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- Question
Which type of molecules polar or nonpolar dissolves in water?
- Correct Answer
- In general, polar solvents dissolve polar solutes, and nonpolar solvents dissolve nonpolar solutes As water molecules are polar, polar molecules dissolves in water
- 1. When Ionic bonds are formed metallic atoms tend to
Options- A. share electrons
- B. gain electrons
- C. lose electrons
- D. None of above Discuss
- 2. Which is a characteristic of a Mixture?
Options- A. a pure substance
- B. chemically comined
- C. they can be mixed in some fixed ratio
- D. it is either homogenous or heterogenous Discuss
- 3. Which of the following is a property of sodium hydroxide?
Options- A. It is insoluble in ether and other Non-polar solvents
- B. It is slowly soluble in water
- C. It has an odor of rotten egg smell
- D. All the above Discuss
- 4. Molar mass of HNO3?
Options- A. 63 g/mol
- B. 53 g/mol
- C. 48 g/mol
- D. 52 g/mol Discuss
- 5. Ozonolysis of an organic compound gives formaldehyde as one of the products. This confirms the presence of :
Options- A. An acetylenic triple bond
- B. Two ethylenic double bonds
- C. A vinyl group
- D. An isopropyl group Discuss
- 6. Which of the following is a polymer?
Options- A. Glycerol
- B. Amino acid
- C. Nucleic acid
- D. Fatty acid Discuss
- 7. Which formula represents a nonpolar molecule?
Options- A. H2O
- B. CF4
- C. HCl
- D. H2S Discuss
- 8. Which type of molecule is CF4?
Options- A. nonpolar, with a symmetrical distribution of charge
- B. polar, with an asymmetrical distribution of charge
- C. nonpolar, with an asymmetrical distribution of charge
- D. polar, with a symmetrical distribution of charge Discuss
- 9. Formation of curd from milk is chemical reaction.
Options- A. TRUE
- B. FALSE Discuss
- 10. what is the gram formula mass of NH43PO4 ?
Options- A. 139.54
- B. 140.70
- C. 149.08
- D. 153.24 Discuss
Chemistry problems
Search Results
Correct Answer: lose electrons
Explanation:
Ionic bonding is the complete transfer of valence electron(s) between atoms. It is a type of chemical bond that generates two oppositely charged ions. In ionic bonds, the metal loses electrons to become a positively charged cation, whereas the nonmetal accepts those electrons to become a negatively charged anion.
Hence, when Ionic bonds are formed metallic atoms tend to lose electrons and become positive ions
Correct Answer: it is either homogenous or heterogenous
Explanation:
A mixture is the blending of two or more dissimilar substances.
Characteristics of a Mixture:
1. It has No formula.
2. It is an impure sustance
3. They can be mixed in any ratio.
4. The properties of the mixture are the properties of its constituents.
5. Constituents can e easily seperated by physical methods.
eg: Heating, Drying, Crystallization, Distillation etc...
6. It is either homogenous or heterogenous.
A major characteristic of mixtures is that the materials do not chemically combine. Mixtures can be divided into those that are evenly distributed (homogeneous) and those that aren't (heterogeneous).
Correct Answer: It is insoluble in ether and other Non-polar solvents
Explanation:
Sodium hydroxide, also known as lye and caustic soda, is an inorganic compound with the formula NaOH. It is a white solid ionic compound consisting of sodium cations Na+ and hydroxide anions OH?.
Properties:
1. It is highly soluble in water, and readily absorbs moisture and carbon dioxide from the air.
2. NaOH is insoluble in ether and other non-polar solvents.
3. It is an odorless compound.
Uses:
Sodium hydroxide is used in many industries: in the manufacture of pulp and paper, textiles, drinking water, soaps and detergents, and as a drain cleaner.
Correct Answer: 63 g/mol
Explanation:
Calculation of molar mass of HNO3:
Atomic masses of H, N, O are 1, 14, 16 respectively
Now the molar mass of HNO3 is
HNO3 = 1X1 + 1X14 + 3X16
= 1 + 14 + 48
= 63 g/mol or amu.
Correct Answer: A vinyl group
Explanation:
Vinylic group.
Correct Answer: Nucleic acid
Explanation:
Nucleic acid is a polymer among the given options.
Correct Answer: CF4
Explanation:
You have to consider three things.
1. First, are the bonds polar?
Look at differences in electronegativity and if it is >0.5, bonds are polar.
2. Second, does the molecule have unshared electron pairs?
If so, they generally lead to a polar molecule.
3. Third, is the molecule symmetric?
If so, then although the bonds may be polar, the symmetry cancels out the individual bond polarity and the molecule is non polar.
CF4 follows all the rules above and has a symmetric distribution of charge, making it nonpolar. The others all have asymmetric charge distributions.
Hence, CF4 represents a Non-polar molecule.
Correct Answer: nonpolar, with a symmetrical distribution of charge
Explanation:
CF4 is tetrahedral.
Since the four 'F' atoms have the same electronegativity values, there is no bias in electron distribution toward any one.
Therefore, electron/charge distribution is symmetrical, which also means that the molecule is nonpolar.
Hence, CF4 is nonpolar molecule with a symmetrical distribution of charge.
Correct Answer: TRUE
Explanation:
The process of conversion of milk into curd is called fermentation. It is a chemical change. Milk consists of globular proteins called casein. As the microorganism lactobacillus react with milk and turn it to curd. For it 37 degree temperature is needed. But sometimes when it does not get favourable condition, then other microorganism react and makes the curd taste different.
Correct Answer: 149.08
Explanation:
The gram formula mass is nothing but molar mass.
Composition :
Symbol Element Atomic weight Atoms
P Phosphorus 30.973762 1 = 30.973
O Oxygen 15.9994 4 = 63.998
N Nitrogen 14.0067 3 = 42.020
H Hydrogen 1.00794 12 = 12.096
Total = 30.973+63.998+42.020+12.096 = 149.087
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