CHEMISTRY HIGH SCHOOL

Give the percent yield when 28.16 g CO2 are formed from the reaction of 8.000 moles of C8H18 with 4.000 moles of O2.2C8H18 + 25O2 > 16CO2 + 18H2O

A) 20.00%
B) 25.00%
C) 50.00%
D) 12.50%
E) 100.0%

Answers

Answer 1
Answer:

The correctanswer between all the choices given is the 4th choice or letter D. I amhoping that this answer has satisfied your query and it will be able to helpyou in your endeavor, and if you would like, feel free to ask another question.

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Count the total number of atoms in sio2:

Answers

Atoms are the basic units of matter and the defining structure of elements. We count the number of atoms by the total number of elements present in the compound. In this case, we have 1 atom of Si and 2 atoms of oxygen which would have 3 total number of atoms.

What volume measured in stp will 3.75 grams of helium gas occupy?

Answers

1 mole of any gas will occupy 24dm^3 or 24000cm^3 as one mole of helium weighs 4g it will occupy just under 24000cm^3

As an atom becomes an ion, its mass number(1) decreases(2) increases(3) remains the same

Answers

As an atom becomes an ion, its mass number \boxed{\left( 3 \right){\text{ remains the same}}}  

Further explanation:

The smallest unit of an element is called an atom. It is also known as the building block of matter. An atom is generally represented as _{\text{Z}}^{\text{A}}{\text{X}}, where X is the symbol of the element, A is its atomic mass or mass number and Z is its atomic number.

The number of protons present in the atomic nucleus is termed as the atomic number (Z) whereas the total number of nucleons present in the nucleus of an atom is called mass number or atomic mass (A).

When electrons are either gained or lost from the neutral atom, it results in the formation of ions. Cations are the positively charged ions that are formed due to the removal of electrons from the neutral atom. Anions are the negatively charged ions that result from the addition of electrons to the neutral atom.

Since the formation of either type of ion requires gain or loss of electrons but mass number is the total number of protons and neutrons present in the atomic nucleus, the mass number remains the same when ions are formed from their respective ions. Therefore option (3) is the correct answer.

Consider an example of a sodium atom whose atomic number is 11 so it has an electronic configuration of 1{s^2}2{s^2}2{p^6}3{s^1}. It loses one electron to form its monovalent ion, {\text{N}}{{\text{a}}^ + } which has the configuration of 1{s^2}2{s^2}2{p^6}. The number of electrons in Na is 11 while that in {\text{N}}{{\text{a}}^ + } is 10. But both the species have same number of protons and neutrons in them. So the mass number remains unchanged if an atom forms its ions.

Learn more:

1. Component of John Dalton’s atomic theory: brainly.com/question/2357175

2. Basis of investigation for the scientists: brainly.com/question/158048

Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Atomic structure

Keywords: atom, matter, atomic nucleus, proton, electron, neutron, cations, anions, Na, 11, Na+, electronic configuration.
Becoming an ion involves gaining or losing electrons
Electrons have a relative mass of 0
So adding or removing them doesn't change the mass of the atom
So the answer is (3) remains the same

Which actions would increase the rate at which salt dissolves in water? Stir the water. Crush the salt. Use less water. Heat the water. Cool the salt.

Answers

Answer:

Crushing or grinding increases the surface area of the salt that is exposed to the molecules of water. Stirring increases the speed at which the particles of salt come in contact with the water molecules.

_____ is a halogen used in gaseous and liquid form for large scale disinfection of drinking water and sewage. A. Iodine B. Chlorine C. Bromine D. Fluorine E. Betadine

Answers

Answer:

Chlorine

Explanation:

Chlorine is a halogen that is a strong oxidizer (it takes electrons from nearby compounds).  In so doing, it kills bacteria, viruses, and other microorganisms.  The chlorine reacts with cell walls or other vital organic compounds (e.g., proteins)  to render them useless.  Chlorine is relatively inexpensive and generally easy to handle, but it is dangerous in gaseous form and highly alkaline in solution, so must be stored and handled properly.

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Answers

It depends on what you are separating from the liquid. If it is a solid you can just filter it or put it in a centrifuge. If it is a dissolved solvent you might need to use something like chromatography. I am not very sure though. I hope this helps. Let me know if anything is unclear.
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