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3 years ago

Which of the following is not an example of a chemical reaction? Rust, Photosynthesis, Melting Ice, Heat from Fire?

Physics

2 answers:

Zielflug [23.3K]3 years ago

7 0

Answer:

Melting ice is not an example of chemical reaction

Explanation:

Chemical reaction:

A reaction in which one or more chemical species are converted to one or more different chemical species is known as chemical reaction. During chemical reaction constituent atoms of the reactants are rearrange to create different substances as products.

Rusting is a chemical reaction because during rusting a new chemical substance is created

Photosynthesis is also a chemical reaction because during photosynthesis new product is formed.

Heat from fire is also a chemical reaction because during this reaction new product as gases are released

Melting ice is not a chemical reaction because after melting ice converted into water. So in both ice and water water molecules does not change only a physical change takes place during this reaction.

FinnZ [79.3K]3 years ago

5 0

Rust, photosynthesis, and heat from fire are all chemical reactions because new substances are formed and the chemical formula is changed. By doing this, bonds are broken and formed in the making of the new substance. Melting ice is physical change the molecules are still water molecules, it just changed physical form.

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2 years ago

Atmospheric pressure is greater at the base of a mountain than at

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The pressure on the outside of the bottle is greater than it was when he put the cap on. If anything could get out of the bottlde, it would. But it can't . . . the cap is on too tight. So all the water and all the air has to stay inside, and anything that can get squished into a smaller space has to get squished into a smaller space.

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3 years ago

A 350-g mass is attached to a spring whose spring constant is 64 N/m. Its maximum acceleration is 5.3 m/s2. What is the frequenc

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The frequency of oscillation is 2.153 Hz

What is the frequency of spring?

Spring Frequency is the natural frequency of spring with a weight at the lower end. Spring is fixed from the upper end and the lower end is free.

For the mass-spring system in this problem,

The Frequency of spring is calculated with the equation:

$f = \frac{1}{2\pi } \sqrt{\frac{k}{m} }$

Where,

f = frequency of spring

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m = mass attached to spring = 350g = 0.350 kg

a = maximum acceleration = 5.3 m/s^2

Substituting the values in the equation,

$f = \frac{1}{2\pi } \sqrt{\frac{64}{0.350} }$

$f = \frac{1}{2\pi } ( 13.522)$

$f = 2.1535 Hz$

Hence,

The frequency of oscillation is 2.153 Hz

Learn more about frequency here:

brainly.com/question/13978015

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2 years ago

A brick is resting on a smooth wooden board that is at a 30° angle. What is one way to overcome the static friction that is hold

lubasha [3.4K]

Answer:

to overcome the out of friction we must increase the angle of the plane

Explanation:

To answer this exercise, let's propose the solution of the problem, write Newton's second law. We define a coordinate system where the x axis is parallel to the plane and the other axis is perpendicular to the plane.

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let's use trigonometry to find the components of the weight

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fr = μ N

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from equation 1

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F = (μ mg) cos θ

We can see that the quantities in parentheses with constants, so as the angle increases, the applied force must be less.

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Consequently, to overcome the out of friction we must increase the angle of the plane

the correct answer is to increase the angle of the plane

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4 years ago