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Mekhanik [1.2K]

3 years ago

12

What are the chemical properties of elements related to?

1 answer:

MAVERICK [17]3 years ago

3 0

<span>The chemical properties of ANY atom are found in how they react with other elements.

A. An element's symbol - Nothing to do with reactions

B. The average atomic mass -The mass doesn't react

C. The number of electrons that occupy the outer shell - the only part of the electrons that move, SO they are involved in the reactions (answer)

D. The total number of electrons - The inner electrons cannot move from the atom unless there is ALOT of energy given to them, so these cannot react and would not contribute to the chemical properties.</span>

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Explanation:

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3 years ago

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Which is the best description of a molecule?

Mazyrski [523]

Answer:

A molecule of an element is composed of exactly two types of atoms.

Explanation:

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What will be the ME of a machine that produces a 240 N work with a 300

Elden [556K]

Answer:

Efficiency = 80%

Explanation:

Given the following data;

Work output = 240 N

Work Input = 300 N

To find the mechanical efficiency of a machine;

$Efficiency = \frac {Out-put \; work}{In-put \; work} * 100$

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Therefore, the mechanical efficiency of the machine is 80 percent.

3 0

3 years ago

Find the frequency (in hertz) of the first overtone for a 1.75 m pipe that is closed at only one end. Use 350 m/s for the speed

serg [7]

Answer:

The first overtone frequency is 100 Hz.

Solution:

According to the question:

Length of pipe, l = 1.75 m

Speed of sound in air, v_{sa} = 350 m/s

Frequency of first overtone, $f_{1}$ is given by:

$f_{1} = \frac{v_{sa}}{2l}$

$f_{1} = \frac{350}{2\times 1.75} = 100 Hz$

Since, the frequency, as clear from the formula depends only on the speed

and the length. It is independent of the air temperature.

Thus there will be no effect of air temperature on the frequency.

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3 years ago

Why would a baseball traveling at 20 m/s have more kinetic energy than a baseball traveling at 5 m/s?

bagirrra123 [75]

Answer:

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3 years ago