A tire at 21°C has a pressure of 0.82 atm. Its temperature decreases to –3.5°C. If there is no volume change in the tire, what is the pressure after the temperature change?

Answers

Answer 1

Answer: Using ideal gas equation, PV = nRT, and since there is no volume change and amount change, the equation is now P = kT, where k =nR/V. Temperature must be in kelvin From the given, k = (0.82)/ (21 + 273) = 2.78 x 10^-3 Substituting T = -3.5+273, P = 0.75 atm

Answer 2

Answer:

it would be 0.75 atm

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Copper, silver, and nickel are all classified as

Answers

Answer: currency

Explanation:

43 A sample of helium gas is in a sealed, rigid container. What occurs as the temperature of the sample is increased?(1) The mass of the sample decreases.(2) The number of moles of gas increases.
(3) The volume of each atom decreases.
(4) The frequency of collisions between atoms increases.

Answers

Answer is: (4) The frequency of collisions between atoms increases.

The average kinetic energy of molecules depends on the temperature.

As temperature increases, molecules gain more energy from surrounding and move faster and have more collisions.

Kinetic energy (standard unit is the joule J) depends on speed of the molecule.

Charles' Law (The Temperature-Volume Law) - the volume of a given amount of gas held at constant pressure is directly proportional to the Kelvin temperature:

V₁/T₁ = V₂/T₂.

When temperature goes up, the volume also goes up.

The best answer is (4) The frequency of collisions between atoms increases, for we are providing the atoms with energy.
Hope this helps~

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Answers

The correct answer is the first option. Each level of energy transfer in an ecosystem or food chain is called a trophic level. It comprises organisms that share the same function in the food chain in relation to the primary sources of energy.

The correct option is the first one

On a temperature versus time graph, how does the temperature at the beginning of a change of state compare with the temperature at the end of the change?

Answers

the answer is ALWAYS THE SAME.

Answer:B

Explanation:

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Answers

Kelvin is a unit for temperature. The temperature of the car motor oil must have been measured and described. At 0 degree Celsius or freezing point of water, there is 273 Kelvin. At the boiling point of water, it reads 373 Kelvin. This is the standard used by scientists in solving in equations. However, Celsius and Fahrenheit are common to daily basis.

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Answers

Answer:

This reaction is completed by a double displacement

A double displacement occurs when two different salts are mixed in an aqueous state, since when they dissolve a salt their ions are dissociated and when mixed with another salt in an aqueous state they combine and form two new compounds

Double displacement reactions

$AB + CD\longrightarrow AC+ BD$

$Ba(NO_3)_2+Na_2SO_4 \longrightarrow 2NaNO_3 +BaSO_4$

Ba(NO₃)₂ + Na₂SO₄ → 2NaNO₃ + BaSO₄

The reaction goes to completion because it has the same amount of elements in the reactants and products.

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