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zubka84 [21]
3 years ago
10

A kilogram of aluminum metal and a kilogram of water are each warmed to 75 ∘C and placed in two identical insulated containers.

One hour later, the two containers are opened and the temperature of each substance is measured. The aluminum has cooled to 35 ∘C while the water has cooled only to 66 ∘C.
Chemistry
1 answer:
zimovet [89]3 years ago
7 0

Answer:

Explanation:

The difference is in the amount of heat required to increase their temperature by 1 °C

It takes 4.19 joules to increase the temperature of water by 1 °C compared to Aluminium which is 0.900 joules to raise the temperature by  1 °C. Consequently, Aluminum will cool easily compare to water which will retain some of it heat longer because it does not heat up quickly like Aluminum.

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what will the new volume of a 22.4L same of a gas at STP if the pressure remains constant and the temperature is cut in half? A.
In-s [12.5K]

Answer:

\boxed{\text{C. 11.2 L}}

Explanation:

The pressure is constant, so we can use Charles' Law to calculate the volume.

\dfrac{V_{1}}{T_{1}} = \dfrac{V_{2}}{T_{2}}

Data:

V₁ = 22.4 L; T₁ = 273.15 K

V₂ = ?;         T₂ = 136.58 K

Calculations:

\dfrac{ 22.4}{273.15} = \dfrac{ V_{2}}{136.58}\\\\0.082 00 = \dfrac{ V_{2}}{136.58}\\\\V_{2} =0.082 00 \times 136.58 = \boxed{\textbf{11.2 L}}

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3 years ago
A 222 N force is required to keep an object moving along a circular path with a diameter of 11.6 m at a speed of 7.60 m/s. What
Arte-miy333 [17]

Answer:

m=22.3\ kg

Explanation:

The expression for centrifugal force is shown below as:-

F=\frac{m\times v^2}{r}

Where, m is the mass of the object = ?

v is the velocity of the object = 7.60 m/s

r is the radius

F is the force = 222 N

Diamter = 11.6 m

Radius = d/2 = 11.6 m/2 = 5.8 m

Applying the values in the above expression as:-

222=\frac{m\times {7.60}^2}{5.8}

57.76m=1287.6

m=22.3\ kg

7 0
3 years ago
Does the addition of a catalyst affect the ΔH of reaction?
Semenov [28]

Answer:

no

Explanation:

because its just no lol.

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Find the time Δt it takes the magnetic field to drop to zero. Express your answer in terms of some or all of the quantities a, B
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Δt= \frac{NB_0 \pi a^2 }{IR}

This because ε = dΦ/dt, and emf is a voltage so it can also be written as dΦ/dt = IR

Because ΔΦ= ABcosθ for each of the N loops and cosθ is just 1 here only A needs to be replaced, and it can be replaced with A=πr^2, which makes that part of the equation ΔΦ_m=N*B0*πa^2
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When will oppositely charged atoms stick together?
tangare [24]

Answer:

in an ionic bond.

Explanation:

i hope thats right

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3 years ago
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