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We learned that silicon is the second most abundant element in Earth's crust, accounting for more than one-fourth of the mass of the crust.
What mass og magnesium phosphate is produced when7.00g of magnesium hydoxide reacts with 9.00g of phosphoricacid?
When you push a 1.80- book resting on a tabletop, it takes 1.65 to start the book sliding. What is the frictional force exerted on the book when you push on it with a force of 0.90 ?
When ethanol is heated with an excess of acidified potassium dichromate,it is converted to ethanoic acid:What other substance and conditions are needed to carry out this reaction?
How long would a 2.00 kW space heater have to run to put into a kitchen the same amount of heat as a refrigerator (coefficient of performance = 4.00) does when it freezes 2.25 kg of water at 22.0&de
0.3g of magnesium is mixed with 50ml of 1mol/L HCl. The temperature of the solution increased from21.10C to 510C, What is the molarenthalpy of combutsion for magnesium?
A wire with a length of 2.7 m and a mass of 0.89 kg is in a region of space with a magnetic field of 0.72 T. What is the minimum current needed to levitate the wire?
The intensity of a sound wave is the rate of energy transferred to an area perpendicular to the waves, and is given by the relationship I = P/A. What is true about the power transmitted in a wave if
What are the mole percents of XeF4 and XeF6 in the product?15.9% ; 84.1%I really do not know how to go about doing this question.Would appreciate some help.
The higher level has a rough section of length L. After passing this section the block slides head on into a spring. The block momentarily stops after compressing the spring by d. The block initial
A diver jumps from rest at the top of a platform that is h = 8.0 m above the surface of a pool. She penetrates the water to a depth d = 4.5 m before coming to rest again. Her mass is m = 85 kg. Find
The current in the RC circuit is recorded without interruption throughout these discharging and charging steps. schematically show the expected behavior of this current as a function of time.
If the loop of wire carries a current of 10 amperes, what is the magnitude and direction of the net magnetic force on the loop? (Ignore the forces on the straight connecting wires, and the fact that
Using only these data and the values of speed of light c and electronic charge e, find the work function of sodium, and a value for Planck's constant.
What is the total distance travelled by the truck? What is the average velocity of the truck for the motion described?
Determine a potential energy function U(x), using the origin as a reference. Sketch a single graph showing the two curves U and F. Describe the resulting motion of the object in words.
A person with a mass 60.0 kg runs 7.50 m up some stairs, gaining 4.00 m elevation in 3.50 s. (a) Find the power output of the person. (b) Find the time for the same person to carry 10.0 kg up the sa
Find the total distance the block will slide. Describe all of the energy transformations and / or transfers that occur during this event.
The roof is tilted 30.0 deg above horizontal and the edge of the roof is 5.00 m above ground level. Question: find the impact speed of the block.
Magnesium reacts with HCl to produce MgCl2 and hydrogen gas. How many Milliliters of a 1.85 M HCl solution completely react with 4.00 grams of magnesium?
Calculate the mass of methane that must be burned to provide enough heat to convert 294.0 g of waterat 32.0°C into steam at 122.0°C. (Assume that the H2O produced in the combustion reaction
A 0.15 kg particle moves along an x axis according x(t) = -13 + 2t + 4t2 - 3t3, with x in meters and t in seconds. Give an expression for the (a) x, (b) y and (c) z components of the net force (in N
Four small spheres, each of which can be regarded as a point mass of 0.200 kg, are arranged in a square 0.400 m and connected by extremely light rods. Find the moment of inertia of the system about
The pH of saturated Sr(OH)2(aq) is found to be 13.12. A15.0 mL sample of saturated Sr(OH)2(aq) is diluted to250.0 mL in a volumetric flask. A 15.0 mL sample of the dilutedSr(OH)2(aq) is transferred to
Energy is conventionally measured in Calories as well as in joules. One Calorie in nutrition is one kilocalorie, defined as 1 kcal = 4186 J. Metabolizing 1 g of fat can release 9.00 kcal.