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- Question
Which half reaction correctly represents reduction?
Options- A. Fe2+ + e- ---> Fe3+
- B. Au3+ + 3e? ---> Au
- C. Ag ---> Ag+ + e-
- D. All of the above
- Correct Answer
- Au3+ + 3e? ---> Au
ExplanationA half reaction is either the oxidation or reduction reaction component of a redox reaction. A half reaction is obtained by considering the change in oxidation states of individual substances involved in the redox reaction.
- 1. Which statement about electrons and atomic orbitals is NOT true?
Options- A. An orbital can contain a minimum of two electrons
- B. An electron has the same amount of energy in all orbitals
- C. An atom?s lowest energy level has only two orbitals
- D. All of the above Discuss
- 2. Which statement about weak bonds is correct?
Options- A. Covalent bonds are weak bonds
- B. They are hard to break
- C. Weak bonds are transient and easily reversible.
- D. All of the above Discuss
- 3. Which two atoms form an ionic bond? Discuss
- 4. In a compound, chemical energy is contained in the
Options- A. bonds
- B. movement of the electrons
- C. unbonded electrons
- D. nuclei of the atoms Discuss
- 5. What is the oxidation number of carbon in NaHCO3?
Options- A. -4
- B. -3
- C. +4
- D. +2 Discuss
- 6. Anaerobic glycolysis occurs without
Options- A. water
- B. glucose
- C. oxygen
- D. All of the above Discuss
- 7. What is the main ingredient in face powder?
Options- A. Calcium carbonate
- B. Talc
- C. Magnesium carbonate
- D. China clay Discuss
- 8. The current atomic model would be revised if
Options- A. better microscopes are invented in the future
- B. a new element is discovered in the future
- C. better microscopes were being used to study its structure
- D. new information about an atoms structure is discovered Discuss
- 9. All atoms of the same element have the same
Options- A. number of protons
- B. number of electrons
- C. atomic number
- D. All of the above Discuss
- 10. Which formula represents a molecular compound?
Options- A. Ar
- B. NaI
- C. N2O4
- D. All of the above Discuss
Chemistry problems
Search Results
Correct Answer: All of the above
Explanation:
Yes, all the given statements are NOT true about electrons and atomic orbitals.
True statements are ::
An orbital can contain a maximum of two electrons.
An atom?s lowest energy level has only one orbital.
An electron has different amount of energies in all orbitals.
Correct Answer: Weak bonds are transient and easily reversible.
Explanation:
In chemistry, Weak bonds are those forces of attraction that, do not take a large amount of energy to break.
For example, hydrogen bonds are broken by energies in the order of 4 - 5 kcal/mol.
Ionic bonds, hydrogen bonds and van der Waals interactions are considered weak bonds.
Weak bonds are transient and easily reversible.
Correct Answer: Ionic bonding is a type of chemical bond in which valence electrons are lost from one atom and gained by another This bond generates two oppositely charged ions In ionic bonds, the metal loses electrons to become a positively charged cation, whereas the nonmetal accepts those electrons to become a negatively charged anion Example :: One example of an ionic bond is the formation of sodium fluoride, NaF, from a sodium atom and a fluorine atom In this reaction, the sodium atom loses its single valence electron to the fluorine atom, which has just enough space to accept it The ions produced are oppositely charged and are attracted to one another due to electrostatic forces
Correct Answer: bonds
Explanation:
chemical energy is contained in the chemical bonds between the reactants in the chemical compounds.
Correct Answer: +4
Explanation:
The given compound is NaHCO3 Sodium bicarbonate which is commonly known as Baking soda.
Oxidation numbers are the charges on ions. When a neutral atom loses electrons it becomes positively charged. When a neutral atom gains electrons it becomes negatively charged.
Here the C represents the oxidation state of carbon in this compound. Compounds are electrically neutral, which is why we set the sum of the oxidation states equal to zero.
Sodium has a +1 oxidation state. Hydrogen has a +1 oxidation state. Oxygen has a -2 oxidation state. There are three oxygen atoms, which means the total oxidation state provided by both oxygen ions is -6. Adding up these oxidation states we get:
1 + 1 + (-6) + C = 0
-4 + C = 0
=> C = 4
This means the oxidation state of carbon in this compound is +4.
Correct Answer: oxygen
Explanation:
Anaerobic glycolysis is the transformation of glucose to lactate when limited amounts of oxygen (O2) are available.
Hence, Anaerobic glycolysis occurs without oxygen.
Correct Answer: Talc
Explanation:
Talc or talcum is a clay mineral composed of hydrated magnesium silicate with the chemical formula H2Mg3(SiO3)4 is the main ingredient in face powders that absorbs moisture and oil.
It is also called as French Chalk. Other ingredients include Calcium carbonate (chalk), Magnesium carbonate, China clay, starches like rice and potato, zinc oxide,...
Correct Answer: new information about an atoms structure is discovered
Correct Answer: All of the above
Explanation:
All atoms of an element have the same number of protons. The number of protons in an element is a primary identifier known as its atomic number. The number of electrons is the same as the number of protons.
Correct Answer: N2O4
Explanation:
Molecular compounds are those with covalent bonds between the elements and those elements are typically non metals.
Here in the given options, Ar is an element. NaI has an ionic bond. Hence, N2O4 has a covalent bond between the two non metals and is a molecular compound.
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