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torisob [31]
4 years ago
6

The electron dot diagram shows the arrangement of dots without identifying the element. ? with 2 dots each above and right and 1

dot each below and left. Which element’s symbol could replace the question mark in the diagram? carbon (C) tellurium (Te) beryllium (Be) cesium (Cs)
Chemistry
2 answers:
Talja [164]4 years ago
5 0

Answer:

The electron dot diagram shows the arrangement of dots without identifying the element.

? with 2 dots each above and right and 1 dot each below and left.

Which element’s symbol could replace the question mark in the diagram?

carbon (C)

tellurium (Te)

beryllium (Be)

cesium (Cs)

Explanation:

Nimfa-mama [501]4 years ago
4 0

Answer:

B.) tellurium (Te)

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the lowest point of energy the the graph reaches

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A ball is dropped from a height of 1.20 m and hits the floor. The ball compresses and then reforms to spring upwards from the fl
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Answer:

\large \boxed{\text{98 m$\cdot$s}^{-2}}

Explanation:

The formula for the velocity of the ball is

v = \sqrt{2gh}

1. Velocity at time of impact

v = -\sqrt{2 \times 9.807 \times 1.20} = -\sqrt{23.54} = -\textbf{4.85 m/s}

2. Velocity on rebound

The ball has enough upward velocity to reach a height of 0.86 m.

v = \sqrt{2 \times 9.807 \times 0.86} = \sqrt{16.87} =\textbf{4.11 m/s}

3. Acceleration

a = \dfrac{\Delta v}{\Delta t} = \dfrac{4.11 - (-4.85)}{ 0.091} = \dfrac{8.96 }{0.091} =\textbf{98 m$\cdot$s}^{\mathbf{-2}}\\\\\text{The acceleration while the ball is in contact with the floor is $\large \boxed{\textbf{98 m$\cdot$s}^{\mathbf{-2}}}$}

5 0
4 years ago
Humans have used rocks in the creation of tools and building materials true or flase
Anuta_ua [19.1K]
True, if you would like an example look at Indian arrow heads or early architecture all use rocks.
4 0
3 years ago
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What is the percent yield of O2 if 10.2 g of O2 is produced from the decomposition of 17.0 g of H2O?
yawa3891 [41]

The balanced chemical reaction will be:

2H2O = 2H2 + O2

<span>We are given the amount of water used in the decomposition reaction. This will be our starting point.</span>

<span>17.0 g H2O</span> (1 mol  H2O/ 18.02 g H2O) (1 mol O2/2 mol <span>H2O</span>) ( 32.00 g O2/1mol O2) = 15.09 g O2

Percent yield = actual yield / theoretical yield x 100

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3 years ago
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For the reaction below, complete the rate expression that relates the change in concentration with respect to time to the rate o
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Answer: Rate in terms of disappearance of NO = -\frac{1d[NO]}{2dt}

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Explanation:

Rate law says that rate of a reaction is directly proportional to the concentration of the reactants each raised to a stoichiometric coefficient determined experimentally called as order.

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Rate in terms of appearance of NOCl = +\frac{1d[NOCl]}{2dt}

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