<span>These are two questions and two answers.
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<span>Question 1) The elements most likely to form more than one type of ion are the ______.
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<span>Answer: option A) transition metals.
</span><span>Jusitification:</span>
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1) The elements form ions by gaining or losing electrons. By gaining electrons, theY form anions (negative iones); by losing electrons, they form cations (positive ions).
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<span>2) The valence shell of the akaly metals is the type ns¹, which means that they have one electron in the valence shell. Then, they only can form one kind of ion which has the configuration of the previous noble gas (n-1)s²(n-1)p⁶ with 1+ charge.
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<span>3) The halogens have valence shell of the type ns²np⁵. That means that easily gain 1 electron to complete the valence shell ns²np₆ (the configuration of the next noble gas), with charge 1-. Gaining 5 electrons or losing more electrons than 1 is very disfavourable, so that is the only kind of ion they form.
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<span>4) The valence shells of alkaline earth metals are of the kind ns². So, the most favourable energetic ion is formed by losing 2 electrons and so taking the configuration of the previous noble gas, with charge 2+. That is the only type of ion they form.
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<span>5) Transition metals have electrons in the orbitals d, which are very similar in energy, and so they might loose 1, 2, or 3, electrons fo form ions with charges 1+, 2+, or 3+ respectively.
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<span>Question 2) The name iron(II) indicates that a compound contains _______.</span>
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A) iron ions with an II+ charge.
</span><span>B) iron ions with a 2+ charge.
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C) iron ions with a negative charge.
<span>D) two types of iron ions.
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Answer: option <span>B) iron ions with a 2+ charge.
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</span><span>The oxidation state may be indicated as Roman numerals, in this case II, or as a conventional number with its charge.
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</span><span>Iron, a transition metal, may loose 2 or 3 valence electrons. When it loses 2 electrons it forms an ion (cation) with positive charge 2. So, it is iron 2+</span>
Answer:
205 calories.
Explanation:
According to the USDA, "Carbohydrates provide 4 calories per gram, protein provides 4 calories per gram, and fat provides 9 calories per gram." 9 grams of fat at 9 calories per equals 81 calories + 6 grams of protein at 4 calories per gram which equals 24 calories + 25 grams of carbohydrate at 4 calories per gram which is equal to 100 calories.
Total that all up and you get 81 cal + 24 cal + 100 cal=205 calories.
I don't know what kind of course this is for, but if they are incredibly picky, what we refer to as "calories" are actually kilocalories, which are equal to one thousand "real" calories each. However, I'm very confident that the correct answer is 205 calories.
Answer:
Explanation:
1. Calculate the moles of NaOH.
2. Calculate the volume of NaOH
Answer:
i would see you tomorrow we have lunch together
Explanation: