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Rahel K

Numerade Educator

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Numerade tutor for 4 years
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Rahel's Quick Ask Videos

05:52
Chemistry 101


Based on the molecular formula, which alkane would likely exist
as a solid at room temperature and pressure?
a.
C20H42
b.
C8H18
c.
C4H10
d.
CH4

03:34
Chemistry 101

When 2.63 g of a polypeptide is dissolved in 533 mL of water,
the resulting solution is found to have an osmotic pressure of
0.125 atm at 37.0 °C. What is the molar mass of the polypeptide?
(Assume the volume doesn't change when the polypeptide is
added.)

05:05
Chemistry 101

5. A platinum catalyst is
used in catalytic converters to hasten the oxidation of carbon
monoxide:
2 CO(g) + O2(g) D 2
CO2(g) + heat (Exothermic)
Suppose that you have a closed reaction vessel containing an
equilibrium mixture of CO(g), O2(g) and
CO2(g). Will the amount of CO(g) increase, decrease or
remain the same when:
The temperature is increased ______________________
The pressure is increased by adding argon gas
______________________
The pressure is increased by adding O2 gas
______________________
A chemical absorbent is added which removes some CO2
___________________
A platinum catalyst is added ______________________

03:43
Biology

When there is a large
between two areas, there will be a net movement
of water from the high concentration area towards the low
concentration area. Once the gradient no longer exists, the
system is said to be in

answer choices:
Concentration gradient, equilibrium
Water gradient, equilibrium
Equilibrium, tonicity
Concentration gradient, balance

02:29
Chemistry 101

The element sulfur would be expected to form __ (#) covalent
bond(s) in order to obey the octet rule.
Use the octet rule to predict the formula of the compound that
would form between sulfur and bromine , if the molecule contains
only one sulfur atom and only single bonds are formed. Formula:

02:17
Chemistry 101

The speed of light is 3.00 x 108 m/s. What is this
speed in feet per minute? (1 m = 3.28 ft)

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