You carefully weigh out 16.00 g of CaCO3 powder and add it to 64.80 g of HCl solution. You notice bubbles as a reaction takes pl
1 answer:
Answer: Mass of produced in this reaction was 6.56 grams
Explanation:
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.
Mass or reactants = Mass of + mass of
= 16.00 + 64.80 = 80.80 g
Mass of products = mass of aqueous solution + mass of + = 74.24 + x g
Mass or reactants = Mass of products
80.80 g = 74.24 + x g
x = 6.56 g
Thus mass of produced in this reaction was 6.56 grams
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The question is incomplete, here is the complete question:
Classify each element. Note that another term for main group is representative, another term for semi-metal is metalloid, and the inner transition metals are also called the lanthanide and actinide series.
Hf, Am, In, Ta, As, Se, Rn
<u>Answer:</u>
Hafnium and tantalum are transition elements.
Americium is a inner transition element.
Indium, Selenium and Radon are main group elements.
Arsenic is a metalloid.
<u>Explanation:</u>
Main group elements are the elements which belong to s block and p block. They are also known as representative elements.
S-block elements are defined as the elements whose last electron enters s-sub shell. The general electronic configuration of these elements is
P-block elements are defined as the elements whose last electron enters p-sub shell. The general electronic configuration of these elements is
Metalloids are defined as the elements which show intermediate properties between metals and non-metals. There are 7 metalloids in the periodic table. They are: Boron, Silicon, germanium, Arsenic, Antimony, Tellurium and Polonium.
Transition elements are known as d-block elements. D block elements are defined as the elements whose last electron enters d sub shell. The general electronic configuration of these elements is
Inner transition elements are known as (f block) elements. (F block) elements are defined as the elements whose last electron enters (f subshell). The general electronic configuration of these elements is . They are also known as lanthanide and actinide series.
For the given elements:
- <u>Option 1:</u> Hf
Hafnium is the 72nd element of the periodic table having electronic configuration of
As, the last electron is entering the d subshell, it is a transition element.
- <u>Option 2:</u> Am
Americium is the 95th element of the periodic table having electronic configuration of
As, the last electron is entering the (f subshell), it is a inner transition element.
- <u>Option 3:</u> In
Indium is the 49th element of the periodic table having electronic configuration of
As, the last electron is entering the p subshell, it is a main group element.
- <u>Option 4:</u> Ta
Tantalum is the 73rd element of the periodic table having electronic configuration of
As, the last electron is entering the d subshell, it is a transition element.
- <u>Option 5:</u> As
Arsenic is the 33rd element of the periodic table having electronic configuration of
As, the last electron is entering the p subshell, it is a main group element. It shows an intermediate property of metal and non-metal. Thus, it is a metalloid.
- <u>Option 6:</u> Se
Selenium is the 34th element of the periodic table having electronic configuration of
As, the last electron is entering the p subshell, it is a main group element.
- <u>Option 7:</u> Rn
Radon is the 86th element of the periodic table having electronic configuration of
As, the last electron is entering the p subshell, it is a main group element.