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xeze [42]
3 years ago
15

The temperature of a system rises by 45°C during a heating process. Express this rise in temperature in Kelvin. (Round the final

answer to the nearest whole number.)
Chemistry
1 answer:
postnew [5]3 years ago
4 0

Answer:

45K

Explanation:

Rise in temperature = Final - initial temperature.

temperature in K = Temperature in Celsius + 273

for Celsius; T2 -T1 =45°C

for kelvin; T2+273 -(T1+273) = ?

                T2+273 -T1-273 =?

                T2-T1 = ?

               T2-T1 =45k

hence ΔT(K) = ΔT(°C) (temperature difference in Celsius is equal to temperature difference in kelvin)

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Describe the structure of our galaxy, including its spiral arms.
gulaghasi [49]

Answer:

Most spiral galaxies consist of a flat, rotating disk containing stars, gas and dust, and a central concentration of stars known as the bulge. ... The spiral arms are sites of ongoing star formation and are brighter than the surrounding disc because of the young, hot OB stars that inhabit them.

Explanation:

6 0
2 years ago
Read 2 more answers
Which of Newton's Three Laws is BEST described by the following statement: A ball dropped from the 10th story of a hotel had mor
Zolol [24]

Answer:

I believe the answer is Newton's Second Law

Explanation:

Newton's Second Law states that the acceleration of an object will count on how much mass and the amount of force that is applied.

The bowling ball was dropped from the 10th story window and had more force than when the ball was dropped from the 5th story window because the 10th story window gave the bowling ball more acceleration.

8 0
2 years ago
In a certain industrial process involving a heterogeneous catalyst, the volume of the catalyst (in the shape of a sphere) is 10.
mamaluj [8]

Answer:

D

Explanation:

We know that the

reaction catalyzing power of a catalyst ∝ surface area exposed by it

Given

volume V1= 10 cm^3

⇒\frac{4}{3} \pi r^3= 10

hence r= 1.545 cm

also, surface area S1= 4\pi r^2

now when the sphere is broken down into 8 smaller spheres

S2= 8×4πr'^2

now, equating V1 and V2 ( as the volume must remain same )

\frac{4}{3}\pi r^3=8\times\frac{4}{3} \pi r'^3

and solving we get

r'= r/2

therefore, S2=8\times4\pi\frac{r}{2}^2

S2=2\times4\pi r^2

S2= 2S1

hence the correct answer is

. The second run has twice the surface area.

8 0
3 years ago
Consider the oxidation of sodium metal to sodium oxide described by the balanced equation:
mixas84 [53]

Answer:

1116 g.

Explanation:

The balanced equation for the reaction is given below:

4Na + O₂ —> 2Na₂O

From the balanced equation above,

1 mole of O₂ reacted to produce 2 moles of Na₂O.

Next, we shall determine the theoretical yield of Na₂O. This can be obtained as follow:

From the balanced equation above,

1 mole of O₂ reacted to produce 2 moles of Na₂O.

Therefore, 9 moles of O₂ will react to produce = 9 × 2 = 18 moles of Na₂O.

Finally, we shall determine the mass in 18 moles of Na₂O. This can be obtained as follow:

Mole of Na₂O = 18 moles

Molar mass of Na₂O = (23×2) + 16

= 46 + 16

= 62 g/mol

Mass of Na₂O =?

Mass = mole × molar mass

Mass of Na₂O = 18 × 62

Mass of Na₂O = 1116 g

Thus, the theoretical yield of Na₂O is 1116 g.

3 0
2 years ago
Write the equation, Aluminum metal reacts with oxygen gas to produce aluminum oxide solid.
Alenkasestr [34]
The equation is:4Al+3O2----2Al2O3
8 0
3 years ago
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