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Elina [12.6K]
3 years ago
11

“A mixture is the chemical bonding of two or more substances in any proportion.” Is this statement true or false? Explain your a

nswer.
Chemistry
2 answers:
andrezito [222]3 years ago
8 0

Answer:

False

Explanation:

''A mixture is the chemical bonding of two or more substances in any proportion'' is false statement because a mixture don't include bonding of chemical substances.  

Mixtures in chemistry are including <u>blending</u> of substances and we have two tipes of mixture:

  1. Heterogeneous
  2. Homogeneous

Some of the chemical mixtures are: mixture of water and sand, mixture of sand and iron filings and more...

If we are talking about bonding in chemistry there are Covalent bonds and Ionic bonds.

ehidna [41]3 years ago
3 0

<u>Answer:</u>

<em>The statement is False. </em>

<u>Explanation:</u>

A mixture contains two or more elements present in it.

The elements are not in chemical combination with each other.

A compound too contains two or more elements but they are in chemical combination.

For example NaCl  is a compound which contains 1 part of Sodium and 1 part of Chlorine.

H_2 O is a compound 2g of hydrogen is chemically combined with 16g of Oxygen.

Chemical bonding is the attractive forces  which holds the atoms together in a molecule.

NaCl - the attractive force is called as Ionic bond.

H_2 O - the bond present is a covalent bond

A mixture has two or more elements but there is no chemical bonding present in it. The components of a mixture can be easily separated from it.

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What is the energy change if 84.0 g of calcium oxide (CaO) reacts with excess water in the following reaction?
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   The energy change  if 84.0 g   of CaO  react  with  excess  water is  98KJ of heat is released.

calculation
heat  =  number of moles  x  delta H

delta H = - 65.2  Kj/mol

first find the number of  moles  of  CaO reacted

moles = mass/molar mass
the molar mass  of CaO =  40 +  16=  56 g/mol
mass = 84 g
moles therefore = 84 g/56 g/mol =1.5 moles

Heat is therefore =  1.5 moles  x -65.2 = - 97.8 Kj = -98 Kj

  since  sign is  negative  the   energy  is released 

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We balance the given reactions above by following the rules in balancing redox reactions in acidic or basic solutions. Balance the atoms aside from the O and H atoms. Then we balance the Os and Hs by adding H2O or H+. Finally, we balance the total charge of the reactant and product by adding e-. We do as follows:

<span>A) H2O2 + Fe 2+ ---> Fe 3+ + H2O (in the acidic solution)
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<span>
C) CN- + MnO4- ---> CNO- +MnO2 (in basic solution)
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<span>
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    6e- + 4H+ + 2S2O2/3- + I2 ---> 2I- + S4O2/6- + 2H2O

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