Sublimation of an element or compound is the change from a solid directly to a gas with no intermediate liquid stage. Sharada was told that if pepper seeds are placed along with camphor, the sublimation of camphor would reduce. Of these boxes, (some are open and some are closed) which two should she use to check whether this is true?
Give a detailed answer
Answers
The two which she should use to check whether the sublimation of camphor would reduce if pepper seeds are placed along with it are P and S and is denoted as option C.
What is Sublimation?This is referred to as the transition of a substance directly from the solid to the gas state, without passing through the liquid state and an example is iodine crystal.
Options P and S are both open boxes and one contains only camphor while the other contains camphor and pepper seeds which is used to compare their rate of sublimation to know if the addition of the seeds caused a reduction.
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Related Questions
A package of M&M's was placed in a Calorimeter that had 200.0g of water at 35.00°C. The sample was then ignited to release its energy. The
temperature of the water increased to 550.0°C. Calculate the number of food Calories (Cal) that are in the package of M&M's. Round your Calories
according to sig fig rules
Answers
Here the substance is water. So, we need to know the value of specific heat capacity of water to solve this question.
The specific heat capacity of water is 4.18 J/g° C.
This is the heat required to increase the temperature by one degree Celsius. To increase the temperature by 20 degree C, the heat required will be 2 times of 4.18 J/g° C.
The heat required to raise the temperature of n grams of a substance by m0C will be,
Let us rewrite the equation as,
q = mc Δ t
Where q is the heat required, m is the mass of the substance, c is the specific heat capacity of the substance and Δ t is the temperature difference.
Given that,
m = 200g
Δ t = 55° C – 35° C = 20° C
c = 4.18 J/g° C
Let us substitute the values:
q = 200*4.18*20
Hence the heat required is 16720J.
Converting it to kJ, the heat required to raise the temperature of 200 grams of water from 55° C to 35° C is 167 KJ.
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The number of food Calories (Cal) that are in the package of M&M's are
431000 Joules.
When we measure the temperature change of the calorimeter, we may use this equation to compute the heat released by a sample because the calorimeter is an instrument for which we are aware of (or can ascertain) its heat capacity.
When a liquid absorbs or loses energy, the temperature of the liquid varies.
In accordance with the formula
Q= mCΔT
m = 200g
ΔT = 550 - 35
ΔT = 515
C = 4.182 J/kg °C
Q is equal to 200 * 4182 * 515
Q = 430746 Joules.
Water has a 4,200 J/kg°C (joules per kilogram per degree Celsius) specific heat capacity. This indicates that 4,200 J are required to increase the temperature of 1 kilogram of water by 1°C.
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whoever responds first will get brainliest :) Reactions must be balanced because of the conservation of matter, which means all of these EXCEPT which one (Which is WRONG about balancing)?
A. Atoms cannot be destroyed
B. New elements, but not new substances can form New substances
C. New substances, but not new elements can form
D.Atoms cannot be created
Answers
Select the correct answer.
Which of the following locations is best suited for siting a concentrated solar power plant?
Answers
Variations in the solar resource are probably the first and main consideration. You can use local weather stations where available, otherwise satellite data (eg from NASA's website) or commercial databases such as Meteonorm. Also there is quite a comprehensive set of data files in the SAM software
Other important considerations are
local environment: plants and animals that could be affected by the system; community support and buy-in.wind, hail, rain, snow profile for the location in question. if there are high/tropical winds then it will increase the plant cost.flight paths and roads near the plant which could be affected by glint and glareproximity to a local town where staff will be able to live both during construction and later during operationproximity to a electricity transmission line with available capacityavailability of water for mirror cleaning and steam blowdown.cost (and availability) of electricity in the area. If remote, electricity/energy may be very expensive, which will enable a high price for electricity sold from the plant.quality of road to the plant, required to bring equipment and materials to sitepolitical stability of the region -- potential impact on perceived bankability of the project.
Many of these items will have a large influence on the cost of the plant and/or the revenue it will generate during its life. Others relate to environmental and risk factors and are also critically important to consider.
Hope this helps!!
Please help, I’ll mark your answer as brainliest.
Answers
Answer:
Radon, Bismuth, Lead, and Thallium
Explanation:
Its from smallest to largest. Hope it helps!
Sn2+(aq) + Cr2O7^2- (aq) + 14H+(aq) → 3Sn4+(aq) + 2Cr3+(aq) + 7H2O(l)
Volume = 6.64 mL
The moles of Cr2O7^2-(aq) that reacted, expressed in scientific notation, is a.bc x 10-dmol. The values of a, b, c and d are..?
The concentration of Sn2+(aq), expressed in scientific notation, is a.bc x 10-d mol/L. The values of a, b, c and d are..? (use previous recorded answer to answer this question)
Answers
The chemical reaction is fe2+ Pt(s) ∣ fe3+ (aq) ∣∣cr2O²-7(aq),cr+3(aq) ∣ Pt(s)
How to calculate chemical reaction ?Reaction where particular set of chemicals changes into another form without changing their nuclei just the transfer or sharing of electrons and formation and breaking of bonds is called as chemical reaction.
cr-2 7 (aq)+ 14H+(aq)+ 6fe2+(aq)⟶6fe+3(aq)+2cr+3 (aq)+7h2 O(l)
Here, cr+6 2 02-7 (aq) is reduced to cr+3 (aq)
& fe+2 (aq) is oxidized to fe+3 (aq)
Reducing takes place at cathode & oxidation takes place at anode.
The cell is represented by anode on the left hand side of electrolyte bridge & cathode on the right hand side of electrolyte bridge.
∴ It can be represented as :
Pt(s) ∣ fe 3 + (aq)fe2+ (aq) ∣∣ cr2 o2- 7(aq),cr+3 (aq) ∣ Pt(s)
The complete question is : The cell reaction cr2 O2(aq)+14H+aq)+ 6fe2+(aq)→ 6fe3+(aq)+ (aq)+7H2 O(l), is best represented by:
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The combustion of propane may be described by the chemical equation C₂H₂(g) +50,( 3 CO₂(g) + 4H₂O(g) How many grams of O₂(g) are needed to completely burn 20.9 g T, H, (g)? mass O₂: go2
Answers
so basically maybe you should
Which of the following is a reasonable electron configuration?
O1s²1p5
O1s²2s²2p8
O1s²2s²2d4
O1s²2s²2p6
Answers
Answer:
Explanation:The electronic configuration of Oxygen is 1 s 2 2 s 2 2 p 4 .
1s²2s²2p⁶ is a reasonable electron configuration. Therefore, the correct option is option D.
What is electron configuration?The arrangement of an atom's or molecule's (or other physical structure's) electrons in their atomic or molecular orbitals is known as the electron configuration in atomic physics or quantum chemistry. For instance, the neon atom's electron configuration is 1s2 2s2 2p6, which means that 1, 2 and 6 electrons, respectively, are present in each of the 1s, 2s, and 2p subshells.
According to electronic configurations, each electron moves individually within an orbital while being surrounded by an average field produced by all other orbitals. Slater determinants and configuration state functions are used to mathematically describe configurations. 1s²2s²2p⁶ is a reasonable electron configuration.
Therefore, the correct option is option D.
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NEED HELP ASAP PLEASE AND TY
Answers
The synthesis of the ATP takes place in the organelle known as the mitochondrion. Therefore, option (A) is correct.
What is mitochondrion?Mitochondrion can be described as the membrane-bound organelles in the cytoplasm of all eukaryotic cells, that synthesize adenosine triphosphate (ATP), the main energy source used by the cell.
It is also known as the “Powerhouse of the cell,” Mitochondrion is found inside the cytoplasm and essentially functions as the cell’s digestive system.
Mitochondrion plays a major role in breaking down nutrients and producing energy-rich molecules for the cell. Many of the biochemical reactions in cellular respiration occur within the mitochondria.
The mitochondrion's structure can be described as a double-membraned, rod-shaped structure found in both animal cells and plants.
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Hello, Please help asap. Due in like 10-20 mins. I would greatly appreciate it (INCLUDES PICTURE DOWN BELOW)
Answers
In the given diagram of photosynthesis:
1. Carbon dioxide CO₂
2. Glucose C₆H₁₂O₆
3. ATP
What is Photosynthesis?Photosynthesis can be described as a process by which phototrophs convert light into chemical energy. This chemical energy is stored in the form of sugars, which are generated from water and carbon dioxide.
Photosynthesis reaction involves carbon dioxide and water which yield two products oxygen and glucose. Therefore, the photosynthesis reaction is said to be an endothermic reaction.
[tex]6CO_2 + 6H_2O \longrightarrow C_6H_{12}O_6 + 6O_2[/tex]
Photosynthesis takes place when plants use light energy to transform carbon dioxide gas and water into glucose and oxygen gas. Each chloroplast in plants contains a green-colored pigment known as chlorophyll. Sunlight is absorbed by chlorophyll whereas carbon dioxide and oxygen enter via the tiny pores of the stomata of leaves.
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Which one is a spontaneous reaction?
Pd(s) + Be2+(aq) → Be(s) + Pd2+(aq)
3Sn(s) + 2Ga3+(aq) → 2Ga(s) + 3Sn2+(aq)
Be(s) + Sn2+(aq) → Sn(s) + Be2+(aq)
3Pd(s) +2Ga3+(aq) → 2Ga(s) + 3Pd2+(aq)
Answers
The spontaneous reaction among the given reactions is :
Be(s) + Sn²⁺ (aq) ---> Sn(s) + Be²⁺ (aq); option CWhat are spontaneous reactions?Spontaneous reactions are reactions that can proceed on their own without the addition of energy from an external source.
The free energy change of spontaneous reactions must be less than zero.
This implies that the energy change in a spontaneous reaction favors the formation of products and the reaction will proceed to product formation without an external source of energy supply.
Considering the given reactions:
The reaction that will be spontaneous is one that favors product formation.
Berylium is more reactive than Tin, hence, the reation below is spontaneous.
Be(s) + Sn²⁺ (aq) ---> Sn(s) + Be²⁺ (aq)
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Consider the following reaction:
2NiO(s)→2Ni(s)+O2(g)
If O2 is collected over water at 40.0 ∘C and a total pressure of 746 mmHg , what volume of gas will be collected for the complete reaction of 24.23 g of NiO ?
Answers
Ideal gas law is valid only for ideal gas not for vanderwaal gas. Therefore, the volume of gas will be collected for the complete reaction of 24.23 g of NiO is 4.19L.
What is ideal gas equation?Ideal gas equation is the mathematical expression that relates pressure volume and temperature. There is no force of attraction between the particles.
Mathematically the relation between Pressure, volume and temperature can be given as
PV=nRT
where,
P = pressure of gas sample
V= volume of gas sample
n =number of moles of gas sample
T =temperature of gas
R = Gas constant = 0.0821 L.atm/K.mol
Substituting all the given values, we get
Molar mass of NiO=74.6928g/mol
mass of NiO= 24.23 g
Number of moles of NiO =0.324
From reaction the molar ratio between NiO and O[tex]_2[/tex] is 2:1
Number of moles of O[tex]_2[/tex] =0.16moles
applying ideal gas equation
0.98atm×V =0.16× 0.0821×313
V =4.19L
Therefore, the volume of gas will be collected for the complete reaction of 24.23 g of NiO is 4.19L.
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This hydrocarbon is incomplete. Draw the hydrogen atoms and the bonds connecting them to carbon atoms such that each carbon atom has four bonds. Then record the number of hydrogen atoms you drew using a text box.
Answers
Answer:
no. of H = 10
no. of C = 4
C4H10
This hydrocarbon is incomplete. Draw the hydrogen atoms and the bonds connecting them to carbon atoms such that each carbon atom has four bonds. Then record the number of hydrogen atoms you drew using a text box.
Answers
Explanation:
no. of H atoms is 12..
no of C atoms is 5....
all the C atoms are sharing a bond with each other and so are H atoms...
Find the value of xx, yy, and zz, in the rhombus below. 40, x-5, 6y-2, 5z+5.
Answers
A rhombus is a quadrilateral with all the sides of equal measurements. Therefore, the value of x, y, and z are 45, 7, and 7, respectively.
What is a rhombus?A rhombus is a quadrilateral with all the four sides having equal measurements. The opposite sides are parallel to each other which gives it the shape of a kite.
The value of x, y, and z can be calculated as all the sides have equal value.
x - 5 = 6y -2 = 5z + 5 = 40
Therefore, on solving each equation separately we get.
x - 5 = 40
x = 40 + 5
x = 45
6y - 2 = 40
6y = 40 + 2
6y = 42
y = 42/ 6
y = 7
5z + 5 = 40
5z = 40 - 5
5z = 35
z = 35/ 5
z = 7
Therefore, the values of x, y, and z are 45, 7, and 7, respectively.
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What is the molar mass of an unknown gas with a density of 14.1 g/L at 4.00 atm and 35.0 °C?
Answers
89.08 g/mol is the molar mass of an unknown gas with a density of 14.1 g/L at 4.00 atm and 35.0 °C.
We know that
PV=nRT.
where,
P = Pressure of the gas
V = Volume of the gas
n = Mole
Mole = Given mass/Molar mass
= m /Mw
R = Real gas constant = .08205 L atm/mole k
T = temperature
Now,
PV = mRT/Mw
Mw= mRT/PV. ( m/V=density)
Mw = dRT/P
Mw = 14.1 g/L × 0.08205 × 308/4
Mw = 89.08 g/mol
Hence we can say that Molar mass is 89.08 g/mol.
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Knowing what you know about photosynthesis, explain how the process may help reduce global warming.
Answers
Photosynthesis may help reduce global warming because the carbon dioxide is consumed during the process.
How photosynthesis may help reduce global warmingGlobal warming has to do with an increase in the average global temperature brought about by the increase in the concentration of greenhouse gases in the atmosphere.
The greenhouse gases form a layer that traps reflected solar radiation in the atmosphere. They prevent these radiations from returning back to space and consequently, the temperature of the planet keeps increasing. The more the concentration of these gases in the atmosphere, the more the warming increases.
Carbon dioxide gas represents a major component of greenhouse gases and has been the main culprit in global warming.
During photosynthesis, carbon dioxide is utilized by green plants to make carbohydrates. Thus, photosynthesis remains a major way through which the concentration of carbon dioxide in the atmosphere can be reduced and consequently reduce global warming.
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Conservation of Mass
In the following reaction, H2 + F2 → 2HF, a student reacts 8g of H2 with 20g of F2. Assuming no mass is lost (due to the Law of Conservation of Mass), how many grams of HF is produced?
You can use the following Sentence Stem to formulate your answer.
Conservation of mass is mass _________ be _______ or _____________. In this reaction 8 _____ of ___________ + ____ grams of F2 produce ___ moles of ____________, the _____________. Since there is no _________ of ____________ due to the law of _________________ of ___________. There will be _____ grams of HF _______________.
Answers
The two main postulates that was given by Antoine Lavoisier are, oxygen play an important role in combustion and the other is mass of the reactant and product is conserved. Therefore the mass of HF is 28grams.
What is law of conservation of mass?According to Law of conservation of mass, mass can neither be created nor be destroyed. Mass can only be transformed from one form to another. The law of conservation of mass was given by Antoine Lavoisier. Every reaction in nature follow the law given by Antoine Lavoisier that is mass is always conserved.
H[tex]_2[/tex] + F[tex]_2[/tex] → 2HF
Mass of H[tex]_2[/tex]=8Grams
mass of F[tex]_2[/tex]= 20grams
According to law of conservation f mass
mass of H[tex]_2[/tex] + mass of F[tex]_2[/tex] = mass of HF
Substituting all the given values, we get
8grams + 20grams =mass of HF
mass of HF=28grams
Therefore the mass of HF is 28grams.
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Can there be a balance between lifestyle and green technology?
Answers
4. a type of civil engineering concerned with moving people and goods
Answers
How are latitude similar in their effects on climate
Please help me asap
Answers
Answer:
varying altitude and latitude create unequal heating of Earth's atmosphere
Explanation:
the higher you are, the colder it is(most of the time)
and latitude determines how close you are to the poles, the closer the cooler
__Sr(OH)2 + Al2 (SO4)3 —> __ SrSO4 +___ Al(OH)3
Answers
The balanced chemical equation is 3 Sr(OH)₂ + Al₂(SO₄)₃[tex]\rightarrow[/tex] 3 SrSO₄ + 2 Al(OH)₃.
What is chemical equation?Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.
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There are a number of factors that alter the bioavailability of minerals from foods. Complete each sentence with either increases or decreases.
decreases increases
Phytic acid ______ the absorption of zinc from grains.
Oxalic acid _____ the absorption of calcium from spinach.
Refinement of grains _____ the mineral content of grain products.
Vitamin C _____ the absorption of iron from foods.
Vitamin D ____ the absorption of calcium from foods.
Answers
Each sentence about the bioavailability of minerals in foods should be completed with either increases or decreases as follows:
Phytic acid decreases the absorption of zinc from grains.Oxalic acid decreases the absorption of calcium from spinach.Refinement of grains decreases the mineral content of grain products.Vitamin C increases the absorption of iron from foods.Vitamin D increases the absorption of calcium from foods.What are nutrients?Nutrients can be defined as the chemical compounds (substances) or minerals that are present in food, and they are needed by the body of a living organism for healthy growth, reproduction, development, proper functioning, and reproduction.
What are the classes of nutrients?In Science, there are five (5) main classes of nutrients and these include the following:
ProteinFatCarbohydrateVitaminsMineralsIn conclusion, phytic acid, oxalic acid, and refinement of grains are factors that decrease the bioavailability of minerals in foods while Vitamin C and Vitamin D increases the bioavailability of minerals in foods.
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Part A: Identify the oldest rock layer shown in the diagram. Be sure to explain your reasoning.
Part B: Scientists think that the trilobite fossil found only in layer d became extinct soon after layer d was formed. Using evidence from the cross-section, explain why this statement is true or not.
Answers
Answer: none
Explanation:none
In this chemical equation below 2 Mg + HCI are called the ?
2 Mg + HCI —> MgCl2 + H2
Answers
In this chemical equation below 2Mg + HCI are called the reactants. Therefore, option (4) is correct.
What is the chemical equation?A chemical equation can be defined as a representation of a chemical reaction with help of chemical symbols, and molecular formulae of the substances. A chemical equation exhibits reactants participating, formed products in the reaction, and an arrow shows the direction of the chemical reaction.
The chemical equation in which the number of atoms of each element on either side of the equation should be equal is called a balanced chemical equation.
A chemical equation obeys the law of conservation of mass. By obeying this law, in a balanced chemical equation, the total mass on the reactant side must be equal to total mass on the product side.
In the given chemical equation, Mg and HCl are reactants and MgCl₂and H₂ are products.
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Part 1: Name the type of chemical reaction that occurs when magnesium chloride solution (MgCl2) reacts with sodium carbonate solution (Na2CO3).
Part 2: Explain why aluminum (Al) would react with copper chloride (CuCl2) but not with magnesium chloride (MgCl2).
Answers
1. The name of the reaction is double displacement reaction
2. Aluminum (Al) will react with CuCl₂ but not with MgCl₂ because Mg is higher than Al in the electrochemical series
1. How do I know the type of reaction occurring?
To know the type of reaction occurring, we shall write the balanced equation for the reaction. Details below:
MgCl₂ + Na₂CO₃ -> 2NaCl + MgCO₃
From the balanced equation above, we can see clearly that there is an exchange of ions as Na and Mg exchanges and likes Cl₂ and CO₃.
Thus, we can conclude that the reaction is a double displacement reaction
2. Why will Al react with CuCl₂ but not with MgCl₂?
The reactivity of metals is controlled by their position in the electrochemical series.
Metals higher in the electrochemical series are more reactive and will displace the less reactive metals from solution.
The attached photo shows the electrochemical series of metals.
We can see that magnesium, Mg is higher than aluminum, Al in the electrochemical series and as such, Al can not displace Mg from solution.
Thus, we can conclude that Al can not react with MgCl₂ since Mg is higher than Al in electrochemical series.
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As astronauts take off in a rocket moving away from earth how does their mass and or weight change
Answers
Answer:
As you travel away from the Earth's surface, your mass stays the same but your weight reduces as gravitational pull decreases. For example, an astronaut orbiting the Earth and floating weightlessly in the cabin still has the same mass.
Explanation:
How many kilojoules are released when 2.60 mol of H2O2 reacts?
Answers
On the decomposition of 2.60 moles of hydrogen peroxide, 254.8 KJ energy will be released.
What is a decomposition reaction?A decomposition reaction can be defined as a reaction in which a chemical compound breaks down into two or more simple compounds. The general form to express a decomposition reaction is:
AB → A + B
Most decomposition reactions accept energy in the form of heat, radiation, or electricity. The decomposition reaction of hydrogen peroxide is shown below:
2H₂O₂(l) → 2H₂O (l) + O₂(g) ΔH = - 196 KJ/mol
2 moles of hydrogen peroxide decomposes energy released = 196 KJ
2.60 of H₂O₂ decomposes energy released = 196 ×2.60/2 = 254.8 KJ
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How many moles of nitrogen gas would be produced if 7.75 moles of copper(I) oxide were reacted with excess ammonia in the following chemical reaction? 2 NHs (g) + 3 CuO (s) > 3 Cu(s) + Na(g) + 3 H20 (g)
Answers
Answer:
Explanation:
Dimensional analysis, using mole ratio from the balanced reaction: (7.63 mole CuO) * (1 mole N2 /3 mole CuO) = 2.54 mole N2
The compound below can be prepared with an alkyl iodide and a suitable nucleophile. Identify the alkyl iodide and the nucleophile that you would use. For an anionic nucleophile, you do not need to draw the counterion.
The compound below can be prepared with an alkyl iodide and a suitable nucleophile. Identify the alkyl iodide and the nucleophile that you would use. For an anionic nucleophile, you do not need to draw the counterion.
Answers
Alcohol iodide nucleophile Is identified as the alkyl iodide and the nucleophile that would be used.
What is nucleophile?Nucleophile is defined as a chemical species that provides an electron pair to create a chemical bond in response to an action. A nucleophile typically has one electron pair and is negatively charged or neutral.
Alcohols with alkyl halides of hydrogen. Alcohols often undergo a nucleophilic substitution reaction to produce an alkyl halide and water when exposed to HBr or HCl. Alkanes and alcohols can be converted into alkyl halides through a nucleophilic substitution process.
Thus, alcohol iodide nucleophile Is identified as the alkyl iodide and the nucleophile that would be used.
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This compound ( 2,3-dimethyl-2-heptene ) is symmetric or asymmetric
Answers
Answer:
symmetric
Explanation:
The compound 2,3-dimethyl-2-heptene is symmetric. A compound is symmetric if it has an identical molecular structure on both sides of its central axis. In the case of 2,3-dimethyl-2-heptene, the molecule has a central carbon atom with two methyl groups attached to it, one on the 2nd position and one on the 3rd position. Because the groups attached to the central carbon atom are identical, the molecule is symmetric.
In contrast, an asymmetric compound has a molecular structure that is different on each side of its central axis. For example, a compound with a central carbon atom attached to two different groups, such as a methyl group and a hydrogen atom, would be asymmetric.