What would likely happen if you were to touch the flask in which an endothermic reaction were occuring? A. The flask would probably feel cooler than before the reaction started.
B. The flask would probably feel warmer than before the reaction started.
C. The flask would feel the same as before the reaction started.
D. none of the above

Answers

Answer 1

Answer:

Answer: A. The flask would probably feel cooler than before the reaction started.

Explanation: An endothermic reaction is a type of of chemical reaction in which energy is absorbed from the surroundings. The temperature of the surrounding decreases.

An Exothermic reaction is a type of of chemical reaction in which energy is released into the surrounding. The temperature of the surrounding increases.

When an endothermic reaction takes place in the flask, the heat is absorbed by the flask and thus the temperature of the surrounding (here the flask) will decrease which can be felt by touching the outside of the test tube. Thus the flask would appear colder.

Answer 2

Answer:

CCA Unit 3: Heat Energy and Reactions Unit Test Answers

Please keep in mind these are for CHECKING YOUR ANSWERS, not for using as an answer key to cheat!!

1. A

2. C

3. A

4. A

5. C

6. D

7. C

8. C

9. A

10. A

11. C

12. A

13. C

14. C

15. C

16. B

17. D

18. B

19. Q= = mass * specific heat * delta T 343 = 55.0 * specific heat (86.0-19.0) 343=3685 * specific heat specific heat = 0.0931 cal/g Celsius

20. Temperature is absolute while heat is relative. The direction of heat always travels to the warmer temperature of the object to the cooler one.

21. Ke=[C]^2/[A]^3[B}^2

22. A chemical reaction is spontaneous if an increase in the total entropy of the system and surroundings accompanies it.

Example:

4 Fe + 3 O 2 -> Fe 2 O 3

Enjoy guys ;)

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How much work is done by a crane that lowers 1000N of material a distance of 150

Which elements has the smallest first ionization energy?

Answers

Answer:

Cesium has smallest ionization energy.

Explanation:

Ionization energy is the energy that an atom at ground state must be absorb to release an electron to form a cation. for eg.

H ⇒ $H^(+) + e^(-)$

The unit of ionization energy is $(KJ)/(mol)$ .

The ionization energy is minimum for cesium & maximum for fluorine.

Ionization energy depends upon the radius of atom. cesium has smallest radius so it has low Ionization energy.

Therefore the cesium has smallest ionization energy.

A puppy is running with a speed of 11.2 m/s towards it owner when itgets distracted by a squirrel and stops running. If it halted its run in 2 s,
what is the puppy's acceleration?

Answers

Answer:

-5.6m/s²

Explanation:

Given parameters:

Initial speed = 11.2m/s

Time of running = 2s

Unknown:

Acceleration of the puppy = ?

Solution:

Acceleration is the rate of change of velocity with time.

So;

Acceleration = $(Final speed - initial speed )/(time)$

final speed = 0m/s

Acceleration = $(0 - 11.2)/(2)$ = -5.6m/s²

Final answer:

The puppy's acceleration is -5.6 m/s².

Explanation:

Acceleration is a measure of how quickly an object changes its speed. The formula for acceleration is a = Δv / Δt, where Δv is the change in velocity and Δt is the change in time. To find the puppy's acceleration, we can use the formula for acceleration:

acceleration = (final velocity - initial velocity) / time.

In this case, the initial velocity is 11.2 m/s and the final velocity is 0 m/s (since the puppy stops running). The time taken to stop is 2 s.

Substituting the values into the formula, we get:

acceleration = (0 m/s - 11.2 m/s) / 2 s.

Simplifying the equation gives us the acceleration of the puppy, which is -5.6 m/s².

Learn more about acceleration here:

brainly.com/question/11789833

#SPJ3

suppose that you look into a photometer's eyepiece and the fluorescent disks appear to be equal in intensity. If the distance between the photometer to lamp 1 is 400mm, the distance between the photometer to lamp 2 is 200 mm, and the intensity of lamp 2 is known to be 15 candelas, what is the intensity to lamp 1?

Answers

Use the Inverse square law, Intensity (I) of a light is inversely proportional to the square of the distance(d).

I=1/(d*d)

Let Intensity for lamp 1 is L1 distance be D1 so on, L2 D2 for Intensity for lamp 2 and its distance.

L1/L2=(D2*D2)/(D1*D1)

L1/15=(200*200)/(400*400)
L1=15*0.25
L1=3.75 candela

A particle moves horizontally in uniform circular motion, over a horizontal xy plane. At one instant, it moves through the point at coordinates (2.50 m, 2.50 m) with a velocity of -5.00i hat m/s and an acceleration of -10.0j m/s2. What are the coordinates of the center of the circular path?

Answers

Answer:

(2.5,0)

Explanation:

The particle can be described by the following equations:

$x=Rsin(-\omega t)+2.5\ny=Rcos(-\omega t)\n(dx)/(dt)=-\omega Rcos(-\omega t)\n(dy)/(dt)=\omega Rsin(-\omega t)\n(d^2x)/(dt^2)=-\omega^2Rsin(-\omega t)\n(d^2y)/(dt^2)=-\omega^2Rcos(-\omega t)$

For R = 2.5, ω = 2 and t = 0:

$x=2.5\ny=2.5\n\n(dx)/(dt)=-5\n (d^2y)/(dt^2)=-10$

The center of the circle would be at point (2.5,0)

Air is a good conductor of heat. Please select the best answer from the choices provideda. True
b. False

Answers

the answer would be true because air can be heated easily

An outfielder throws a baseball with an initial speed of 81.8mi/h. Just before an infielder catches the ball at the same level, the ball’s speed is 110 ft/s. In foot-pounds, by how much is the mechanical energy of the ball– Earth system reduced because of air drag? (The weight of a baseball is 9.0 oz.)

Answers

Answer:

-20.158ft-lb

Explanation:

Check the attached files for the explanation.

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