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- Question
Isotopes are atoms of the same element that have different
Options- A. numbers of neutrons
- B. numbers of electrons
- C. numbers of protons
- D. atomic numbers
- Correct Answer
- numbers of neutrons
ExplanationIsotopes are variations of an element that have the same charge as the original element, but a different mass, which is caused by either more/less neutrons in the nucleus.
- 1. What element behaves most like magnesium?
Options- A. Silicon
- B. Strontium
- C. Sulphur
- D. Tin Discuss
- 2. Dry ice is nothing but
Options- A. Solid carbon dioxide
- B. Baking soda
- C. Gaseous carbon dioxide
- D. Carbon monoxide Discuss
- 3. Which compound forms a colored aqueous solution?
Options- A. CrCl3
- B. KBr
- C. CaCl2
- D. NaOH Discuss
- 4. Is steel a compound?
Options- A. TRUE
- B. FALSE Discuss
- 5. Which choice best describes the polarity of BrF5?
Options- A. nonpolar bonds / nonpolar molecule
- B. nonpolar bonds / polar molecule
- C. polar bonds / polar molecule
- D. polar bonds / nonpolar molecule Discuss
- 6. Ketchup stored in a tin can may lead to chemical contamination.
Options- A. TRUE
- B. FALSE Discuss
- 7. Systematic name for (CuI)s ?
Options- A. Copper Iodide
- B. Cobalt Fluoride
- C. Ferrous Oxide
- D. All of the above Discuss
- 8. Which statement about subatomic particles is not true?
Options- A. Protons and neutrons have the same charge
- B. Protons and electrons have the opposite charhes
- C. Protons and neutrons have almost the same mass
- D. All of the above Discuss
- 9. Which of the following is not a property of water?
Options- A. Low density
- B. Low specific heat
- C. Low heat of vaporisation
- D. All of the above Discuss
- 10. Covalent bonds are formed when electrons are
Options- A. Transfer of electrons
- B. Sharing of electrons
- C. Dividing of electrons
- D. All of the above Discuss
Chemistry problems
Search Results
Correct Answer: Strontium
Explanation:
We know that, Elements in the same group of the periodic table have similar characteristics.
Here Magnesium and Strontium shared some similar properties because they both belong to the same group. Sr is the chemical symbol for strontium which is a group two element; it has atomic number of 38.
Correct Answer: Solid carbon dioxide
Correct Answer: CrCl3
Explanation:
Colored aqueous solutions are a characteristic of transition compounds.
The only transition compound in the above choices is CrCl3.
Cr is a transition element.
Correct Answer: FALSE
Explanation:
Steel is not a compound or element. Steel is an alloy of iron and carbon and other elements and hence it is a mixture. Because of its high tensile strength and low cost, it is a major component used in buildings, infrastructure, tools, ships, automobiles, machines, appliances, and weapons.
Correct Answer: polar bonds / polar molecule
Correct Answer: TRUE
Explanation:
The given statement is True.
Ketchup is acidic, having a pH of 3.9. The acidic component, acetic acid, will react with the metal tin. This reaction will result in a metal acetate that will contaminate the ketchup.
Hence, The acetic acid in the ketchup will react with the metal tin, forming a metal acetate that will pass into the ketchup which leads to its contamination.
Correct Answer: Copper Iodide
Explanation:
Copper Iodide is the systematic name of the given compound (CuI)s.
Correct Answer: Protons and neutrons have the same charge
Correct Answer: All of the above
Explanation:
Water can moderate temperature because of the two properties: high-specific heat and the high heat of vaporization.
Hence, all the above given options are not the properties of water.
Correct Answer: Sharing of electrons
Explanation:
Covalent bonding occurs when pairs of electrons are shared by atoms. Atoms will covalently bond with other atoms in order to gain more stability, which is gained by forming a full electron shell. By sharing their outer most (valence) electrons, atoms can fill up their outer electron shell and gain stability.
Examples of compounds with covalent bonds ::
HCl, CO2, O2,...
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