Exothermic processes are those in which heat is evacuated from a substance, as in freezing or condensation.
The correct answer is D
what are the exothermic and endothermic types?Endothermic chemical reactions are those in which all reactants take in heat that the environment provides to create products. An fast pyrolysis is one in which heat or light are released as forms of energy. Energy from the environment is taken up by the reaction.
What does exothermic imply in everyday language?An exothermic process in chemistry involves the release off heat. Since heat is released during candle burning, the process is exothermic. Exothermic is a useful scientific adjective to use when describing reactions that release energy, typically in the form of heat.
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How are rocks most often classified?
A
by their age
B
by their mass
C
by their location
D
by their formation
Answer: the answer is d
Explanation:
Answer: I would say it how they form.
Explanation: for example sedimentary rocks form from rivière or other sources of water eroding rocks and depositing them in other places
what is mass percent formula
The molar mass and mass of each element in a mole of the compound are both solved for in the Mass Percent formula. Mass Percentage = (Mass of Solute / Mass of Solution) × 100
What does "Mass Percent" mean?
A component in a particular combination or a concentration can be described using the mass percent symbol. The mass of solute contained in a specific mass of solution is indicated by the mass percentage used to characterize the solution composition. The concentration of the solute is expressed in terms of mass or moles. By multiplying the grammes of solute per gramme of solution by 100, the mass percent of a solution can be computed.
The molar mass and mass of each element in a mole of the compound are both solved for in the Mass Percent formula. The mass proportion of each element can be determined using these masses.
(Mass of Solute / Mass of Solution) × 100 Equals Mass Percentage
Example: The process of making an aqueous solution of sodium chloride (CaCl₂). Determine how much calcium chloride, in the form of a 5%(m/m) solution, can be generated from 100 g of the chemical.
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what is the most appropriate action if a chemical has just splashed on a person's face in lab? [ select ]
If the eyes are not yet impacted, wash the face without taking off the goggles. Dry the chemical with paper towels or remove it with a wipe.
chemicals that contact the face or eyes In the event that chemicals come into contact with the face or eyes, utilize the eyewash station. Quickly wash your eyes for at least 15 minutes with flowing water from an eyewash station. To make the eyes stay open while flushing, gently open the eyelids with your fingertips.
DO NOT TAKE OFF your goggles if a chemical splashes on your face while you are wearing them. After cleaning the afflicted area, carefully take off your goggles covering your eyes. Burns: For 20 minutes, flush the area with cool water and let the instructor know.
The skin must be quickly cleansed with water for at least fifteen minutes after contaminated clothing has been removed. Before being worn again, clothes must be cleaned. For more details, see First Aid for Chemical Exposures.
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MARKING BRAINIEST Which conditions are necessary for hail to form?
Strong winds within the cloud bounce the frozen water around and add layers of frozen water.
Strong winds below the cloud cause the frozen water to melt and cause water vapor to condense.
The above freezing temperature of the air in the cloud adds more layers of ice to the water droplets.
The freezing temperature of the air below the cloud causes the water droplets to freeze.
The conditions that are necessary for hail to form is The freezing temperature of the air below the cloud causes the water droplets to freeze.
Which conditions are necessary for clouds to form?It should benoted that the Clouds form asd a result of the invisible water vapor in the air whichcondenses into visible water droplets whichis been conidered as the ice crystals.
It should benoted that this can take place wheen the parcel of air must be saturated, which implies that iot can no longer hold all the water it contains in vapor form, then it turns to condense into a liquid or solid form.
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when aqueous solutions of ________ are mixed, a precipitate forms.
When aqueous solutions of two soluble ionic compounds are mixed, a precipitate can form if the resulting combination of ions is insoluble. This is alluded to as a precipitation reaction.
The specific combination of ions that will form an insoluble precipitate will depend on their respective solubility rules. For example, mixing solutions of sodium chloride and silver nitrate will result in the formation of a white precipitate of silver chloride, since silver chloride is insoluble in water.
What is a precipitate?In chemistry, a precipitate is a solid substance that forms in a solution as a result of a chemical reaction. Precipitates are usually formed when two or more solutions containing dissolved ions are mixed together, causing the ions to combine and form a solid that is insoluble in the solution.
Precipitates can take different forms depending on the chemical reaction and the substances involved. They can be amorphous, meaning they have no distinct shape or structure, or they can be crystalline, meaning they have a defined shape and structure. They can also be fine powders or larger chunks, depending on the conditions under which they are formed.
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When comparing two sets of data, which one is more precise? Select one: a. The one with the smaller standard deviation b. The one with the mean further from the known value. c. The one with the mean closer to the known value d. The one with the larger standard deviation
The answer is a. The one with the smaller standard deviation.
The standard deviation serves as a gauge for how widely the data deviate from the mean. A smaller standard deviation indicates that the data points are more closely grouped around the mean, which means that the data set is more precise. In contrast, a larger standard deviation indicates that the data points are more spread out, which means that the data set is less precise.
The mean, on the other hand, is a measure of the central tendency of the data and does not necessarily reflect the precision of the data set. The mean can be influenced by outliers or extreme values, which can skew the value away from the known value.
Therefore, when comparing two sets of data, the one with the smaller standard deviation is more precise, regardless of whether the mean is closer or further from the known value.
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is density a physical property
Yes density is a physical property.
Properties are usually defined as the features that capable us to differentiate one material from another. A physical property is usually a characteristic of matter that never depends on its chemical composition.
Generally a physical property is defined as an attribute of matter which is independent of its chemical composition. Some of the main examples of physical properties density, color, hardness, melting and boiling points, and electrical conductivity.
Density is defined as the quantity of something per unit volume, unit area, or unit length or the mass of a substance per unit volume. Density is usually expressed in terms of grams per cubic centimeter.
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Now let's try one more example with biological relevance! here is a combustion reaction, which is also the process of photosynthesis. C6h12o6(s) 6 o2(g) -> 6 co2(g) 6 h2o(g) predict the sign of
The sign being referred to here is likely the ΔH sign, which indicates whether a reaction is exothermic (ΔH < 0) or endothermic (ΔH > 0).
In the case of the given combustion reaction, which is also the process of the photosynthesis in reverse, we can predict that it is an exothermic reaction because energy is released in the form of heat as well as light.
This can also be confirmed by the negative value of the enthalpy change (ΔH) associated with the reaction. Therefore, the sign of the ΔH for this reaction will be negative (ΔH < 0), indicating that it is exothermic.
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Electronegativity values for elements in Group 1A are much lower than the values for elements in Group 7A. What type of bond forms if an element from Group 1A bonds with an element from Group 7A?
a. ionic bond
b. hydrogen bond
c. polar covalent bond
d. nonpolar covalent bond
An ionic bond forms if an element from Group 1A bonds with an element from Group 7A. Option a is correct choice.
Electronegativity is a measure of an atom's ability to attract electrons towards itself in a covalent bond. Elements in Group 1A have low electronegativity values because they have one valence electron that is far away from the nucleus, making it easier to lose that electron. In contrast, elements in Group 7A have high electronegativity values because they have seven valence electrons that are close to the nucleus, making it easier to gain an electron.
When an element from Group 1A, such as sodium (Na), bonds with an element from Group 7A, such as chlorine (Cl), the electronegativity difference between the two atoms is significant. Sodium has a low electronegativity value, so it readily loses its valence electron to form a positively charged ion, Na+. Chlorine, on the other hand, has a high electronegativity value, so it readily gains an electron to form a negatively charged ion, Cl-. Therefore, the correct answer is (a) ionic bond.
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How many moles are in 9.50g of co2? Show your work
According to the phase diagram for H2O, what happens to the phases of water at 0C as the pressure is increased from 0 atm to 10 atm?
According to the forces of attraction and phase diagram , water changes from solid to liquid to gas.
What are forces of attraction?Forces of attraction is a force by which atoms in a molecule combine. it is basically an attractive force in nature. It can act between an ion and an atom as well.It varies for different states of matter that is solids, liquids and gases.
The forces of attraction are maximum in solids as the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.
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what is tungsten melting point?
Tungsten has a melting point of 3422 °C (6192 °F). With one of the highest melting points of any metal, tungsten is frequently used in high-temperature components including heating elements, rocket nozzles,
With an atomic number of 74, tungsten is a metallic element that is both uncommon and dense. It is one of the strongest metals known to man and has a high melting point. It is a silvery-white tint. The "heavy metal" tungsten is also referred to as is also known as wolfram. Due to its distinctive qualities, including its great resistance to corrosion and its capacity to tolerate extremely high temperatures without melting, it has a wide range of uses. Electrical connections, heating components, light bulb filaments, and aeronautical applications all often employ tungsten. In order to increase steel's strength and resistance to wear, it is also employed as an alloying element. Tungsten is regarded as a crucial
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Which of the following is a true statement? Select 2.
Gas particles are much smaller than the distances between them
Gas particles are the same size as the distances between them
Gas particles are much larger than the distances between them
The volume of a gas is mostly tightly packed particles.
The volume of a gas is mostly empty space.
The volume of a gas is equally empty space and tightly packed particles.
help plssssssssssssss
Answer:
B. each aquarium . . . the surroundings
Explanation:
Since the Final tempurature is less than the original. Both aquariums released thermal energy
why is the bohr atom described as a planetary model?
Answer:
The Bohr model is described as a "planetary model" because it exhibits the electrons orbiting around the nucleus on various levels.
The following sets of quantum numbers, listed in the order n, â„“, mâ„“, and ms, were written for the last electrons added to an atom. Identify which sets are valid and classify the others by the rule or principle that is violated. Drag the appropriate items to their respective bins.
The sets of quantum numbers, listed in the order :
a. 5 0 0 +1/2
5 0 0 -1/2
Valid
b. 3 2 -1 +1/2
3 2 0 +1/2
3 2 +1 +1/2
3 2 0 +1/2
3 2 +2 +1/2
Pauli violation
c. 3 1 -1 +1/2
3 1 0 +1/2
3 3 +1 +1/2
Other violation
For the a set;
5 0 0 +1/2
5 0 0 -1/2
This set will correctly corresponds to the 5s orbital and it is valid.
For the b set;
3 2 -1 +1/2
3 2 0 +1/2
3 2 +1 +1/2
3 2 0 +1/2
3 2 +2 +1/2
This set should correspond to the 3d orbital but it is clear that the two electrons in the set that have the exactly the same quantum numbers of the 3 2 0 +1/2. This violates the Pauli exclusion and it is Pauli violation.
For the c set:
3 1 -1 +1/2
3 1 0 +1/2
3 3 +1 +1/2
This set should have the corresponded to the 3p orbital but the values of l only range from the 0 to (n - 1). This is other violation.
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The following sets of quantum numbers, listed in the order n, l, ml, and ms were written for the last electrons added to an atom. Identify which sets are valid and classify the others by the rule or principle that is violated.
choices for these answers are: "other violation," "pauli violation," and "valid."
a. 5 0 0 +1/2
5 0 0 -1/2
b. 3 2 -1 +1/2
3 2 0 +1/2
3 2 +1 +1/2
3 2 0 +1/2
3 2 +2 +1/2
c. 3 1 -1 +1/2
3 1 0 +1/2
3 3 +1 +1/2
what is the most common type of chemical sedimentary rock?
The most common type of the chemical sedimentary rock is limestone.
Limestone is primarily composed of the mineral calcite (CaCO₃) and forms from the precipitation of calcium carbonate in environments such as shallow marine waters, lakes, and caves.
Limestone can also form from the accumulation of shells and other skeletal remains of marine organisms that are rich in calcium carbonate. When these organisms die, their remains settle on the ocean floor and become buried by sediment. Over time, the sediment compacts and cements the shells and other materials together, forming limestone.
Other types of chemical sedimentary rocks include evaporites, which form from the evaporation of saline water, and chert, which is formed from the accumulation of silica-rich remains of marine organisms.
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Consider the directing effects of the substituents on salicylamide and predict the possible structures of the iodination product.
OH is an ortho/para directing activating substituent. The amide group inhibits the activity of the meta directing substituent. 3 and 5 positions appear to be the most advantageous.
What is salicylamide?Salicyl amide is indeed a non-prescription analgesic and antipyretic medication. Its medical applications are comparable to that of aspirin. In the prescription pain reliever Pain Aid, salicyl amide is combined with aspirin and caffeine.
OH is an ortho/para directing activating substituent. The amide group inhibits the activity of the meta directing substituent. When both impacts are considered, the 3 and 5 positions appear to be the most advantageous.
Therefore, 3 and 5 positions appear to be the most advantageous.
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Which of the following cannot form hydrogen bonds with water?
a. CH₃OCH₃
B. NA⁺
C. F⁻
D. HCOOH
The one from the following which cannot form the hydrogen bonds with the water is the Na⁺. The correct option is B.
The hydrogen bond is the interaction that involves the hydrogen atom that is present in between the pair of the other atoms having the high affinity for the electrons and such the bond is the weaker than the ionic bond or the covalent bond but this bond is stronger than van der Waals forces. The hydrogen bond is the type of an intermolecular force (IMF) that will forms the special type of the dipole - dipole attraction .
Thus, as there is no electronegative atom in the Na⁺, therefore, it cannot form the hydrogen bond with the water.
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Identify the acid associated with each conjugate base. Choose... SO42- Choose... Cl- Choose... OH Choose... F Choose... v
A conjugate base is a species that is created by taking a proton out of an acid since, in the opposite reaction, it might help a hydrogen ion.
The conjugate acid of sulphate (SO42−) is hydrogen sulphate (HSO42−)The conjugate acid of OH− is H2O because when OH− gains a hydrogen ion, it forms H2O.Cl − Chloride ion HCl Hydrogen chlorideF–Choose...HF Water HCl HI Hydronium ion Bisulfate ion Sulfuric acidAccording to the Bronsted-Lowry acid-base theory, a conjugate acid is a chemical molecule that is created when an acid donates a proton to a base; in other words, it is a base that has had a hydrogen ion added to it, as in the opposite reaction, the base loses a hydrogen ion.
The conjugate base of some acids may also be acidic since they have the capacity to liberate a few protons.
According to Bronsted-concept Lowry's of acids and bases, a conjugate acid-base pair consists of two compounds that differ most from one another when a proton (H+) is present.
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The volume of a gas is proportional to its pressure if the temperature is held constant.a. Trueb. False
When the gas's temperature and pressure are kept constant, the volume and number of moles of the gases are precisely proportional. The assertion is accurate.
What is a mole on the body?A mole, also known as a naevus, is a common skin growth that appears when melanocytes, the cells that produce color, cluster together. On your skin, they appear as tiny, dark marks or, occasionally, as lumps that are flesh-colored. Moles can come in a variety of hues, forms, and sizes.
When should I worry about a mole?A concerning mole, on the other hand, is asymmetrical, which means that if you split it in half, the two halves do not look the same. Normally, the border of benign moles is regular and rounded. Borders on cancerous moles typically contain irregularities.
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colligative properties depend only on solute concentration; the identity of the solute is not important. True or False
The given statement "colligative properties only depend on solute concentration; the identity of the solute is not important" is true. Because colligative properties arise from the effect of solute particles on the physical behavior of the solvent, rather than any specific chemical interactions between the solute and solvent.
Colligative properties such as freezing point depression, boiling point elevation, osmotic pressure, and vapor pressure lowering depend only on the concentration of solute particles in a solution, regardless of the identity of the solute.
Colligative properties have many practical applications, such as in determining the molecular weight of a solute, the osmotic pressure in biological systems, and in the antifreeze properties of solutions used in automobiles.
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Which metal has the highest melting point?
a thallium
b tungsten
C cobalt
d osmium
The metal with the highest melting point among the options provided is tungsten (b).
Hope it helps :)
Answer:
b. Tungsten
Explanation:
The element with the highest melting point is tungsten (symbol: W), also known as wolfram. Tungsten has the highest melting point of any metal and the second-highest melting point of any element after carbon. Its melting point is 3422 °C (6192 °F). Tungsten is a transition metal and is known for its high density, hardness, and resistance to heat and corrosion. It is used in a variety of applications, including light bulb filaments, electrical contacts, and X-ray tubes. Thallium, cobalt, and osmium are not known for their high melting points.
What pathways would be necessary to carry you to the leaves of these trees .All of the above.1. apoplastic2. bulk flow3. symplastic4. transmembrane
The pathways that would be necessary to carry you to the leaves of these trees are apoplastic, bulk flow, symplastic and transmembrane. Hence, option 5 (all of the above) is correct.
Generally, the apoplast is defined as the space outside the plasma membrane consisting of intercellular spaces where the material diffuses freely.
Generally, mass flow or bulk flow is defined as the movement down a pressure gradient ( a pressure gradient in plants is observed due to variations in solute concentration) or the temperature gradient of substances in bulk or in masses.
Symplast is generally considered as the living part of the plant tissue without the presence of a cell wall and intercellular spaces in it.
Generally, the transmembrane protein (TP) is a type of integral membrane protein which spans the entirety of the cell membrane. Hence, option 5 is correct.
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what is so3 2 lewis structure?
Lewis structure for SO₃²⁻ has three double bonds between sulfur and oxygen, and each oxygen has one lone pair. This structure has 24 valence electrons.
Firstly, count the total number of valence electrons in the molecule/ion. For SO₃²⁻, sulfur contributes 6 electrons, each oxygen contributes 6 electrons, and the -2 charge adds 2 electrons, giving a total of 24 valence electrons.
Connect with the outer atoms to the central atom with a single bonds. In this case, each oxygen (O) is bonded to the sulfur (S) with a single bond.
Place the remaining electrons on the outer atoms to satisfy the octet rule. In this case, there are 18 electrons remaining after step 3. We can place 3 lone pairs (6 electrons) on each oxygen atom, which satisfies their octet rule.
Check if the central atom (S) has an octet. In this case, S has only 6 electrons around it, so it needs to form some double bonds.
To complete the octet of sulfur, we can move one of the lone pairs from each of the three oxygen atoms to form three double bonds between sulfur and oxygen atoms.
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what is benzoic acid melting point?
Benzoic acid's melting point is 122.4°C (252.3°F). It is a white solid used as a food preservative and in pharmaceuticals.
Benzoic corrosive is a white translucent strong with the substance equation C6H5COOH. It is a typical natural corrosive utilized in the creation of food additives, like sodium benzoate. The liquefying point of benzoic corrosive is 122.4°C (252.3°F), and that implies it can exist as a strong at room temperature. At the point when warmed, the intermolecular powers that keep the particles intact debilitate, permitting the strong to progress to a fluid. The dissolving point of benzoic corrosive can be impacted by variables like pollutions and strain. Notwithstanding its utilization as a food additive, benzoic corrosive has different applications, incorporating as a part in drugs and as a forerunner to different synthetic compounds.
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What is the specific weight of water in SI units?
The specific weight of water is 9.81 kN/m³ in SI units.
The specific weight is a measure of the weight per unit volume of a material. In the case of water, it is the weight of a given volume of water under the influence of gravity. The specific weight is different from density, which is a measure of the mass per unit volume of a substance.
In SI units, the specific weight of water is typically expressed in newtons per cubic meter (N/m³) or kilonewtons per cubic meter (kN/m³). Since the acceleration due to gravity is approximately 9.81 m/s², the specific weight of water is 9.81 kN/m³.
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what is list of strong acids
The typical strong acids are hydrochloric acid (HCl), sulfuric acid (H2SO4), nitric acid (HNO3), hydrobromic acid (HBr), and hydrochloric oxide (HClO4) (perchloric acid)
What is meant by strong Acid?An acid that entirely dissociates in an aqueous solution is referred to be a strong acid. It is a chemical species that may lose a proton, H+, very quickly. Strong acids lose one proton in water, which the liquid then absorbs to produce the hydronium ion:
HA(aq) + H₂O → H₃O+(aq) + A−(aq)
Although diprotic and polyprotic acids may lose more than one proton, only the first proton is considered to be lost in the "strong acid" pKa value and reaction.
Strong acids have a pH that is low.
There are lots of weak acids but few strong ones. The typical strong acids are hydrochloric acid (HCl), sulfuric acid (H2SO4), nitric acid (HNO3), hydrobromic acid (HBr), and hydrochloric oxide (HClO4) (perchloric acid).
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What type of bcl3 ? polar or nonpolar?
The chemical boron trichloride (BCl3) is nonpolar. The molecule has a trigonal planar structure, with three chlorine atoms surrounding the central boron atom.
In BCl3, three chlorine atoms form covalent connections with the boron atom. While chlorine has seven valence electrons, boron's valence shell only has three. Boron thus forms three single covalent connections with three chlorine atoms by sharing its three valence electrons with them. The three B-Cl bonds are all polar because chlorine has a stronger electronegativity than boron. The three chlorine atoms are, however, symmetrically positioned around the primary boron atom because the molecule has a trigonal planar geometry and is symmetrical. This configuration causes the three B-Cl bonds' dipole moments to cancel out, resulting in a net dipole moment of zero. As a result of its lack of polar bonds, BCl3 is regarded as a nonpolar molecule.
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A student accurately measured the volume of a solution, but spilled some before measuring solution mass. what is the effect on calculated solution density?
Answer:
The calculated solution density is lower than the actual density.
Explanation:
If the student spilled some of the solutions before measuring the mass, the calculated mass of the solution will be lower than the actual mass of the solution. This means that the calculated density of the solution will be higher than the actual density of the solution since the calculated density is the mass of the solution divided by the measured volume of the solution. In other words, the calculated density will be overestimated due to the lower measured mass of the spilled solution, leading to a potential error in the density measurement.
Assuming that the spilled solution was of the same density as the remaining solution, the effect of spilling some of the solutions before measuring the mass would be that the calculated solution density would be lower than the actual density. This is because the calculated density is based on the measured mass and the remaining volume, which is now smaller than the actual volume due to the spilled solution. As a result, the calculated density would be lower than the actual density.
