true or false: ionic bonding involves the shareing of electrons, oxide ions have a 2+ charge , electrons have a negative charge , a hydrogen molecule is held together by a strong covalent bond between two hydrogen atoms, a covalent bond is a shared pair of electrons.
Answers
Oxide ions have a 2+ charge: This is false, oxide ions have a 2- charge.
Electrons do have a negative charge, this is true.
Hydrogen molecule: pretty sure this is true. We know this because both atoms are non-metals.
The last one is true: a covalent bond is a shared pair of electrons between two atoms, however be aware that there can be more than one covalent bond between two molecules.
Answer:
- False , shared electrons cause covalent bonds
- False , they have 2- charge
- True
- True
- Truw
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Answers
Unknown: V2=?
Formula: V2= V1P1T2/P2T1
Solution: V2= 1.00Lx155kPax398K/605kPax298K
V2= 61,690/180,290=n
Answer: V2= 0.34L is the new volume
73 Draw a structural formula for the ethanol formed during this reaction.
74 Describe how the catalyst, zymase, speeds up this reaction.
75 Determine the total mass of ethanol produced when 270. grams of glucose reacts completely to form ethanol and 132 grams of carbon dioxide.
Answers
H H
l l
H - C - C - OH
l l
H H
74. Activation energy is lowered.
75. Note: MW glucose is 180g/mol ; MW ethanol is 46 g/mol; there is 2 moles of ethanol produced by one mole of glucose.
g glucose= 270 glucose (1mol/180g)(2mole ethanol/1mol glucose)(46g/mol)= 138 g ethanol
Answers
equals 3.265
Answers
Answer : The correct option is A substance that increases concentration when it is dissolved in water.
Explanation :
Arrhenius Definitions :
- Arrhenius Acid : It increases the concentration of hydronium ion
in an aqueous solution. In other words, a substance dissociates in water to form
ion.
- Arrhenius Base : It increases the concentration of hydroxide ion
in an aqueous solution. In other words, a substance dissociates in water to form
ion.
Answer:
b
Explanation:
Answers
Sodium thiosulfate is used as a reducing agent in the Kjeldahl procedure. It is used to prevent the interference of certain substances when determining nitrogen content in organic compounds.
During the digestion step of the Kjeldahl procedure, the organic sample is digested with sulfuric acid. This breaks down the organic compounds and converts the nitrogen present into ammonium sulfate. Some models may contain substances that can interfere with the next analysis. This can lead to inaccuracies in the outcomes.
Using sodium thiosulfate in the modified Kjeldahl procedure minimizes interference from certain compounds. The accuracy of the nitrogen determination is improved. This helps us to ensure that the results obtained are correct and instance of the actual nitrogen content in the sample.
To learn more about Nitrogen, visit here:
Final answer:
The role of Sodium thiosulfate in the modified Kjeldahl procedure is to act as a reducing agent and prevent interference from certain substances, such as nitrites and oxidizing agents, which can affect the accuracy of the nitrogen content determination in organic compounds.
Explanation:
In the modified Kjeldahl procedure, Sodium thiosulfate (Na2S2O3) plays a crucial role as a reducing agent. This procedure is commonly used for the determination of nitrogen content in organic compounds. The addition of Sodium thiosulfate to the reaction mixture serves to prevent interference from certain substances that can react with the reducing agent used in the procedure.
When performing the modified Kjeldahl procedure, it is important to accurately determine the nitrogen content in the sample. However, certain substances, such as nitrites and other oxidizing agents, can interfere with the reaction and affect the accuracy of the results. These interfering substances can react with the reducing agent, leading to inaccurate measurements.
By adding Sodium thiosulfate to the reaction mixture, these interfering substances are neutralized. Sodium thiosulfate acts as a reducing agent, effectively preventing the interference of nitrites and other oxidizing agents. This allows for a more accurate determination of the nitrogen content in the sample.
Learn more about role of sodium thiosulfate in modified kjeldahl procedure here:
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Answers
Answer:
Inert gases
Explanation:
Inert elements have a stable electron configuration meaning their shells/orbitals are full with their requisite number of electrons. Therefore, gaining or losing an electron would take high ionization energy. Therefore they are less likely to be involved in chemical reaction unless a high amount of energy is used. An example of an inert gas is Helium.