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4 years ago

Is platinum carbonate naturally occurring or human made?

Physics

1 answer:

skad [1K]4 years ago

6 0

Answer:

Explanation:

Platinum is a noble metal. The concentrations of platinum in the soil, water and air are very minimal. ... Finally, a danger of platinum is that it can cause potentiation of the toxicity of other dangerous chemicals in the human body, such as selenium.

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Which body have a period of revolution of 29.6 days?

Kaylis [27]

It would be C the moon because the total of all positions (new moon, first quarter, third quarter, full moon, waxing crescent, waning crescent, waxing gibbous, waning gibbous) of the moon would take about 29.6 days on a regular calendar. I hope this helps. :)

6 0

3 years ago

Read 2 more answers

A monatomic ideal gas in equilibrium at a pressure of 3 kPa and a temperature of 300 K is initially confined in a volume of 1.3

GuDViN [60]

To solve this problem, it is necessary to apply the concepts related to the change of entropy in function of the Volume in two states due to the number of moles and the ideal gas constant, this can be expressed as

$\Delta S = nRln(\frac{V_2}{V_1})$

Where,

R = Gas constant

V = Volume (at each state)

At the same time the number of moles of gas would be determined by the ideal gas equation, that is,

$n = \frac{PV}{RT}$

Where,

P = Pressure

V = Volume

R = Gas Constant

T = Temperature

$n = \frac{(1000Pa)(1.3m^3)}{(300K)(8.314Pa\cdot m^3\cdot K^{-1}\cdot mol^{-1})}$

$n = 0.521mol$

Using the value of moles to replace it in the first equation we have

$\Delta S = (0.521mol)(8.314Pa\cdot m^3\cdot K^{-1}\cdot mol^{-1})ln(\frac{10.3m^3}{1.3m^3})$

$\Delta S = 9.01J/K$

Therefore the correct option is A.

7 0

4 years ago

Physical science challenge me to

KengaRu [80]

Answer:

What does this mean i don't get you??

7 0

3 years ago

I’ll mark brainless please hurry

sukhopar [10]

Answer:

Covalent bonds can form between similar atoms.

Explanation:

4 0

3 years ago

A good-quality measuring tape can be off by 0.42 cm over a distance of 28 m. What is its percent uncertainty? (Express your answ

Alecsey [184]

Answer:

0.015%

Explanation:

Data provided in the question:

Length by which the measuring tape can be off, δL = 0.42 cm

Total measured length for which Error of δL is observed, L = 28 m

Now,

we know,

1 m = 100 cm

Thus,

28 m = 28 × 100 = 2800 cm

Percent uncertainty = [δL ÷ L] × 100%

= [0.42 ÷ 2800] × 100%

= 0.015%

5 0

3 years ago