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2 years ago

142 amu of chlorine would contain

Chemistry

1 answer:

zhuklara [117]2 years ago

5 0

Answer: There are four atoms

Explanation: mass of Cl atom is 35.45 amu

Amount of atoms n = m/M = 142 / 35.45 = 4

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Categorize them by Metal, Nonmetal, Metalloid

laila [671]

Answer:

METAL: found in periodic table, lithium, shiny, lose electrons easily, good conductor, elements

NONMETAL: brittle, ductile, semimetals, found in periodic table, often gain electrons, semiconductors, carbon, shiny, poor conductor, elements

METALLOID: solid, non- ductile, malleable, found in periodic table, silicon, shiny, can be liquids, elements

6 0

2 years ago

Which of the following atoms are isotopes? 22Na 22Ne 22Na 22Mg 24Na

Dima020 [189]

Na22 and Na24 are isotopes

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3 years ago

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kozerog [31]

Answer:

Average of measurements = 20.97 cm

Explanation:

Given data:

Three measurements of pete's = 20.9 cm, 21.0 cm, 21.0 cm.

Average value of measurements = ?

Formula:

Average of measurements = sum of all measurements / Total number of measurements

Solution:

Average of measurements = 20.9 cm + 21.0 cm + 21.0 cm. / 3

Average of measurements = 62.9 cm / 3

Average of measurements = 20.97 cm

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2 years ago

According to the Kinetic Molecular Theory, as the volume of a gas increases: the number of particle impacts per unit area increa

aliya0001 [1]

As the volume of a gas increases at constant temperature, the number of particle impacts per unit area decreases.

There is the same number of impacts, but they are spread over a larger surface area.

Thus, the number of impacts per unit area decreases.

7 0

3 years ago

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What is the significance of "Er" in the diagram?

Drupady [299]

Answer:

The significance of "Er" in the diagram is :

B.) Threshold energy for reaction

Explanation:

Threshold energy : It is total amount of energy required by the reactant molecule to reach the transition state .

Activation energy : It is the excess energy absorbed by the molecules to reach the transition state.

Activation Energy = Threshold Energy - Average Kinetic Energy

This means Activation energy decreases on increasing kinetic energy

On increasing Temperature average kinetic energy of the molecule increases which reduces the activation energy and the reaction occur faster in that case.

Catalyst also reduces the Activation energy.

Er = Threshshold energy for reaction at 30 degree

Ea = Activation Energy

The given figure shows that the threshold energy decreases on increasing the temperature

Only the molecule having energy greater than Er can react to form product

3 0

2 years ago

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