20 points will favor answer Please guys i could really use some help on this question

1 answer:

8 0

Answer : Option B) The oxygen in the air forms ozone in presence of UV rays

Explanation : The other given options for the chemical change seems to be irrelevant as the option A which converts water into different forms can be called as physical change, option C only dust and soot particle are released in air where no new substance is formed And in option D sulfur dioxide is getting released into air which is also a form of a physical process.

So in option B we can see a new compound getting formed which is ozone in presence of UV rays hence it is a chemical change.

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A cylindrical specimen of some metal alloy having an elastic modulus of 129 GPa and an original cross-sectional diameter of 4.4

miss Akunina [59]

Explanation:

The cross-sectional area of the specimen is calculated as follows.

$A_{o} = \frac{pi}{4} d^{2}$

= $\frac{3.14}{4} \times (\frac{4.4}{1000})^{2}$

= $1.5197 \times 10^{-5} m^{2}$

Equation of stress is as follows.

$\sigma = \frac{F}{A_{o}}$

And, the equation of strain is as follows.

$\epsilon = \frac{\Delta l}{l_{o}}$

Hence, the Hook's law is as follows.

E = $\frac{\sigma}{\epsilon}$

E = $\frac{\frac{F}{A_{o}}}{\frac{\Delta l}{l_{o}}}$

= $\frac{F \times l_{o}}{A_{o} \times \Delta l}$

or, $l_{o} = \frac{E \times \Delta l \times A_{o}}{F}$

= $\frac{129 \times 10^{9} \times \frac{0.48}{1000} \times 1.662 \times 10^{-5}}{1570}$

= 0.6554 m

or, $l_{o}$ = 655.4 mm

Thus, we can conclude that the maximum length of the specimen before deformation if the maximum allowable elongation is 0.48 mm is 655.4 mm.

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4 years ago

Enter the molecular formula for butane, C4H10.

STatiana [176]

This four-carbon compound is classified as an alkane, so its structure follows the generic formula CnH2n+2. The structure ofbutane is written as follows: CH3-CH2-CH2-CH3.

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4 years ago

What is the scientific method step that needs solving

pickupchik [31]

Conduct an experiment

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4 years ago

Why does hot water turn purple when poured over red cabbage leaves?

Xelga [282]

Answer:

By making it simpler for the pigment to dissolve in water by blending the cabbage leaves with warm water, you may extract it quickly.

Explanation: