Answer:
E. THE SHARING OF ELECTRONS BETWEEN ATOMS
Explanation:
Covalent bonds are formed by sharing of electrons between the two reacting atoms so that a stable octet structure can be attained. The electron pair is called shared pair and each atom contributes an electron of the shared pair of electron.
Molecules are formed by covalent bonding and not ions. Examples of covalent bonds are hydrogen molecule (H2), Chlorine molecule (Cl2), water molecule (H2O).
Covalent compounds usually dissolve in non-polar solvents and not polar solvents (water), most covalent compounds do not conduct electricity.
Dative bonding is different from normal covalent bindings as the shared pair is donated by only one of the participating atom in coordinate covalent bonding.
Answer:
136.36 mL
Explanation:
Here we have to use the dilution formula
From C1V1= C2V2
Where;
C1= initial concentration of the solution= 12.0 M
C2= final concentration of the solution= 2.20 M
V1 = initial volume of the solution= 25.0 ml
V2= final volume of the solution= ?????
Then recall;
C1V1=C2V2
V2 = C1V1/C2
Substituting values from the parameters given;
V2= 12.0 × 25.0 / 2.20
V2= 136.36 mL
Answer: False
Explanation:
Metal oxides that dissolve in water, react with water to form basic solutions.
Nonmetal oxides react with water to form acidic solutions.
False. The nature of the solution actually depends on the type of metal oxide. Not all metal oxides will make water acidic when mixed.
The statement that mixing metal oxide with water will result in an acidic solution is generally false.
Actually, the nature of the solution (acidic, basic, or neutral) after mixing metal oxide with water depends on the type of metal oxide. Some metal oxides, particularly those of alkali metals and alkaline earth metals (Group 1 and 2 in the Periodic Table), form basic solutions when dissolved in water. For instance, sodium oxide or magnesium oxide will react with water to form their respective hydroxides, which are basic in nature.
However, certain metal oxides like aluminum oxide or zinc oxide may react with water to form amphoteric solutions (can behave as both acids and bases).
Thus, not all metal oxides will make the water acidic when mixed.
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Answer:
2.5 meter per second
Explanation:
momentum = mass multiplied by velocity
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This reaction occurs more quickly when powdered iron is used instead of a single piece of iron of the same mass because the powdered iron
(1) acts as a better catalyst than the single piece of iron
(2) absorbs less energy than the single piece of iron
(3) has a greater surface area than the single piece of iron
(4) is more metallic than the single piece of iron
Answer: Option (3) is the correct answer.
Explanation:
One of the important factor on which rate of reaction depends is surface area. That is, when a compound is crushed into powdered form then there will be increase in surface area of the compound.
Hence, now more number of particles can interact, therefore, there will be increase in rate of reaction.
Thus, we can conclude that reaction occurs more quickly when powdered iron is used instead of a single piece of iron of the same mass because the powdered iron has a greater surface area than the single piece of iron.
energy input
equilibrium
exchange reaction
Answer: Coal Dust
Explanation: Grounded-up coal, coal dust, is used in explosives.