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3 years ago

Why metals are good conductor of electricity

Chemistry

2 answers:

lora16 [44]3 years ago

5 0

Answer:

Metals are an excellent conductor of electricity and heat because the atoms in the metals form a matrix through which outer electrons can move freely. Instead of orbiting their respective atoms, they form a sea of electrons that surround the positive nuclei of the interacting metal ions

HACTEHA [7]3 years ago

3 0

Explanation:

silver is the best conductor

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When 4.21 grams of potassium hydroxide are added to 250 mL of water in a coffee cup calorimeter, the temperature rises by 4.14°C

Schach [20]

Answer:

The molar heat of solution of potassium hydroxide = 57.7 kJ /mol

Explanation:

Step 1: Data given

Mass of potassium hydroxide = 4.21 grams

Volume of water = 250 mL

Temperature rise = 4.14 °C

Density = 1g/mL

Specific heat = 4.184 J/g°C

Step 2: Calculate the heat absorbed by water

q = m*c*ΔT

⇒ with m = the mass of water = 250 grams

⇒ with c= the specific heat of the solution = 4.184 J/g°C

⇒ with ΔT = 4.14 °C

q = 250 * 4.184*4.14 = 4330.4 J

Step 3: Calculate moles of KOH

Moles KOH = Mass KOH / Molar mass KOH

Moles KOH = 4.21 grams / 56.106 g/mol

Moles KOH = 0.075 moles

Step 4: Calculate molar heat of solution

4330.4 J / 0.075 moles = 57738.7 j/mol = 57.7 kJ /mol

(Note that the enthalpy change for the reaction is negative because the reaction is exothermic)

The molar heat of solution of potassium hydroxide = 57.7 kJ /mol

6 0

4 years ago

What kind of adaptation are the ears on a rabbit

Jet001 [13]

Answer:

Structural

Explanation:

Structural adaptions are the physical features of an organism that enable them to survive in their environment.

The rabbit’s long ears are an essential survival tool. They help the rabbit listen to the faint sounds made by nearby predators and their shape helps to detect sound direction accurately.

Also, if the rabbit lives in a hot desert, the large ears radiate heat, allowing it to control its temperature.

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3 years ago

Large quantities of tritium were released into the atmosphere in the 1950s and 1960s during atmospheric nuclear testing. This tr

Sergeu [11.5K]

The ocean
hope I helped

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3 years ago

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An aerosol is a colloidal _____ suspended in a _____. A.liquid B.solid C.gas

Anna007 [38]

Answer:

An aerosol is a colloidal A. liquid suspended in a C. gas.

Explanation:

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3 years ago

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Fill in the blanks with appropriate options given in below:

jarptica [38.1K]

Answer:

1) -COOH

2) -NH2

3) hydrogen bonds

4) dispersion forces

5) -CH3

6) hydrogen bonds

7) negative

8) negative

9) positive

Explanation:

Alanine has a -COOH and a -NH2 group available to form hydrogen bonds with water molecules.

Although there are some potential dispersion forces between the terminal -CH3 group of alanine and hexane molecules, we expect the hydrogen bonds between alanine and water to be stronger.

Stronger intermolecular attractive forces between alanine and water lead to a more negative ΔHmix and more negative (smaller positive) ΔHsoln for water than for hexane.

4 0

3 years ago

Why metals are good conductor of electricity​

Why metals are good conductor of electricity