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3 years ago

Polonium-208 undergoes alpha decay. In addition to the alpha

Chemistry

2 answers:

Yanka [14]3 years ago

7 0

Answer:

Explanation:

DaniilM [7]3 years ago

5 0

Answer: it's C

204/82PB

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Endothermic creatures maintain fairly consistent body temperatures. Ectothermic creatures do not. What are the best synonyms for

Ghella [55]

Endothermic- endothermal, heat absorbing
Ectothermic- exothermal exoergic energy releasing, heat releasing

4 0

4 years ago

A solution contains only sucrose and water. If the mole fraction of sucrose is 0.0558, determine the molality of sucrose.

lora16 [44]

Answer:

The correct solution is "3.28 m".

Explanation:

According to the question,

Mol fraction of solvent,

= 0.0558

Molar mass of water,

= 18 g/mol

Mol of H₂O in 1000 g water,

= 55.55 mol

Now,

Let the mol of solute will be "x mol".

Total mol in solution will be "55.55 + x".

As we know,

⇒ The mol fraction of solvent = $\frac{x}{55.55+x}$

$0.0558=\frac{x}{55.55+x}$

$x=0.0558[55.55+x]$

$x=3.09969+0.0558x$

$x-0.0558x=3.09969$

$x=\frac{3.09969}{0.9442}$

$=3.38 \ m$

5 0

3 years ago

The decomposition of dinitrogen pentoxide, N2O5, to NO2 and O2 is a first-order reaction. At 60°C, the rate constant is 2.8 × 10

Ugo [173]

Answer:

The correct option is a.

Explanation:

$2N_2O_5\rightarrow 4NO_2 + O_2$

125 kPa

125kpa - 2x 4x x

Total pressure after reaction = 176 kPa

125 kPa - 2x + 4x + x = 176 kPa

x = 17

125 kpa - 2x = 125 kPa - 2(17) = 91 kPa

Initial pressure of the dinitrogen pentoxide ,(at t=0) = $P_o= 125 kPa$

Final pressure of the dinitrogen pentoxide, (at t = t) = P = 91 kPa

The rate constant is = $k = 2.8\times 10^{-3} min^{-1}$

$t=\frac{2.303}{k}\log\frac{P_o}{P}$

$t=\frac{2.303}{2.8\times 10^{-3} min^{-1}}\log\frac{125 kPa}{91 kPa}$

$t=113.3969 minutes\approx 113 minutes$

It will take 113 minutes for the total pressure to reach 176 kPa.

8 0

3 years ago

What is the order of discovery of the three subatomic particles

masya89 [10]

Protons, neutrons, and electrons are the three main subatomic particles found in an atom. Protons have a positive (+) charge. An easy way to remember this is to remember that both proton and positive start with the letter "P." Neutrons have no electrical charge.

thats what i found for you!

3 0

3 years ago

Question 5

bagirrra123 [75]

Answer:

true

Explanation:

any object that is larger will take a longer time to do things, the same applies to heat levels. The lower the heat, the longer it takes, the higher the heat, the shorter it takes. So if an iceberg is large, it will need a higher heat, whereas an ice cube is really small and doesn't need that much heat to melt.

3 0

3 years ago