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vampirchik [111]
3 years ago
6

1. A group of elements that includes the most active of the nonmetals is the

Chemistry
1 answer:
Sunny_sXe [5.5K]3 years ago
4 0

Answer:

D. Halogens

Explanation:

All elements in these groups have 7 valence electrons, meaning their electronegativity is the highest among the elements.

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Ground based reflecting telescopes use what part of the
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Ground based reflecting telescopes uses the radio wave part of the electromagnetic spectrum to view objects.

<h3>What is a Telescope?</h3>

This is an optical instrument which makes things or objects which are far to look nearer.

Ground based reflecting telescopes are used in outer space and blocks gamma , light waves etc but uses the radio waves.

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2 years ago
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What type of energy must you add to a substance to make the particles of the substance
algol13

Answer: thermal  energy a}

Explanation:

Thermal energy (also called heat energy) is produced when a rise in temperature causes atoms and molecules to move faster and collide with each other. The energy that comes from the temperature of the heated substance is called thermal energy.

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In a famous experiment , positively charge particles were aimed at a thin sheet of gold foil. The result of this experiment were
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The result of Rutherford's gold foil experiment was that most of the particles went straight through the foil without being deflected.

However, a few of the particles were deflected by relatively large angles.

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3 years ago
Which statement is correct about the reaction that occurs between copper and aqueous silver nitrate?
svetlana [45]

Answer:

It is a single replacement reaction because copper replaces silver within a compound as copper is higher than silver in the activity series.

Explanation:

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A sample of an unknown gas takes 222 s to diffuse through a porous plug at a given temperature. At the same temperature, N2(g) t
gulaghasi [49]

Answer:

\large \boxed{\text{45.1 g/mol}}

Explanation:

Graham’s Law applies to the diffusion of gases:

The rate of diffusion (r) of a gas is inversely proportional to the square root of its molar mass (M).

r \propto \dfrac{1}{\sqrt{M}}

If you have two gases, the ratio of their rates of diffusion is

\dfrac{r_{2}}{r_{1}} = \sqrt{\dfrac{M_{1}}{M_{2}}}

The time for diffusion is inversely proportional to the rate.

\dfrac{t_{2}}{t_{1}} = \sqrt{\dfrac{M_{2}}{M_{1}}}

Data:

t₂ = 222 s

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M₁ = 28.01

Calculation :

\begin{array}{rcl}\dfrac{222}{175} & = & \sqrt{\dfrac{M_{2}}{28.01}}\\\\1.269 & = & \sqrt{\dfrac{M_{2}}{28.01}}\\\\1.609 & = & \dfrac{M_{2}}{28.01}\\\\M_{2} & = & 1.609 \times 28.01\\ & = & \textbf{45.1 g/mol}\\\end{array}\\\text{The molar mass of the unknown gas is $\large \boxed{\textbf{45.1 g/mol}}$}

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3 years ago
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