(a) vacuole (c) chloroplast
(b) nucleus (d) cell membrane
Explanation:
The student most likely observed both (A) Vacuole and (C) Chloroplast that led him to the conclusion, that the cell is a plan cell.
Reason :
In a plant cell, Vacuole occupies 70% to 90% of the total volume of the cell, making it easier to identify.
Chloroplast contains photosynthetic pigment called chlorophyll (green in colour), which is only found in plant cell.
The presence of chloroplasts, containing green pigment chlorophyll for photosynthesis, in the cell likely led the student to conclude it was a plant cell.
The student likely made his conclusion based on observing the presence of chloroplasts in the cell. Chloroplasts contain a green pigment called chlorophyll, which enables plants to undergo photosynthesis and is not found in animal cells. The others listed (vacuoles, cell membrane, and nucleus) are also present in animal cells and therefore would not specifically indicate a plant cell.
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Answer:
To calculate the volume of the approximately 0.014 M copper (II) sulfate solution needed to prepare 100.00 milliliters of a 0.00028 M copper (II) sulfate solution, you can use the formula:
(Volume 1)(Concentration 1) = (Volume 2)(Concentration 2)
So, rearranging the formula, you can solve for Volume 1 (the volume of the 0.014 M solution):
Volume 1 = (Volume 2)(Concentration 2) / Concentration 1
Plugging in the values:
Volume 1 = (100.00 milliliters)(0.00028 M) / 0.014 M
Volume 1 ≈ 2.00 milliliters
Approximately 2.00 milliliters of the approximately 0.014 M copper (II) sulfate solution are needed to prepare 100.00 milliliters of a 0.00028 M copper (II) sulfate solution.
B. The greater the dipole moment, the stronger the dipole-dipole forces.
C. The polarizability of elongated molecules is greater than that of compact, more spherical molecules.
D. London dispersion forces weaken in the order Xe < Kr < Ar
E. Hydrogen bonding leads to the strongest intermolecular forces.
Answer:
D. London dispersion forces weaken in the order Xe < Kr < Ar is an incorrect order, the correct order of London dispersion forces weaken in the order Ar < Kr < Xe.
Explanation:
A. Dispersion forces are present in all molecular substances.
is a correct statement London dispersion forces are weak intermolecular forces found in all molecular substances.
B. Clearly, greater the dipole moment, greater will be dipole-dipole forces. Hence true.
C) The polarizability of elongated molecules is greater than that of compact, more spherical molecules. The more elongated the molecule is more will be its ability to get polarized.
D. London dispersion forces weaken in the order Xe < Kr < Ar is an incorrect order, the correct order of London dispersion forces weaken in the order Ar< Kr < Xe.
E) Hydrogen bonding leads to the strongest intermolecular forces is also a correct statement. Hydrogen bonding leads to increase in boiling point.
The correct scientific notation form of the number 5,489.6654 using only 2 significant figures is: 5.5 * 10³
Scientific notation is a way to represent very large or very small numbers in a more concise and manageable format. It consists of two parts: a coefficient and an exponent of 10.
In your given number, 5,489.6654, we want to express it in scientific notation using only 2 significant figures. Significant figures are the digits in a number that contribute to its precision.
Identify the significant figures: From the given number, we have two significant figures, which are 5 and 4.
Determine the coefficient: To represent the number in scientific notation, we want the coefficient to be between 1 and 10. In this case, we can round the number to 5.5 (rounding the 8 up).
Determine the exponent of 10: To express the number 5.5 in scientific notation, we need to move the decimal point in the original number to the right by one place.
Learn more about scientific notation
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Answer:
5.4 × 10^3.
Explanation:
Not 5.49 × 10^3, 5.4 × 10^7, or 5.5 × 10^3.
Answer:
A. 120m
Explanation:
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