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3 years ago

The reaction for the combustion of methane is shown below. If 28.70g of methane

Chemistry

1 answer:

antiseptic1488 [7]3 years ago

8 0

Omg hard question but it’s also amazing imma think about that question

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At what temperature will aluminum have a resistivity that is three times the resistivity of tungsten at room temperature? (Assum

umka2103 [35]

Explanation:

At room temperature, resistivity of tungsten is $5.6 \times 10^{-8}$ and the resistivity of aluminium is $2.8 \times 10^{-8}$ .

Temperature coefficient of aluminium ( $\alpha$ ) = $3.9 \times 10^{-3}$

$R_{a} = 3R_{c} = 5.1 \times 10^{-8} \ohm m$

and, $R_{a} = R_{o}(1 + \alpha \times \Delta T)$

= $2.82 \times 10^{-8} (1 + 3.9 \times 10^{-8} \times \Delta T)$

$\Delta T = 207.3^{o}C$

T = $(207.3 + 20)^{o}C$

= $227.3^{o}C$

So, at $227.3^{o}C$ aluminium has resistivity which is three times the resistivity of tungsten at room temperature.

3 0

3 years ago

What happens to a sheet of copper as the average kinetic energy of the copper molecules decreases?

JulsSmile [24]

Answer:

<h2>It gets cooler.</h2>

Explanation:

<h2>Hopes this helps. Mark as brainlest plz!</h2>

8 0

3 years ago

Read 2 more answers

Ocean water contains 3.5 nacl by mass. what mass of ocean water in grams contains 45.8 g of nacl

Romashka-Z-Leto [24]

Mass percentage of sodium chloride(NaCl) in ocean waters = 3.5 %

That means 3.5 g sodium chloride(NaCl) is present for every 100 g of ocean water.

The given mass of sodium chloride(NaCl) is 45.8 g

Calculating the mass of ocean waters that would contain 45.8 g sodium chloride(NaCl):

$45.8 g NaCl *\frac{100g ocean water}{3.5g NaCl}$

= 1309 g ocean water

Therefore, 45.8 g sodium chloride is present in 1309 g ocean water.

3 0

4 years ago

How many valence electrons does an atom of al possess?

Irina18 [472]

Answer:

Explanation:

Third element to right

3 0

3 years ago

Chlorine and potassium atoms form ionic bonds, carbon atoms form non-polar covalent bonds with nitrogen atoms, and oxygen forms

Ray Of Light [21]

Explanation:

A covalent bond is formed when an element shares its valence electron with another element. This bond is formed between two non metals.

An ionic bond is formed when an element completely transfers its valence electron to another element. The element which donates the electron is known as electropositive element and the element which accepts the electrons is known as electronegative element. This bond is formed between a metal and an non-metal.

Chlorine and potassium atoms form ionic bonds: Ionic bond is formed when there is complete transfer of electron from a highly electropositive metal to a highly electronegative non metal. Electronegativity difference = electronegativity of chlorine - electronegativity of potassium = 3-0.8 = 2.2

Carbon atoms form non-polar covalent bonds with nitrogen atoms : Non-polar covalent bond is defined as the bond which is formed when there is no difference of electronegativities between the atoms. Electronegativity difference = electronegativity of nitrogen - electronegativity of carbon= 3.0-2.5 = 0.5

Oxygen forms polar covalent bonds with phosphorus: A polar covalent bond is defined as the bond which is formed when there is a difference of electronegativities between the atoms. Electronegativity difference = electronegativity of oxygen - electronegativity of phosphorous = 3.5- 2.19 = 1.31

5 0

3 years ago