Numerade

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It takes 1.20L of pure oxygen gas at STP to react completely with a certain sample of aluminum. What is the mass of aluminum reacted? 4Al(s) + 3O2(g) -> 2Al2O3 (s)

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Identify each of the following substances as a strong electrolyte, weak electrolyte, or nonelectrolyte. Explain how you can tell. a. HNO3 b. HCl c. NaCl d. CaCO3 e. H2CO3 g. NaNO2 h. H2SO3 i. HF j. H2O k. LiOH l. CH3OH m. O2 n. NH4Cl

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Equivalent units express the amount of work done during a period of time in terms of fully completed units of output. True False

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4) An iron sphere of diameter 80 mm, initially at a uniform temperature of 200 °C is suddenly exposed to ambient air at 30 °C with convection coefficient of 510 W/m²K. (a) Calculate the temperature at the sphere center and at a depth of 5 mm from the surface at 1 minute after exposure to the convection environment. (b) Calculate the heat removed from the sphere in this duration. Assume the density, specific heat, thermal conductivity and thermal diffusivity for the sphere as 8000 kg/m³, 460 J/kg K, 60 W/m K and 1.6 X 10?? m²/s, respectively. [10 marks]

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There are 110 unemployed people, 1,168 employed people, and the adult population is 1,757. What is the labor force participation rate?

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The following are selected 2025 transactions of Marigold Corporation. Sept. 1 Purchased inventory from Encino Company on account for $73,500. Marigold records purchases gross and uses a periodic inventory system. Oct. 1 Issued a $73,500,12-month, 8% note to Encino in payment of account. Oct. 1 Borrowed $73,500 from the Shoyَe Bank by signing a 12-month, zero-interest-bearing $79,380Note Compute the total net liability to be reported on the Decemeber 31 balance sheet for 1) the interest bearing note 2) the zero interest bearing note

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Alice just got a 20% raise. Under what conditions is this raise likely to increase her happiness long-term? A. Alice comes from a wealthy family and she now is able to match the lifestyles of her siblings B. Alice worked hard for the raise and her efforts have finally been recognized C. Alice had been struggling to pay her bills but can now manage D. Alice was comfortably middle-class but can now take nice vacations each year

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The original length of each spring, AB and CB, is 5 ft and their stiffness is K lb/in. The stiffness of spring DB is also K lb/in. After attaching the W lb box, the stretch in spring DB was measured at 1.2 in. l = 12 in. Write the equilibrium equation in the y direction and calculate: 0 hours : 49 minutes : 49 seconds W = 542 lb The stretched length of spring BD: The stretched length of spring BC and BA: The stiffness of all three springs: The force in spring BD: The force in spring BC and BA:

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Assume that ΔH = 19.4 kJ and ΔS = 62.3 J/K. At what temperature will K = 45? report your answer in Kelvin to 2 decimal places.

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Question 12 2 pts Piaget asserts that normal cognitive growth passes through the following four stages: infancy, early childhood, middle childhood, adolescence birth, childhood, adolescence, adult infancy, early childhood, assimilation, accommodation infancy, toddler, child, adult Question 13 1 pts According to Piaget's theory of cognitive development, a scheme is an organized pattern of thought or action applied to persons, objects, or events in an effort to make sense of them. True False

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kathryn m.