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3 years ago

A student thinks that the more protons an atom has, the more reactive it will be. Which will best disprove this student's idea?

Chemistry

2 answers:

Tema [17]3 years ago

6 0

Answer:

Compare the reactivities of lithium (Li) and Krypton (Kr)

Explanation:

Lithium has an atomic number of 3 while krypton has an atomic number of 36. Note that atomic number is the number of protons present in an atom. It can be deduced from the above that krypton has more protons than lithium however krypton is found in the group zero of the periodic table and thus a noble gas. One of the properties of noble gases/group zero elements is that they have low reactivity because of there octet configuration/completely filled outermost shell.

However, lithium on the other hand is a member of group 1 (called alkali metals) in the periodic table. Group 1 elements are highly reactive (there members are some of the most reactive metals) because they have just one electron in there outermost shell which can be easily donated to achieve duplet/octet configuration.

Hence, Lithium (Li) with 3 protons is more reactive than krypton (Kr) with 36 protons hence disputing the student's idea.

d1i1m1o1n [39]3 years ago

3 0

I'd have to say that the best choice of the ones listed above would be the first one.

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Identify the reactants and products in the following chemical equation: Zn +2HCl --> ZnCl2 + H2 *

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Answer:

Explanation:

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2 years ago

How many liters of carbon dioxide will be produced at STP if 3.56 g calcium carbonate reacts completely with carbon dioxide? CaC

sp2606 [1]

Answer:

V = 0.798 L

Explanation:

Hello there!

In this case, for this gas stoichiometry problem, we first need to compute the moles of carbon dioxide via stoichiometry and the molar mass of starting calcium carbonate:

$3.56gCaCO_3*\frac{1molCaCO_3}{100gCaCO_3} *\frac{1molCO_2}{1molCaCO_3} =0.0356molCO_2$

Next, we use the ideal gas equation for computing the volume, by bearing to mind that the STP conditions stand for a pressure of 1 atm and a temperature of 273.15 K:

$PV=nRT\\\\V=\frac{nRT}{P}\\\\V=\frac{0.0356mol*0.08206\frac{atm*L}{mol*K}*273.15K}{1atm} \\\\V=0.798L$

Best regards!

4 0

3 years ago

Calcium chloride reacts with sodium hydroxide to form solid calcium hydroxide, Ca(OH)2. The balanced net ionic equation is

katen-ka-za [31]

Answer:

Ca²⁺ + 2 OH⁻ → Ca(OH)₂(s)

Explanation:

In chemistry, the net ionic equation is a way to write a chemical reaction whereas you write only the ions that are involved in the reaction.

When calcium chloride, CaCl₂ reacts with sodium hydroxide, NaOH to produce Ca(OH)₂ the only ions involved in the reaction are Ca²⁺ and OH⁻, thus, the balanced net ionic equation is:

Ca²⁺ + 2 OH⁻ → Ca(OH)₂(s)

Cl⁻ and Na⁺ are not involved in the reaction and you don't have to write them.

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3 years ago

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3 years ago

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Marina CMI [18]

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3 years ago