What type of relationship exists between birds and trees

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

According to _________ Law, the volume of a fixed amount of gas at a constant pressure varies directly with its absolute tempera

Dmitrij [34]

The answer would be Boyle’s law

7 0

3 years ago

What property do all of the group 18 elements have that make them stand out from other elements?

matrenka [14]

They are very stable (not reactive).

This is because their outer shell has a total of 8 valence electrons. All elements strive to get towards a full outer shell, but since these elements already have a full outer shell, they are fairly unreactive.

5 0

3 years ago

CALCULATE: Determine the volume occupied by 0.582 mol of a gas at 15 degrees Celsius if the pressure is 81.8 KPA?

7nadin3 [17]

PV=nRT

So

NRT/P=V ...
SI units for pressure is pascals so 81.8KPA = 81.8 x 10^3 PA
SI units for temperature is kelvin so 15 degrees celsius = 15 +273 = 288K

(0.582 x 8.314 x 288)/81.8 x 10^3 = 0.017 m3 (cubic meters)

8 0

3 years ago

Is a forward or reverse reaction favored?

Alex Ar [27]

Answer:

(a) $CH_3COOH \rightleftharpoons CH_3COO^-+ H^+$ : reverse reaction is favored.

(b) $AgCl \rightleftharpoons Ag^+ + Cl^-$ : reverse reaction is favored.

(c) $Al(OH)_3 \rightleftharpoons Al^{3+} + 3OH^-$ : reverse reaction is favored.

(d) $A+B\rightleftharpoons C$ : forward reaction is favored.

Explanation:

Hello,

(a) $CH_3COOH \rightleftharpoons CH_3COO^-+ H^+$ :

In this case, since the Ka is lower than 1, we infer the reverse reaction is favored since the reactant (acetic acid) will tend to have a higher concentration.

(b) $AgCl \rightleftharpoons Ag^+ + Cl^-$ :

In this case, since the Ka is lower than 1, we infer the reverse reaction is favored since the reactant (silver chloride) will tend to have a higher concentration.

(c) $Al(OH)_3 \rightleftharpoons Al^{3+} + 3OH^-$

In this case, since the Ka is lower than 1, we infer the reverse reaction is favored since the reactant (aluminium hydroxide) will tend to have a higher concentration.

(d) $A+B\rightleftharpoons C$

In this case, since the Ka is greater than 1, we infer the forward reaction is favored since the product (C) will tend to have a higher concentration.

Regards.

6 0

3 years ago