Which changes occur as a cadmium atom, Cd, becomes a cadmium ion, Cd2+?

1 answer:

3 0

The answer is (3). To form the cation (positive ion), Cd must lose negative charge, so two electrons are lost. This loss in electrons also increases the effective nuclear charge/ reduces electron shielding. In other words, with two less electrons to hold, the nucleus exerts a stronger attractive force on the remaining electrons, so the electron cloud is pulled closer to the nucleus. The radius therefore decreases.

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Which statement about the greenhouse effect is NOT true?

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<span> Greenhouse gases were not historically present in the atmosphere.</span>

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Describe what happens when two negatively charged particles interact with one another. (plz help 40 points!)

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When two negatively charged particles interact with one another, the particles repel with each other. Opposite charges attract while like charges repel. A negatively charged object will exert a repulsive force upon a second negatively charged object.

Explanation:

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13. The type of chemical bond that forms between oppositely charged ions is aln) a. covalent bond.

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IONIC BOND

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When 16.35 moles of SI reacts with 11.26 moles of N2, how many moles of SI3N4 are formed

Allushta [10]

Answer:

5.450 mol Si₃N₄

Explanation:

Step 1: Write the balanced equation

3 Si + 2 N₂ ⇒ Si₃N₄

Step 2: Establish the theoretical molar ratio between the reactants

The theoretical molar ratio of Si to N₂ is 3:2 = 1.5:1.

Step 3: Establish the experimental molar ratio between the reactants

The experimental molar ratio of Si to N₂ is 16.35:11.26 = 1.45:1. Comparing both molar ratios, we can see that Si is the limiting reactant.

Step 4: Calculate the moles of Si₃N₄ produced from 16.35 moles of Si

The molar ratio of Si to Si₃N₄ is 3:1.

16.35 mol Si × 1 mol Si₃N₄/3 mol Si = 5.450 mol Si₃N₄

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