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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what will happen if you add more solute to a saturated solution
All living things are made of organic compounds which contain the element
A) carbon. B) hydrogen. C) oxygen.
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.
PLEASE ANSWER ASAP!!!!! Object A has a mass of 12 g and a volume of 8 cm3. Object B has a mass of 20 g and a volume of 8 cm3. Which object has a greater density and by how much? A: Object A, by 1 gram per cubic centimeter B: Object A, by 8 grams per cubic centimeter C: Object B, by 1 gram per cubic centimeter D. Object B, by 8 grams per cubic centimeter
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
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!
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)
(science Q.1)
please help
Which changes of the state takes place when an igneous rock turns into sedimentary rock?
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
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.
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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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.
Both white phosphorus and red phosphorus are made up only of phosphorus atoms.Does this mean they are both pure substances? Could they be compounds?
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?
Calculate the vapor pressure lowering on an aqueous solution of glycerin that contains 180g of glycerin and 1000g of water at 25c. The vapor pressure of water at this temperature is 23.8torr.
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.
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.
which of these is an example of food engineering
Answer: Using fertilizer on crops to increase their yield
Explanation: Apex
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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 are two ways non metalic minerals can be used?
A. Wiring and Gems
B. Conductors and for industrial purposes
C. Gems and as conductor
D. Industrial processes and gems
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
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
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 273 minus the boiling point of water?
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
Reactions rates for reactions occurring in solution can be increased by increasing the concentration of the solution. With gases you can do something similar, which is to -
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 of the following is true about two neutral atoms of the element zinc?
They will always have different masses. Electrons are missing in both the atoms. Both have an equal number of protons. They have different properties.
Final answer:
Neutral zinc atoms will always have the same number of protons, designated by the atomic number (Z) which is 30. While the number of neutrons can differ, creating various isotopes with different masses, the chemical properties of these isotopes are the same. Thus, the factual statement is that both atoms have an equal number of protons.
Explanation:
The question you've asked pertains to the nature of zinc atoms. Neutral atoms of zinc, like all other elements, will have the same number of protons, which is determined by the element's atomic number (Z). For zinc, the atomic number is 30, meaning that each zinc atom has 30 protons.
One of the key points to understand is that the number of neutrons can differ in atoms of the same element, leading to different isotopes of that element. This means that while the number of protons (and electrons in a neutral atom) remains constant, the number of neutrons can vary, affecting the mass number (A) of the isotopes. However, this does not change the chemical behavior of the isotopes since they still have the same number of protons.
Given these fundamental principles, let's review your statements about two neutral atoms of zinc:
They will not always have different masses since two neutral atoms of zinc can be the same isotope.Electrons are not missing in both the atoms if they are neutral; they will have the same number of protons and electrons.Both have an equal number of protons since this defines the element zinc.They do not have different properties simply because they are isotopes; isotopes of an element share similar chemical properties.Therefore, the correct statement regarding two neutral atoms of zinc is that both have an equal number of protons.