In what layer of the atmosphere does the International Space Station orbit?

Which element did Marie Curie name after her home country?

weqwewe [10]

Polonium after Poland hope this helps.

6 0

4 years ago

Read 2 more answers

How many grams of IRON are contained in a 245 gram sample of Fe2O3?

nlexa [21]

Answer:

$m_{Fe}=171.7gFe$

Explanation:

Hello!

In this case, since we have 245 of iron (III) oxide, we first need to compute the moles contained there:

$n_{Fe_2O_3}=245gFe_2O_3*\frac{1molFe_2O_3}{159.7gFe_2O_3} =1.54molFe_2O_3$

Now, as 1 mole of iron (III) oxide is related to 2 moles of iron, due to iron's subscript in the molecule, we get the moles of iron itself:

$n_{Fe}=1.54molFe_2O_3*\frac{2molFe}{1molFe_2O_3} =3.08molFe$

And the mass is computed based on the atomic mass of iron:

$m_{Fe}=3.08molFe*\frac{55.8gFe}{1molFe} \\\\m_{Fe}=171.7gFe$

Best regards!

7 0

3 years ago

Review Problem 5.040 For each reaction, identify in order the substance oxidized, the substance reduced, the oxidizing agent, an

alexandr402 [8]

Answer:

A. The correct option is: Cu; H₂SO₄; H₂SO₄; Cu

B. The correct option is: SO₂; HNO₃; HNO₃; SO₂

C. The correct option is: Zn; H₂SO₄; H₂SO₄; Zn

D. The correct option is: I₂; HNO₃; HNO₃; I₂

Explanation:

A chemical reaction that involves the simultaneous transfer of electrons between two chemical species is known as the redox reaction.

In this reaction, a species that gains electrons, thus getting reduced is called the oxidizing agent. Whereas, species that loses electrons, thus getting oxidized is called the reducing agent.

Oxidation refers to an increase in the oxidation state and reduction refers to a decrease in the oxidation state.

A. Cu + 2H₂SO₄ → CuSO₄ + SO₂ +2H₂O

In this reaction, Cu goes from 0 in Cu to +4 oxidation state in CuSO₄ and thus gets oxidized. Whereas, S goes from +6 in H₂SO₄ to +4 oxidation state in SO₂ and thus gets reduced. Therefore, H₂SO₄ is the oxidizing agent and Cu is the reducing agent.

The correct option is: Cu; H₂SO₄; H₂SO₄; Cu

B. 3SO₂ + 2HNO₃ + 2H₂O → 3H₂SO₄ + 2NO

In this reaction, S goes from +4 in SO₂ to +6 oxidation state in H₂SO₄ and thus gets oxidized. Whereas, N goes from +5 in HNO₃ to +2 oxidation state in NO and thus gets reduced. Therefore, HNO₃ is the oxidizing agent and SO₂ is the reducing agent.

The correct option is: SO₂; HNO₃; HNO₃; SO₂

C. 5H₂SO₄ + 4Zn → 4ZnSO₄ + H₂S +4H₂O

In this reaction, Zn goes from 0 in Cu to +2 oxidation state in ZnSO₄ and thus gets oxidized. Whereas, S goes from +6 in H₂SO₄ to -2 oxidation state in H₂S and thus gets reduced. Therefore, H₂SO₄ is the oxidizing agent and Zn is the reducing agent.

The correct option is: Zn; H₂SO₄; H₂SO₄; Zn

D. I₂ + 10HNO₃ → 2HIO₃ + 10NO₂ + 4H₂O

In this reaction, I goes from 0 in I₂ to +5 oxidation state in HIO₃ and thus gets oxidized. Whereas, N goes from +5 in HNO₃ to +4 oxidation state in NO₂ and thus gets reduced. Therefore, HNO₃ is the oxidizing agent and I₂ is the reducing agent.

The correct option is: I₂; HNO₃; HNO₃; I₂

8 0

4 years ago

A neutral atom has the following characteristics atomic number 16 atomic mass 32 determine the value of this atoms electrons pro

raketka [301]

Atomic number = # of protons (or electrons). Atomic mass= # of protons + # of neutrons, therefore, protons=16, electrons=16 & neutrons=16

8 0

3 years ago

5. What is the overall charge of the electron cloud of the atom?Explain

Basile [38]

The answer is: The overall charge of the electron cloud is negative,

Electron: Electron is a sub-atomic particle which is found outside the nucleus of an atom. The charge carried by an electron is negative.

What is the electron cloud and who suggest this idea?

Erwin Schrödinger developed electron cloud model.
He suggested that atoms have a central nucleus made up of protons and neutrons. Around it is the "probability region" where electrons are most likely to be found.
The higher the density, the more likely the electron will be found in this region.
This dense probability region is called an electron cloud.
As this region carries only negatively charged electrons, thus the overall charge of the electron cloud is negative.

To learn more about electrons and electron cloud, visit:

brainly.com/question/2437516

#SPJ9

8 0

2 years ago