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STatiana [176]
2 years ago
8

Calculate Delta n (change in moles of gaseous substances) for each of the following balanced chemical equations...

Chemistry
1 answer:
Lerok [7]2 years ago
3 0
<span>2<span>C6</span><span>H6</span>O(l)+17<span>O2</span>−−>12C<span>O2</span>(g)+12<span>H2</span>O(l)</span>
<span>2S<span>O2</span>(g)+<span>O2</span>(g)−−>2S<span>O3</span>(g)</span>
<span><span>N2</span>(g)+<span>O2</span>(g)−−>2NO(g)</span>
<span>2Na(s)+B<span>r2</span>(l)−−>2NaBr(s)</span><span>
On the 1st 3 I have
12 -17 = -5
2 - 3 = -1
2 - 2 = 0
For the last one:
</span><span>Delta n=0</span><span>
</span>
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What lens could get dirty with oil if you move the revolving nosepiece in the wrong direction after viewing under oil immersion?
xxMikexx [17]

From what we know, we can confirm that doing this may dirty and cause harm to your 40x lens.

<h3 /><h3>Why would this cause harm to your lens?</h3>

Oil immersion is a technique that can be quite handy when attempting to view hard-to-see specimens. However, This should be done only with lenses that are made specifically for this, so revolving the nosepiece in the wrong direction will expose the 40x lens to the oil, for which it is not designed, and may cause harm to the equipment.

Therefore, we can confirm that the 40x lens could get dirty with oil if you move the revolving nosepiece in the wrong direction after viewing it under oil immersion.

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3 0
2 years ago
5 shown here are cartoons of two different polymers. based on these cartoons, which polymer would you expect to be denser? which
Angelina_Jolie [31]

Answer: The correct answer for a) Linear polymer with high density and high melting point and b) branched polymer with low density and low melting point

As the image is not attached , so I think it should be following image .

In the image , there are two types of polymers present . One polymer is long an unbranched , while other polymer is short and branched .

Polymers : These are giant molecules or repeating chains of small molecules formed by linking small molecules together by Carbon- Carbon covalent bonds .They are also called as " Macro molecules " . The process of formation of polymers is known as polymerization . The small molecules or the repeating units of a polymer are known as Monomers.

Polymers are produced naturally and can be synthesized artificially . Example of natural polymer are proteins , DNA etc and Artificial polymer are polyethylene , backelite etc.

Polymers are of various type based on their structure , linear , branched , cross linked . ( Describing following types of polymers based on image )

A) Linear polymers : These are long straight chain polymers like long string of Carbon -Carbon chain . These polymers when form , they fold back themselves like strands of fibre or mesh . They form very strong polymers .

They have well packed structures, due to which they have high intermolecular force of attraction . These high intermolecular force of attraction provide them high tensile strength and high density and hence they will have high melting point . It will be very difficult to break them .

Examples : Polyethene [-CH₂-CH₂-]n

Hence it can be said that a) box contains linear polymers and have high melting points and low densities.

B) Branched Polymers : These are linear polymers but have branches at regular intervals . These branches are known as side chains . The branches can be small or very long group . Branches polymers are also known as Dendrimers.

Due to branching , they cannot be closely packed . Branching prevents chain from getting close enough or to pack closely . Due to which they have low intermolecular forces . Hence they have low density and low tensile strength .So they have low melting points as well .

Examples : Glycogen , starch etc .

Since in image b) we can see the polymers have mall branches they can be assigned as " Branched polymers " and they will have low melting points and low densities.

7 0
3 years ago
2 moles Na = ______ atoms Na. I need help to figure out the number of atoms in Avogadro's number
Reil [10]

Answer:

12.044 x 10^23 atoms Na

Explanation:

1 mol Na has 6.022 x 10^23 atoms of Na

2 moles Na have 2 x NA = 2 x 6.022 x10^23 atoms Na

4 0
2 years ago
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MaRussiya [10]

Answer:

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5 0
2 years ago
When an irregularly shaped chunk of an unknown metal with a mass of 25.32 g was placed in a graduated cylinder containing 25.00
inn [45]

Answer: The density of the unknown metal is 7.86 g/ml.

Explanation:

Density is defined as the mass contained per unit volume.

Density=\frac{mass}{Volume}

Given : Mass of metal  = 25.32 g

Volume of metal = volume of water displaced = (28.22 - 25.00) ml = 3.22 ml

Putting in the values we get:

density=\frac{25.32g}{3.22ml}

Density=7.86g/ml

Thus the density of the unknown metal is 7.86 g/ml

7 0
3 years ago
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