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3 years ago

Which of the following elements would exhibit the greatest shielding effect?

2 answers:

5 0

Rubidium because it is lower on the periodic table and therefore has more electrons to shield the valence electrons from the positive core

Korolek [52]3 years ago

5 0

Answer: Option (D) is the correct answer.

Explanation:

Shielding effect is the effect in which nucleus of an atom is surrounded by number of electrons in such a manner that there will be decrease in attraction between nucleus and valence electrons.

So, more is the number of shells present in an atom more will be its shielding effect. Whereas smaller is the size of atom more will be attraction between its nucleus and valence electrons. So, it would be difficult to remove an electron from the valence shell.

For example, rubidium is larger in size so it has more number of shells and thus more shielding effect.

Thus, we can conclude that out of the given options rubidium would exhibit the greatest shielding effect.

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Suppose you have a sample of table salt (NaCl) that has a mass of 100.0 grams. If

IgorC [24]

Taking into account the definition of molarity, the concentration of the solution is 0.855 $\frac{moles}{liter}$ .

<h3>Definition of molarity</h3>

Molar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.

The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:

$Molarity=\frac{number of moles}{volume}$

Molarity is expressed in units $\frac{moles}{liter}$ .

<h3>Molarity of NaCl</h3>

In this case, you have:

number of moles of NaCl= $100 grams\frac{1 mole}{58.45 grams} =$ 1.71 moles (being 58.45 g/mole the molar mass of NaCl)
volume 2 L

Replacing in the definition of molarity:

$Molarity=\frac{1.71 moles}{2 L}$

Solving:

Molarity= 0.855 $\frac{moles}{liter}$

Finally, the concentration of the solution is 0.855 $\frac{moles}{liter}$ .

Learn more about molarity:

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5 0

2 years ago

Where do reactions in a solid generally take place?

Sholpan [36]

Answer:

It's D. On the surface of the solid.

Explanation:

If the reactant is a solid, the surface area of the solid will impact how fast the reaction goes. This is because the two types of molecule can only bump into each other at the liquid solid interface, i.e. on the surface of the solid. So the larger the surface area of the solid, the faster the reaction will be.

3 0

3 years ago

Which of the following systems has the highest entropy?. . . A cup of ice at 0 degrees C. . A cup of water at 50 degrees C. . A

Sholpan [36]

Entropy is a measure of chaos or disorder in a system. For the first one, the system with the highest entropy is a cup of water at 0 degress centigrade. For the second question, the system with the lowest entropy is sugar crystals in 95 degrees centigrade cup of coffee.

4 0

4 years ago

Read 2 more answers

What are the five steps of the scientific method in order from first to last? A:observation, problem, hypothesis, project experi

lara [203]

Answer:

he scientific method has five basic steps, plus one feedback step:

Make an observation.

Ask a question.

Form a hypothesis, or testable explanation.

Make a prediction based on the hypothesis.

Test the prediction.

Iterate: use the results to make new hypotheses or predictions.

Explanation:

I think A.

7 0

3 years ago

Read 2 more answers

Metal oxides are in which state?

Elena L [17]

Answer:

Metal oxides are crystalline solids that contain a metal cation and an oxide anion. They typically react with water to form bases or with acids to form salts.

Explanation:

Hope this helps!

8 0

3 years ago