CHEMISTRY MIDDLE SCHOOL

Explain why an empirical formula alone cannot be used to derive the actual molecular formula for a given compound. Provide one or more examples.

Answers

Answer 1
Answer:

The empirical formula tells the proportion of atoms or elements which are

present in a compound and not the exact number of atoms.

The molecular formula tells the exact number of atoms or molecules present

in a compound. An example is H₂0 which tells us that Hydrogen has two

atoms and oxygen has one.

Empirical formula talks about the proportion or ratio in which the molecules

are represented in the compound. This is however the major difference

between the both of them.

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Answer 2
Answer:

Answer:

Molecular formulas indicate how many atoms there are of each element in a compound, while empirical formulas indicate the reduced proportion of elements in a given compound. The molecular formula can be achieved through the empirical formula if the molecular weight of the compound is known, therefore the empirical formula alone cannot be used to obtain the molecular formula.

Explanation:

An empirical formula expresses the relative relationships of the different atoms in a given compound. For example, H2O is made up of two hydrogen atoms and 1 oxygen atom. In the same way, 1.0 mol of H2O is made up of 2.0 mol of hydrogen and 1.0 mol of oxygen. .

The molecular formula for a compound is always the empirical formula. The molecular formula can be obtained from the empirical formula if the molecular weight of the compound is known.

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What is a periodic element that is named after Einstein?

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einsteinium, atomic number 99
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What is meant by the word acid

Answers

an acid typically has a ph. of under 7 and neutralises alkali
noun1.a chemical substance that neutralizes alkalis, dissolves some metals, and turns litmus red; typically, a corrosive or sour-tasting liquid of this kind."rainwater is a very weak acid"2.CHEMISTRYa molecule or other entity that can donate a proton or accept an electron pair in reactions.adjective1.containing acid or having the properties of an acid; in particular, having a pH of less than 7."poor, acid soils"2.sharp-tasting or sour  that from google .

1) What is the mass of 5.24 moles of Fe504-7H2O?

Answers

Answer:

Ok; first of all, you must correct the Molecular Formula; FeSO4•7H20

So, work out the Molar Mass;,

(4x18)O+ 55.? Iron + 32 Sulphur, PLUS

(7x 18) H2O = 1 molar mass.

Now, take that times 5.24, show your work & check the Mol. Weights, I am going by memory.

Oxygen

Explanation:

Can I have an example of both a chemical and physical change happening at the same time. It can’t be a burning candle, burning wood, or food chewing and digestion.

Answers

Quick lime is calcium oxide. Itis an example of physical and chemical change.

Explanation:

  • The physical change is water turning into steam while heating.
  • It’s a chemical change. Quicklime is calcium oxide (CaO). When water is added to the calcium oxide, it is converted to calcium hydroxide in the reaction:

                                   CaO + H₂O -> Ca(OH)₂

  • In geology when earthen materials are exposed to water and are weakened or decomposed.
  • This process is referred to as slaking. Thus, calcium hydroxide resulting from the treatment of quicklime reacting with water form slaked lime.

How many moles of HCl are present in 0.70 L of a 0.33 M HCl solution?a
0.23 mol
Ob
0.38 mol
0.28 mol
Od
0.47 mol

Answers

Answer:

0.23 mol

Explanation:

Which statement best defines a universal law

Answers

The law of attraction in physics Newton's gravitational pull means to lie close to each other. In the field of physics of each object with mass m1 always have attractive forces with another object (with mass m2). For example, a particle with other particles will always mutual attraction. Examples put forward by Sir Isaac Newton in the field of classicalmechanics that anything on the atmosphere will be pulled by the earth,which was then known as the phenomenon of falling objects.

Attractive force of gravity is expressed by Isaac Newton viaWriting in the journal Philosophiæ Naturalis Principia Mathematica onJuly 5, 1687 in the form of the following formula:

    F = G \ frac {M_1 m_2} {r ^ 2},

Where:

    F is the force of gravity between the two masses,
    G is the gravitational konstante,
    m1 is the mass of the first object
    m2 is the mass of the object, and
    r is the distance between the two masses.

Thistheory is then developed further that any celestial body will be mutualattraction, and this could explain why the earth should revolve aroundthe sun to offset the attractive force of gravity of the earth-sun. Byusing the gravitational pull of this phenomenon as well, meteors closerto the Earth in its journey in space will be attracted fall to earth.
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