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Gre4nikov [31]
3 years ago
10

Lead oxide is formed when a lead cation that has a charge of 2+ combines with an oxygen anion that has a charge of 2-. Using the

crisscross method, write the formula for lead oxide.

Chemistry
2 answers:
hjlf3 years ago
7 0

Answer : The formula for lead oxide is, PbO

Explanation :

As we know that the lead is a metal having the atomic number 82. The symbol of lead is, (Pb). The charge on lead is (+2).

The element oxygen is the non-metal having the atomic number 8. The symbol of oxygen is, (O). The charge on oxygen is, (-2).

When the lead combine with the oxygen, it forms lead oxide. It is an ionic compound in which the a metal react with the non-metal and combine with the an ionic bond by the criss-cross method.

Hence, the formula of the lead oxide is, PbO

adell [148]3 years ago
4 0
PbO
Not sure how to show crisscross method
Make sure adding the charges together=0 and multiply the elements when necessary to balance charge
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Help me with this attachment please​
Anna007 [38]

Answer:

See explanation

Explanation:

Let us recall that the basic rule in writing balanced chemical reaction equations is that the number of atoms of each element on the right hand side of the reaction equation is the same of the number of atoms of the same element on the left hand side of the reaction equation.

The reaction of red hot iron and steam is written as follows;

3Fe + 4H2O → Fe3O4 + 4H2.

The decomposition reaction of ammonium dichromate is written as;

(NH4)2Cr2O7 → N2 + Cr2O3 + 4H2O

Reaction of aluminium, sodium hydroxide and water is as follows,

2Al + 2NaOH + 2H2O ----> 2NaAlO2 + 3H2

Reaction of potassium bicarbonate with sulphuric acid;

2KHCO3 + H2SO4 -------> K2SO4 + 2H2O + 2CO2

Reaction of zinc and sodium hydroxide is as follows;

Zn + 2NaOH→Na2ZnO2 + H2

5 0
3 years ago
Explain how scientists know the oxygen level in the atmosphere has changed because of plants. Could our atmosphere still be chan
alukav5142 [94]

Answer:

Kya hova be Tera question koi nahi btaye ga

4 0
3 years ago
Is graph paper a homogeneous or heterogeneous mixture
labwork [276]

Answer:

There is no chemical symbol for paper since it is not an element but rather a mixture of several different compounds. Mixtures in two or more phases are heterogeneous mixtures.

Explanation:

4 0
3 years ago
What element does this model represent?
AleksandrR [38]

Answer:

$\tex$ Option 2: Aluminum (Al)

Explanation:

When we are given Bohr models, we will be given a circle with rings surrounding it. The circle in the center of the model represents the nucleus, which contains the neutrons and the protons. The rings will have spherical structures that are attached to them in an orderly fashion - these model the electrons of an atom.

  • Protons are positively-charged subatomic particles that also identify the atom's chemical identity and atomic number. Using the number of protons, we are able to identify the element.
  • The neutrons are the neutrally-charged subatomic particles that give an atom its weight. When you look at a traditional periodic table, you'll see that the square that houses an element has its symbol, atomic number, and atomic mass. The atomic mass is equivalent to the sum of the protons and neutrons.
  • Electrons are negatively-charged subatomic particles that give an atom its overall charge. In order for an atom to be stable and neutral, the electrons <u>must</u> equal the protons. Otherwise, we have an unstable atom called an ion with either a positive or a negative charge. This is dependent on whether an atom has gained or lost electrons.

When we reference the model, we will see that there are 13 "p" and 14 "n" within the green circle. The "n" refers to <em>neutrons </em>and the "p" refers to <em>protons</em>. We can also count the red spheres and make quick observations about these: there are 2 red spheres on the innermost ring - for simplicity reasons, we will title this ring as r = 1. There are 8 red spheres on the middle ring - this ring will be titled r = 2. Finally, we can see that there are 2 more electrons in the outermost ring - this ring will be titled r = 3.

Now, because we have 13 protons, we know that the protons are equivalent to the atomic number.

  1. If we check the periodic table, we will see that Silicon (Si) has an atomic number of 14. This doesn't match the number of protons, so we can rule out that a silicon atom is not the element shown.
  2. When we use the same process and check aluminum, we discover that Aluminum (Al) has an atomic number of 13. Since the number of protons and the atomic number are equal, we can conclude that this is the element.
  3. If we check Helium (He), we see that it has an atomic number of 2, so this is definitely not our element in question.

Now that we have concluded that Aluminum is our element, we can check this to be sure. If we use the formula m = n + p (where m is the atomic mass, n is the neutrons, and p is the protons), we can check to be sure we have selected the right element.

The given mass of aluminum on the periodic table is 26.982 atomic mass units. We round to the nearest integer when it comes to this, so we round 26.982 up to 27 even.

Now that we have determined the atomic mass and we are given the number of both protons and neutrons, we can act as if we weren't given the amount of neutrons and only the mass and amount of protons. We can then use the equation to solve for the amount of neutrons and check that the selection we made is correct.

<u>Steps</u>

  1. Substitute 27 for <em>m</em> and 13 for <em>p</em>.
  2. Subtract 13 from both sides to isolate the <em>n</em> and place the constants on the same side of the equation.
  3. Combine like terms by taking the appropriate operations (in this case, this is subtracting 13 from 27).
  4. Finally, because we are solving for <em>n</em>, you can reverse the equation (place the constant on the right and place the variable on the left; i.e., 72 = x  →  x = 72).

27 = n + 13\\\\27 - 13 = n\\\\14 = n\\\\n = 14

The work we just performed will allow us to confirm that because we solved for <u>14 neutrons</u>, Aluminum (Al) is indeed the element represented by the model.

Hope this helps! :)

5 0
3 years ago
How many hydrogen moles are in 2.5 moles of aspartame c14h18n2o5
STALIN [3.7K]
Firstly, we need to convert 3g aspartame into moles aspartame. In order to do this we have to find the molecular mass of aspartame (the total weight of each atom of the molecule combined. This figure can be used to construct a conversion factor so that the grams may be converted into moles. Molecular weights for each atom can be found on any periodic table. Avagadro's number (6.022*10^23) is a constant value that expresses the number of molecules in one mole of a substance. 

The molecular weight for aspartame is 294.3 grams per mole. 

The process of finding how many atoms of H there are in 3.00g of aspartame would be like this: 

1. 3g * 1mol/294.3g = .01mol aspartame (this is converting grams to moles) 

2. .01mol * 6.022*10^23 = 6.022*10^21 (This is finding the number of molecules) 

3. (6.022*10^21) * 18 = 1.08*10^23 

This 3rd calculation is done because in part 2, you calculated the number of molecules of aspartame there were in 3g. In each molecule of aspartame there are 18 hydrogen atoms. So the final answer is: 
1.08*10^23 hydrogen atoms.
3 0
3 years ago
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