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Chemistry

1 answer:

aliina [53]2 years ago

5 0

Answer:

The second answer choice

Explanation:

X seems to list attributes for opaque objects, and y lists attributes of Transparent objects.

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A 1.00 cm2 blackbody surface emits 201 watts of radiant power. What is the temperature of the surface? Give to the nearest whole

erastovalidia [21]

Explanation:

Formula for black body radiation is as follows.

$\frac{P}{A} = \sigma \times T^{4} J/m^{2}s$

where, P = power emitted

A = surface area of black body

$\sigma$ = Stephen's constant = $5.6703 \times 10^{-8} watt/m^{2}.K^{-4}$

As area is given as 1.0 $cm^{2}$ . Converting it into meters as follows.

$1.00 cm^{2} \times \frac{(10^{-2})^{2} m^{2}}{1 cm^{2}}$ (as 1 m = 100 cm)

= $1 \times 10^{-4} m^{2}$

It is given that P = 201 watts. Hence,

$\frac{201 watts}{1 \times 10^{-4} m^{2}}$ = $5.6703 \times 10^{-8} watt/m^{2}.K^{-4} \times T^{4}$

$T^{4}$ = $35.45 \times 10^{12}$

T = $(35.45 \times 10^{12})^{1/4}$

= 8862.5 K

Thus, we can conclude that the temperature of the surface is 8862.5 K.

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2 years ago

What is the approximate ratio of [NO2-] to [HNO2] in order to buffer a solution at pH=4.0?

Strike441 [17]

For the equilibrium that exists in an aqueous solution of nitrous acid (HNO2, a weak acid) ... [H+][NO2. –]. [HNO2]. PAGE: 14.1. 2. Which of the following is a conjugate ... Using the following Ka values, indicate the correct order of base strength. HNO2. Ka = 4.0 × 10–4 .... Calculate the [H+] in a solutionthat has a pH of 11.70.
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2 years ago

Bauxite is the chief ore from which aluminum is extracted. Which of these statements is correct about bauxite?

Eddi Din [679]

Answer : The correct answer is Option D.

Explanation:

Ores are defined as natural occurring substance from which metals and another mineral are extracted.

Bauxite is primary ore of an aluminium metal. it doesn't have definite or specific chemical composition. This is because it contains mixture of hydrous aluminum oxide $Al_2O_3$ , aluminum hydroxides $Al(OH)_3$ , insoluble materials like hematite, quartz ,geothite ,magnetite etc.