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3 years ago

What is the density of an object that has a mass of 20g and a volume of 10 cc?

Chemistry

1 answer:

Alexxandr [17]3 years ago

5 0

i believe
2 g/mL
good luck!

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Charcoal from the dwelling level of the Lascaux Cave in France gives an average count of 0.97 disintegrations of ^14 C per minut

Verdich [7]

Answer:

Explanation:

count given by old sample = .97 disintegrations per minute per gram

count given by fresh sample = 6.68 disintegrations per minute per gram

Half life of radioactive carbon = 5568 years

rate of disintegration

dN / dt = λ N

In other words rate of disintegration is proportional to no of radioactive atoms present . As number reduces rate also reduces .

Let initial no of radioactive be N₀ and after time t , number reduces to N

N₀ / N = 6.68 / .97

Now

$N=N_0e^{-\lambda t}$

$\frac{N}{N_0} =e^{-\lambda t}$

$\frac{6.68}{.97} = e^{\lambda t}$

λ is disintegration constant

λ = .693 / half life

= .693 / 5568

= .00012446 year⁻¹

Putting the values in the equation above

$\frac{6.68}{.97} = e^{.00012446\times t}$

$6.8866 = e^{.00012446\times t}$

1.929577 = .00012446 t

t = 15503.6 years .

4 0

3 years ago

When a metal and a non-metal react, the ____ tends to lose electrons and the ____ tends to gain electrons?

valentina_108 [34]

<span>When a metal and a non-metal react, the metal tends to lose electrons and the non metal tends to gain electrons?</span>

8 0

3 years ago

Is the electron configuration 1s22s22p5 for Oxygen correct?

joja [24]

No that’s is the electronic configuration for fluorine.

7 0

3 years ago

Which of the following are properties of mechanical waves? (pick more than 1)

Tamiku [17]

Answer:

I'd say ALL OF THE ABOVE.

A Mechanical wave is a disturbance that transfers energy as it moves through a medium without displacement of the medium itself.

It can Either be Transversal or Longitudinal.

It is Transversal when the particles of the medium move perpendicular to the wave motion.

It requires a medium and begin at a source with a disturbance

ALL THE OPTIONS SEEM LEGIT.

7 0

3 years ago

How many grams of nacl are produced when 80.0 grams of o2 are produced?

expeople1 [14]

97.5g NaCl will be produced with 80.0g of O2

4 0

4 years ago