Final answer:
To calculate the mass and volume of alcohol based on its density, we use basic principles of chemistry. The mass of 35.25 mL of alcohol is found to be approximately 27.69 g, and 125.4 g of the same alcohol would occupy approximately 159.65 mL.
Explanation:
The question involves calculating the mass of a certain volume of alcohol given its density and vice versa. First, we find the density of the alcohol using the initial 20 mL sample which weighs 15.71 g. The density (ρ) is mass (m) divided by volume (V), so ρ = 15.71 g / 20 mL = 0.7855 g/mL. Using this density, we can find the mass of 35.25 mL of the same alcohol which would be ρ * V = 0.7855 g/mL * 35.25 mL = 27.687375 g. To find the volume 125.4 g of this alcohol would occupy, we use V = m / ρ = 125.4 g / 0.7855 g/mL = 159.65 mL.
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Which of the following is not an example of a molecule?
a)KOH b)H2S c)O3 d)Mn
Its mn i just did the test 2.10 molecules for good
Within the atmosphere as the altitude increases?
Answer:
Within the atmosphere, as altitude increases,
A.air pressure stays the same.
B.air becomes heavier.
C.air pressure decreases. The answer.
D.air pressure increases.
Explanation:
That's the question. AND Pressure with Height: pressure decreases with increasing altitude. The pressure at any level in the atmosphere may be interpreted as the total weight of the air above a unit area at any elevation. At higher elevations, there are fewer air molecules above a given surface than a similar surface at lower levels. Hope that helps. This means the answer is C.
What is the volume, in cubic centimeters, of a sample of cough syrup that has a mass of 50.0 g? The density of cough syrup is 0.950 g/cm^3
Perspective influences how a person looks at a piece of art and its qualities.
a.
always true
c.
always false
b.
sometimes true
d.
Perspective is not relevant in the interpretation of art.
the molar mass of nitrogen gas is 28.0g/mol. A 100.0-g sample of air contains how many moles of nitrogen
What is the number of moles of atoms in 1.035 kg of lead
Answer:-
5 mol of Lead
3.01 x 10^24 atoms of Lead
Explanation:-
Mass of lead = 1.035 kg x 1000 = 1035 g
Atomic mass of Lead = 207.2 g mol-1
Number of moles of lead = Mass / atomic mass
= 1035 g / 207.2 g mol-1
=5 mol
By Avogadro's Law we know 1 mol of an element has 6.02 x 10^23 atoms
So 5 mol of Lead has 5 x 6.02 x 10^23
= 3.01 x 10^24 atoms of Lead
After data are collected, they are often arranged in a(n)
The fossil record provides evidence of past life as well as clues to the past climate, environment, and abiotic factors in an area. True or false
The fossil record provides evidence of past life as well as clues to the past climate, environment, and abiotic factors in an area. This statement is true.
What is abiotic factor ?Abiotic elements, also known as abiotic factors, are non-living chemical and physical elements of the environment that have an impact on the health of living things and the operation of ecosystems. Biology as a whole is supported by abiotic causes and the phenomena that go along with them.
Abiotic variables including water, sunshine, oxygen, soil, and temperature are crucial.
Abiotic factors are non-living elements like water, soil, and atmosphere, whereas biotic factors are live entities found in an ecosystem including plants, animals, and bacteria. In an ecosystem, how these elements interact is crucial.
Thus, The fossil record provides evidence of past life as well as clues to the past climate, environment, and abiotic factors in an area. This statement is true.
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what conditions are represented by the abbreviation stp
STP, or standard temperature and pressure, is defined as 0°C (273.15 K) and 1 atm pressure, allowing for standardized comparison of gas properties.
Explanation:The conditions represented by the abbreviation STP, which stands for standard temperature and pressure, are specifically chosen to provide a reference point for the comparison of the physical properties of gases. Generally, STP is defined as a temperature of 0°C or 273.15 K and a pressure of 1 atm (atmosphere).
However, it is important to note that there are slight variations in this definition, as some organizations like the International Union of Pure and Applied Chemistry (IUPAC) define STP as 0.986 atm, while for simplicity, others may use the rounded value of 1 atm. Despite this, the concept of STP is invaluable for scientists as it allows for standardized comparisons across various gas measurements.
Which changes of the state takes place when an igneous rock turns into sedimentary rock?
which of these is an example of food engineering
Answer: Using fertilizer on crops to increase their yield
Explanation: Apex
what is 273 minus the boiling point of water?
The empirical formula for a compound is CH2. If n is a whole number, which shows a correct relationship between the molecular formula and the empirical formula?
why is there a limited number of compounds that can be formed by the elements in the periodic table
Final answer:
The limited number of compounds formed by elements is determined by their atomic structure, stability preferences, and the octet rule governing valence electrons, along with the fixed number of known elements (approximately 118). These factors lead to a finite, yet extensive, number of chemical bonds and stable compounds. The periodic table's organization reflects these bonding possibilities and limitations.
Explanation:
Why There is a Limited Number of Compounds
The reason there is a limited number of compounds that can be formed by the elements in the periodic table is due to the fixed set of elemental combinations governed by their atomic structures and bonding capabilities. For instance, the noble gas elements, which have eight valence electrons except for helium, do not form compounds easily, indicating high stability with full outer shells. This observation leads to the octet rule, suggesting that compounds often form because atoms seek the stability of a full valence shell comprising eight electrons.
Furthermore, the periodic table showcases a finite number of elements, with only about 118 known to us, resulting in a finite, although vast, number of possible combinations and chemical bonds. These limits are inherent to the properties of electrons and their configurations in atoms. As chemists, we observe that certain combinations of atoms form stable compounds while others do not, influenced by the electronic arrangement, chemical reactivity, and periodic trends.
The structure of the periodic table itself, which arranges elements by increasing atomic number and distinct chemical properties such as metallicity, governs how and which elements can combine. Therefore, even with millions of known compounds resulting from the combination of these elements, the intrinsic properties of elements and the laws of chemistry dictate the limits to the variety and types of bonds that can form robust compounds.
6.285×103 mg = __________ kg. Express your answer with the appropriate number of significant figures.
Which two structures would provide a positive identification of a plant cell under a microscope?
A: Cell wall,mitochondria
B: Plasma membrane , large central vacuole
C: Ribosomes, chloroplast
D: Cell wall, chloroplast
The answer is D: Cell wall, chloroplast
How do I know? I took the same test before
and it was Cell wall, chloroplast. Hope you get an A!
how many moles of glucose are contained in 8.3 x 10^21 molecules of glucose
Final answer:
To find the number of moles of glucose from 8.3 x 10^21 molecules, divide by Avogadro's number (6.022 x 10^23), resulting in approximately 0.01378 moles of glucose.
Explanation:
To determine how many moles of glucose are contained in 8.3 x 1021 molecules of glucose, we must use Avogadro's number, which is 6.022 x 1023 molecules per mole. The calculation is as follows:
Number of moles = Number of molecules ÷ Avogadro's number
Number of moles = 8.3 x 1021 molecules ÷ 6.022 x 1023 molecules/mol
Number of moles ≈ 0.01378 moles
So, there are approximately 0.01378 moles of glucose in 8.3 x 1021 molecules of glucose.
Which electromagnetic wave has the longest wavelength?
In term of molecules explain what happen to a sugar cube when it is placed into a beaker of water
The molecules of sugar will dissolves completely in water when the sugar cube is placed in it and it forms a homogeneous solution.
What is solution?A solution is formed when a solute dissolves in a solvent. For example salt when dissolved in water forms the salt solution. The solute can be partially or completely soluble in the solvent.
The solute if completely miscible in the solvent and no phase separation occurs there such as in salt solution, it is called homogenous solution.
Whereas, in some solutions, the solute only partially dissolves in the solvent and forms a phase separation from solvent. Suc solution are called heterogeneous solution.
The solubility of solute depends on the mass, bond type, temperature etc. Here, the sugar molecules are completely soluble in water. Water can forms hydrogen bonds with the OH groups of sugar molecules and it forms a homogeneous solution.
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Ethylene glycol is used as an antifreeze in car. if 400 g of ethylene glycol is added to 4.00 kg of water, what is the molaity? calcualte how much the freezing point of water will be lowered. The freezing point depression constant for water is Kf=-1.86
30) Some common substances used in the laboratory are listed in the table. The chemical formulas of the substances are also listed beside their names.
How many of the listed items are elements?
A) 3
B) 4
C) 5
D) 6
Please Please Please hurry need help
The answer is c 5
Bahafbssna
The data from one particular experiment do not agree with a current theory. What is the next step?
Answer:
The correct answer will be-repeat the data to verify and support the results.
Explanation:
The scientific theory is based on the repeated experiments which provide and support the theory.
If the data from the new experiment or any particular experiment does not support the theory then the step to be performed will be to repeat the experiment with the same protocol by different experimenters.
This repetition of the experiment increases the efficiency of the data and help determine whether the data can act as evidence of the theory or not.
Thus, repeat the data to verify and support the results is the correct answer.
Three metal spoons are on table. They are at room temperature. If the three spoons touch.
A. Heat will flow among the three spoons
B. Heat will flow between two spoons
C. No heat will flow among the spoons
D. Heat will flow from the spoons to the air
C. No heat will flow among the spoons
Which of the following is an adaptation found in many desert plants? A. large, flat leaves B. dormant period during the winter C. fuzzy growth on leaves D. wide-spreading, shallow roots
Which of these is a example of a chemical reaction that occurs at a very fast rate
A.Rotting Wood
B.An Explosion
C.Photosynthesis
D.Iron Rusting
Kaboom. an explosion, because since you lit the fuse, the sparks go off while the fuse get shorter and shorter and then when the use goes into the bomb itself, the Gunpowder Ignites really really fast causing pressure to become higher and higher causing the bomb itself to not contain it and so, it goes kaboom, and shrapnel, A bunch of small metal spikes, Go out in all directions.
So my answer is B: An Explosion. (You're welcome)
at a nuclear power plant plants a nuclear chain reaction releases heat which drives steam turbines that turn what
In a nuclear power plant, the heat from nuclear fission reactions converts water to steam, which then turns a turbine connected to a generator to produce electricity.
At a nuclear power plant, a controlled nuclear chain reaction takes place in the reactor core which releases a substantial amount of heat. This heat is utilized to convert water into steam. The high-pressure steam is then directed to drive a turbine, which, in turn, spins and activates a generator.
The generator is a crucial component as it is responsible for transforming the kinetic energy generated by the turning turbine into electrical energy which we use as electricity. Therefore, a nuclear chain reaction releases heat, which in turn generates steam driving a turbine that is ultimately connected to a generator for electricity production.
Which of the following methods can be used to separate salt and iron? Distillation Evaporation Filtration Magnetism
From a mixture of salt and iron, iron can be easily separated using a magnet if they are present as solid fillings. Thus option D is correct.
What is magnetism?Magnetism is the ability of a magnet to produce its own magnetic field and attracts magnetically susceptible objects into it. Iron is can acts as a magnet and it easily attracted by a magnet.
There are different methods for separating individual components from a mixture of them. The separation method is selected based on the physical properties of these substances.
From a mixture of salt and iron, iron can be easily separated using a magnet and all the iron fillings can be collected on to a magnet. Remaining salt can then be purified by dissolving in water and then evaporates off. Hence, option D is correct.
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jenny want to determine if a new brand name wahing detergent is better than her old detergent.she washes ten dirty t-shirts with her new washing detergent and ten dirty t-shirts with the old detergent.identify the dependant and independent variables for this experiment
hint:consider what the treatment is in the experiment
Listed in the Item Bank are a number of key events from this field. Some events have more details available when you click on them. Drag and drop the events in chronological order by placing each in its corresponding open rectangle. If there is overlapping, simply trace the dashed line down to the timeline for clarification.
ITEMBANK: Move to Bottom
Brown recognizes and names the cell nucleusHooke coins the word cell after viewing cork cells with primitive microscopePasteur disproves spontaneous generation and proposes germ theorySchleiden & Schwann propose cell theoryVirchow describes cell division; proposes that all cells arise from other cellsvan Leeuwenhoek discovers bacteria with his improved microscope
The chronological order of key events in cell biology begins with Hooke's coining of 'cell' in 1665, followed by van Leeuwenhoek's discoveries related to bacteria in the 1670s, Brown's identification of the cell nucleus in 1831, Schleiden & Schwann's cell theory in 1838, Virchow's description of cell division in 1855, and Pasteur's germ theory later in the century.
Explanation:The key events from the field of cell biology should be organized in the following chronological order:
Robert Hooke coined the term 'cell' in 1665 when he observed cork tissue under a microscope.
In the 1670s, Antonie van Leeuwenhoek improved upon the microscope and was able to discover bacteria and protozoa.
Much later in 1831, Robert Brown identified and named the cell nucleus.
In 1838, Schleiden & Schwann proposed the cell theory which states that all living organisms are composed of cells.
Rudolf Virchow in 1855 described cell division and proposed that all cells arise from other cells.
Finally, Louis Pasteur in the late 19th century disproved spontaneous generation and proposed the germ theory.
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In a chemical reaction, which are the MOST LIKELY products of these reactants? 4Fe + 3O2 ?
Answer : [tex]Fe_2O_3[/tex] is the product.
Explanation :
Balanced chemical reaction : It is defined as the number of atoms of individual elements present on reactant side must be equal to the product side.
The species present on the left side of the right arrow are known as reactant and the species present on the right side of the right arrow are known as product.
When iron react with oxygen to give iron(III) oxide as a product.
The balanced chemical reaction will be,
[tex]4Fe+3O_2\rightarrow 2Fe_2O_3[/tex]
In this reaction, [tex]Fe[/tex] and [tex]O_2[/tex] are the reactants and [tex]Fe_2O_3[/tex] is the product.