College Nursing Papers

Uranium-235 (U-235) radioactively decays into Lead-207 (Pb-207). If I’m measuring the number of atoms in a mineral, and I find that there are 1000 atoms of U-235 and 3000 atoms of Pb-207, then how many atoms of these elements were in the mineral when the rock first formed?

Select one:

a. 3000 of U-235 and 1000 of Pb-207

b. 2000 of U-235 and 2000 of Pb-207

c. 4000 of U-235 and 1000 of Pb-207

d. No U-235 and 4000 of Pb-207

e. 4000 of U-235 and no Pb-207

In the last question, I measured 1000 atoms of U-235 (parent) and 3000 atoms of Pb-207 (daughter) in a mineral. If the half life of U-235 is 700 million years, then how old is the mineral? If the mineral came from an igneous rock, then how old is the rock?

Select one:

a. The mineral is 700 million years old, and the rock is the same age

b. The mineral is 1400 million years old, and the rock is the same age

c. The mineral is 700 million years old, and the rock is 1400 million years old.

d. The mineral is 2100 million years old, and the rock is the same age.

e. The mineral is 2100 million years old, but we can’t determine the age of the rock.

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The experimental rate law for the decomposition of nitrous oxide (N2O) to N2 and O2 is Rate = k[N2O]^2 .

Two mechanisms are proposed:

Mechanism I.

N2O → N2 + O

N2O + O → N2 + O2

Mechanism II.

2N2O → N4O2

N4O2 → 2N2 + O2

Which of the following would be the correct mechanism?

A. Mechanism I with the second step as the rate-determining step

B. Mechanism II with the second step as the rate-determining step

C. Mechanism I with the first step as the rate-determining step

D. Two of these could be correct.

E. None of these could be correct.

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A client is admitted with a diagnosis of schizophrenia— catatonic type, and is in the excited phase. The client paces continuously and shouts when people speak to him. A short-term goal for this client is:

A. Client sleeps through the night

B. Client attends all unit social activities.

C. Client maintains admission weight.

D. Client performs self-grooming activities daily. 

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A Federation starship (7.5 multiplied by 106 kg) uses its tractor beam to pull a shuttlecraft (5.0 multiplied by 104 kg ) aboard from a distance of 12 km away. The tractor beam exerts a constant force of 4.0 multiplied by 104 N on the shuttlecraft. Both spacecraft are initially at rest. How far does the starship move as it pulls the shuttlecraft aboard?

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black coat in cocker spaniels is dominant, while red coat is recessive, a single color pattern is dominant, while multi-color pattern is recessive. a solid black male is mated to a solid red female and produces a litter of six pups: two solid black, two solid red, one black and white, one red and white. determine the genotypes of the parents and their pups.

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A chair of weight 70.0 N lies atop a horizontal floor; the floor is not frictionless. You push on the chair with a force of F = 45.0 N directed at an angle of 43.0^circ below the horizontal and the chair slides along the floor.

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A 23.0-kg body is moving in the direction of the positive x axis with a speed of 292 m/s when, owing to an internal explosion, it breaks into three pieces. One part, whose mass is 8.5 kg, moves away from the point of explosion with a speed of 302 m/s along the positive y axis. A second fragment, whose mass is 3.0 kg, moves away from the point of explosion with a speed of 382 m/s along the negative x axis. How much energy was released in the explosion? Ignore effects due to gravity.

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A 4.5 kg ball ofSilly Putty © is traveling upward at 32 m/s. It collides in a perfect inelastic collision with another ball of Silly Putty © traveling downward at 16 ml/s and has a mass of 2.4 kg. Neglecting air drag, how high does the combined mass rise above the collision point: Hint – you’ll need a couple of conservation laws (momentum & energy)

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The unwillingness of a company to fund a carefully design clinical trial to demonstrate the effectivness of a claim that their product results in rapid and significant weight loss is essentially an admission that they know this claim to be false

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Hydrogen peroxide can be prepared by the reaction of barium peroxide with sulfuric acid according to

BaO2(s) + H2SO4(aq) ——–> BaSO4(s) + H2O2(aq)

How many milliliters of 2.50 M H2SO4(aq) are needed to react completely with 50.1 g of BaO2(s)

……….ml

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