Answer:
evaluating the desing
Explanation:
O helium
hydrogen
Oxygen
Olithium
Answer:
Oxygen
Explanation:
The electrons present in an atom are arranged in shells or orbitals. The electrons are filled into these shells based on their energy levels with those shells closest to the nucleus filled first as they have the lowest energies.
The arrangement of electrons around the nucleus of an atom is known as electronic configuration. The outermost electron shell of an atom is known as a valence shell shell and the electrons found in this shell are known as valence electrons. The electrons usually exist in pairs. The first shell can only contain two electrons; the second shell can contain 8. the electrons are singly filled first before pairing occurs.
The electronic configuration of the atoms of the elements in the option are as follows:
Helium : 1s² ; valence electrons are 2 which are both paired
Hydrogen: 1s¹ ; valence electron is 1
Oxygen : 1s²2s²2p⁴ ; valence electrons are 6 wit two unpaired electrons
Lithium : 1s²2s¹ ; valence electron is 1
Helium has two valence electrons but they are paired as its 1s shell can only contain a maximum of two electrons.
Oxygen has 6 valence electrons. Two of these electrons are paired while the other two are unpaired.
Answer:
In chemistry, solvent effects are the influence of a solvent on chemical reactivity or molecular associations. Solvents can have an effect on solubility, stability and reaction rates and choosing the appropriate solvent allows for thermodynamic and kinetic control over a chemical reaction.
Explanation:
b. secrete hormones directly into the bloodstream.
c. are instrumental in producing myelin, which protects the neurons.
d. secrete neurotransmitters into the brain.
Answer:
B.secrete hormones directly into the bloodstream
Answer:
Galactose
Explanation:
Galactose is a sugar with six carbons and one aldehyde group present at the end. The presence of a free aldehyde group in galactose makes it a reducing sugar. Galactose can reduce the Cu2+ of Benedict solution into Cu+ and produce a red precipitate. Sorbitol, β-ethylglucoside, and gluconate do not have aldehyde group to reduce Cu2+ ions and therefore, do not give the positive test with Benedict solution.
(B) ribosomes
(C) mitochondria
(D) chromosomes
When compared to a cheek cell, a muscle cell contains more ribosomes and mitochondria (Option B and Option C).
In conclusion, when compared to a cheek cell, a muscle cell contains more ribosomes and mitochondria (Option B and Option C are correct).
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Muscle cells contain more mitochondria compared to cheek cells.
When compared to a cheek cell, a muscle cell generally contains more mitochondria (option C). The reason for this difference lies in the cells' respective functions. A muscle cell requires a larger amount of energy to contract and exert force, and mitochondria are the organelles that produce ATP, the cell's primary energy source. Consequently, muscle cells need a high concentration of mitochondria to meet their energy demands.
Contrastingly, cheek cells (epithelial cells) primarily serve to protect and seal off the body, and to absorb and secrete substances. They don't have as heavy energy demands as muscle cells do, and therefore generally have fewer mitochondria. Both cell types have similar numbers of vacuoles, ribosomes, and chromosomes as they are essential to general cellular processes and not specific to cell types.
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b. False
Answer:
True
Explanation:
Phnacetin can be produced using Williamson-ether synthesis. In this, phenacetin is derived from acetaminophen and the reaction involve interaction of alkoxide or phenoxide with a methyl or primary alkyl halide
In amide synthesis mechanism, acetic anhydride and phenetidine (p-ethoxyaniline) react to phenacetin through a nucleophilic acyl substitution
Hence, the given statement is true