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mamaluj [8]
3 years ago
10

What is a chemical change and what is a chemical property? Give Example.

Chemistry
2 answers:
nordsb [41]3 years ago
8 0
Look it up on google
White raven [17]3 years ago
4 0
Physical changes<span> are the changing in the physical state of the substance. The physical </span>change can be melting, evaporation, or boiling, but during a chemical reaction<span> the atoms within a substance are rearranged into different combinations. For </span>example<span>, sugar undergoes a </span>chemical change<span> when it is cooked to make caramel.</span>
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How many atoms does Iron oxide have?
ArbitrLikvidat [17]
Added together = 159.7 grams for one mole of Fe2O3<span>. That is moles of hematite, but the question is about iron. We can see there are </span>two<span> iron atoms for every hematite molecule. So the number (moles) of iron atoms is twice the moles of the hematite molecules. 

so depending on how much you initially have will determine the answer</span>
7 0
3 years ago
Which best explains why ionization energy tends to decrease from the top to the bottom of a group? The number of orbitals decrea
cluponka [151]

Answer:

Electrons get farther from the nucleus.

Explanation:

By going from the top to the bottom of a group, the atomic number increases. That would mean that:

  • The number of orbitals increases, as there are more electrons.
  • A higher atomic number implies an increasing number of neutrons.
  • As there are more electrons, they get farther from the nucleus. The farther an electron is from the nucleus, the easier it is for the electron to be removed from the atom.
4 0
3 years ago
If a red blood cell is 100% saturated, how many molecules of O2 are bound to it?1 billion molecules of O24 molecules of O2250 mi
kondor19780726 [428]

Answer:

1 billion molecules O₂

Explanation:

From my research, a human red blood cell contains approximately 270 million hemoglobin molecules.    

A hemoglobin molecule contains four heme groups, <em>each of which has an iron ion forming a coordination complex that carries every dioxygen molecule. </em>Therefore for each hemoglobin molecule, we will have 4 dioxygen molecules. The heme groups are responsible for the transport of every dioxygen and other diatomic gases.                    

Hence, the number of O₂ molecules in a red blood cell saturated with 100% will be:                

\frac{270 \cdot10^{6} hemoglobine molecules}{1 red blood cell} \cdot \frac{4 heme group}{1 hemoglobine molecule} \cdot \frac{1 O_{2} molecules}{1 heme group} = 1 \cdot 10^{9} O_{2} \frac{molecules}{red blood cell}

So, the correct answer is 1 billion of O₂ molecules.  

Have a nice day!

8 0
3 years ago
What element in the second period has the largest atomic radius?
madreJ [45]

Answer:

b. lithium

Explanation:

furthest to the left in second period

3 0
3 years ago
As the Amplitude of the wave decreases what be does the frequency do​
Alexxx [7]

Answer: pic of the test

Explanation:

4 0
2 years ago
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