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- Question
When a chemical bond is broken energy is
Options- A. transferred
- B. released
- C. used
- D. None of the above
- Correct Answer
- used
ExplanationBond breaking is an endothermic process.
Hence, bond breakage needs an amount of energy and uses some energy based on the strength of the bond to break the bond.
- 1. What important polymer is located in the nucleus?
Options- A. Ribosomes
- B. Chromosomes
- C. DNA
- D. Proteins Discuss
- 2. Which three components are common to all amino acids? Discuss
- 3. What name is given to the bond between water molecules?
Options- A. Polar
- B. Polar covalent
- C. Hydrogen
- D. None of the above Discuss
- 4. Which statement best describes the electronegativity of an element?
Options- A. Electronegativity of an atom is it's ability to produce energy while losing an electron.
- B. Electronegativity of an atom is it's ability to attract electrons during bond formation.
- C. Electronegativity of an atom is it's ability to lose electrons during cation formation.
- D. Electronegativity of an atom is it's ability to share electrons during a covalent bond formation. Discuss
- 5. Which one of the following elements is a transition element?
Options- A. H
- B. As
- C. Fe
- D. Sr Discuss
- 6. 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
- 7. Washing soda is the common name for
Options- A. Sodium Bicarbonate
- B. Calcium Carbonate
- C. Sodium Carbonate
- D. Calcium Bicarbonate Discuss
- 8. Which of the following mixtures is not a colloid?
Options- A. Sugar water
- B. Milk
- C. Paint
- D. Fog Discuss
- 9. 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
- 10. Which are two chemicals used to purify water?
Options- A. Chlorine & Fluorine
- B. Fluorine & Iodine
- C. Chlorine & Hydrogen peroxide
- D. Fluorine & Iodine Discuss
Chemistry problems
Search Results
Correct Answer: DNA
Explanation:
The most important polymer present in the nucleus is DNA- the master molecule. It is a polymer of Nucleotides.
Correct Answer: Any two amino acids vary structure by the r-group, otherwise all amino acids are in the same structure All amino acids have in common carboxyl group -COO , amino group -NH3+ and a hydrogen -H and a r-group which are all bonded to a central carbon
Correct Answer: Hydrogen
Explanation:
The name given to the bond between water molecules is a hydrogen bond. These bonds occur between the slightly negative oxygen of one water molecule and the slightly positive hydrogen of another water molecule. Hydrogen bonding gives water special physical properties.
The differences in electronegativity between hydrogen and oxygen lead to an unequal sharing of electrons. Electronegativity measures how strongly an atom attracts electrons. Oxygen, with its higher electronegativity, pulls on the shared electrons more, giving the oxygen atom a partial net negative charge. The shared electrons spend less time with the hydrogen atoms; therefore, the hydrogen regions of water have partial positive charges.
Correct Answer: Electronegativity of an atom is it's ability to attract electrons during bond formation.
Explanation:
Electronegativity, is a chemical property that describes the tendency of an atom to attract a shared pair of electrons (or electron density) towards itself.
Correct Answer: Fe
Explanation:
In chemistry, the term transition metal has three possible meanings: The IUPAC definition defines a transition metal as "an element whose atom has a partially filled d sub-shell, or which can give rise to cations with an incomplete d sub-shell".
Any of the set of metallic elements occupying a central block (Groups IVB?VIII, IB, and IIB, or 4?12) in the periodic table, e.g. iron, manganese, chromium, and copper. Chemically they show variable valency and a strong tendency to form coordination compounds, and many of their compounds are coloured.
Here in the given options, only iron (Fe) is a transition metal since Strontium is an alkaline earth, arsenic is a metalloid, hydrogen is (normally) a diatomic gas.
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: Sodium Carbonate
Explanation:
Washing soda is the common name for Sodium Carbonate (Na2CO3). It is also called as Soda Ash.
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: Double bond
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.
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