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3 years ago

A student investigates the motion of a toy vehicle. The student graphs 40 seconds of data from the investigation.

1 answer:

8 0

Although we do not have the graph needed to answer this question, we can confirm that if the toy were to be accelerating, one should see this on the graph as a curved line.

<h3>How can we know if the toy was accelerating?</h3>

When graphing motion in terms of distance over time, we can use the shape of the line in the graph to determine if the speed is constant or if there is an acceleration present. If the line is straight, the speed is constant, but if there is a curve, there will be acceleration.

Therefore, we can confirm that if the toy were to be accelerating, one should see this on the graph as a curved line.

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When 5.00 g of NH4NO3 is dissolved in 100.0 g of water in a styrofoam cup, the T = - 3.82 ^°C. Is the process of dissolving ammo

miv72 [106K]

Answer:

The process is endothermic.

Heat is 26,9 kJ/mol

Explanation:

The dissolution of NH₄NO₃ in water is:

NH₄NO₃ → NH₄⁺ + NO₃⁻

As the change of temperature in the cup is ΔT = -3,82°C

<em>The process is endothermic</em>. Because the temperature is decreasing in the process. That means the process needs heat.

Assuming the heat capacity of the solution is 4.18 J/Kg :

q = -C×m×ΔT

Where q is heat, C is heat capacity (4,18J/Kg), m is mass (105g) and ΔT is change in temperature (-3,82°C)

q = 1677 J ≈ <em><u>1,68kJ</u></em>

The moles of NH₄NO₃ dissolved are:

5,00g × (1mol / 80,043g) = <em><u>0,0625 moles</u></em>

That means heat of this process in kJ/ mol is:

1,68kJ / 0,0625moles = <em>26,9 kJ/mol</em>

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I hope it helps!

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3 years ago

What does Le Chateliers principle say about upsetting a system at equilibrium

iragen [17]

Le Chatelier principle says, if a restriction is applied to a system in equilibrium, the system adjusts to a new equilibrium that tends to counteract the restriction. When equilibrium is under stress it will shift to relieve that stress.

all concentrations would change.

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3 years ago

What are the colors of metal

madreJ [45]

Answer:

brown and silver

Explanation:

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3 years ago

Which of the following is true regarding the speed of earthquake waves?

tankabanditka [31]

Surface waves arrive at a seismograph first because they are not impeded by rocks

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3 years ago

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Type the correct answer in the box. Calculate the molar mass of aluminum oxide (Al2O3). Express your answer to four significant

Zepler [3.9K]

Molar mass can be given as the mass of each constitutive element in the formula unit. The molar mass of aluminum oxide is 101.957 grams.

<h3>What is a formula unit?</h3>

Formula unit can be defined as the one unit of the molecular formula of the compound. It describes the number of atoms of each element present in the compound.

The formula unit for Aluminum oxide is $\rm Al_2O_3$ . The molar mass has been the sum of the mass of aluminum and oxygen.

The molar mass of aluminum oxide has been given as:

$\rm Molar\;mass=2\;\times\;Al+3\;\times\;O\\Molar\;mass=2\;\times\;26.98\;+\;3\;\times\;15.99\;grams\\Molar\;mass=101.957\;grams$

The molar mass of aluminum oxide is 101.957 grams.

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3 years ago