ODE and called 'continuous dependence' on parameters and initial conditions. What this means is that, for a fixed time, changing the initial conditions slightly, or changing the parameters slightly, only slightly changes the value at time t. The fact that the terminal time t under consideration is a fixed, finite number is important. If you consider 'infinite' t, or the 'final' result you may get very different answers. Consider for example a solution to y′=y, whose initial condition is essentially zero, but which might vary a bit positive or negative. If the initial condition is positive the "final" result is plus infinity, but if the initial condition is negative the final condition is negative infinity.

The following is the correct descending order of density for different materials: Polymers, Metals, Ceramics Polymers, Ceramics, Metals Composites, polymers, ceramics Composites, Metals, ceramics, polymers Metals, Composites, polymers, ceramics None of the above

Each of five persons Neena, Latha, Jaya, Reena and Molly is the owner of a field in a different country among S through W. Each of them planted different kinds of flowers among-rose, tulips, carnation, jasmine and lily. Neena owns a field in the country S and she has not planted tulips or rose. Rose is grown in a farm in country U, which is owned by Jaya. In country W, grows either lily or carnation. Latha has a field in country V but she is not growing Tulips. Carnation or Jasmine does not grow in country S.Who owns a field in country U?

Company B needs to hire 30 new employees. Ten percent (10%) of applicants do not meet the basic business requirements for the job. 12% of the remaining applicants do not pass the pre-screening assessment, 23% of those remaining applicants do not show up for the interview, and 5% of those applicants fail the backround investigation. How many applicants need to apply in order to meet the hiring target? Multiply choice 30 45 50 52 60

QUESTION 1 A _______is a large molecule that is built by linking smaller, similar subunits called ______. polymer; monogroups monomer; polygroups monomer, polymers polymer, monomers QUESTION 2 Hydrocarbons can have chemical groups attached to them. These chemical groups can change the properties of the hydrocarbon and can participate in chemical reactions. What are these chemical groups called? functional groups hydrocarbons molecular groups organic groups QUESTION 3 Match the macromolecule with its function (s). - A. B. C. D. carboydrate - A. B. C. D. lipids - A. B. C. D. nucleic acids - A. B. C. D. protein A. enzymes, defense, transport, support, motion, regulation B. contains genetic information C. energy storage, main component in membranes, D. energy, energy storage, structure QUESTION 4 Match the macromolecule with its monomer or parts. - A. B. C. D. carbohydrates - A. B. C. D. protein - A. B. C. D. nucleic acids - A. B. C. D. lipids A. amino acids B. monosaccharides C. glycerol and fatty acids D. nucleotides QUESTION 5 Select the following statements that describe a dehydration reaction. Select all that apply. molecule of water is added molecule of water is removed used to make a larger molecule from smaller subunits Used to break a larger molecule into smaller subunits QUESTION 6 The subunits (monomers) in macromolecules are linked by which type of bond? hydrogen ionic covalent van der Waals QUESTION 7 Which element is the main element found in an organic molecule? oxygen nitrogen carbon phosphorous QUESTION 8 Which of the following is found in DNA not RNA. Select all that apply. thymine adenine uracil ribose deoxyribose phosphate group QUESTION 9 At which level (s) of protein structure are interactions between the side chains (R groups) most important? primary secondary tertiary quaternary QUESTION 10 These biological compounds are non-polar and insoluble in water: carbohydrates lipids proteins nucleic acids QUESTION 11 Lactose is a ________________ formed by formation of a _____________ bond between glucose and galactose. polysaccharide; covalent polysaccharide; hydrogen disaccharide; covalent disaccharide; hydrogen monosaccharide; covalent QUESTION 12 The α-helix and β-pleated sheet are part of which structure? polysaccharide secondary protein structure DNA primary protein structure