Answer:
B. The transition of heat across matter
Answer:
I Would THINK: B
because the definition is: "The process by which heat is transferred through a substance when there is a difference of temperature."
How many hydrogen molecules are in 1.2 moles of hydrogen?
Answer:
7.22 x 10²³molecules
Explanation:
Given parameters:
Number of moles of hydrogen = 1.2moles
Unknown:
Number of molecules of hydrogen = ?
Solution:
From the concept of moles, a mole of a substance contains the Avogadro's number of particles.
1 mole of a substance = 6.02 x 10²³ molecules;
So; 1.2 moles of hydrogen = 1.2 x 6.02 x 10²³ molecules;
= 7.22 x 10²³molecules
what mass of kcl in grams must be added to 500 ml of a 0.15 m kcl solution to produce a 0.40 m solution
no of moles of KCl = molarity * volume in L = 0.15*0.5
How many grams of KCl is required to make its 500 mL?Therefore, we can infer that option (c), which states that 37.3 g grammes of potassium chloride (KCl) must be added to 500 ml of M KCl solution, is the correct response. Note: - The terms molality and molarity should not be confused. The ratio of moles of solute to kilogrammes of solvent is known as molality.
It's important not to mix up the terms molality and molarity. The ratio of moles of solute to kilogrammes of solvent is known as molality. The letter m stands for molality.
- As opposed to molarity, which measures the number of moles of solute to the volume of solution. M stands for molarity.
- Don't forget to include the unit in your solution.
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moderates weather so that highs and lows are less extreme
I need the factor of that
Moderates weather so that highs and lows are less extreme because of sea breeze motion.
Sea breeze are that as the warm air from the land is rising and the cooler air from the ocean is flowing over land and will replace the warmer air that is rising. in simple words , land gets warmer during the day than the water and the hot air rising up and cooler air move towards the land called as sea breeze. moderate weather is refers to that weather which is neither very cold nor very hot.
Thus, Moderate weather so that highs and lows are less extreme because of sea breeze motion.
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What made alchemy unscientific in its practices?
A. It was not accepted by scientists.
B. It could not turn metal into gold.
C. It was not based on evidence and experiment.
D. It was not based on the atom being the basic unit of matter.
Answer:
C
Explanation:
science is basically must base on the
evidence and experiment which
alchemy usually don't do these things
Alchemy was unscientific in its practices as It was not based on evidence and experiment. Hence , Option (C) is correct
What is Alchemy ?
A medieval chemical science and speculative philosophy aiming to achieve the transmutation of the base metals into gold, the discovery of a universal cure for disease, and the discovery of a means of indefinitely prolonging life.
Therefore , Alchemy was unscientific in its practices as It was not based on evidence and experiment. Hence , Option (C) is correct
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A balloon contains a 10% glucose solution. The balloon is permeable to water but not to glucose. A beaker contains a 5% glucose solution. What will happen when the balloon is submerged in the beaker
The state of the balloon:
When the balloon is submerged in the beaker, the amount of water in the beaker will get reduced.
What is Osmosis:
Based on the concentration of solutes on both sides of the membrane, water will flow through a permeable membrane in a specific direction.
Hypertonic solution:
It means that there are more solutes present in the surrounding environment than in the cell itself.
Hypotonic solution:
In a hypotonic solution, the concentration of solutes inside the cell is higher than that outside the cell.
When comparing two solutions, the one with the larger solute concentration is hypertonic, and the one with the lower solute concentration is hypotonic. Isotonic solutions have an identical solute concentration.While the solution in the beaker is hypertonic, Meaning that will draw water molecules out of the cell. As water molecules move from a location of high water potential (dilute solution) to a region of reduced water potential (10% glucose solution), the water from the 5% glucose solution will flow into the 10% one (concentrated solution)This is the reason why the amount of water decreases when the balloon is submerged in the beaker.Learn more about the glucose solution and permeability here,
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How are conifers classified? (Select all that apply.)
do not have seeds
a vascular plant
have seeds
a nonvascular plant
Answer: a vascular plant and have seeds
Answer:
A and C
Explanation:
Describe an experiment that can be conducted to show that living materials contain water
Answer:
MATERIALS:graduated one liter bottle1 white carnation with long stem2 glassesred and blue food coloringPROCEDURE:1. Pour 500 ml of water into each glass.2. Add three or four drops of food coloring to each glass. Be sure the color is dark. Add more food coloring if necessary.3. Very carefully cut the stem in half along the length of the stem from the bottom to about half way up to the flower.4. Place one half of the flower stem in the blue water and the other half of the stem in the red water.5. Let the flower stand in the water for 48 hours (2 days).6. Enrichment: Repeat the experiment with another flower, but cover the flower only with plastic wrap and secure the bottom of the plastic wrap with tape.DATA: Be sure to record your observations and inferences.CONCLUSION: This is not optional. You must explain what you learned by doing this activity.
Explanation:
try this with the help of ur parents or teacherLet us consider a stem to be a living material in this case:
An experiment that can be conducted to show that living materials contain water can be shown below:
An activity to show that stem conducts water and other substances is given below:
1) Take a glass and put some water in it.
2) Put a few drops of red ink in the water.
3) Cut the stem from the base of an herb plant.
4) Place the stem in the glass.
5) Results are observed, some parts of the stem become red and they indicate that water is being conducted through the stem.
Thus, we can say that through this activity that living material contains water. A stem is a part that connects the roots to the leaves, stores food, provides support, and holds the flowers, leaves, and buds.
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Suppose you have 100. 00 ml of a solution of a dye and transfer 2. 00 ml of the solution to a 100. 00ml volumetric flask. After adding water to the 100. 00 ml mark, you take 5. 00 ml of that solution and again dilute to 100. 00 ml. If you find the dye concentration in the final diluted sample is 0. 000158 m, what was the dye concentration in the original solution.
The dye concentration in the original solution was 0.158 M.
The dye concentration in the original solution is determined from the dilution formula as follows:
The product of concentration and volume of initial solution is equal to the product of concentration and volume of final solution .
M₁V₁ = M₂V₂
Where M₁ = initial concentration
V₁ = original volume
M₂ = final concentration
V₂ = final volume
For the final dilution:
M₁ = M₂V₂/V₁
M₁ = 0.000158 × 100/5
M₁ = 0.000316 M
For the first dilution:
M₁ = M₂V₂/V₁
M₁ = 0.00316 × 100/2
M₁ = 0.158 M
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CsH16 +12028CO2 +8H₂O
What is the ratio of octene (C8H16) to
oxygen in the reaction?
The ratio of octene to oxygen is 1:12.
To determine the ratio of octene (C8H16) to oxygen (O2) in the given reaction, we need to examine the balanced chemical equation. However, the equation you provided does not seem to be balanced. The coefficients for each compound must be determined to achieve a balanced equation before we can calculate the desired ratio.
Assuming you meant the combustion reaction of octene, a balanced equation would be:
C8H16 + 12O2 → 8CO2 + 8H2O
From the balanced equation, we can see that for every 1 mole of octene (C8H16), we require 12 moles of oxygen (O2) to completely react.
This means that for every 1 mole of octene, we need 12 moles of oxygen to fully combust the octene and produce the corresponding amounts of carbon dioxide (CO2) and water (H2O) as shown in the balanced equation.
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For the following equilibrium, if the concentration of b− is 8. 3×10−7 m, what is the solubility product for the salt ab?
The equilibrium equation for the salt AB can be represented as;AB ⇌ a^+ + b^-Ksp= [a^+] [b^-]The solubility product for the salt AB.
Ksp is given by the product of the molar concentration of the two ions raised to their respective powers. For the given equilibrium, the concentration of b^- is 8.3 × 10^-7 M, then the solubility product can be calculated by substituting the concentration of b^- into the equilibrium equation.Ksp = [a^+] [8.3 × 10^-7].Hence, the solubility product for the salt AB can be determined by multiplying the concentration of the ions raised to their respective powers. In this case, the concentration of b^- is 8.3 × 10^-7 M, then the solubility product can be calculated by substituting the concentration of b^- into the equilibrium equation.
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A scientist observes hot water erupting from a vent in the Earth.What most likely caused the water to rise and erupt from the vent? someone pls answer i if u answer u get 57 points
Answer/Explanation:
A geyser is hot water erupting from a vent in the earth. Geysers are somewhat rare and occur in certain parts of the earth. Underneath, there are hidden chambers that provide constant flows of water. Sometimes when the tectonic plate of the earth move, it leaves gaps in between the hot earth's inner core and the ground. The magma inside is able to heat up the water from the earth. Since hot particle tend to rise, the water explodes out of the vent with such power from the heat.
Please write down the definitions of elements, compounds, mixtures, homogenous mixtures, and heterogenous mixtures.
Electric field lines /Conductor/ Electroscope/ Insulator Elementary charge/ Electric field/ Charging by conduction/ Charging by induction/ Potential difference
1. Separation of charges in an object without touching it is____________.
2. The work done moving a positive test charge between two points in an electric field divided by the magnitude of the test charge is the electric _________.
3. An electric __________ is a material through which charges move about easily. ___________ is giving a neutral object a charge by touching it with a charged object.
4. A material through which electrical charges does not move easily is an electrical _____.
5. The lines providing a picture of the size and strength of the field around a charged object are called the ________.
6. The property of the space around a charged object that exerts a force on other charged objects is the ______.
7. A device that helps determine charge using pieces of metal foil is a(n) _______.
8. The magnitude of the charge of an electron is the ________.
Answer: See explanation
Explanation:
1. Separation of charges in an object without touching it is (charging by induction).
2. The work done moving a positive test charge between two points in an electric field divided by the magnitude of the test charge is the electric (potential difference).
3. An electric (conductor) is a material through which charges move about easily. (Charging by conduction) is giving a neutral object a charge by touching it with a charged object.
4. A material through which electrical charges does not move easily is an electrical (insulator).
5. The lines providing a picture of the size and strength of the field around a charged object are called the (electric field lines).
6. The property of the space around a charged object that exerts a force on other charged objects is the (electric field).
7. A device that helps determine charge using pieces of metal foil is an (electroscope).
8. The magnitude of the charge of an electron is the (elementary charge)
Which of the following is the correct classification for both calcium and iron? A) Ca is a transition element and a metal and Fe is a transition element and a metal. B) Ca is a transition element and a metal and Fe is a transition element and a nonmetal. C) Ca is an alkali metal element and a metal and Fe is a transition element and a nonmetal. D) Ca is an alkaline earth element and a metal and Fe is a transition element and a metal. E) Ca is an alkali metal element and a nonmetal and Fe is a halogen element and a metal.
The correct classification for both calcium (Ca) and iron (Fe) is:
D) Ca is an alkaline earth element and a metal, and Fe is a transition element and a metal.
Calcium (Ca) belongs to the alkaline earth metals group, which is located in Group 2 of the periodic table. Alkaline earth metals are characterized by their reactivity, high melting points, and tendency to form 2+ cations. Therefore, Ca is classified as an alkaline earth element and a metal.
Iron (Fe) is a transition element, also known as a transition metal. Transition metals are located in the d-block of the periodic table and are characterized by their ability to form multiple oxidation states and exhibit variable valencies. Fe is classified as a transition element and a metal due to its properties and location in the periodic table.
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Which is stronger an acid or an alkali
Answer:
.AN ACIDExplanation:
is the stronger
both will be equally strong because when you add them together with a pretty much equal ph such as 5 and 9 ph then it makes it neutral meaning they are just as strong as eachother
1
Which of the following is a mixture?
A air
B copper
C oxygen
D steam
Answer:
A air
Explanation:
Air is a mixture but not compound. Its constituents can be separated. For example: oxygen, nitrogen etc. by physical process.
When naming the second nonmetal in a covalent molecule, the numerical value is indicated by a __.
Answer:
roman numeral
Explanation:
what is the carbon concentration of an iron-carbon alloy just below the eutectoid for which the fraction of total ferrite is 0.9
The carbon concentration of an iron-carbon alloy just below the eutectoid can be determined using the lever rule and it is calculated to be 0.0002.
The lever rule is a mathematical expression used to calculate the fractions of two phases in an alloy based on their compositions. In this case, we are given that the fraction of total ferrite is 0.9. The total ferrite fraction is the fraction of ferrite plus the fraction of cementite (which is the other phase in the eutectoid alloy). Since the eutectoid alloy contains 0.022% carbon, we can assume that the fraction of cementite is 1 - 0.9 = 0.1.
Using the lever rule, we can write the equation:
Fraction of ferrite = (Carbon concentration - Carbon concentration of cementite) / (Carbon concentration of ferrite - Carbon concentration of cementite)
Since the carbon concentration of ferrite is 0.022% and the carbon concentration of cementite is 6.7%, we can substitute these values into the equation:
0.9 = (Carbon concentration - 6.7%) / (0.022% - 6.7%)
Simplifying the equation, we get:
0.9 * (0.022% - 6.7%) = Carbon concentration - 6.7%
Solving for the carbon concentration, we find:
Carbon concentration = 0.9 * (0.022% - 6.7%) + 6.7%
= 0.0002
Therefore, the carbon concentration of the iron-carbon alloy just below the eutectoid, for which the fraction of total ferrite is 0.9, can be calculated using the lever rule.
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Petroleum is a mixture of many alkanes. The alkanes are separated and purified at oil refineries. What process decribes what happens in an oil refinery?
Answer:
Fractional distillation
Explanation:
The process of separating petroleum products into its fractions is called fractional distillation.
Fractional distillation is a method of separating a mixture of substances based on the differences in their boiling points.
Petroleum is a mixture of hydrocarbons separated in a large fractionation tower having many trays maintained at different temperatures.
As the vapor containing the petroleum mixture ascends the fractionation tower, the mixture is separated at each tray to yield the various fractions of petroleum.
In the early 1900s, Ernest Rutherford set up an experiment to study the atom. He bombarded thin metal sheets with protons and neutrons. He found that most of particles got deflected a bit, but some of them bounced back as if bouncing off a brick wall. What conclusion came from this experiment?
Answer:
Atoms are mostly empty space.
How many grams of solute is there in 250 mL of a 0.10M CaCl2 solution ?
Answer:
2.775 g
Explanation:
Given that;
Number of moles = concentration × volume
Concentration = 0.10M
Volume =250 mL
Number of moles = 250/1000 × 0.10
Number of moles = 0.025 moles
Also;
Number of moles = mass/molar mass
Molar mass of CaCl2= 111 g/mol
Mass = Number of moles × molar mass
Mass = 0.025 moles × 111 g/mol
Mass= 2.775 g
a sealed flask initially contains pure nitrogen dioxide gas (no2). over time, the nitrogen dioxide forms dinitrogen tetroxide gas (n2o4). the graph below shows the relative amounts of (no2) and (n2o4) over time. what is true about the time indicated by the blue arrow? a. no2 molecules are no longer reacting to form n2o4 molecules. b. the reactant has been used up so the reaction can no longer proceed. c. the rate of the forward reaction (n2o4 formation) is equal to the rate of the reverse reaction (no2 formation). d. the activation energy required for the reaction to occur has been used up.
Based on the given information, the true statement about the time indicated by the blue arrow is: (c) The rate of the forward reaction (N₂O₄ formation) is equal to the rate of the reverse reaction (NO₂ formation).
The graph shows the relative amounts of NO₂ and N₂O₄ over time, and the point indicated by the blue arrow represents a state of equilibrium. In an equilibrium state, the forward and reverse reactions occur at equal rates.
The concentrations of NO₂ and N₂O₄ reach a constant value, indicating that the conversion of NO₂ to N₂O₄ and the conversion of N₂O₄ to NO₂ are occurring at the same rate.
Option a suggests that NO₂ molecules are no longer reacting, which is incorrect as the reaction is still ongoing at equilibrium. Option b suggests that the reactant has been completely used up, which is not the case in an equilibrium state. Option d refers to the activation energy, which is unrelated to the equilibrium state. Therefore, option c is the correct choice.
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select the more electronegative element of this pair. a. phosphorus (p) b. antimony (sb)
The more electronegative element of the pair is antimony (Sb).
Electronegativity is a measure of an atom's ability to attract shared electrons in a chemical bond. Antimony has a higher electronegativity value compared to phosphorus, indicating that it has a stronger pull on electrons when forming chemical bonds.
In the given pair of elements, antimony (Sb) and phosphorus (P), antimony is the more electronegative element. The electronegativity values are as follows:
Antimony (Sb): Electronegativity value of approximately 2.05 (Pauling scale).
Phosphorus (P): Electronegativity value of approximately 2.19 (Pauling scale).
The Pauling scale is a commonly used scale to express electronegativity values. According to this scale, higher electronegativity values indicate a stronger pull on electrons in a chemical bond.
Based on the electronegativity values, we can conclude that antimony has a slightly lower electronegativity compared to phosphorus. Therefore, antimony is considered the more electronegative element in this pair.
When antimony forms chemical bonds, it tends to attract electrons more strongly than phosphorus. This stronger electron-attracting ability of antimony is due to its higher electronegativity.
It implies that antimony has a greater tendency to acquire a partial negative charge in a chemical bond compared to phosphorus.
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The "fuel" in most combustion reactions
is a hydrocarbon. Using the examples in
Model 2, write a description for the
classification of substances known as
hydrocarbons.
Answer:
hydracarbons are substances consisting of carbon and hydrogen only
Explanation:
Give the following acid/base reaction:
HI(aq) + NH3(aq) ↔ NH4+(aq) + I-(aq)
Determine which substance is the acid, base, conjugate acid, and conjugate base.
Column A Column B:
1. Acid 1: I-
2. Base 2: HI
3. Conjugate base 3: NH3
4. Conjugate acid 4: NH4+
Answer:
6=100
Explanation:
Which of these statements is false? The least reactive elements are in the far right column. Elements at the bottom of a column have more protons than elements at the top of a column. Elements on the left side of a row always have higher atomic mass than elements on the right side of that row. Elements along the steplike line have some properties of metals and some properties of nonmetals.
Answer:
Elements on the left side of a row always have higher atomic mass than elements on the right side of that row.
Explanation:
the answer I have above should be correct because it’s false so it’s the right answer.
watch the video on electron affinity and identify which of the following statements matches each reaction.
Electron affinity is the energy change that occurs when an electron is added to a neutral atom, turning it into a negatively charged ion. Here are the statements: Reaction 1 and Reaction 2.
1. Reaction 1: A neutral atom in the gas phase gains an electron and becomes a negatively charged ion, releasing energy in the process. This reaction demonstrates a positive electron affinity value, which means that the atom has a high tendency to attract and gain electrons. An example of such a reaction is: Cl (g) + e- → Cl- (g).
2. Reaction 2: A neutral atom in the gas phase gains an electron, but instead of releasing energy, it absorbs energy. This reaction demonstrates a negative electron affinity value, which indicates that the atom has a low tendency to attract and gain electrons. This typically happens in elements that have a stable electron configuration, like noble gases. An example of this reaction is: Ne (g) + e- → Ne- (g) + energy.
In summary, the first reaction shows a positive electron affinity value, meaning the atom has a high tendency to attract and gain electrons, while the second reaction shows a negative electron affinity value, indicating a low tendency to gain electrons.
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Consider the following processes of ideal gases. Which of these processes leads to an increase in entropy? Select all of the correct answers.
The pressure of one mole of oxygen gas is allowed to double isothermally.
Carbon dioxide is allowed to expand isothermally to 10 times its original volume.
Nitrogen gas is compressed isothermally to one half its original volume.
A glass of water loses 100 J of energy reversibly at 30°C.
The only situation where there is an increase in entropy;
Nitrogen gas is compressed isothermally to one half its original volume.The pressure of one mole of oxygen gas is allowed to double isothermally.What is entropy?The term entropy has to do with the degree of disorder in a system. Thus we must recall that gases tend to move very freely and the the gas does not have a particular or a fixed shape or volume. Hence, the level of the disorderliness would increase so much when a gas is produced.
The entropy is least when we have a solid because the particles that compose a solid are all held together in such a way that the particles do not move about freely in the system.
Thus, when there is an isothermal compression of the gas, the molecules of the gas collide more frequently with each other and entropy increases.
When a gas expands, it spreads out and entropy is reduced. When a glass of water looses energy, the molecules of the water would decrease in speed and entropy is reduced.
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Why isn't energy ever truly destroyed?
Answer:
In physics, the law of conservation of energy states that the total energy of an isolated system cannot change—it is said to be conserved over time. ... Energy can be neither created nor destroyed, but can change form; for instance, chemical energy can be converted to kinetic energy.
Explanation:
Differentiate the particles in terms of location, charge, and relative
Explanation:
location:
charge: 89%
relative:t h e y r e f i n e , a n d so a n d t h e n
t h a n k s f o r t h e p o i n t s