Discussion
Home ‣ General Knowledge ‣ Chemistry Comments
- Question
Atoms of the same element can differ in
Options- A. Atomic number
- B. Atomic mass
- C. electrons
- D. None of the above
- Correct Answer
- Atomic mass
ExplanationAtoms of the same element can have same atomic number and number of electrons since, the atomic number is the number of protons and the number of protons and eectrons are the same in an element.
Hence, the atoms of the same element may differ in their atomic mass since it depends on the number of neutrons it holds and such atoms are called isotopes.
- 1. Which are two chemicals used to purify water?
Options- A. Chlorine & Fluorine
- B. Fluorine & Iodine
- C. Chlorine & Hydrogen peroxide
- D. Fluorine & Iodine Discuss
- 2. Which chemical bond most likely stores the most energy?
Options- A. Single bond
- B. Double bond
- C. Both A & B
- D. None of the above Discuss
- 3. Which of the following mixtures is not a colloid?
Options- A. Sugar water
- B. Milk
- C. Paint
- D. Fog Discuss
- 4. Washing soda is the common name for
Options- A. Sodium Bicarbonate
- B. Calcium Carbonate
- C. Sodium Carbonate
- D. Calcium Bicarbonate Discuss
- 5. Which of the following definitions describes a chemical hazard?
Options- A. Microorganisms, such as bacteria, fungus, mold, or viruses that can cause illness
- B. These hazards can lead to injuries to the joints or muscles by way of heavy, frequent lifting, repetitive tasks
- C. Can be present in dust, fumes, liquids, solids, mists, vapors, or gases of products used at a site or released during a construction job
- D. The most commonly thought of hazards for construction Discuss
- 6. What types of atoms form covalent bonds?
Options- A. metal and metal
- B. metal and non metal
- C. non metal and non metal
- D. All of the above Discuss
- 7. Which molecule is nonpolar and has a symmetrical shape?
Options- A. NH3
- B. HCl
- C. H2O
- D. CH4 Discuss
- 8. The chemical name of common salt is
Options- A. Calcium Chloride
- B. Potassium Chloride
- C. Sodium Chloride
- D. Magnesium Chloride Discuss
- 9. Which is the best definition of activation energy?
Options- A. the energy required to break the bonds of reactant molecules
- B. the energy required to end a chemical reaction
- C. the energy required to bind a substrate to an active site
- D. the energy required to re-form bonds in product molecules Discuss
- 10. Which of the following reactions are redox reactions?
Options- A. Ba(s)+Cl2(g)--->BaCl2(s)
- B. Mg(s)+Br2(l)--->MgBr2(s)
- C. Al(s)+3Ag^+(aq)--->Al^3+(aq)+3Ag(s)
- D. All of the above Discuss
Chemistry problems
Search Results
Correct Answer: Chlorine & Hydrogen peroxide
Explanation:
Removing the contaminents if any in the water which causes harm to our health is involved in the purifying of water.
This process involves chemicals. Chloramines, Hydrogen peroxide, Iodine are the chemicals which are used in purifying water.
Correct Answer: Double bond
Correct Answer: Sugar water
Explanation:
Colloids include gels, sols, and emulsions; the particles do not settle, and cannot be separated out by ordinary filtering or centrifuging like those in a suspension.
These Colloid substances consists of ultramicroscopic particles of one substance dispersed through another substance from which we cannot separate them.
Sugar water is not a colloid and it is a solution in which we can separate them.
Correct Answer: Sodium Carbonate
Explanation:
Washing soda is the common name for Sodium Carbonate (Na2CO3). It is also called as Soda Ash.
Correct Answer: Can be present in dust, fumes, liquids, solids, mists, vapors, or gases of products used at a site or released during a construction job
Correct Answer: non metal and non metal
Explanation:
Covalent bonds are bonds formed between two non metals by sharing of electrons in their outer most orbits for stable.
Correct Answer: CH4
Explanation:
Among the given options, CH4 is a non polar molecule with symmetrical tetrahedral shape.
Correct Answer: Sodium Chloride
Explanation:
The chemical name of common is sodium chloride. Its chemical formula is NaCl.
Correct Answer: the energy required to break the bonds of reactant molecules
Explanation:
Activation energy is a minimum amount of energy that required for the chemical reaction to happen or to take place.
Correct Answer: All of the above
Comments
There are no comments.More in General Knowledge:
Programming
Copyright ©CuriousTab. All rights reserved.