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Butoxors [25]
3 years ago
10

Which of these is a chemical change?

Physics
2 answers:
Radda [10]3 years ago
7 0

Anything that says burned is a chemical reaction or a chemical change. Here's a burning reaction.

C2H5OH + 302 ===>  2CO2 +  3H2O

This is the equation for burning alcohol (the kind you drink). When burned, the alcohol's reaction leaves a beautiful blue flame along with CO2 and H2O on the right side.

So B is the answer.

You're not doing anything to paper if you shred it except make it smaller. It retains all of its chemical properties and almost all its physical properties.

Ice melting doesn't do anything to the water when it changes phase except you now have a puddle on the table where the ice (cube) was.  But you are still dealing with water.

Metal foil is heated, again the foil is left with all its chemical properties in tact. You can reuse the foil if you are cooking potatoes  in an open fire. Nothing has altered the chemical properties of the foil.  

Iteru [2.4K]3 years ago
6 0
The answer is when GAS IS BURNED because when gas is burned, it cannot return into its previous state. Also, new substances are formed.
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When you look at a white light bulb through red sunglasses, why does the light look red to your eyes? What happened to all the o
Lelu [443]

Answer:

The answer is explained below in explanation

Explanation:

Whenever light falls on a colored surface, that color of light is reflected by the surface and all the other colors are absorbed. That is a black body appears black in all lights, because it absorbs every color and a white surface appears to be of the color of the light shone upon it because it is the mixture of all colors of light and reflects every color. The eyes only see the reflected light colors. The absorbed colors are not apparent to the eyes.

<u>Hence, when the white bulb is seen through red sunglasses, it does look like red to our eyes, while all the other colors are absorbed by the sun glasses.</u>

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3 years ago
The map below shows major ocean currents in the North Atlantic and North Pacific Oceans. In general, currents flowing toward the
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d

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4 0
3 years ago
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Scuba divers use compressed oxygen gas to go diving. The oxygen's volume decreases as pressure is increased to fit more in an ox
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2 years ago
An automatic switch that opens when the current reaches a set value is called:
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3 years ago
Joe pushes down the length of the handle of a 10.9 kg lawn spreader. The handle makes an angle of 45.3 ◦ with the horizontal. Jo
yuradex [85]

Answer:

F = 13.08 N

Explanation:

given,

mass of spreader = 10.9 Kg

angle made with angle = 45.3°

accelerate the spreader to 1.35 m/s in 1.6 s.

Acceleration = \dfrac{v}{t}

                      = \dfrac{1.35}{1.6}

                      = 0.844 m/s²

momentum in = momentum out

F × t = m  × v

F cos \theta \times t = m \times v

F cos \ 45.3^0 \times 1.6 = 10.9 \times 1.35

F×1.125 = 14.175

F = \dfrac{14.175}{1.125}

F = 13.08 N

hence, the force applied by the joe is equal to F = 13.08 N

7 0
3 years ago
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