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3 years ago

Explain the reason that maps must change over time

Chemistry

2 answers:

Kamila [148]3 years ago

6 0

Answer:

Maps must change over time as the geographical structures change from time o time. The roads and highways also change often due to the development activities .

dusya [7]3 years ago

4 0

Explanation:

Because the place on the map can be changed to another shape by natural effects like faulting,folding , volcanism

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Chlorine is used to make bleach solutions containing 5.25% NaClO (by mass). Assuming 100% yield in the reaction producing NaClO

Archy [21]

To make 1000. L of bleach solution 1.69×10⁴ L of Cl₂(g) at STP will be needed .

<h3>What is Balanced chemical equation?</h3>

A balance chemical equation is an equation that contain same number of atoms as well as of each element on each side of reaction.

<h3>What is Density?</h3>

It is ratio of mass to the volume.

Density= $\frac{Mass}{Volume}$

Now,

The balanced chemical equation of preparing bleach from chlorine is as follow:

Cl₂(g) + 2NaOH(aq) → NaClO(aq) + NaCl(aq) + H₂O(l)

Now,

To calculate the Moles of NaClO in 1000L solution, first calculate it's mass.

Mass of NaClO = Density × Volume

= 1.07 $\frac{g}{ml}$ × 1000L × $\frac{1000mL}{1L}$ × $\frac{5.25}{100}$

= 56175g

Now, we have to calculate moles of NaClO

Hence,

Moles of NaClO = $\frac{amount of NaClO}{molar mass of NaClO}$

= $\frac{56175g}{74.44\frac{g}{mol} }$

= 754.63 mol

Now,

According to the reaction number of moles of Cl₂ is equal to the number of moles of NaClO.

Hence,

moles of Cl₂ = 754.63 mol

Now , in order to calculate litres of Cl₂ at STP,

We know that

1 mol Cl₂ = 22.4 L of Cl₂

754.63 mol of Cl₂ = 754.63 mol × 22.4 L

= 1.69×10⁴ L of Cl₂

Thus from the above conclusion we can say that , to make 1000. L of bleach solution 1.69×10⁴ L of Cl₂(g) at STP will be needed .

Learn more about Balanced Chemical Equation here:brainly.com/question/27135494

#SPJ4

5 0

2 years ago

A student says that all pure substances are elements. Do you agree? Why or why not? Question 14 options:I disagree. Elements fo

LenaWriter [7]

Answer: I disagree. Elements form all pure substances, but some pure substances include elements bonded together to form molecules and compounds.

Explanation:

Pure substances are those that have a uniform and constant (invariable) composition.

That condition is met by both elements and compounds.

Elements are pure substances of one only kind of atoms. For example, gold, oxygen, sodium, hydrogen, are pure substances that arer elements. There are 118 elements known and they are all listed in the periodic table.

Compounds are pure substances formed by two or more different kind of atoms. Water (H₂O), table salt (NaCl), and ethanol (CH₃-CH₂OH), are examples of pure substances that are compounds. There are pratically infinite different compounds.

In conclusion, compounds are also pure substances, since every sample of a given compound has always the same kind of elements bonded in the same way.

4 0

3 years ago

Read 2 more answers

An atom of oxygen (atomic number 8) has a mass number of 17. How many neutrons are<br> in that atom?

ludmilkaskok [199]

<h2>Answer: # of neutrons = 9</h2>

<h3>Explanation:</h3>

# of neutrons = mass number - atomic number

= 17 - 8

= 9

<h3>∴ number of neutrons in an atom of oxygen of mass number 17, is 9.</h3>

3 0

3 years ago

To determine the concentration of a sample of calcium hydroxide, 1.45M HCl is added drop-wise using a burst. Write the balanced

GenaCL600 [577]

Answer:

H^+(aq) + OH^-(aq) —> H2O(l)

Explanation:

We'll begin by writing the balanced equation for the reaction.

2HCl(aq) + Ca(OH)2(aq) —> CaCl2(aq) + 2H2O(l)

Ca(OH)2 is a strong base and will dissociates as follow:

Ca(OH)2(aq) —> Ca^2+(aq) + 2OH^-(aq)

HCl is a strong acid and will dissociates as follow:

HCl(aq) —> H^+(aq) + Cl^-(aq)

Thus, In solution a double displacement reaction occurs as shown below:

2H^+(aq) + 2Cl^-(aq) + Ca^2+(aq) + 2OH^-(aq) —> Ca^2+(aq) + 2Cl^-(aq) + 2H2O(l)

To get the net ionic equation, cancel out Ca^2+ and 2Cl^-

2H^+(aq) + 2OH^-(aq) —> 2H2O(l)

H^+(aq) + OH^-(aq) —> H2O(l)

7 0

3 years ago

The morning temperature in a city is 41°F. If a sunny, mild day is forecast, which temperature is most likely for 2:00 p.m.?

romanna [79]

Answer:

huh

Explanation:

5 0

3 years ago