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- Question
Which three components are common to all amino acids?
- 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
- 1. What name is given to the bond between water molecules?
Options- A. Polar
- B. Polar covalent
- C. Hydrogen
- D. None of the above Discuss
- 2. 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
- 3. Which one of the following elements is a transition element?
Options- A. H
- B. As
- C. Fe
- D. Sr Discuss
- 4. Atomic mass of first 30 elements? Discuss
- 5. Rust forms when _____ reacts with chemicals in rocks.
Options- A. Water
- B. Oxygen
- C. Nitrogen
- D. Carbondioxide Discuss
- 6. What important polymer is located in the nucleus?
Options- A. Ribosomes
- B. Chromosomes
- C. DNA
- D. Proteins Discuss
- 7. When a chemical bond is broken energy is
Options- A. transferred
- B. released
- C. used
- D. None of the above Discuss
- 8. 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
- 9. Washing soda is the common name for
Options- A. Sodium Bicarbonate
- B. Calcium Carbonate
- C. Sodium Carbonate
- D. Calcium Bicarbonate Discuss
- 10. Which of the following mixtures is not a colloid?
Options- A. Sugar water
- B. Milk
- C. Paint
- D. Fog Discuss
Chemistry problems
Search Results
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: Here I give you the first 30 Atomic elements names and their Atomic masses Atomic number Element Atomic mass 1 Hydrogen 1 2 Helium 4 3 Lithium 694 4 Beryllium 901 5 Boron 1081 6 Carbon 1201 7 Nitrogen 1401 8 Oxygen 1599 9 Fluorine 1900 10 Neon 2018 11 Sodium 2299 12 Magnesium 2531 13 Aluminium 2698 14 Silicon 2809 15 Phosphorus 3097 16 Sulphur 3207 17 Chlorine 3545 18 Argon 3995 19 Potassium 3910 20 Calcium 4008 21 Scandium 4496 22 Titanium 4787 23 Vanadium 5094 24 Chromium 24 52 25 Manganese 5494 26 Iron 5585 27 Cobalt 5893 28 Nickel 5869 29 Copper 6355 30 Zinc 6541
Correct Answer: Oxygen
Explanation:
Rust forms when oxygen reacts with chemicals in rocks, and that is often the case with many other elements in general. Like a copper nail being exposed to the air will rust.
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: used
Explanation:
Bond 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.
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.
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