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Shalin L

Numerade Educator

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Numerade tutor for 4 years
167 Students Helped

Shalin's Quick Ask Videos

02:09
Physics 101 Mechanics

You are testing a new amusement park roller coaster with an empty car with a mass of 110 kg. One part of the track is a vertical loop with a radius of 12.0 m. At the bottom of the loop (point A) the car has a speed of 25.0 m/s and at the top of the loop (point B) it has a speed of 8.00 m/s.

- As the car rolls from point A to point B, how much work is done by friction? Express your answer in joules.
01:58
Chemistry 101

Gaseous ammonia was introduced into a sealed container and
heated to a certain temperature: 2 NH3(g) ⇌ N2(g) + 3 H2(g) At
equilibrium, [NH3] = 0.0229 M, [N2] = 0.117 M, and [H2] = 0.363 M.
Calculate Kc for the reaction at this temperature.
03:13
Physics 101 Mechanics

A sled is coasting across the snow and slowing
down.
Identify which of the listed forces are exerted upon the object.
Select 3.
Group of answer choices
Force of gravity
Normal force
Friction force
Tension force
Applied force
05:54
Chemistry 101

For the reaction shown, calculate how many moles of NH3 form when each amount of reactant completely reacts.
3N2H4(l) → 4NH3(g) + N2(g)

1. 5.1 mol N2H4
Express your answer using two significant figures.

2. 2.28 mol N2H4
Express your answer using three significant figures.

3. 5.7×10^−2 mol N2H4
Express your answer using two significant figures.

4. 9.19×10^7 mol N2H4
Express your answer using three significant figures.
02:11
Chemistry 101

Imagine a molecule X2Y4 where X has 4 valence electrons and Y has 1 valence electron. The valence of X is 4 and the valence of Y is 1. How many bonds and lone pair electrons are on one atom X? (Hint: Draw the Lewis structure.)
Options:
Two single bonds and two lone pair of electrons.
Three single bonds and one lone pair of electrons.
One single bond and three lone pair of electrons.
Two single bonds, one double bond, and zero lone pair of electrons.
One single bond, one double bond, and one lone pair of electrons.
01:21
Chemistry 101

0.003 281 g
Express your answer using three significant figures as a
decimal.
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