which of the salts below, when dissolved in water, will form a basic solution? sodium chloride, nacl sodium acetate, nac2h3o2 ammonium bromide, nh4br calcium nitrate, ca(no3)2
Sodium acetate will form the basic salt when dissolved in water.
Water turns basic when a salt made from a strong base and a weak acid dissolves in it. Sodium ions and acetate ions are created when sodium acetate dissociates in water. There are no acidic or basic characteristics in the sodium ion. The conjugate base of acetic acid, the acetate ion, has a high affinity for H+ ions.
The solution turns acidic when a salt made from a potent acid and a feeble base dissolves in water. Chloride ions and ammonium ions are created when ammonium chloride dissociates. No affinity exists between the chloride ion and H+ ions.
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how can I got oxygen from water and collect it
Explanation:
through the process of electrolysis.
electricity (loose electrons under "pressure") is sent through water allowing the oxygen atoms to bind enough electrons to become independent O2 molecules and detach from water molecules, hence "freeing" themselves as oxygen gas. which in turn also creates free H2 molecules and therefore hydrogen gas.
the free oxygen collects at the positive electrode, the free hydrogen at the negative electrode.
an additional option is to collect the free oxygen that is simply mixed into the water and allows fish to "breathe" (the gills do NOT break oxygen out of the H2O molecules but use the mixed-in free O2 oxygen between the H2O molecules).
that is the reason why a fish tank needs the constant air stream bubbling through the water (or we would have to constantly stir the water in the tank rigorously), and why truly still water bodies "die" (any originally mixed-in oxygen leaves over time, literally suffocating any oxygen-needing lifeforms in those bodies of water).
to capture this, cool the water down to about 4° C (about 39° F), at which point water has its greatest density (below that water expands again preparing for the larger volume needed by the crystalline grid of water ice). that pushes/squeezes a lot of the mixed-in elements incl. free oxygen out of the water.
but that is very little compared to an electrolysis result.
which french chemist noticed that uranium salts could fog photographic plates, even without being exposed to sunlight?
In March 1896 Antione Henri Becquerel (French chemist) discovered that the uranium mixture would introduce radiation even if it was not exposed to an exposed light.
UraniumHenri Becquerel made a chemical compound of the element Uranium (potassium uranyl sulfuric acid crystals) and produced a light glow around it. This compound is then placed on a dry photographic plate wrapped in thin black paper. It turns out that this light causes sensitivity to the dry plate photo
In 1896, Becquerel accidentally discovered radioactivity while observing the phosphorescence of uranium salts, a discovery by Wilhelm Rontgen. X-rays used a cathode-ray tube to produce X-rays. Becquerel wondered whether X-rays could not be produced by exposing ordinary sunlight to non-metallic substances. Coincidentally, Becquerel also discovered for the first time that this new type of radiation would be transmitted by any uranium chemistries. Since the radiation did not depend in any way on the chemical form of the uranium, Becquerel realized that the radioactivity was not of chemical origin, but had to be from the uranium atoms themselves.
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Consider the hydrocarbon with chemical formula C₁0H8; this compound is an...
alkyne.
alkane.
alkene.
aromatic.
Please help :)
C₁OH₈ formula is an alkene hydrocarbon in the nature of its existence.
What are hydrocarbons?
The only two types of atoms that make up all of an organic complex called a hydrocarbon are carbon and hydrogen. The majority of the time, hydrocarbons are colourless gases with hardly detectable odours. Alkanes, alkenes, alkynes, and aromatic hydrocarbons are the four subcategories that are generally used to classify hydrocarbons. These compounds can have relatively simple structures or relatively complex structures.
The study of hydrocarbons can shed light on other functional groups' chemical composition and behaviour. Liquefied petroleum gas, which is derived from hydrocarbons like propane and butane, is also employed as a source of fuel for commercial reasons (LPG). One of the most basic aromatic hydrocarbons, benzene, is used as the starting point for the creation of numeroubrainly.com/question/17578846s synthetic medications.
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if you were asked to design a metal support bracket for a shelf, which of the strengths studied in this lab would you use to determine the design strength? why might you use a safety factor? explain your reasoning.
The safety factor describes how much more robust a system is than is necessary for the load that is intended.
The shape, dimensions, and holes of a metal support bracket determine its strength. Static loading, bracket material Designing a metal support bracket that is strong depends on the metal's thickness and profile. Thus, strength is determined by shape, size, and holes. The bracket's material not only determines its strength, but it also has the ability to withstand rusting. Static loading examines the amount of load the bracket can support before deflection to evaluate the strength. utilising the safety factor .
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The figure below shows a sealed balloon containing helium.
The balloon is squashed so its volume decreases.
No helium enters or leaves the balloon.
What happens to the density of the helium in the balloon?
When a sealed balloon containing Helium is squashed so its volume decreases, and no helium enters or leaves the balloon the density of the Helium in the balloon increases.
What is the explanation for the above?Note that the expression or equation for density is:
Density = Mass/ Volume
But we know that the mass of the Helium Atom is Constant.
Lets assume that is is 1,
Hence,
Density = 1/V
Hence, if V reduces, D increases creating an inverse relationship.
Note that the term density refers to how much space an item or substance occupies (its volume) in proportion to the amount of matter in that thing or substance (its mass). Density may also be defined as the quantity of mass per unit of volume.
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You have 132. 4 mL of a 2. 50 M solution of Na2CrO4(aq). You also have 125 mL of a 2. 50 M solution of AgNO3(aq). Calculate the concentration of Na after the two solutions are mixed together
the concentration of Na after the two solutions are mixed together is 0.662 M.
1. Volume of Na2CrO4 = 132.4 ml = 0.1324 L.
2. Concentration of Na2CrO4 = 2.50 M
3. Volume of AgNO3 = 125 ml = 0.125 L
4. Concentration of AgNO3 = 2.50 M.
Calculation :-
1. Moles of Na2CrO4 = Molarity * Volume in L.
Moles of Na2CrO4= 2.50 * 0.1324 = 0.331 mol
2. Moles of AgNO3 = Molarity * volume in L
Moles of AgNO3 = 2.50 * 0.125 = 0.3125 mol
Solution :
the reaction of aqueous silver nitrate (AgNO3) with aqueous sodium chromate (Na2CrO4) to form solid silver chromate (Ag2CrO4) and aqueous sodium nitrate (NaNO3).
2 AgNO3(aq) + Na2CrO4 (aq) \rightarrow Ag2CrO4(s) + 2 NaNO3(aq).
Above balanced reaction shows that,
2 moles of AgNO3 reacts with 1 mol Na2CrO4.
Let, 0.3125 mol AgNO3 reacts with x mol Na2CrO4.
x = 0.3125 / 2
x = 0.1563 mol Na2CrO4.
Now,
1. Balanced reaction shows that,
2 mol AgNO3 forms 2 mol NaNO3.
So, 0.3125 mol AgNO3 forms 0.3125 mol NaNO3.
So, moles of NaNO3 = 0.3125 mol.
As 1 molecule of NaNO3 gives 1 Na^+ ion.
0.3125 mol NaNO3 gives 0.3125 mol Na^+ ions...... A
Aslo,
2. remaining moles of Na2CrO4 = total moles - used moles
Remaining moles of Na2CrO4 = 0.331 - 0.1563 = 0.1748 mol.
1 molecule of Na2CrO4 gives 2 Na^+ ions.
So, 0.1748 moles of Na^2+ ions gives 0.3496 mol Na^+ ions............ B
3.So, total moles of Na^+ ions= 0.3496 + 0.3125......(from A and B)
Total moles of Na^+ ions = 0.662 mol.
So, concentration of Na^+ ions = 0.662 M.
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list the three fundamental particles of matter and indicate the mass change associated with each
These protons, neutrons and electrons are the three fundamental particles of atoms
What is atom ?
The atom is the smallest unit of matter that may be divided without releasing electrically charged particles. It is also the lowest unit of matter that has chemical element features. As a result, the atom is the fundamental building block of chemistry.
Examine various electron configurations in electron shells surrounding an atom's nucleus.
The majority of the atom is empty space. The rest of the structure is made up of a positively charged nucleus of protons and neutrons surrounded by a cloud of negatively charged electrons. In comparison to electrons, the lightest charged particles in nature, the nucleus is small and dense.
The mass of an electron is approximately 9.109382911 1028 gramme. A proton or neutron has a mass that is approximately 1,836 times greater. This explains why the mass of an atom is governed mostly by the mass of its protons and neutrons in its nucleus.
Mass of protons, m
p =1.67×10 −27 kg
Mass of electrons, m
e =9.11×10 −31 kg
∴ m e
mp≈1836
The proton to electron mass ratio is represented by μ or β. It is a dimensionless quantity.
μ= m e
mp≈1836
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What is the density if the mass is 25 grams and the volume is 100 cm cubed?
A. 4 g/cm^3
B. 25 g/cm^3
C. .25 g/cm^3
D. .4 g/cm^3
Answer:
C. .25 g/cm^3
Explanation:
density = mass ÷ volume
25÷100
0.25
Which object will have the smallest change in motion when an equal force is applied?
8 kg circle
6 kg square
4 kg triangle
5 kg rectangle
The object will have the smallest change in motion when an equal force is applied is 8kg circle.
What is force?A force is described as an influence that can change the motion of an object.
A force can cause an object with mass to change its velocity or to change its acceleration. Force can also be described intuitively as a push or a pull. A force has both magnitude and direction, making it a vector quantity.
The object will have the smallest change in motion when an equal force is applied is 8kg circle because according to Newton's second law which states that the rate of change of momentum of an object is directly proportional to the net force acting on it, provided that the mass of the body is kept constant.
This means that as mass increases, force will increase. However, if acceleration is negative, then force will just increase by the same amount in the opposite direction.
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Energy of an object due to the kinetic energy of its atoms is called...
Elastic
Thermal
Radiant
Chemical
Answer: thermal
Explanation: I remembered
when a substance exhibits resonance, we say that none of the individual lewis structures accurately portrays the bonding in the substance. why do we draw resonance structures?
The class of Lewis structures known as resonance structures depicts the movement of bonds and lone pairs through various configurations. Resonating structures are produced by the complete transfer of electrons during delocalization from one atom to the following atom. We can infer from this that the distribution of charges is distributed evenly across the molecule, rather than being concentrated at a single location. The electrons are not concentrated around the sigma bond, as shown by resonance structures. The entire molecule now has a high electron charge density. The preferred representation of the molecule is displayed by the resonance structures. The collection of structures suggests that the pi bond's electrons are distributed evenly throughout the molecule and are not concentrated at any one point. Following the octet rule, resonating structures indicate that the atom
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when 14 gm of CO gas reacted with an excess amount of oxygen the volume of produced CO2 at STP is. ?
Answer:
22.4 liters
Explanation:
1 Mole of gas occupies 22.4 Litres of volume at STP.
Given, the mass of CO=14 g
Molar mass of CO=12+16=28 g
No. of moles of CO=
28
14
=0.5 Moles
So, CO occupies 0.5×22.4=11.2 L at STP.
What is the reaction for this equation? FeClz +
Na3PO4 →
Fe3(PO4)2
+
NaCl
The balanced chemical equation for the reaction FeCl2 + Na3PO4 -----> Fe3(PO4)2 + NaCl is 3FeCl2 + 2Na3PO4 ------> 6NaCl + Fe3(PO4)2.
What is a balanced chemical equation?
Balanced chemical equation is the equation of a reaction in which both reactant and product sides are equal in the number of atoms or molecules. The total charges on both the sides should be equal.
The given reaction can be made into balanced chemical equation by counting the number of atoms on both the sides. If the atoms of a particular element is less on either sides then multiply the whole molecule by a number which balances the number of atoms on the either sides of the reaction.
Therefore, the balanced chemical equation of FeCl2 + Na3PO4 -----> Fe3(PO4)2 + NaCl can be written as 3FeCl2 + 2Na3PO4 ------> 6NaCl + Fe3(PO4)2.
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Which of the following is a regulating service provided by ecosystems?
Multiple choice question.
cross out
A)
the water cycle
cross out
B)
pollination
cross out
C)
food production
cross out
D)
natural resources
One of the regulating services provided by the ecosystem is pollination. Option B.
What are ecosystem services?Ecosystem services are natural processes that are maintained by the ecosystem but which benefit man and mankind.
There are different types of services offered by the ecosystem and that benefit man immensely. These are:
Provisional services: which include food, raw materials, drugs, and so on.Regulating services: including the regulation of important processes such as pollination, decomposition, carbon storage, etc.Cultural service: non-material benefits that man derives from the ecosystem. Such as recreation, music, etc. Supporting services: such as water cycle, nutrient cycle, etc.The ecosystem plays a regulatory role in the pollination of plants for the benefit of mankind. Wind helps to carry pollens from the anther to the stigma of flowers. By doing so, fruits, vegetables, seeds, etc, become available for the use of man.
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Which play borders the philippine plate
The plates which borders the great philippine plate are the:
The Pacific platesThe Sunda platesThe Eurasia platesHow are the Pacific, Sunda and Eurasia plates borders the philippine plate.It follows that all the plates which have the sea Philippines plates bordered have one thing in common. They are all defined by means of convergent boundaries. In order words, the Pacific, Sunda and Eurasia plates border the philippine plate are produced by different plates which are converging towards each other in several directions.
In conclusion, we can now know that one of the major plates which borders the sea philippines plate is the Pacific plates.
Complete question:
Which plates borders the philippine plate?
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why is a double or triple bond needed? select all that apply. serves as a source of electron density serves as a nucleophile serves as an electrophile serves as a source of electron deficiency
The double or triple bond are needed because as they serves as a source of electron density and serves as a nucleophile.
The double bond or triple bond are electron rich entities capable of donating electrons thus act as nucleophile (species that donate electrons) and serve as electron dense region in molecules.
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what term is commonly used to describe foods that are grown with little or no use of synthetic chemicals?
Organic food is the term that is commonly used to describe foods that are grown with little or no use of synthetic chemicals.
How is organic food grown?Organic food is food grown by farmers and farmers according to organic farming practices.Organic farming practices include using organic pesticides, limiting the use of synthetic products, avoiding irradiation, promoting ecological balance and conserving biodiversity.Organic foods have many advantages because they are nutritious, not contaminated with synthetic chemicals such as growth hormones, and not genetically modified.Organic foods include fresh produce, meats, dairy products, and processed foods such as crackers, beverages, and frozen foods.What is organic farming?Organic farming in India is an agricultural process that uses organic fertilizers and pesticides made from animal or vegetable waste. This agriculture began to respond to environmental problems caused by chemical pesticides and synthetic fertilizers. A new agricultural system that restores, maintains and improves the balance of ecosystems.
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which of the following element pairs would be most likely to form an ionic compound? a) hydrogen; carbon b) nitrogen; oxygen c) oxygen; carbon d) calcium; carbon e) sodium; potassium
Among the above given element pairs none of them are likely to form ionic compounds
Ionic bonds are basically the electrostatic attractions formed between oppositely charged ions in an ionic compound. Generally ionic bonds are often formed when electrons are transferred from metal atom to a non metal atom.
We can say that ionic bond is most likely formed between metal and nonmetal elements .
In the above given electron pairs none of the pairs given are likely to form ionic compounds as none of the pair is of a metal and a nonmetal. An element can be classified as a metal if its found on the left side of the periodic table while non metals are located on the right of the periodic table.
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what is the solubility of ca(oh)2 (s) in water, given that the ksp is 6.5 x 10-6. molar mass of ca(oh)2 is 74.09 g/mol. g
8.7M Is the solubility of Ca(oh)2 in water at a given Ksp of 6.5 .10-6 and molar mass of 74.09g/mol.
Solubility is defined as the amount of the substance dissolved in a given amount of solvent at a certain temperature.
Ca(OH)2 à Ca2+ + 2OH-
Ksp = 6.5 .10-6
Molar mass= 74.09 g/mol
Ksp is solubility product constant which describes the equilibrium between a solid and its ion in solution.
Ksp=[Ca2+] [OH2-]
6.5 .10-6 = S. (74.09g/mol +S)
6.5 .10-6 = S .( 74.09M)
S = 6.5 .10-6 /74.09 M
= 8.7 M
So, the solubility of Ca(OH)2 is 8.7M.
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an atom of hydrogen consists of an electron of mass in circular orbit at uniform speed v. the orbital radius is
An electron of mass travelling in a circular orbit with a constant speed of v makes up a hydrogen atom. The orbital radius is 5*10^- 11 meters. The lepton particle family's first generation includes electrons.
In a hydrogen atom, the electron orbits the nucleus in a circle with a radius of 5*10^- 11 metres. It lasts for 1.5*10^16 seconds. The electron motion is accompanied by a current (electromagnetic charge: 1.6*10^19 C).
The electron is a subatomic particle with the symbol e or and an electric charge of one elementarily negative charge of hydrogen atom. Because they are thought to be elementary particles and do not have any known components or substructure, electrons are part of the first generation of the lepton particle family.
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How many moles is 1.2
×
1023 atoms of Ne?
Answer:
the answer would be 7.584*10^23
Determine the mechanism and product for the given reaction by adding atoms, bonds, nonbonding electron pairs, and curved arrows. Acid and water are added in the second step.
The mechanism and product for the given reaction after adding acid and water in the second step will result in the production of phenylpropanol.
The missing reaction scheme of the question is attached as a picture:
As a result of the reaction between benzaldehyde with diethyl ether (Et2O) and MgBr an intermediate results. This intermediate then reacts with hydronium to produce phenylpropanol. The hydronium ion generates as a reaction between the water molecule and a strong acid. Acid donates its proton to the water molecule. This hydronium ion then donates this proton to the resulting intermediate. The complete mechanism is attached:
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What is the best use of probability in genetics?
A. To calculate the possible blood types of offspring
B. To exactly predict the the traits each offspring will have
C. To better parents' chances of having female or male offspring
D. To determine how many offspring parents will have
Answer: B
Explanation: Genetics has to do with genes, which is appearance, which is hereditary from the parent :)
after 200 million years, only 1/16 of the original amount of radioactive atoms in a sample remains. the half-life of this radioactive isotope is how many years? show all of your work, including unit labels, and clearly label each step.
The half life of the radioactive isotope is 25 million years.
The half life of the substance - The half life of the substance is the time taken by the substance to decay to its half concentration of the initial value.
All the radioactive reaction follows first order kinetics,
So, it means that,
If in 200 million years, only 1/16 of the original amount of the radio active atoms in a sample.
It means before 100 million years, the amount of the radioactive atoms were 1/8.
similarly, 50 million years, the amount of the radio active atoms were 1/4.
Continuing the pattern, 25 million years, the amount of the radio active atoms were 1/2.
So, after 25 million years, the amount of radioactive atoms in the sample left are 1/2 of the original amount.
So, the half life of the sample is 25 million years.
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how long did your addition of the acid mixture take? how much ethanol did you use for the recrystallization? what did your nitroacetanilide crystals look like? how long did you dry the final solid before taking the mass and melting point?
Recrystallization ; 25 mL of solvent are needed at 100 oC to dissolve 100 mg of the chemical. 75 mg of the chemical will precipitate at 0 oC while 25 mg will remain in solution.
what did your nitroacetanilide crystals look like? how long did you dry the final solid before taking the mass and melting point?The chemical compound para nitroacetanilide, commonly known as 4-nitroacetanilide, is a nitroacetanilide derivative made from acetanilide and a nitrating combination. A trace of ortho product also forms along with the para product.
Through nitration, the chemical molecule p-nitroacetanilide is created from acetanilide. P-nitroacetanilide is created when acetanilide is treated with a nitrating mixture, which is a combination of nitric acid and sulfuric acid. O-nitroacetanilide is also generated as a small byproduct along with p-nitroacetanilide. It is quite simple to separate p-nitroacetanilide through crystallization since o-nitroacetanilide is highly soluble in alcohol.
Because ethanol is endlessly cosoluble with water and has high dissolving properties for many organics, ethanol and water mixtures are frequently utilized. Many organic compounds' solubilities can be drastically and quickly decreased by the addition of water, which can cause crystallization.
The solution may become too diluted for crystals to form if you add too much solvent. The flask needs to be gently cooled, first at room temperature and then in cold water. Impurities will be captured by a hastily formed crystal's lattice. Smaller crystals will be produced as a result.
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Plant and animal cells are very similar, but they also contain certain differences. how are plant and animal cells different? choose three correct answers.
The plants and animal cells are different because:
-Vacuoles are much larger in plant cells than in animal cells because they hold more water to stay upright
-Plant cells have cell walls to provide a stronger external structure and animal cells do not.
-Special organelles called chloroplasts are found in plant cells and not in animal cells to allow them to produce their own food.
In the field of biology, cells can be described as the building blocks from which all life forms on Earth are built.
Plant cells have chloroplast through which light energy can be trapped. This light energy is used by plants to make their own food. The animal cells lack chloroplast because they do not make their own food.
Plants cells have the cell wall as the outermost covering whereas animal cells do not have a cell wall. The outermost covering of the animal cells is the cell membrane only.
A plant cell has a single, large vacuole in the middle of the cell that is used for maintaining turgidity and storing water. Animal cells do not have smaller and numerous vacuoles.
Although a part of your question is missing, you might be referring to this question:
Plant and animal cells are very similar, but they also contain certain differences. how are plant and animal cells different? choose three correct answers.
Vacuoles are much larger in plant cells than in animal cells because they hold more water to stay upright
Animal cells contain a nucleus and plant cells do not
Plant cells have cell walls to provide a stronger external structure and animal cells do not.
Plant and animal cells are both completely the same and they have no differences.
Special organelles called chloroplasts are found in plant cells and not in animal cells to allow them to produce their own food.
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What are the advantages and disadvantages of using:
a volumetric pipette
a measuring cylinder
gas syringe
burette
a weight balance
Answer:
there are used to where large volumes are needed to be transferred and coloured graduated marks make it easier to measure the volumes. the disadvantage isthat they are not so precise and there are greater changes of human error
write two uses of echoes
Echo: When a sound wave is created in the air, some of it is reflected back to the listener while some of it is absorbed after hitting a reflector. Echo is the name for this reflected sound.
Utilizations for Echo:
1. Bats use the echolocation method to find their way because they are unable to see with their eyes. Bats can determine whether an object is in front of a sound by listening to how it is reflected. It uses this method when hunting its prey.
2. This method is also employed to determine undersea distance and ocean depth.
3. Estimating the separation between hills and mountains is also helpful.
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Hydrogen sulfide (H2S) is combined with zinc (Zn). The equation for the reaction is shown below.
H2S + Zn → H2 + ZnS
What happened during this reaction?
A zinc atom formed bonds with two hydrogen atoms.
A sulfur atom formed bonds with two hydrogen atoms.
A zinc atom formed a bond with one sulfur atom.
Bonds between a zinc atom and two hydrogen atoms were broken.
Bonds between a sulfur atom and two hydrogen atoms were broken.
The correct option are option C,E that is bonds between a sulfur atom and two hydrogen atoms were broken. Zinc atom formed a bond with one sulfur atom.
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.
In the give reaction, bonds between a sulfur atom and two hydrogen atoms were broken. zinc atom formed a bond with one sulfur atom.
Therefore, the correct option are option C,E.
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