Answer:
The real answer is ...................... .
three test tubes, labeled a, b, and c, contain substances with approximately the same melting points. how could you prove that the test tubes contain three different chemical compounds? what is the minimum number of melting points needed to be determined?
If there are the three different compounds present in three test tubes with approximately same melting points.
What is melting point?Melting point, temperature at which the solid and the liquid forms of a pure substance can exist in equilibrium. As heat is applied to a solid, its temperature will increase until melting point is reached. More heat then will convert solid into a liquid with no temperature change.
When all solid has melted, the additional heat will raise the temperature of the liquid. The melting temperature of crystalline solids is a characteristic figure and is used to identify the pure compounds and elements. Most mixtures and amorphous solids melt over a range of the temperatures.
The melting temperature of a solid is generally considered to be same as the freezing point of the corresponding liquid; because a liquid may freeze in different crystal systems and because the impurities lower the freezing point, however, the actual freezing point may not be the same as the melting point. Thus for characterizing a substance, melting point is preferred. See also melting.
If there are the three different compounds present in three test tubes with approximately same melting points. Firstly, if the melting point of each sample has been recorded thrice. It will result small difference in the readings. along with this is not necessary that three compounds with nearly same melting point have same solubility. The three components can be identified as different from their solubility in the various solvents.
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An atom has 4 protons and 2 electrons this is an atom of the element_____ since protons are _____ and electrons are______this atom has a charge of?
Answer:
element: Beryllium
protons are: positive
electrons are: negative
charge on this atom: 2+
Explanation:
The net movement of molecules from a region where their initial concentration is higher to a region where their initial concentration is lower is called.
Answer:
It is Diffusion
There are 8 computers in the computer lab that each have 20 gb hard drives. how many bytes ( b. of disk space do we have in the computer lab in total.
Converting gigabytes(GB) to bytes, there are 1.6 x 10^11 bytes of disk space in the computer lab.
If there are 8 computers in the computer lab that each have 20 GB hard drives, then multiplying 8 by 20 will give the total disk space in GB.
total disk space = 8 x 20GB
total disk space = = 160GB
Conversion is the process of changing the value of one form or unit to another. It can be changing ones unit of length, weight, volume or even currency to another.
A conversion factor is a number used to change one set of units to another, either by multiplying or dividing.
If 1 gigabyte (GB) is equal to 1 x 10^9 bytes, then multiply 1 x 10^9 to the total disk space,
total disk space = 160GB
1 gigabyte (GB) = 1 x 10^9 bytes
total disk space = 160(1 x 10^9) bytes
total disk space = 1.6 x 10^11 bytes
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Identified triads of elements with similar properties: organized elements according to increasing atomic mass:
Triads of elements with similar properties are : Strontium, Calcium, and Barium.
Dobereiner organized elements according to atomic mass.
He organized them by adding of first and third number of element's atomic mass and their average would be nearly the same as the atomic mass of the second one.
Triads are known as the three elements group, which were are given by the scientists to understand the concept of the arrangement of the elements better on the basis of their masses.
On the basis of this triad, Dobereiner introduced three triads. He added the atomic mass of first and third element and their average would be same or nearly the same as the atomic mass of the second one.
It is helpful to understand the numbering of elements better. But this system has some major drawbacks due to which, it is not followed by anyone today.
This makes modern periodic table a good option to understand about the elements better.
Therefore, the three triads of Dobereiner which were introduced by him are Strontium, Calcium, and Barium.
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How can properties of matter be used to classify matter
The properties of matter which can be used to classify it include the following:
Physical properties such as shape, density etc.Chemical properties such as reactivity.What is Matter?This is referred to as any substance which has mass and occupies space thereby meaning that it has a volume.
Matter can be classified into three forms which are:
SolidLiquidGasMatter has physical properties such as shape in which a solid has a definite shape while gas and liquid doesn't due to the distance of their molecules. On the other hand chemical properties such as reactivity also determines the classification as gas is known to be more reactive while solids are least reactive.
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1. Explain why the lattice disassociation enthalpy of magnesium chloride is greater than that of calcium chloride
2. Explain why the lattice disassociation enthalpy of magnesium oxide is greater than that of magnesium chloride
The difference in lattice energies between MgCl2 and CaCl2 is 269 kJ.
2. lattice disassociation enthalpy of magnesium oxide is greater than that of magnesium chloride.
because magnesium chloride consist of 3 ions in total , whereas magnesium oxide has 2 ions and oxide ions are smaller than chloride ions, Which means that the ions are closer together in the lattice of magnesium oxide than magnesium chloride , and which also increases the strength of the attractions.
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Use the information from the article to answer the question. why is pluto now called a dwarf planet?
Answer:
coz it doesn't meet the three criteria the iau uses to define a full sized planet
Explanation:
it meet all other except one :has no cleared its neighboring region of other object
Drag each tile to the correct location.
What types of mixtures are these? Homogeneous or Heterogeneous
- peanuts and almonds mixed
together in a bowl
- a bucket full of sand and gravel
- a cup of tea and sugar
- food coloring dissolved in water
Answer:
below
Explanation:
- peanuts and almonds mixed
together in a bowl heterogeneous
- a bucket full of sand and gravel
heterogeneous
- a cup of tea and sugar homogeneous
- food coloring dissolved in water homogeneous
a biologist is observing an organism under a microscope and concludes that it is a unicellular organism. what evidence that this organism must be unicellular, not multicellular?
Answer:
The organism is unicelluar
Explanation:
The organism is unicelluar because we weren't told The type of Microscope the biologist made Use of .
what is the naming for TiO?
Answer:
Titanium oxide.
Explanation:
Have no idea what the awnser is for this one right here
Answer:
A because its A
Answer:
A is 5.67 x 10x10x10 B is 0.567 x 10x10x10x10
which scientist came up with the first widely recognized atomic theory? j.j. thomson j.j. thomson john dalton john dalton antoine lavoisier antoine lavoisier robert millikan
The scientist who came up with the first widely recognized atomic theory is John Dalton.
What is Dalton's atomic theory?The first thorough effort to categorize all matter in terms of atoms and their characteristics was Dalton's atomic theory.
Dalton based his hypothesis on the laws of mass conservation and constant composition. It has the following aspects:
The matter is made up of irreducible atoms, according to the first component of his theory.The second aspect of the theory states that the mass and properties of every atom in a particular element are the same.Compounds are combinations of two or more different sorts of atoms, according to the third section.The theory's fourth section claims that a chemical reaction is an atom's rearrangement.To learn more about Dalton's atomic theory, visit the link:
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____ is an example of a substance that is not soluble.
(I have to fill in the blank.)
Answer:
Substance
Explanation:
Substances that do not readily dissolve in water can be described as hydrophobic substances. Hydrophobic substances are those which when exposed.
what technological advancement was required for rutherford to conduct his experiment ?
Rutherford conducted a famous experiment called the gold foil experiment.
He took a skinny sheet of gold foil. He used a special gadget to shoot alpha particles undoubtedly charged debris on the gold foil. most debris passed straight thru the foil like the foil was now not there. They bombarded very skinny sheets of gold foil with fast-shifting alpha debris. Rutherford found that a small percent of alpha debris had been deflected at massive angles, which could be explained by using an atom with a very small, dense, definitely-charged nucleus at its middle.
Rutherford designed an experiment to apply the alpha particles emitted via a radioactive element as probes to the unseen global atomic structure. If Thomson changed into correct, the beam might move immediately through the gold foil. most of the beams went via the foil, however, some have been deflected. Ernest Rutherford postulated the nuclear structure of the atom, determined alpha and beta rays, and proposed legal guidelines for radioactive decay. In 1911, Rutherford, Marsden, and Geiger determined the dense atomic nucleus by bombarding a thin gold sheet with the alpha particles emitted through radium.
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What are the two anions used in this lab to perform selective precipitation of the
unknowns?
chloride and chromate ions
sulfide and carbonate ions
sulfide and ammonium ions
o chloride and sulfide ions
Answer: Chloride and Chromate ions
Explanation:
Two anions used in this lab to perform selective precipitation of the unknowns are chloride and chromate ions.
Anions such as Cl− , Br− , SO2−4 , CO2−3 , S2− , Cr2O2−4 , PO2−4 , OH− etc., forms a mixture of metal ions in a solution which can be separated by precipitation. If a metal ion or a group of metal ions forms insoluble salts with a particular anion, then they can be separated from others by the precipitation.
Anions can also be separated by the precipitation with appropriate metal ions. There are no separation lines between insoluble salts, sparingly soluble, and soluble salts, but their concentrations of saturated solutions are small, medium, and large. For insoluble and sparingly soluble salts, solubility products are usually listed. But for soluble salts they are not given.
Solubility products for soluble salts are very large.
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glucose molecules bond together in a process known as dehydration synthesis. what happens in this process? (4 points) water is used as a reactant in order to build the polysaccharide molecule. a water molecule is formed from the hydrogen and oxygen atoms removed. the reaction uses water molecules to break the bonds in each glucose. water molecules are removed from each glucose molecule by the addition of heat.
Glucose molecules bond together in a process known as dehydration synthesis. In this process, a water molecule is formed from the hydrogen and oxygen atoms removed.
The process of chemical reaction in which water is lost is named as dehydration process. During the process of formation of the larger molecules from the smaller monomers, a water molecule is released. It is the dehydration synthesis.
The glucose monomers are bonded together and with each bond, in the synthesis process. The water molecule is lost in this process. Polymers are formed, such as starch, and cellulose, from the monomers of glucose.
Polymers such as DNA, proteins, and carbohydrate, are formed through the process of dehydration synthesis.
Therefore, the correct point explaining the process of dehydration synthesis is that a water molecule is formed from the hydrogen and oxygen atoms removed.
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Sodium phosphate reacts with sulfuric acid to form sodium sulfate and phosphoric acid. What is the stoichiometric coefficient for sulfuric acid when the chemical equation is balanced using the lowest whole-number stoichiometric coefficients?.
When sodium phosphate reacts with sulfuric acid, forming sodium sulfate and phosphoric acid, the stoichiometric coefficient for sulfuric acid in the balanced chemical equation is 3.
In every balanced chemical equation, the total number of individual atoms on the reactant side must be equal to the total number of individual atoms on the product side. The stoichiometric coefficient is the number written in front of each reactants and products that tells how many moles of each are needed in the reaction.
The chemical equation for the given reaction is:
[tex]Na_{3} PO_{4}[/tex] + [tex]H_{2} SO_{4}[/tex] = [tex]Na_{2} SO_{4}[/tex] + [tex]H_{3} PO_{4}[/tex]
Put the necessary stoichiometric coefficient to balance each element.
Balancing Na:
[tex]2Na_{3} PO_{4}[/tex] + [tex]H_{2} SO_{4}[/tex] = [tex]3Na_{2} SO_{4}[/tex] + [tex]H_{3} PO_{4}[/tex]
Balancing P:
[tex]2Na_{3} PO_{4}[/tex] + [tex]H_{2} SO_{4}[/tex] = [tex]3Na_{2} SO_{4}[/tex] + [tex]2H_{3} PO_{4}[/tex]
Balancing S:
[tex]2Na_{3} PO_{4}[/tex] + [tex]3H_{2} SO_{4}[/tex] = [tex]3Na_{2} SO_{4}[/tex] + [tex]2H_{3} PO_{4}[/tex]
Notice that H and O are already balanced.
Hence, the balanced chemical equation for the reaction is:
[tex]2Na_{3} PO_{4}[/tex] + [tex]3H_{2} SO_{4}[/tex] = [tex]3Na_{2} SO_{4}[/tex] + [tex]2H_{3} PO_{4}[/tex]
where 3 is the stoichiometric coefficient of sulfuric acid, [tex]H_{2} SO_{4}[/tex].
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given that a mineral has three planes of cleavage, one of which is inclined, and breaks into rhombs, is the mineral mica, pyroxene, amphibole, halite, or calcite?
Answer:
Calcite
Explanation:
how are the atoms of different elements similar?
Answer:
Sort of
Explanation:
Each element is unique (forget isotopes for a while), and so, you would expect them to each have unique properties, and you would be right. They each have their properties that belongs to them alone.
But chemists soon found out that some of them even though unique actually share some similarities, like some of them reacting the same way with another given element in very specific proportions, or that some of them had tendencies that other elements didn´t have.
This realization led to creating a table where every atom in a same column had these similar properties, and, by organizing them in order of atomic weight, they found out many other properties that certain regions had. They also noticed that this arrangement led to properties changing quite consistently when you traveled from a point to the other of the table.
This was such a huge huge discovery that, even before we had the heavy duty machinery to identify atoms, and some of them were still to be found, chemists could pinpoint that we still had some to find because, when organizing them, we realized that there were holes, that would be later be filled by an yet undiscovered element.
Also, this table is so powerful that we are 100% sure that we won´t find any more elements before the smallest nor in between the ones already discovered, at most, we can find bigger elements in some crazy star that has super duper harsh conditions that may stabilize bigger ones. I think there are some questions in Quora where physicists (wizard people) discuss this possibility
The number of neutrons in atoms of different elements can be the same
Calculate the frequency of yellow light with a wavelength of 580 x 10–9 m.
Answer:
5791
Explanation:
Easy peasy lemon squeazy
Wood tends to be hard and relatively inflexible, especially when it's been dried. This is why wood is an excellent building material.
Answer:
Explanation:
Physical Property
Explanation:
Hardness is the physical property
What is the correct balanced formula for combining Beryllium and Nitrogen? 1 p
the numbers in the answer choices represent subscripts
OBEN
O Be2N
Be3N1
Be3N2
Answer:
Be3N2
Explanation:
The valancy of beryllium is 2 and Nitrogen is 3 and from criss-cross method
Be. N. ( name of elements)
2. 3. ( their valancy)
Enter a balanced chemical equation for the reaction of solid rubidium with liquid water.
The balanced chemical equation of solid rubidium with liquid water is
2Rb + H₂O --------> 2RbOH + H₂
Rubidium is an alkali metal reacts rapidly with water to form a colourless solution of rubidium hydroxide (RbOH) and hydrogen gas.
The reaction is so fast that if reaction takes place in a glass container it will shatter the container.
Balancing a chemical equation is involves the stoichiometric coefficient to the reactants side and products side.
Rb + H₂O -------> RbOH + H₂
NOW, Reactants and Products
Rb 1 1
H 2 3
O 2 2
Multiply 2 with Rb , H₂O and RbOH
2RbOH + 2H₂O --------> 2RbOH + H₂
Reactants and Products
Rb 2 2
H 4 4
O 2 2
The equation is now balanced.
The balanced chemical equation of solid rubidium with liquid water is
2Rb + H₂O --------> 2RbOH + H₂
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Which statement best describes force? (1 point)
Force is a vector quantity that measures both direction and magnitude of a push or pull on an
object.
Force is a vector quantity that measures both momentum and magnitude of a push or pull on an
object.
Force is a vector quality that measures both direction and magnitude of a push or pull on an
object.
Force is a scalar quantity that measures both direction and magnitude of a push or pull on an
object.
Answer:
Force Is a Vector Quantity that measures both direction and magnitude of a push or pull on an object.
Explanation:
The formula for Force= Mass × Acceleration. And when applying force, there is a direction at which the body is focused on. Hope this helps
Answer:
(Question 1) Which statement best describes force?
(Answer) Force is a vector quantity that measures both direction and magnitude of a push or pull on an object.
(Question 2) A soccer ball is traveling downfield with a force of 1.2 kN and strikes another soccer ball that is stationary. Which of the following describes the result of the collision?
(Answer) The stationary soccer ball will begin moving downfield and the ball that struck it will slow down.
(Question 3) Which of the following scenarios accurately describes magnitude and direction?
(Answer) A car traveling northward with 5 kN of force could be brought to a stop by a southward force of 5 kN.
(Question 4) What is force directly proportional to?
(Answer) the acceleration and mass of an object
(Question 5) Two ropes are being used to suspend a box. Each rope is exerting 5 N of upward force. If the forces are balanced and the box is stationary, how much force is being exerted by the box itself and in which direction?
(Answer) The box exerts 10 N of force downward.
Explanation:
just did the Quick Check UwU Enjoy
which best compares the particles of the substance when it is in region 1 with the particles of the substance when it is in region 3? the particles are slower in region 3.
The correct statement is the particles are more orderly in region 1, which is the solid state. The other statements are false.
Since, the region 1 is solid state, region 2 is liquid state and the region 3 is gaseous state, particles are more orderly in region 1.
In solid, the particles are closely packed together. They are not free to move within a substance. The particles in solid are in a regular pattern or arrangement making the particles of substance more orderly.
In liquid, particles are close together but they are not in a regular arrangement or pattern, and in gases, the particles of substance are well separated, i.e. not closely packed with no regular arrangement.
So, particles are more orderly in region 1.
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Correct question is :
Which best compares the particles of the substance when it is in region 1 with the particles of the substance when it is in region 3? The particles are slower in region 3. The particles are more orderly in region 1. The particles have more kinetic energy in region 1. The particles have less freedom of motion in region 3.
.115km=_______cm
Please I need help!
Explanation need I know the answer!
Answer:
115km is equal to 11500000cm
Explanation:
If I were to designate circles as orbital, which would be a correct arrangement for 2p sublevel with only 3 electrons.
Answer:
Option 3
Explanation:
Because electrons have the same charge, they repel. So, if possible, the electrons should be in different orbitals.
How would the following atoms bond? Match items from left to the right. Please help!! Actual answers only!!
The correct pairing of the elements based on the nature of chemical bonds formed is:
Na + F = NaFCa + O = CaOB + N = BNWhat are chemical bonds?Chemical bonds are bond which are formed between atoms of the same element or different elements by a transfer of a sharing of electrons.
There are two main types of chemical bonds:
Ionic or electrovalent bonds, andCovalent bondsIonic bonds results in the formation of oppositely-charged ions as electrons are transferred from one atom to another.
Example of ionic bonds are the chemical bonds formed between sodium and fluorine to form sodium fluoride, and the chemical bond formed between calcium and oxygen to form calcium oxide.
Covalent bonds are formed when atoms of the same or different elements share electrons between them.
Examples of covalent bonds are the chemical bonds formed between Boron and Nitrogen to form boron nitride.
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Calculate the maximum wavelength of light capable of dissociating the cl–f bond in one molecule of chlorine monofluoride if the bond energy, or bond dissociation energy, is 251 kj/mol.
According to bond energy, the maximum wavelength of light is 475 nanometers.
We need to know about bond energy to solve this problem. Bond energy is the energy needed to bond other atoms in the molecule. To determine the energy in one molecule of chlorine monofluoride, we can use this formula:
E = BE / Na
where E is the energy of photon, BE is bond energy and Na is Avogadro's number (6.02 x 10²³ atoms/mol)
Now, we can calculate the shortest wavelength by using Einstein's equation for photon energy:
E = h . c / λ
where h is Planck constant (6.6 x 10¯³⁴ J.s), c is the speed of light (3 x 10⁸ m/s) and λ is the wavelength.
From the question above, we know that
BE = 251 kJ/mol = 251 x 10³ J/mol
By substituting the given parameters, we can calculate the maximum wavelength
E = BE / Na
h . c / λ = 251 x 10³ / 6.02 x 10²³
6.6 x 10¯³⁴ . 3 x 10⁸ / λ = 251 x 10³ / 6.02 x 10²³
λ = 4.75 x 10¯⁷ m
λ = 475 nm
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