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kati45 [8]
3 years ago
13

Is hardness physical or chemical property

Chemistry
1 answer:
Afina-wow [57]3 years ago
6 0

Answer:

The properties of the Hardness are:

Hardness is a physical property

Hardness is indicative of the strength of chemical bonds between elements.

Diamond can scratch quartz Explanation:

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Dimas [21]
Where are options? without that, i can’t help you sorry
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3 years ago
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For the reaction given below, the frequency factor A is 8.7 1012 s−1 and the activation energy is 63 kJ/mol. NO(g) + O3(g) → NO2
Alex73 [517]

Answer:

K(70°C) = 2213.376 s-1

Explanation:

balanced reaction:

  • NO(g) + O3(g) → NO2(g) + O2(g)

∴ Ea = 63 KJ/mol

∴ A = 8.7 E12 s-1

∴ T = 70°C ≅ 343 K

Arrhenius eq:

  • K(T) = Ae∧(- Ea/RT)

∴ R = 8.314 E-3 KJ/K.mol

⇒ K(70°C) = (8.7 E12 s-1)e∧[-(63)/(8.314 E-3)(343)]

⇒ K(70°C) = (8.7 E12 s-1)*(2.5444 E-10)

⇒ K(70°C) = 2213.376 s-1

6 0
3 years ago
If we supply additional heat to a solid in equilibrium with its liquid at the melting point, the thermal energy added is used to
trapecia [35]

Answer:

c. change solid to liquid.

Explanation: Heat is an energy which is present in a substance which is obtained through the transfer of temperature from a substance or material of high temperature to a substance or material of lower temperature. Heat is measured in JOULES OR KILOJOULES,

When heat is applied to a solid material it tends to cause the atomic particles of the solid to have a high kinetic energy making them to loose attachment to each other,when this particles starts to get detached their is the chance of a CHANGE OF STATE WHICH CAN BE FROM SOLID TO LIQUID OR FROM LIQUID TO GAS.

6 0
3 years ago
A balloon at 30.0°C has a volume of 222 mL. If the temperature is increased to 56.1°C and the pressure remains constant, what wi
svp [43]

Answer:

<em>415.15 mL</em>

Explanation:

To solve the statement, you can use the law of Charles - Gay Lussac, which states that "<em><u>the volume of gas is directly proportional to its temperature at constant pressure</u></em>." Mathematically:

\frac{V1}{T1} = \frac{V2}{T2} = Constant

You can calculate the volume V₂ Clearing it from the equation and replacing the values granted by the statement to perform the calculation:

V₂ = V₁ x T₂ / T₁ = 222 mL x 56.1 ° C / 30.0 ° C = 415.15 mL

Therefore, <em>the gas at 56.1 ° C will occupy a volume of 415.15 mL</em>

7 0
3 years ago
The closer to 7 a substance measures on the pH scale, the ______ the compound fill in the blank
Goryan [66]

Explanation:

  • If the PH is greater than 7 then the solution is basic

  • If the PH is less than 7 then the solution is acidic

  • If the PH is equal to 7 then the solution is neutral

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