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- Question
Which formula represents a molecular compound?
Options- A. Ar
- B. NaI
- C. N2O4
- D. All of the above
- Correct Answer
- N2O4
ExplanationMolecular 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.
- 1. 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
- 2. 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
- 3. What is the main ingredient in face powder?
Options- A. Calcium carbonate
- B. Talc
- C. Magnesium carbonate
- D. China clay Discuss
- 4. Anaerobic glycolysis occurs without
Options- A. water
- B. glucose
- C. oxygen
- D. All of the above Discuss
- 5. Which half reaction correctly represents reduction?
Options- A. Fe2+ + e- ---> Fe3+
- B. Au3+ + 3e? ---> Au
- C. Ag ---> Ag+ + e-
- D. All of the above Discuss
- 6. Give a possible molecular formula for C3H5ClO?
Options- A. C6H10Cl2O2
- B. C6H10O2
- C. C6H10ClO2
- D. C6H12Cl2O2 Discuss
- 7. A by product of involuntary muscle contraction and relaxation is
Options- A. Oxygen
- B. Water
- C. Heat
- D. Nitrogen Discuss
- 8. The mass of a mole of NaCl is the
Options- A. 58.44 gm/mol
- B. 57.25 gm/mol
- C. 56.31 gm/mol
- D. 59.14 gm/mol Discuss
- 9. Compounds are formed as a result of chemica change.
Options- A. TRUE
- B. FALSE Discuss
- 10. Identify the metalloid in the following list?
Options- A. Silicon
- B. Sulphur
- C. Scandium
- D. All of the above Discuss
Chemistry problems
Search Results
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: new information about an atoms structure is discovered
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: 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: Au3+ + 3e? ---> Au
Explanation:
A 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.
Correct Answer: C6H10Cl2O2
Correct Answer: Heat
Correct Answer: 58.44 gm/mol
Explanation:
To get the mass of a mole of NaCl, we need to add the molar atomic weights of the individual elements i.e, Na and Cl
Atomic weights of Na = 22.99 gm/mol Cl = 35.45 gm/mol
Now, mass of a mole of NaCl = 22.99 + 35.45 = 58.44 gm/mol.
Correct Answer: TRUE
Explanation:
TRUE, the compounds are formed as a result of chemical change.
Correct Answer: Silicon
Explanation:
A metalloid is an element with properties between metals and non metals or the mix of both.
The six metalloids are arsenic, silicon, germanium, boron, antimony and tellurium.
Hence, silicon is the only metalloid in the given list.
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