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A 1.00 carat pure diamond has a mass of 0.2 grams. How many carbon atoms are there within this diamond?
In this example you have 0.2 grams of carbon atoms. The first step is to find out how many moles this is. The molar mass of carbon is 12.01 g/mol,...
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The density of pure diamond is 3.5 g/cm^3. What is the volume of a diamond with a mass of 0.25g?
$rho,"density"="Mass"/"Volume"$ And thus $"Volume"="Mass"/rho=(0.25*g)/(3.5*g*cm^-3)=0.0714*cm^3$
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A chemical compound requires 8 ounces of Chemical A and 12 ounces of Chemical B. A mixture contains 24 ounces of Chemical A and 30 ounces of Chemical B. How can you fix the mixture to make the chemical compound?
Since 8x3=24 and since 12x3=36 you need to add 6oz of chemical B to have 24oz of chemical A and 36oz of chemical B. Take 1/3 of the total mixture...
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Consider the following element combinations. Classify the bonds formed between each pair as ionic, polar covalent, or nonpolar covalent qualitatively based solely on each element's position on the periodic table? Do not conduct calculations.
Something worth knowing about deciding between nonpolar and polar is that only two of the same element can form an ideally nonpolar bond. With this in mind, the $"Br"-"Br"$...
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Classify each solid as a covalent, ionic, metallic, or molecular solid? Diamond, frozen carbon dioxide, pure sodium, and sodium sulfide
$CO_2(s)$ is molecular, with the individual molecules held together by (weak) dispersion forces. Sodium exhibits ; i.e. positive ions in an electron sea, which gives rise to demonstrable malleability and...
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Classify each solid as a covalent, ionic, metallic, or molecular solid?
diamond, pure sodium, sodium sulfide, frozen carbon dioxide
$"Sodium"$ exhibits ........ $"Sodium sulfide"$ is an ionic solid, i.e. $Na_2S$ And $"solid carbon dioxide"$, i.e. $"dry ice"$, is a molecular solid.
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The electronegativity is 2.1 for H and 1.8 for Si. Based on these electronegativities, $SiH_4$ would be expected ?A) be ionic and contain H+ ions (B) be ionic and contain H- ions (C) have polar covalent bonds with a partial negative charges on the H atoms
The answer is (C) have polar covalent bonds with a partial negative charge on the hydrogen atoms. If you only go by the options given, the answer will be obvious...
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How are these ordered from strongest to weakest: hydrogen bonds,covalent bonds, ionic bonds, and van der waals interactions?
This is the conventional order. Ionic bonds are of course non-molecular interactions.
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The weight of a diamond is given in carats. One carat is equivalent to 200 mg. A pure diamond is made up entirely of carbon atoms. How many carbon atoms make up a 1.00 carat diamond?
Convert 200 mg to g. $"1000 mg=1 g"$ $200cancel"mg"xx(1"g")/(1000cancel"mg")="0.2 g"$ Convert carats to grams to moles. $"1.00 ct=0.2 g"$ $1"mol C=12.0107 g C"$ $1.00cancel"ct C"xx(0.2cancel"g C")/(1cancel"ct C")xx(1"mol C")/(12.0107cancel"g C")="0.02 mol...
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Are network covalent bonds STRONGER than ionic bonds?
Both network covalent solids, and ionic solids ARE non-molecular, and are therefore expected to have elevated melting points with respect to molecular species. Let's compare the melting points of $NaCl$...
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