Eutectic point is used to describe the lowest temperature at which a mixture of any amount of two compounds will melt.
The eutectic factor is the bottom temperature at which the liquid section is solid at a given pressure. A eutectic system is a homogenous, stable aggregate of or extra materials that shape a super-lattice that melts or solidifies at a temperature decrease than any of the person ingredients' melting factor. When combining elements, one extraordinarily not unusualplace factor is known as the eutectic factor. The eutectic factor has some neat houses however the critical component is that it has a low melting factor.
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A 5.25 g sample of metal at 49.5 °C
gives off 10.4 J of energy until it is at
40.5 °C. What is the specific heat
of the metal?
J
c = [?] g ºc
note: q = -10.4 J
Spec. Heat (J/g °C)
The specific heat of the metal is 0.220106 (J/g °C).
What is the specific heat of the metal? The specific heat of a metal is a measure of how much energy is required to raise the temperature of one gram of the metal by one degree Celsius. It is typically expressed in units of joules per gram-degree Celsius (J/g°C). The specific heat of a metal is determined by its atomic structure and its chemical composition. Different metals have different specific heats, and the range of values can vary greatly. Generally, metals with a higher atomic weight have higher specific heats than those with a lower atomic weight. For example, gold has a specific heat of 0.13 J/g°C, while aluminum has a specific heat of 0.90 J/g°C. Heat capacity, which is a measure of the amount of heat energy required to raise the temperature of a material, is related to specific heat. Generally, the higher the specific heat of a material, the higher its heat capacity.Solution:
This can be calculated using the equation q = mc∆T, where q is the energy given off, m is the mass of the metal (5.25 g), c is the specific heat of the metal, and ∆T is the change in temperature (40.5 °C - 49.5 °C = -9 °C).
Thus, c = -10.4 J / (5.25 g * -9 °C), which can be simplified to 0.220106 (J/g °C).
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Which of the following is NOT an example of how biotic factors interact with abiotic factors in an ecosystem?
A lion preys on a herd of gazelle.
⊝
Plants remove carbon dioxide from the air and add oxygen.
⊝
Animals cause erosion by digging in the dirt.
⊝
A lizard raises its body temperature by using heat from the Sun.
⊝
CLEAR ALL
Answer:
A lion preys on a herd of gazelle.
Explanation:
lions and gazelles are both biotic factors since they are living organisms.
Johnny had a balloon filled with 0.222 moles of hydrogen gas. When his lab partner Marisa lit the balloon with a candle on the end of a long stick it burst into a fireball making water. Johnny and Marisa realized that the hydrogen in the balloon reacted with the oxygen in the air to make water according to the equation:
2H2 + O2 --> 2H2O
Their teacher asked them to find out how many moles of oxygen were burned and how many moles of water were formed.
To solve this we must be knowing each and every concept related to moles. Therefore, 0.11moles of oxygen were burned and 0.222 moles of water were formed.
What is mole?A mole is merely a measuring unit. In reality, it is among the International System on Units' seven foundation units (SI). When basically determines are insufficient, new units are created.
Chemical reactions frequently occur at levels that use grams would be inappropriate, but using actual figures of atoms/molecules/ions would also be misleading. As a result, scientists devised the mole for bridge the divide between extremely small and extremely huge numbers.
2H[tex]_2[/tex] + O[tex]_2[/tex] [tex]\rightarrow[/tex] 2H[tex]_2[/tex]O
The mole ratio between hydrogen gas and oxygen gas is 2:1
moles of hydrogen gas = 0.222 moles
moles of oxygen gas =0.11moles
moles of water formed = 0.222 moles
Therefore, 0.11moles of oxygen were burned and 0.222 moles of water were formed.
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What is the volume of 1.00 mole of a gas?
The volume of 1.00 mole of a gas is 22.4 x 10⁻²m³.
Volume is the measure of a three-dimensional space. It is often quantified numerically using the SI derived units (such as the cubic metre and litre). The volume of a container is generally understood to be the capacity of the container; i.e., the amount of a fluid (liquid or gas) that the container could hold, rather than the amount of a space the container itself displaces.
The volume of 1 mole of a gas
PV = nRT
V = RT / P = 0.082 X 273 (as p = 1)
V = 22.386 = 22.4 L
= 22.4 ₓ 10⁻³m³
22.4 ˣ 10⁻²m³
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How is a balanced chemical equation similar to a recipe? Explain
Explanation:
A balanced chemical equation is very similar to a recipe. Clicking on the s'more on the left will show you more of the similarities between cooking and stoichiometry. A balanced chemical equation gives you the ingredients (reactants) and the final food (products).
What intermolecular forces can HCI interact with other like molecules through
Only dispersion and Dipole
Only dispersion
Dispersion, dipole, and hydrogen bonding
Answer:
Intramolecular forces are the forces that hold atoms together within a molecule.
Explanation:
Intermolecular forces are forces that exist between molecules.
during which phase do chromosome first become visible?
During Prophase chromosome first become visible . Prophase is the first phase of mitosis .
The process of mitosis, which divides the duplicate genetic information held in a parent cell's nucleus into two identical daughter cells, begins with the prophase. The chromatin, or DNA and protein complex, that makes up the nucleus condenses during prophase. As they super coil during prophase, the chromosomes become discernible under a light microscope. Spindle microtubules expand and reach from each pole to the equator while the nuclear envelope disintegrates.
Prophase is the time when the nucleoli vanish and the chromatin fibres thicken and shorten to produce distinct chromosomes that can be seen under a light microscope. Each replicated chromosome appears as two chromatids linked at the centromere that are identical to one another. The visible chromosomes are created as the chromatin coils and gets smaller and smaller.
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Calculate the frequency of the light emitted by a hydrogen atom during a transition of its electron from the n = 4 to the n = 1 principal energy level. Recall that for hydrogen En = –2.18 × 10–18 J(1/n2).
The frequency of the light emitted by a hydrogen atom during a transition from n = 4 to n = 1 is given by the equation:
(E4 - E1) / h = ( -2.18 x 10^-18 J(1/4^2) - (-2.18 x 10^-18 J(1/1^2)) ) / h = 3.4 x 10^14 Hz
What is the relationship between the energy difference and the frequency of light emitted during a transition in a hydrogen atom?The energy difference between two energy levels in a hydrogen atom is directly proportional to the frequency of light that is emitted during a transition between those levels. According to the equation E = hf, where E is the energy difference, h is Planck's constant, and f is the frequency of light, as the energy difference increases, the frequency of light emitted also increases. In other words, when an electron in a hydrogen atom jumps from a higher energy level to a lower energy level, it releases energy in the form of light, and the frequency of that light is determined by the energy difference between the two levels.
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use the bond dissociation energies of H2 and of a typical carbon-carbon bond to___.
Use the bond dissociation energies of H2 and of a typical carbon-carbon bond to determine the stronger bond.
The energy required for one mole of a divalent molecule to dissociate into individual atoms, often in the gaseous state, is known as bond dissociation. Because carbon monoxide has 10 electrons in its outermost shell, resulting in six shared electrons in 3 bonding orbitals, the carbon and oxygen in carbon monoxide form a triple bond as opposed to the double bond created by other carbon compounds. The remaining two electrons are from oxygen, whereas the other two are from carbon. As a result, when two oxygen electrons are located in the same orbital, a dative bond will be created.
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What is oxidation and reduction in terms of electrons explain Giving one example?
The oxidation and reduction in terms of electrons is the gain of the electrons is called as the reduction and the loss of the electrons is called as the reduction.
The oxidation is defined as is the loss of the electrons or the increase in the oxidation number. The reduction is defined as the gain of the electrons or the decrease in the oxidation number. The example is given as :
Cu²⁺ + Zn ----> Zn²⁺ + Cu
This is reaction the copper undergoes the oxidation as oxidation number increases. The zinc undergoes the reduction as the oxidation number decreases. This reaction oxidation - reduction reaction is redox reaction.
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Can Na and O form an ionic compound?
Yes, sodium (Na) and oxygen (O) can form an ionic compound. When they react, sodium will lose an electron to become a positive ion (Na+) and oxygen will gain an electron to become a negative ion (O2-).
The ionic compound sodium oxide (Na2O). Sodium oxide is a white crystalline solid that is formed by heating sodium metal in the presence of oxygen. It is a basic oxide, meaning that it reacts with water to form a base (sodium hydroxide, NaOH) and it is also called "soda ash". It has a wide range of industrial uses including glass production, soap making and paper production. It is important to note that in nature, Sodium (Na) and Oxygen (O) are not likely to react with each other in their pure form, as sodium is a highly reactive metal that reacts with water and oxygen in the air, and oxygen is a gas. But in industrial and laboratory settings, where conditions can be controlled, it is possible to react them to form an ionic compound like Na2O.
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Describe the structure and makeup of DNA.
Answer:
The explanation is where the answer is. You may copy word for word if you need to.
Explanation:
DNA is 2 linked strands that twist around each other. Imagine scwiggle lines intertwining with each other but seperated with an horitonzal line. The shape is also known as a double helix. Each strand as something called the backbone. The backbone is made of alternating sugar (deoxyribose) is the scientific word for it, and the backbone is also made of phosphate groups. The backbone is attached to 4 diffrent figures. The are represented with letters. (A) = Adenine. (C) = Cytosine. (G) = Guanine. Or (T) Thymine (T).
the saturated shown above is left uncovered on a lab bench at a constant temperature. as the solution evaporates, samples of the solution are removed every three days and the in the samples is measured. it is observed that the in the solution did not change over time. which of the following best helps to explain the observation? (a) as the solution evaporates, and leave the beaker along with the water molecules. (b) as the solution evaporates, the dissolution of in the beaker decreases. (c) the evaporation of water is endothermic, so more dissolves exothermically in the solution, which increases the . (d) as water evaporates, more precipitates out of the solution in the beaker.
Answer: option D
Explanation:
Can anyone please help me with this question? Thanks :D
A chemist runs the following reaction in a closed vessel:
2C2H6 + 7O2 4CO2 + 6H2O
After it is complete, she collects 10.0 grams of CO2, 6.1 g of H2O, and 5.0 grams of O2. What was the limiting reactant?
The Combustion is the the limiting reactant.
What is combustion ?
The generation of heat and light in the form of flame together with a chemical reaction that often entails the presence of oxygen. When a substance interacts with oxygen, a chemical reaction known as combustion occurs that generates heat. Among them are ethane, wood, and propane. The word for these compounds is exhaust. The majority of the exhaust is produced by chemical processes involving fuel and oxygen.
What is reaction ?
In a chemical reaction, one or more chemicals change into one or more other substances. For instance, the reaction between iron and oxygen results in rust. Sodium acetate, carbon dioxide, and water are the end products of the reaction between vinegar and baking soda.
Therefore, the Combustion is the the limiting reactant.
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A buffer solution contains ethanoic acid and its conjugate base; the pKa of ethanoic acid is 4.74. At what pH does the solution buffer?
a) 3.0
b) 4.0
c) 5.0
d) 6.0
At pH c) 5.0 the solution is buffer. A buffer solution contains ethanoic acid and its conjugate base; the pKa of ethanoic acid is 4.74.
A buffer solution will work between +/- 1 unit of pH around its pKa value of weak acid. A buffer solution is most effective for both for acid addition and base addition when the pH near to pKa value of weak acid. It is far essential to have answers whose pH does now no longer alternate even at the addition of sturdy alkalis or sturdy acids. Such solutions are known as buffer solution. Buffer capability is the capability of a buffer technique to withstand alternate in its pH. The equation is given by, pH = pKa + log [Salt] / [Acid]
Thus, the pH of the buffer solution is c) 5.0.
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How CH4 is formed formula?
CH4 is formed by four hydrogen atoms bonded with a single carbon atom by single bond.
CH4 named as Methane in IUPAC nomenclature. Methane is a chemical emulsion having the chemical formula CH4. It's a colourless, odorless and non-toxic ignitable gas. It's slightly answerable in H2O. The boiling point of methane is −162 °C and the melting point is−182.5 °C. The hybridization of CH4 is sp3.And the bond length of four carbon hydrogen in methane is 109 pm and the bond strength is 429kJmol- 1.Methane can be prepared by protonation of CH3Li or a methyl Grignard reagent such as CH3MgCl. And can be made from anhydrous C2H3NaO2 and dry NaOH, mixed and heated above 300 °C (with Na2CO3 as byproduct).
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10)1. how many moles are represented by 150 grams of each of the following compounds: a. calcium phosphate ca3(po4)2 b. alum al2(so4)3 c. lime caco3 d. soda ash na2co3 e. nitric acid hno3
To determine the number of moles represented by 150 grams of each of the following compounds, we need to use the formula of the compound and the molar mass.
a. Calcium Phosphate (Ca3(PO4)2): 150g / (310.17 g/mol) = 0.48 moles
b. Alum (Al2(SO4)3): 150g / (342.15 g/mol) = 0.437 moles
c. Lime (CaCO3): 150g / (100.09 g/mol) = 1.498 moles
d. Soda Ash (Na2CO3): 150g / (106.00 g/mol) = 1.416 moles
e. Nitric Acid (HNO3): 150g / (63.01 g/mol) = 2.380 moles
It's important to note that these calculations are based on the assumption that the compounds are in pure form. In real-world applications, impurities or water content can affect the mass and molarity.
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How many carbon atoms are there in 1 mole of C2H4?
The molecular formula for ethylene is C2H4, and it contains two carbon atoms and four hydrogen atoms.
A compound is anything created when two or more separate chemical elements are mixed together in a specific proportion.
Chemical connections that are challenging to break are created when the elements interact with one another. These bonds develop as a result of atoms sharing or trading electrons.
Salts and molecular compounds are the two categories into which compounds can be divided. Covalent bonds hold the atoms together in molecular molecules. Ionic bonds hold it together in salts. Every compound is composed of one of these two types of bonds.
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When two solutions have the same concentration of solute what are they called?
When two solutions have the same concentration of solute what are they called isotonic solution.
An isotonic solution possesses the same osmolarity, meaning solute concentration, as another solution. Water would stream in equal parts out of one solution as well as into the other if all these two solutions were connected by a semipermeable membrane.
Hypotonic fluid has less fluid, carbohydrates, as well as salt than blood. Hypertonic fluid contains more fluid, carbohydrates, and salt even than blood. Isotonic fluid, carbohydrates, and salt concentrations are similar to those found in the blood.
If the concentrations of both the internal and external solutions were the same, the two solutions are classified as isotonic.
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Is carbon dioxide ionic or covalent?
Answer: Covalent bonds
Explanation:covalent bonds are bonds between nonmetals. C is a non metal as well as O.
Which of the following are the structural polysaccharides? (a) Glycogen (b) Starch (c) Chitin (d) Glucose
Answer: chitin
Explanation:
your mom :)
hydrogen cyanide gas can be made by a two step process. first, ammonia is reacted with oxygen gas to give nitrogen monoxide and water vapor. in the next step, nitrogen monoxide is reacted with methane (ch4) to give hydrogen cyanide gas. the by-products in the second step are water and hydrogen gas. when 22.1 g of ammonia and 28.6 g of methane are used, how many grams of hydrogen cyanide can be produced?
There will be 35.1 grams of hydrogen cyanide can be produced
For the first reaction, our reactants are:
NH₃ andO
Products include H₂O and NO
For the second reaction, our reactants are:
CH₄ and NO
The products are:H₂, H₂O and HCN.
The reaction are
4NH₃ and 5O₂ → 6H₂O + 4NO
2NO and 2CH₄ → 2HCN + H₂ + 2H₂O
4 moles of ammonia can make 4 moles of NO in the first stage, hence the ratio is 1:1.
22.1 g . 1mol / 17 g = 1.3 moles of ammonia
1.3 moles of NO have been created
28.6 g . 1 mol / 16 g = 1.7875 moles of methane.
2:2 is the ratio. We therefore need 1.7875 moles of NO for every 1.7875 moles of methane.
Moles are identical. This is the limiting reactant since there is not enough NO.
The product ratio is also 2:2.
1.3 moles of HCN were created from 1.3 moles of NO.
By converting moles to mass, we get 1.3 mol. 27 g/mol = 35.1 g
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What is the uneven distribution of charge on a water molecule called ?
Answer:
polar molecule
Explanation:
Answer:
Polar molecule
Explanation:
It is called a polar molecule which results in the uneven distribution of charge.
Water is polar because the electronegativities of oxygen and hydrogen are different.
Electronegativity is the ability of an atom to attract a bonding pair of electrons in a covalent bond. As the number of protons in the nucleus increases, the electronegativity or attraction increases. Oxygen has 8 protons, while hydrogen has 1 proton, hence oxygen is more electronegative than hydrogen.
This gives oxygen a slightly negative charge, which pulls the hydrogen electrons towards the oxygen. Hydrogen has a slightly positive charge as it has a lower electronegativity value, so is less able to attract the electrons from oxygen.
This uneven distribution of charges brings about polarity in water.
A large difference in electronegativity makes a compound polar, which you can also tell from using a Pauling scale (a measure of electronegativity).
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in the early 1960s, radioactive strontium-90 was released during atmospheric testing of nuclear weapons and got into the bones of people alive at the time. if the half-life of strontium-90 is 28 years, what fraction of the strontium-90 absorbed in 1964 remained in people's bones in 1999?
The fraction of strontium-90 that remained in people's bones in 1999 would be 0.25, or one quarter. This is calculated by raising 0.5 (the decay constant of strontium-90) to the power of (1999 - 1964) / 28 (the half-life of strontium-90).
The decay of a radioactive element is a logarithmic process, meaning that an exponentially decreasing amount of the element remains after each half-life. In the case of strontium-90, the amount of the element remaining in the bones of people alive in 1964 would decrease by half after 28 years.
In 1999, 35 years after 1964, this means that only one quarter (0.25) of the original amount of strontium-90 would remain in people's bones.
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Substances that are formed as a result of a chemical reaction are called -------- and are written on the ---------- side of the equation.A.productsB.Right hand Side
Substances that are formed as a result of a chemical reaction are called products and are written on the right side of the equation.
A chemical reaction is the transformation of one or more chemicals, known as reactants, into one or more new compounds, known as products.
When atoms' chemical bonds are established or ruptured, chemical processes take place. The materials that initiate a chemical reaction are known as reactants, while the materials created as a result of the reaction are known as products.
Within the body's cells, the majority of chemical processes occur. The fundamental building blocks of multicellular creatures and all life are cells. Enzymes aid in the majority of chemical reactions that take place inside of our body's cells.
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the weight of an alloy is 45.6 g. the alloy includes 3.1 g of carbon. determine the percentage (by mass) of carbon in this alloy.
Metallic bonding is a known characteristic of alloys. The components of an alloy are measured in terms of their mass percentage for practically all practical uses. The components of alloys are, however, quantified in terms of their atomic fractions for specific scientific research.
What are the parameters of calculating weight of an alloy?Unfortunately, a two metal alloy is the only one that can be used to determine an alloy's weight fractions from the alloy's density.
We must first utilize the following equation: where x is the weight percentage of metal A and the rhos are the corresponding densities. Solving for x is all that is required.
Therefore, To determine the weight of alloys in a variety of shapes, such as round bars, hexagonal sheets, flat bars, and tubes, use our weight calculator.
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_NaCl +_Pb(NO3)2 → _NaNO3 +
_PbCl₂
How many grams of lead (II) chloride can be collected
from 34.5 g sodium chloride and an excess amount of
lead (II) nitrate?
a) 32.1 g (yellow)
b) 56.8 g (light blue)
c) 82.1 g (pink)
d) 76.3 g (gray)
81.9g of lead (II) chloride can be collected from 34.5 g sodium chloride and an excess amount of lead (II) nitrate
What is a balanced reaction?
An equation for a chemical reaction is said to be balanced if both the reactants and the products have the same number of atoms and total charge for each component of the reaction. In other words, both sides of the reaction have equal amounts of mass and charge.
The balanced chemical equation is as follows :
2NaCl + Pb(NO3)2 =>PbCl2 + 2NaNO3
2 moles of NaCl = 117g
1 mole of Pb(NO3)2 = 331g
1 mole of PbCl2= 278g
117g of NaCl reacts with 331g of Pb(NO3)2
Therefore, 34.5g will be 331×34.5/117
= 97.60g of Pb(NO3)2
Pb(NO3)2 is in excess
So, NaCl is the limiting reactant.
Now,
117g of NaCl produced 278g of PbCl2
Therefore, 34.5g will be 34.5×278/117
=81.9g of PbCl2
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How many carbon atoms are in a mole of methane?
Methane has 6.02x10²³ carbon atoms per mole.
A mole is the volume of a substance that includes 6.022 x 10²³ of its constituent parts, such as particles, atoms, ions, molecules, etc.
A mole is a unit for counting molecules, ions, or atoms.
The following formula can be used to determine how many moles of a material are present in a specific pure sample:
n = N÷NA
Where,
The number of moles is n.
The sample's total number of elementary entities is N.
Avogadro's number is NA.
Avogadro's number, or 6.022 ×10²³ elementary entities of the given substance, is equivalent to one mole of a substance.
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Which pair of elements can combine to form ionic bonds? a. H and CIa
b. H and N
c. S and Sr
d. Xe and F
a process in which two atoms collide and their nuclei merge, forming a new atom and releasing energy.
A process in which the two atoms collide and their nuclei merge and formed a new atom and releases the energy called nuclear fusion reaction.
The nuclear fusion is the process when the two or more atoms collide with each other and their nuclei fuse to form single nucleus and releases the large amount of energy. The nuclear fusion produce more energy as compared to the nuclear fission. It requires the high temperature and pressure. Nuclear fusion produces large amount of energy.
Nuclear fusion require the large amount of heat energy for the process to occur. The nuclear fission does not require large amount of energy.
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