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3 years ago

Which term refers to an element that conducts electricity at high temperatures, but not at low temperatures?

2 answers:

4 0

Answer: metal

Explanation: it says element so conductor and semiconductor are out and a halogen is a group of gases on the periodic table so this brings up to a conclusion of metal.

NOTE: I am not a professional***

Anuta_ua [19.1K]3 years ago

4 0

semiconductor

This is the answer

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A cylindrical glass tube 12.7 cm in length is filled with mercury (density =13.6 g/mL). The mass of mercury needed to fill the t

Kay [80]

Answer:

The inner diameter of the tube is 0.4410 cm.

Explanation:

Height upto which mercury is filled = 12.7 cm

Mass of mercury = 105.5 g

Density of mercury = 13.6 g/mL = $13.6 g/cm^3$

Volume of mercury:

$\frac{Mass}{Density}=\frac{105.5 g}{13.6 g/cm^3}=7.7573 cm^3$

A mercury in cylindrical glass tube is at height of 12.7 cm.

The radius of the inner diameter of the glass tube = r

Volume of cylinder = $\pi r^2h$

$7.7573 cm^3=3.14\times r^2\times 12.7 cm$

r = 0.4410 cm.

7 0

3 years ago

A particular reactant decomposes with a half‑life of 109 s when its initial concentration is 0.280 M. The same reactant decompos

Sophie [7]

Answer:

The order of reaction is 2.

Rate constant is 0.0328 (M s)⁻¹

Explanation:

The rate of a reaction is inversely proportional to the time taken for the reaction.

As we are decreasing the concentration of the reactant the half life is increasing.

a) For zero order reaction: the half life is directly proportional to initial concentration of reactant

b) for first order reaction: the half life is independent of the initial concentration.

c) higher order reaction: The relation between half life and rate of reaction is:

Rate = $\frac{1}{k[A_{0}]^{(n-1)}}$

Half life = $K\frac{1}{[A_{0}]^{(n-1)} }$

$\frac{(halflife_{1})}{(halflife_{2})}=\frac{[A_{2}]^{(n-1)}}{[A_{1}]^{(n-1)} }$

where n = order of reaction

Putting values

$\frac{109}{231}=\frac{[0.132]^{(n-1)}}{[0.280]^{(n-1)}}$

$0.472=(0.472)^{(n-1)}$

Hence n = 2

$halflife=\frac{1}{k[A_{0}]}$

Putting values

$231=\frac{1}{K(0.132)}$

K = 0.0328

4 0

3 years ago

Question 3: Which state of matter does not freely flow?

vfiekz [6]

Answer:

Solid

Liquids and gas can freely go where they want to

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3 years ago

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The empirical formula of an artificial sweetener is C14H18N2O5. The molecular mass of the sweetener is 294.34 g/mol. What is the

Darina [25.2K]

C14H18N2O5
In limiting reactions and chemical reactions.

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3 years ago

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SOMEONE PLEASE HELP ME ASAP PLEASE!!!!

trasher [3.6K]

Answer: 350torr

Explanation: it will reach such i high pressure level that it will reach contobey level

6 0

4 years ago