The description which explains how pollen is received is that the stigma at the top of the pistil receives pollen and is therefore denoted as option B.
What is Pollen?This is a powdery substance produced by seed plants and it consists of one or more vegetative cells and a reproductive cell. It is involved in the production of the male gametes in plants which makes it an importgant component in the ecosystem.
During pollination by different types of agents such as birds, wind etc the pollen are dispersed in various directions in which some get to the stigma at the top of the pistil which is the female reproductive part of the plant.
This therefore leads to fertilization and a fruit is formed as a result which is therefore the reason why option B was chosen as the correct answer.
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Peter ate junk food at breakfast and worried about the examination, which combined to give him an annoying case of acid indigestion. Suggest some ways of reducing the indigestion.
Answer:
Consumption of Antacid
Explanation:
At breakfast when Peter ate junk food , excess acid could have got released due to which he had got acidity in his stomach. By consumption of Antacid can reduce the effect of acidity because antacid is a mild base. When a mild base reacts with acid it neutralises the effect of acid & hence gives a relief from acidity...
draw the most stable form of the major product of the given ester upon exposure to excess naoch2ch3 in ch3ch2oh , followed by aqueous acidic workup.
The most stable form of the major product of an ester upon exposure to excess NaOCH2CH3 in CH3CH2OH, followed by aqueous acidic workup, will depend on the specific ester and the conditions used.
To draw the most stable form of the major product of the given ester upon exposure to excess NaOCH2CH3 in CH3CH2OH, followed by aqueous acidic workup, we first need to identify the ester.
When an ester is treated with excess NaOCH2CH3 in CH3CH2OH, the ester undergoes a base-catalyzed reaction known as transesterification. The alkoxide ion (OCH2CH3-) generated by the reaction acts as a nucleophile and attacks the carbonyl carbon of the ester, resulting in the formation of a tetrahedral intermediate. The tetrahedral intermediate then collapses, resulting in the formation of a new ester and an alcohol. This process can be repeated multiple times, resulting in the formation of a mixture of esters and alcohols.
To determine the most stable form of the major product, we need to consider the stability of the different products formed. Generally, the most stable product is the one with the most substituted alkene. This is because more substituted alkenes are more stable than less substituted alkenes due to hyperconjugation and steric hindrance effects. Additionally, the product with the largest alkyl group attached to the carbonyl carbon is generally more stable than the product with smaller alkyl groups due to steric hindrance.
After transesterification, the mixture of esters and alcohols is treated with aqueous acidic workup. This converts the alkoxide ion back into the alcohol, protonates the carbonyl oxygen of the ester, and hydrolyzes any remaining esters into carboxylic acids. The resulting mixture of carboxylic acids, alcohols, and esters can be separated by distillation or chromatography.
In summary, Factors that can influence the stability of the product include the degree of substitution of the alkene, the size of the alkyl groups attached to the carbonyl carbon, and the strength of the acid used for the aqueous acidic workup.
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What state had the fewest farms? Wisconsin Georgia Illinois
Explain what is going on at the molecular level as your liquid sample cools down and
solidifies.
Answer:
Freezing. When a liquid is cooled, the average energy of the molecules decreases. At some point, the amount of heat removed is great enough that the attractive forces between molecules draw the molecules close together, and the liquid freezes to a solid.
Note how temperature effects the motion of the atoms or molecules in a liquid. As the temperature of a solid, liquid or gas increases, the particles move more rapidly. As the temperature falls, the particles slow down. If a liquid is cooled sufficiently, it forms a solid.
I hope it helps you:)which balance should be used to .......
a. weigh approximately 10g of NaCl
b. weigh 10.1 g of NaCl
The analytical balance should be used to weigh approximately 10g of NaCl and weigh 10.1 g of NaCl.
Use an analytical balance to weigh approximately 10 g of NaCl. A form of balance known as an analytical balance is able to precisely measure very small amounts of mass, typically to the nearest 0.1 mg. This accuracy is required to weigh an object with a relatively modest mass like sodium chloride to within 10 g.
You should still need an analytical balance to weigh 10.1 g of NaCl because a conventional laboratory balance might not have the precision needed to measure such a minute difference in mass. You can quantify the sodium chloride's exact mass to within 0.1 mg using an analytical balance.
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1. calculate the ph of the aqueous solution that is the mixture of 0.10 m nano2 and 0.20 m ca(no2)2. ka for hno2 is 4.5*10-4.
The pH of the aqueous solution that is the mixture of 0.10 M NaNO₂ and 0.20 M Ca(NO₂)₂ is 2.52.
To calculate the pH of the given aqueous solution, we need to first determine the concentration of HNO₂ in the solution. HNO₂ is a weak acid, and its Ka value is given as 4.5 x 10⁻⁴. We can write the dissociation reaction of HNO₂ as:
HNO₂ + H₂O ⇌ H₃O⁺ + NO₂⁻
The equilibrium constant expression for this reaction can be written as:
Ka = [H₃O⁺][NO₂⁻] / [HNO₂]
Assuming that the initial concentration of HNO₂ is negligible compared to the equilibrium concentration, we can simplify the expression as:
Ka = [H₃O⁺]² / [HNO₂]
Solving for [H₃O⁺], we get:
[H₃O⁺] = √(Ka * [HNO₂]) = √(4.5 *10⁻⁴ * 0.10) = 0.015
Now, we can use the concentration of Ca(NO₂)₂ to calculate the concentration of NO₂⁻ in the solution. Ca(NO₂)₂ dissociates into Ca²⁺ and 2NO₂⁻. Since NO₂⁻ is the conjugate base of HNO₂, it can react with H₃O⁺ to form HNO₂ and H₂O. This reaction can be written as:
NO₂⁻ + H₃O⁺ ⇌ HNO₂ + H₂O
The equilibrium constant expression for this reaction can be written as:
Kb = [HNO₂][H₂O] / [NO₂⁻][H₃O⁺]
Since Kb for NO₂⁻ is related to Ka for HNO₂ as:
Ka x Kb = Kw = 1.0 * 10⁻¹⁴
We can use this relation to calculate Kb for NO₂⁻ as:
Kb = Kw / Ka = 1.0 x 10⁻¹⁴ / 4.5 x 10⁻⁴ = 2.22 x 10⁻¹¹
Assuming that the initial concentration of NO₂⁻ is negligible compared to the equilibrium concentration, we can simplify the expression for Kb as:
Kb = [HNO₂][H₂O] / [NO₂⁻]
Solving for [HNO₂], we get:
[HNO₂] = Kb * [NO₂⁻] / [H₂O] = 2.22 * 10⁻¹¹ * (2 * 0.20) / 55.5 = 1.59 * 10⁻¹²
Now, we can use the concentrations of HNO₂ and NO₂⁻ to calculate the pH of the solution using the equation:
pH = -log[H₃O⁺] = -log(√(Ka x [HNO₂] / [NO₂⁻])) = -log(√(4.5 x 10⁻⁴ x 0.10 / (2 x 0.20))) = 2.52
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How much voltage is required to run 1.6 A of current through a 240
resistor? Use AV = IR.
O A. 380 V
O B. 6.7 x 10-3 v
O C. 150 V
O D. 2.6 x 10-3 v
Answer:
answer is not there
Explanation:
V=1.6×240
V=384volt
what is the difference between basis and basic
Answer:
Basis and basic are two different words.
In English, Basis is used as a noun while basic is used as an adjective. Basis term refers as the base or starting point of any discussion.
For example: Bread is a basic ingredient of cake.
On the basis of Mendel's hypothesis.
In chemistry, Basis set is used as a set of functions that represent the electronic wave function in the density-functional theory which forms an algebraic equations that can be easily implemented on a computer.
While Basic term is used for substances that can accept a hydrogen ion (H+) from another substance and have pH above 7. such as sodium.
So, It is not important that both the terms, basis and basic change their English meaning if used in chemistry, they both can be used with English meaning in chemistry as well. Bases and basic, both the terms can be used as either English or Chemistry without affecting the meaning.
What is a niche? (Select all that apply.)
A. It is the primary and secondary consumer.
B. It is the number of organisms within the ecosystem.
C. It is the food an organism eats.
D. It is how the organism lives.
E .It is where the organism lives.
PLEASE HURRY!!
Answer: I'm pretty sure it's D
Explanation :I hope
Given 15.0 g of magnesium chloride and 25.0 mL of 1.5 moles of AgNO3 what mass of AgCl will be produced
Would sweet tea be an example of a mixture or a compound?
Sweet tea is an example of a mixture. A mixture is defined as a combination of two or more substances in which the individual components are generally still distinguishable and can be separated by physical means.
On the other hand, a compound is a substance made up of two or more different elements chemically combined in fixed proportions.Sweet tea is usually composed of tea leaves, sugar, and water. The individual components are still distinguishable and can be separated by physical means such as filtration and evaporation. For example, if sweet tea is left to stand, the tea leaves will settle to the bottom and the sugar will dissolve in the water. Therefore, sweet tea is an example of a mixture and not a compound.
In conclusion, sweet tea is an example of a mixture and not a compound because the individual components are still distinguishable and can be separated by physical means. It is composed of tea leaves, sugar, and water, which are combined to create a unique flavor and taste.
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Determine the major organic product(s) of the following reaction. Include appropriate stereochemistry in answer. Be sure to consider which mechanism would dominate (SN1, SN2, E1, or E2) when predicting the product.
The major organic product of the given reaction would depend on the mechanism that dominates, either SN1, SN2, E1, or E2.To determine the major organic product, we need to consider the mechanism that would dominate in the given reaction.
SN1 mechanism: If the reaction proceeds through the SN1 mechanism, the major product would be the carbocation intermediate, followed by the nucleophilic attack. The stereochemistry would depend on the attack of the nucleophile, and it may result in the formation of both retention and inversion products.
SN2 mechanism: If the reaction proceeds through the SN2 mechanism, the major product would be the direct substitution of the leaving group by the nucleophile. The stereochemistry of the product would be inverted, as the nucleophile attacks from the opposite side of the leaving group.
E1 mechanism: If the reaction proceeds through the E1 mechanism, the major product would be the elimination of the leaving group to form a double bond. The stereochemistry would depend on the orientation of the leaving group and the hydrogen atoms involved in the elimination.
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in the equation 3x-3=18 what is x?
Answer:
x=7
Explanation:
3x-3=18
-3 moves over the 18 side and becomes +3.
18 + 3 =21
3x=21
now you need to divide 3 with 21 giving you 7
Answer:
The answer is seven bc X is seven.
nitrogen gas reacts with oxygen gas to produce nitrogen dioxide gas
Answer:
answer is nitrogen dioxide
britnell, l. e. a. strong light-matter interactions in heterostructures of atomically thin films. science 340, 4 (2013).
The citation you provided is from a scientific paper titled "Strong Light-Matter Interactions in Heterostructures of Atomically Thin Films" by L.E.A. Britnell, published in the journal Science in 2013. This paper discusses the concept of strong light-matter interactions in heterostructures of atomically thin films. Let me break it down for you:
The paper explores the properties and behavior of these atomically thin films when they are subjected to strong light-matter interactions within heterostructures. It likely discusses experimental methods, theoretical models, and results obtained from studying these interactions.
While I don't have access to the specific content of the paper, the citation you provided suggests that it may be a valuable resource for understanding the topic of strong light-matter interactions in atomically thin film heterostructures. It is worth noting that reading the paper itself would provide a more in-depth understanding of the subject matter.
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Why is copper a good conductor of electricity?
A.
Copper atoms hold onto their electrons very tightly.
B.
Electrons can move easily between copper atoms.
C.
Copper atoms are bonded together in molecules.
D.
Copper atoms can flow quickly along a wire.
Answer:
B. Electrons can move easily between copper atoms.
Explanation:
The label on a container of margarine lists hydrogenated vegetable oil as the major ingredient. What is the result of adding hydrogens to vegetable oil?.
When hydrogen is added to vegetable oil, it undergoes a process called hydrogenation which turns it into a solid state and increases its melting point. The addition of hydrogen atoms to the double bonds of vegetable oil changes the physical properties of the oil and produces hydrogenated vegetable oil.
Hydrogenation is a chemical process that takes an unsaturated fat and adds hydrogen to it in order to make it more solid and increase its shelf life. When vegetable oil undergoes this process, the result is hydrogenated vegetable oil. This is often used as an ingredient in margarine, as well as other food products that require a longer shelf life and a solid form. Hydrogenated vegetable oil is typically used as a replacement for butter in baking, as well as a frying oil for deep-frying food items. While hydrogenation helps to increase the shelf life of vegetable oil, it also produces trans fats, which are considered unhealthy when consumed in large quantities. As a result, there has been a shift towards using alternative ingredients, such as palm oil, in place of hydrogenated vegetable oil.
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Select the correct answer. Clive finds that the water coming out of the faucet is a little muddy. He concludes that the color in the water is due to the mining activity in the nearby forest. Clive shares his conclusion with his science class. His classmates question his conclusion, but Clive has no data to back up his conclusion. Which step in the scientific investigation did he miss? A. observing B. communicating results C. testing the hypothesis D. creating a hypothesis
Answer:
A. observing
Explanation:
There are various steps that are involved in a scientific investigation. Observation is the first step of the scientific investigation. In this step, a close examination is laid on the investigation. Observation is collected with the senses and the information is gathered.
In the given excerpt, Clive missed the observation part of the scientific investigation. All the other three steps were followed by Clive. He was not able to observe the situation and so was not able to provide the answers to the questions asked by his classmates.
A substance with a high activation energy is expected to have a _____ reaction rate.
Answer:
A substance with a high activation energy is expected to have a slow reaction rate.
Since we know that the activation energy of a particular reaction determines the rate at which it will proceed. The higher the activation energy, the slower the chemical reaction will be.
Hence, a substance with a high activation energy is expected to have a slow reaction rate.
a book (m = 2 kg) is raised to a height of 1.5 m above the ground. Calculate the gravitational potential energy of the book.
Answer:
\(\boxed {\boxed {\sf 29.4 \ Joules }}\)
Explanation:
Gravitational potential energy can be found using the following formula.
\(PE_g= m*g*h\)
When m is the mass, g is the gravitational acceleration, and h is the height.
The book has a mass of 2 kilograms. It's height is 1.5 meters above the ground. Assuming this is on Earth, the gravitational acceleration is 9.8 m/s².
\(m= 2 \ kg \\h= 1.5 \ m \\g= 9.8 \ m/s^2\)
Substitute the values into the formula.
\(PE_g=2 \ kg * 1.5 \ m * 9.8 \ m/s^2\)
Multiply the first two numbers together.
\(PE_g=(3.0 \ kg*m)( 9.8 \ m/s^2)\)
Multiply again.
\(PE_g=29.4 \ kg*m^2/s^2\)
1 kilogram square meter per square second is equal to 1 Joule The answer we calculated is equal to 29.4 J\(PE_g= 29.4 \ J\)
The gravitational potential energy of the book is 29.4 Joules.
which of these four elements is the most reactive metal?
Answer:
Na
Explanation:
Answer:
It is Rb!!
for plato users
POSSIB
A student drops three balls of identical size but different masses from a height of one meter high into a container of sand.
The first ball has a mass of one gram.
The second ball has a mass of three grams.
The third ball has a mass of five grams.
Which ball will make the biggest crater in the sand and why?
(1 point for correct answer, 1 point for correct reason why)
B I
1
0/1
9 10 11 12 13 14 15
The third ball of 5 grams of mass will make the biggest crater in the sand because force is directly proportional to mass. so the greeter the mass, the greater its force and impact.
what is mass?Mass is described as the quantity of matter in a physical body.
Mass is also a measure of the body's inertia, the resistance to acceleration when a net force is applied.
Mass is always known to be constant for a body. We can calculate mass by:
Mass = volume × density.
Weight is the measure of the gravitational force acting on a mass. The SI unit of mass is the "kilogram"
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please help!! A solid has a melting point if 1710 C is soluble in water, and does not conduct electricity in the solid state. What is the most likely nature of the binding in this solid?
A) Molecular covalent B) Network Covalent C) Ionic D) Metallic
Answer:
d metallic
Explanation:
Does an electron cause an electromagnetic wave to vibrate
Yes, an electron cause an electromagnetic wave to vibrate.
What is an electromagnetic wave?One of the waves is propagated by simultaneous periodic variations of electric and magnetic field intensity and that includes radio waves, infrared, visible light, ultraviolet, X-rays, and gamma rays.
Electromagnetic waves are produced when something vibrates—an electric charge that moves back and forth.
When an electric charge vibrates, the electric field around it changes. Because the electric charge is in motion, it also has a magnetic field around it.
This magnetic field also changes as the charge vibrates.
Therefore, an electron causes an electromagnetic wave to vibrate.
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If a solid is placed in a liquid and lots of bubbles are formed, is this a physical change
Answer:
The formation of gas bubbles is often the result of a chemical change.
the solution of ash of magnisium ribbon is ____
Answer:
Alkaline
Explanation:
The solution of ash of magnesium ribbon is alkaline.
Which pure substance can be classified as an element?
H2
NO3
NaCl
H2SO4
Answer:
H2
Explanation:
on edge
What special label do you have to use when naming ionic compounds with transition metals?
A) Roman Numerals
B) Greek Numerals
Naming Ionic compounds with transition metals requires the use of a roman numeral. The charge of the metal ion must be written in the name of the compound with a roman numeral. This is because transition metals can have more than one valence (or charge).
which lead monitors an electrode at the 4th intercostal space on the right side of the sternum?
The lead that monitors an electrode at the 4th intercostal space on the right side of the sternum is the \(V_1\) lead.
It is a precordial chest lead used in electrocardiography (ECG) to record the electrical activity of the heart from the perspective of the anterior chest wall. The \(V_1\) lead is typically placed in the 4th intercostal space just to the right of the sternum.
It records the electrical activity of the heart in the same direction as lead \(V_2\), which is placed in the 4th intercostal space just to the left of the sternum. Together, leads \(V_1\)and\(V_2\) provide a view of the heart's electrical activity from the anterior perspective.
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amino acids are the building blocks of which class of macromoleculces
Answer:
proteins
Explanation:
amino acids are the monomers that make up proteins. amino acids bond together to form dipeptides, polypeptide chains, and eventually proteins.