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ANEK [815]
2 years ago
11

Why is copper a pure substance? a. because it is an element b. because it is a compund c. because it is a homogenous mixture

Chemistry
1 answer:
Step2247 [10]2 years ago
6 0

Answer:

a. because it is an element

Explanation:

its pure because it only has one type of atom, making it an element

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The smallest particle of an element is a(n) .<br>atom<br>molecule<br>DNA​
mamaluj [8]

Answer:

An atom is the smallest particle of an element

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3 years ago
What is the energy of an electromagnetic wave with a frequency of 8 x 10^12
omeli [17]

Answer:

Energy, E=5.3\times 10^{-21}\ J

Explanation:

It is required to find the energy of an electromagnetic wave with a frequency of 8\times 10^{12}\ Hz. The energy of a wave in terms of its frequency is given by :

E=h\nu

\nu = frequency of em wave

E=6.63\times 10^{-34}\times 8\times 10^{12}\\\\E=5.3\times 10^{-21}\ J

So, the energy of an electromagnetic wave is 5.3\times 10^{-21}\ J

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3 years ago
What caused the bonding of two atoms which undergo an ionic bond?
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<span>Since one is negative and one is positive they are held together by their electrostatic attraction to each other, much like how a north and south pole of a magnet attract.</span>
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What is the name of the base represented by the formula NH4OH
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It's Ammonium hydroxide
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3 years ago
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The temperature of 6.24 L of a gas is increased from 25.0°C to 55.0°C at constant pressure. The new volume of the gas is Questio
Sphinxa [80]

Answer:

Heating this gas to 55 °C will raise its volume to 6.87 liters.

Assumption: this gas is ideal.

Explanation:

By Charles's Law, under constant pressure the volume V of an ideal gas is proportional to its absolute temperature T (the one in degrees Kelvins.)

Alternatively, consider the ideal gas law:

\displaystyle V = \frac{n \cdot R}{P}\cdot T.

  • n is the number of moles of particles in this gas. n should be constant as long as the container does not leak.
  • R is the ideal gas constant.
  • P is the pressure on the gas. The question states that the pressure on this gas is constant.

Therefore the volume of the gas is proportional to its absolute temperature.

Either way,

V\propto T.

\displaystyle V_2 = V_1\cdot \frac{T_2}{T_1}.

For the gas in this question:

  • Initial volume: V_1 = \rm 6.24\; L.

Convert the two temperatures to degrees Kelvins:

  • Initial temperature: T_1 = \rm 25.0\;\textdegree{C} = (25.0 + {\rm 273.15})\; K = 298.15\;K.
  • Final temperature: T_1 = \rm 55.0\;\textdegree{C} = (55.0 + {\rm 273.15})\; K = 328.15\;K.

Apply Charles's Law:

\displaystyle V_2 = V_1\cdot \frac{T_2}{T_1} = \rm 6.24\;L \times \frac{328.15\; K}{298.15\;K} = 6.87\;L.

7 0
3 years ago
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