Which element is a metalloid? Check all that apply. selenium (Se) polonium (Po) silicon (Si) iodine (I) tin (Sn) antimony (Sb) p
hosphorus (P)
2 answers:
The metalloids are highlighted in the table.
Of the elements in the question, the following are metalloids...
<span>antimony (Sb)
</span><span>silicon (Si)
</span><span>polonium (Po)
</span>
Of the elements in the question, the following are metalloids...
<span>antimony (Sb)
</span><span>silicon (Si)
</span><span>polonium (Po)
</span>
Answer: Polonium (Po), Silicon (Si), Antimony(Sb)
Explanation: Metalloids are the elements which exhibits some properties of both metals and non-metals. They are generally called as semi-metal. There are in total 7 metalloids in whole periodic table. They are:
Boron (B), Silicon (Si), Germanium (Ge), Arsenic (As), Antimony (Sb), Telurium (Te) and Polonium (Po).
From, the list and periodic table attached, it is visible that only Silicon, Polonium and antimony are the metalloids from the elements given.
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<u>Answer:</u> The mass or zinc reacted is 0.624 grams.
<u>Explanation:</u>
We are given:
Total pressure = 1.032 atm
Vapor pressure of water = 32 torr = 0.042 atm (Conversion factor: 1 atm = 760 torr)
To calculate partial pressure of hydrogen gas, we use the equation:
To calculate the number of moles of hydrogen gas, we use the equation given by ideal gas follows:
where,
P = pressure of hydrogen gas = 0.99 atm
V = Volume of hydrogen gas = 240. mL = 0.240 L (Conversion factor: 1 L = 1000 mL)
T = Temperature of hydrogen gas =
R = Gas constant =
n = number of moles of hydrogen gas = ?
Putting values in above equation, we get:
The chemical equation for the reaction of zinc and hydrochloric acid follows:
By Stoichiometry of the reaction:
1 mole of hydrogen gas is produced from 1 mole of zinc metal
So, of hydrogen gas is produced from =
of zinc metal
To calculate the mass of zinc metal, we use the equation:
Molar mass of zinc = 65.38 g/mol
Moles of zinc = moles
Putting values in above equation, we get:
Hence, the mass or zinc reacted is 0.624 grams.