CHEMISTRY HIGH SCHOOL

Which particles are gained and lost during a redox reaction?(1) electrons (3) neutrons
(2) protons (4) positrons

Answers

Answer 1
Answer: Electrons are Loss (Oxidation) and Gain (Reduction) in a Reduction-Oxidation (Redox) reaction.

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Calcium has an atomic number of 20. How many electrons does calcium lose when forming an ionic bond with another ion?a. 1 b. 2 c. 3 d. 4
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What can be said about the polarity of the C=O bond? A) C and O have the same electronegativity; the bond is nonpolar B) the C=O bond is polar; the O atom bears a partial negative charge C) the C=O bond is nonpolar; the C atom bears a partial positive charge D) the C=O bond is polar; the C atom bears a partial negative charge

Which of the following is not found in the nucleus of an atom? A. Neutron
B. Electron
C. Proton
D. Quark

Answers

Electron -  In an atom, the central part which is composed of neutrons and protons including quarks is called the nucleus. Whereas the electron is the particle with negative elementary electric charge can be found inside the atom surrounding the nucleus. 

Answer: electrons

Explanation:

because it is

Calculate the mass of 139 cm^3 Argon at STP

Answers

Volume in liters:

139 cm³ / 1000 = 0.139 L   

molar mass Argon = 39.95 g/mol

1 mole -------- 22.4 L ( at STP )
? mole ------- 0.139 L

moles of argon :

0.139 * 1 / 22.4 = 0.00620 moles 

Mass of argon :

0.00620 * 39.95 = 0.24769 g

hope this helps!

Which is the molar mass of BF3?10.81 g/mol
29.81 g/mol
48.81 g/mol
67.81 g/mol

Answers

 The molar mass of BF3  is  67.81  g/mol


  Explanation

  •  Molar mass   is the  mass  of all  atoms  in a molecule  in gram per  mole.
  • molar mass  of a molecule is calculated by adding  atomic mass  of constituent  atom
  • use the periodic table  to determine the atomic mass of each element in the  molecule.

that is;

         atomic mass of B = 10.81 g/mol

         atomic  mass of F  = 19 g/mol

  • since there 3 atoms  of F  in BF3 the  atomic massof F in BF3=  3 x19  =  57 g/mol
  • total molar  mass of BF3 = 10.81 g/mol + 57 g/mol = 67.81  g/mol

67.81  g/mol is the molar mass of BF_3 . Therefore, the correct option is option D among all the given options.

The ratio among the mass with the quantity of substance (measured within moles) in any sample of a compound of chemicals is known as the molar mass (M) in chemistry. The molar mass of a material is a bulk attribute rather than a molecular one. The compound's molecular weight is an average over numerous samples, which frequently have different masses because of isotopes. A terrestrial average or a function of the relative proportion of the isotopes of the component atoms on Earth, the molar mass is most frequently calculated using the standard atomic weights.

atomic mass of B = 10.81 g/mol

atomic  mass of F  = 19 g/mol

atomic massof F in BF_3=  3 x19  =  57 g/mol

total molar mass of BF_3 = 10.81 g/mol + 57 g/mol = 67.81  g/mol

Therefore, the correct option is option D.

To know more about molar mass, here:

brainly.com/question/31545539

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Mrs. Rushing fills a balloon with hydrogen gas to demonstrate its ability to burn. Which combination could sheuse to produce the hydrogen she needs?

NaOH and oil

Zn and KOH

H2SO, and CaCO

0 Mg and HCI

I’ll mark your reply if the answer was correct.

Answers

Answer:

Its D

Explanation:

I took the Unit Test on Edge

Answer:

D. Mg and HCl

Hi i need hel does any one know what P3N2 means ??? .-.

Answers

P=phosphorus
N=nitrogen
P3N2 is triphosphorus dinitrogen (a covalent compound)

If 21.3 grams of lithium react with excess water, how many liters of hydrogen gas can be produced at 297 Kelvin and 1.40 atmospheres? Show all of the work used to solve this problem. 2Li (s) + 2H2O (l) yields 2LiOH (aq) + H2 (g

Answers

Hope it helped you.
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