Which of the following is the correct condensed electron configuration for the atom or ion indicated?
a) The electron configuration of Cu is [Ar]4s23d9.
b) The electron configuration of Si4+ is [Ar].
c) The electron configuration of Cl+ is [Ar].
d) The electron configuration of In3+ is [Kr]4d10.
e) The electron configuration of V is [Ar]4s24d3.
In: Chemistry
Use the ideal gas law to complete the table:
| P | V | n | T |
| 1.06 atm | 1.25 L | 0.105 mol | ___ |
| 115 torr | ___ | 0.249 mol | 309 K |
| ___ | 28.2 mL | 1.81×10−3 mol | 26.0 ∘C |
| 0.565 atm | 0.440 L | ___ | 257 K |
In: Chemistry
A rifle of mass M is initially at rest. A bullet of mass m is fired from the rifle with a velocity v relative to the ground. Which one of the following expressions gives the velocity of the rifle relative to the ground after the bullet is fired?
A) −mv
B) mv
C) Mv/m
D) mv/M
In: Physics
An ideal transformer has 50 turns in its primary and 250 turns in its secondary. 12 V ac is connected to the primary. Find:
a. The voltage ac available at the secondary.
b. Current in the 10 ohms device connected to the secondary.
c. Power supplied to the primary.
d. Power supplied to the secondary.
In: Physics
A highway has a flat section with a tight curve of radius 40 m. The curve is level with respect to the ground. If the coefficient of static friction between tires and pavement surface is 0.45, what is the maximum speed v at which a car of inertia m can negotiate the curve safely —that is without the tires slipping?
In: Physics
Write the four Maxwell’s Equations, together with the defining relationship for the fields (F~ = q(E~ + ~v × B~ ), and give a short summary of the experimental basis for each and define all symbols. Then describe Maxwell’s modification of Ampere’s Law and outline (without mathematical details) how it shows that light is an electromagnetic wave.
In: Physics
| Suppose that a particle has the following acceleration vector
and initial velocity and position vectors. a(t) = 7 i + 9t k, v(0) = 4 i − j, r(0) = j + 5 k |
| (a) | Find the velocity of the particle at time t. |
| (b) | Find the position of the particle at time
t. |
In: Math
An RLC circuit is made up of a resistor R = 12Ω , a capacitor C
= 0.1 F and an inductor L = 2 H. A voltage source is connected that
supplies 110 V. If initially the capacitor is
discharged and no current flows through the circuit, find an
expression for the charge at all times t.
differential equations
In: Math
You add 300 mL of Tris-HCl at 0.1 M to a 0.2 L solution
of 0.9% (w/v)NaCl, and to which you add 500 mg of NaCl
(powder).
What is the concentration of Tris-HCl in mM and in
g/L?
Tris-HCl : MW 121.14
NaCl : MW 58.44
In: Biology
Toxic levels of lead are 5 ug/dL in the blood of children and 10 ug/dL in the blood of adults. If the lead levels were measured at 1.5% m/v and a child with 2.5 L of blood drank 1 L of that water, would they be at risk of lead toxicity? Justify your answer with calculations.
In: Chemistry