Ask question

Ask question

All categories

3 years ago

5

Two fossils with reptilian characteristics are part of a shipment of fossils sent to a museum. The only difference is that one o

f the fossils shows evidence that the organism had feathers. Which fossil is probably older and why?

1 answer:

SOVA2 [1]3 years ago

5 0

The one with feather. because it was probably form the Dino era

You might be interested in

4.2g of cerium reacted with oxygen to form 5.16g of an oxide of cerium. Find

olganol [36]

Answer:

CeO₂

Explanation:

Hello!

In this case, since we are given the mass of both cerium and the cerium oxide, we can first compute the moles of cerium and the moles of oxygen as shown below:

$n_{Ce}=4.2gCe*\frac{1molCe}{140.12gCe}=0.03molCe\\$

$m_O=5.16g-4.2g=0.96gO\\\\n_O=0.96g*\frac{1molO}{16.0gO} =0.06molO$

Now, we simply divide each moles by 0.03 as the fewest moles in the formula to obtain the simplest formula (empirical formula) of this oxide:

$Ce=\frac{0.03}{0.03}=1\\\\O =\frac{0.06}{0.03}=2$

Thus, the formula turns out:

$CeO_2$

Regards!

6 0

2 years ago

The number of protons in a neutral atom is balanced by an equal number of

anastassius [24]

There would be an equal amounts of ELECTRONS.

In order for the atom to be neutral it would imply that the number of protons (positive particles) and the number of electrons (negative particles) are equal since the neutrons are without charge.

3 0

3 years ago

In which of the following cases will the LEAST time be required to arrive at equilibrium? K below refers to the equilibrium cons

mylen [45]

Answer: Option (4) is the correct answer.

Explanation:

It is known that equilibrium constant is represented as follows for any general reaction.

$A + B \rightarrow C + D$

K = $\frac{[C][D]}{[A][B]}$

As equilibrium constant is directly proportional to the concentration of products so more is the value of equilibrium constant more will be the number of products formed.

As a result, more is the time taken by the reaction to reach towards equilibrium. Whereas smaller is the value of equilibrium constant more rapidly it will reach towards the equilibrium.

Thus, we can conclude that cases where K is a very small number will require the LEAST time to arrive at equilibrium.

8 0

3 years ago

What was the result of the atomic theory?

Cerrena [4.2K]

Answer:

The result of the atomic theory was atomic theory proposed that all matter was composed of atoms, also postulated that chemical reactions resulted in the rearrangement of the reacting atoms.

4 0

3 years ago

Would someone please help?

sveta [45]

The season that is starting is winter.
The answer to 21 is (4)

3 0

3 years ago