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- Question
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
- Correct Answer
- the energy required to break the bonds of reactant molecules
ExplanationActivation energy is a minimum amount of energy that required for the chemical reaction to happen or to take place.
- 1. The chemical name of common salt is
Options- A. Calcium Chloride
- B. Potassium Chloride
- C. Sodium Chloride
- D. Magnesium Chloride Discuss
- 2. Which molecule is nonpolar and has a symmetrical shape?
Options- A. NH3
- B. HCl
- C. H2O
- D. CH4 Discuss
- 3. 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
- 4. Atoms of the same element can differ in
Options- A. Atomic number
- B. Atomic mass
- C. electrons
- D. None of the above Discuss
- 5. Which are two chemicals used to purify water?
Options- A. Chlorine & Fluorine
- B. Fluorine & Iodine
- C. Chlorine & Hydrogen peroxide
- D. Fluorine & Iodine Discuss
- 6. 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
- 7. A solution that is hypotonic to a cell has
Options- A. more water molecules surrounding the cell than inside the cell
- B. more water molecules inside the cell than outside the cell
- C. equal water molecules inside and outside the cell
- D. None of the above Discuss
- 8. Liquid sodium is being considered as
Options- A. engine coolant
- B. bleaching agent
- C. antiseptic
- D. None of the above Discuss
- 9. Conductivity in a metal results from the metal atoms having
Options- A. highly mobile electrons in the valence shell
- B. high electronegativity
- C. high ionization energy
- D. highly mobile protons in the nucleus Discuss
- 10. Which of the following is not a strong acid?
Options- A. H2SO4
- B. CH3COOH
- C. HCl
- D. HBr Discuss
Chemistry problems
Search Results
Correct Answer: Sodium Chloride
Explanation:
The chemical name of common is sodium chloride. Its chemical formula is NaCl.
Correct Answer: CH4
Explanation:
Among the given options, CH4 is a non polar molecule with symmetrical tetrahedral shape.
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: Atomic mass
Explanation:
Atoms 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.
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: All of the above
Correct Answer: more water molecules surrounding the cell than inside the cell
Correct Answer: engine coolant
Explanation:
Liquid sodium is being considered as engine coolant.
Correct Answer: highly mobile electrons in the valence shell
Explanation:
The outer most electrons that are free to move are called valency electrons that are responsible for the conductivity in the metal atoms.
Correct Answer: CH3COOH
Explanation:
CH3COOH, chemically known as Acetic acid, is not a strong acid among the given acids like Sulphuric acid, Hydrochloric acid,...
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