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3 years ago

True or False if something was turn to make something is it a chemical reaction

2 answers:

8 0

If something was turned? I'm not really sure what you are talking about, but for something to become a chemical reaction it involves and arrangement of molecular and ionic structure of a substance, as opposed to a change in physical form or a nuclear reaction.

Pani-rosa [81]3 years ago

8 0

It would only be a chemical reaction if you can't change the "something" back to what it was originally was

For example when you make pancakes that is a chemical reaction because you can't turn the baked pancake into the batter again

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Calculate the heat flux (in W/m^2) through a sheet of a metal 14 mm thick if the temperatures at the two faces are 350 and 140°C

ExtremeBDS [4]

Answer:

Explanation:

The rate of conductive heat transfer in watts is:

q = (k/s) A ΔT

where k is the heat conductivity, s is the thickness, A is the area, and ΔT is the temperature difference.

Given k = 52.4 W/m/K, s = 0.014 m, and ΔT = 350-140 = 210 K, we can find q/A:

q/A = (52.4 / 0.014) (210)

q/A = 786,000 W/m²

Given that A = 0.42 m², we can find q:

q = (0.42 m²) (786,000 W/m²)

q = 330,120 W

A watt is a Joule per second. Convert to Joules per hour:

q = 330,120 J/s * 3600 s/hr

q = 1.19×10⁹ J/hr

If we change k to 1.8 W/m/K:

q = (k/s) A ΔT

q = (1.8 / 0.014) (0.42) (210)

q = 11,340 J/s

q = 4.08×10⁷ J/hr

If k is 52.4 W/m/K and s is 0.024 m:

q = (k/s) A ΔT

q = (52.4 / 0.024) (0.42) (210)

q = 192,570 J/s

q = 6.93×10⁸ J/hr

5 0

2 years ago

Compare green and orange light from the visible spectrum. You are currently in a labeling module. Turn off browse mode or quick

77julia77 [94]

Green: nm 495–570. Yellow: nm 570–590. 590–620 nm for orange. Red: 620-750 nm (400–484 THz frequency)

Solids' molecules are strongly attracted to one another. As a result, the molecules are barely moving and tightly packed. Because of this, shape and volume are fixed.

The forces of attraction and repulsion in liquids are comparable. Compared to the solid state, they move a little bit more. They then assume the shape of the container while still having a fixed capacity.

The attraction forces between the molecules in gases are quite weak. They move quite freely and grow in an effort to fill as much space as they can. Consequently, their volume and shape vary (adopt the shape of the container).

You can learn more about states of the matter here:

brainly.com/question/18538345

#SPJ4

6 0

2 years ago

As the distance between an object and the center of the Earth is increased...

Alex

Explanation:

the answer is D.

have a great day !

3 0

2 years ago

Examine the following graph.

malfutka [58]

A) 0.2m since it's the height of the wave.

b)1s it's how long a wave is.

6 0

2 years ago

Is kinetic energy scalar quantity

VashaNatasha [74]

Yes, Kinetic Energy is a scalar quantity because the direction is not needed. A scalar quantity is one dimensional measurement.

Explanation:

Kinetic Energy is a scalar quantity that means it has only a magnitude and no direction.
Energy has a size but no direction; two objects can have the same kinetic energy but they travel in opposite directions.
The formula of Kinetic Energy is

K.E = $\frac{1}{2} mv^{2}$

Mass is a scalar quantity and velocity is a vector quantity.
squaring velocity will make vector to scalar quantity.

5 0

2 years ago

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