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3 years ago

A material absorbs or reflects all of the light that reaches it. What type of material is it?

1 answer:

7 0

Material that absorbs or reflects all light that reaches it is called opaque.

An object is translucent when it allows some light to go through and reflects the others It is transparent when all light goes through it. Pigmented on the other hand changes the color of the light.

The answer is D.

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Determine the amount of water that must be added to a 2-litre solution of sulphuric acid to dilute it from a pH of 2.7 to a pH o

Ksivusya [100]

Answer:

Volume of water added = 2.0 L

Explanation:

Initial pH of the solution = 2.7

[H^+] concentration in 2 L solution of sulfuric acid,

$pH = -log[H^+]$

$[H^+] = 10^{-pH}\ M$

$[H^+] = 10^{-2.7} = 0.001995\ M = 0.002\ M$

Final pH of the solution = 3

Final [H^+] concentration of sulfuric acid,

$[H^+] = 10^{-pH}\ M$

$[H^+] = 10^{-3} = 0.001\ M$

Now,

$M_1V_1=M_2V_2$

$0.002 \times 2.0 = 0.001 \times V_2$

$V_2 = \frac{0.002 \times 2.0}{0.001} = 4.00\ L$

Volume added = Final volume - Initial volume

= 4.0 - 2.0 = 2.0 L

4 0

4 years ago

One of the ingredients used to make bread is yeast, a type of microorganism. This may seem odd, to use a microorganism as an ing

Shalnov [3]

The answer would be B.

4 0

3 years ago

Read 2 more answers

State the purpose of respiration.

navik [9.2K]

To provide for the exchange of oxygen and carbon dioxide between the atmosphere and the blood

7 0

3 years ago

Read 2 more answers

A gaseous mixture at 265K and 1.0 atm contains 25 O2 60 N2 and 15 CO2 mole basis The velocities of the components are 0.084 cm s

Free_Kalibri [48]

Answer:

The molar average velocity is 0.0588 cm/s

The N₂ diffusion velocity relative to the mole average velocity is -0.1428 cm/s

The molar diffusional flux of N₂ is -3.9x10⁻³

Explanation:

Given data:

T = temperature = 265 K

O₂ = 25%

N₂ = 60%

CO₂ = 15%

vO₂ = -0.084 cm/s

vN₂ = 0.12 cm/s

vCO₂ = 0.052 cm/s

The molar average velocity is equal:

$v_{av} =(0.25*(-0.084))+(0.6*0.12)+(0.15*0.052)=0.0588cm/s$

The N₂ diffusion velocity relative to the molar average velocity is:

$v_{i} -v_{av} =-0.084-0.0588=-0.1428cm/s$

The molar diffusional flux of N₂ is:

$N_{N_{2} } =\frac{P}{RT} y_{A} (v_{i} -v_{av} )=-3.9x10^{-3}$

8 0

4 years ago

Melamine is used for making

vodomira [7]

Answer:

Melamine is used for making tableware,cooking utensils, plates, plastic products etc.

Explanation:

Melamine is used to manufacture many products. How? Well melamine-formaldehyde resin, as it's full name, forms molecular structures that are molded, with heat, to take the shape of the items such as tableware.

After this chemical reaction takes place, the "left over" remains as plastic.

_________________________________________________

And so, it is used in products such as cooking utensils, plates, plastic products etc.

3 0

3 years ago