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4 years ago

Explain how the liquid in a thermometer changes so that it can be used to measure a temprature

Chemistry

1 answer:

mart [117]4 years ago

5 0

Answer:

The liquid that is often used in thermometers is chrome.

It is khwon for raising its volule when the temperature raises and vice-versa. ● the temperature and the volume are proprtional to each other so using Mathematics, scientists have figured out a way to benefit from it to make a thermometer.

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If 50.0 g of silicon dioxide is heated with an excess of carbon, 27.9 g of silicon carbide is produced. What is the percent yiel

Molodets [167]

Answer: The percent yield of the reaction is 83.5 %

Explanation:

The given balanced equation is

$SiO_2+3C\rightarrow SiC+2CO$

$SiO_2$ is the limiting reagent as it limits the formation of product and $C$ is the excess reagent.

According to stoichiometry :

60.08 g of $SiO_2$ produce = 40.11 of $SiC$

Thus 50.0 of $SiO_2$ will produce= $\frac{40.11}{60.08}\times 50.0=33.4$ of $SiC$

Experimental yield of SiC = 27.9 g

Percent yield = $\frac{\text {Experimental yield}}{\text {theoretical yield}}\times 100=\frac{27.9g}{33.4g}\times 100=83.5\%$

Thus percent yield of the reaction is 83.5 %

6 0

3 years ago

Enter the balanced complete ionic equation for HCl(aq)+K2CO3(aq)→H2O(l)+CO2(g)+KCl(aq)

Inga [223]

Answer:

2HCl(aq)+K2CO3(aq)→H2O(l)+CO2(g)+2KCl(aq)

Explanation:

HCl(aq)+K2CO3(aq)→H2O(l)+CO2(g)+KCl(aq)

2HCl(aq)+K2CO3(aq)→H2O(l)+CO2(g)+2KCl(aq)

H-1*2=2 H-2

Cl-1*2=2 Cl- 1*2=2

K -2 K-1*2=2

C- 1 C-1

O - 3 O-3

6 0

3 years ago

The sum of gravitational potential energy and kinetic

Firlakuza [10]

Answer:

Explanation:

Mechanical energy = Gravitational potential energy + kinetic energy

Time Gravitational potential energy kinetic energy Total ME

0 4 0 4

2 2 2 4

4 0 4 4

6 2 2 4

8 4 0 4

and so on .....

We see that total mechanical energy is always 4 which is constant .

So gravitational and kinetic energy changes cyclically but total mechanical energy is constant .

7 0

3 years ago

Copper sulfate is a blue solid that is used to control algae growth. Solutions of copper sulfate that come in contact with the s

xenn [34]

Answer:

185.5156 g

Explanation:

The reaction of copper sulfate with zinc is shown below as:

$CuSO_4+Zn\rightarrow ZnSO_4+Cu$

Given that :

Amount of copper sulfate = 454 g

Molar mass of copper sulfate = 160 g/mol

The formula for the calculation of moles is shown below:

$moles = \frac{Mass\ taken}{Molar\ mass}$

Thus, moles are:

$moles= \frac{454\ g}{160\ g/mol}$

$moles\ of\ copper\ sulfate= 2.8375\ mol$

From the reaction,

1 mole of copper sulfate reacts with 1 mole of zinc

Thus,

2.8375 moles of copper sulfate reacts with 2.8375 moles of zinc

Moles of Zinc that should react = 2.8375 moles

Mass of zinc= moles×Molar mass

Molar mass of zinc = 65.38 g/mol

Mass of zinc = 2.8375 ×65.38 g = 185.5156 g

8 0

3 years ago

What is the iupac name of:

exis [7]

Explanation:

saturated hydrocarbon

7 0

3 years ago