Answers
Answer:
From my side the correct option is "A"
Explanation: Reasons for its correction are ,
1) Highly reactive: Nanoparticles are therefore extremely unstable and easily change themselves or react with active substances to reach a relatively stable state in some cases. This causes desired changes or undesired changes to nanoparticles and thus makes them exhibit a high reactivity and a poor stability.
2)Small size: Nanotechnology can provide rapid and sensitive detection of cancer-related molecules, enabling scientists to detect molecular changes even when they occur only in a small percentage of cells. Nanotechnology also has the potential to generate entirely novel and highly effective therapeutic agents.
Related Questions
In a chemical reaction where an electron is exchanged from one reactant to another, the structure that loses an electron is?
Answers
Answer:
Oxidized
Explanation:
Oxidation and reduction are terms used to describe reactions in which electrons move from one atom or molecule to another atom or molecule. Oxidation occurs when electrons are lost, while reduction occurs when electrons are gained. (The charge is reduced). The two processes are linked, whenever one substance is oxidized another has to be reduced.
The list below includes some of the properties of butane, a common fuel. Identify the chemical properties in the list. Check all of the boxes that apply.
denser than water
burns readily in air
boiling point of –1.1°C
odorless
does not react with water
Answers
Answer:
Answer above is incorrect
Explanation:
The true answers are B and E on Edge 2020
Hope this helps :)
Answer:
B and E
Explanation:
on edge hope this helps
What type of rock is made of dead plant/animal material?
Answers
Answer:
Sedimentary rocks
Explanation:
Sedimentary rocks are made of bits and pieces of rocks that have been eroded away, shells, and the remains of dead plants and animals. As larger rocks are exposed to the elements on Earth such as rain, wind, freezing, thawing, and plant roots growing, they are slowly worn away.
Maleic acid is a diprotic acid with ionization constants a1=1. 20×10−2 and a2=5. 37×10−7. Calculate the pH of a 0. 296 M potassium hydrogen maleate ( KHM ) solution
Answers
The pH of a 0.296 M potassium hydrogen maleate (KHM) solution is 2.34. This calculation is based on the ionization constants of maleic acid (a diprotic acid) and the concentration of the KHM solution.
The pH of a solution is a measure of its acidity or basicity, and is defined as the negative base-10 logarithm of the concentration of hydrogen ions (H+) in the solution. To calculate the pH of a KHM solution, we first need to consider the ionization of maleic acid.
Maleic acid is a diprotic acid, which means it can donate two hydrogen ions to a solution. The first ionization constant (a1) of maleic acid is 1.20x10^-2, which means that it partially ionizes in water to release H+. The second ionization constant (a2) is much smaller, at 5.37x10^-7, meaning it only partially ionizes a second time.
The KHM solution contains maleic acid, as well as its potassium salt, so we need to consider both species when calculating the pH. Using the ionization constants and concentration of KHM, we can calculate the concentration of H+ in the solution and convert it to pH.
The final pH value of 2.34 indicates that the KHM solution is acidic, with a relatively high concentration of H+.
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How many elements are in this chemical formula?
2(NH4)2SO4
Answers
Answer: 30
Explanation:
Sulfur S 1
Oxygen O 4
Nitrogen N 2
Hydrogen H 8
15 in total. For 2 moles, 15*2 = 30
Calculate the mass of ammonium sulfide (nh4)2s in 3.00 l of a 0.0200 m solution. g (nh4)2s
Answers
Taking into account the definition of molarity, 4.08 grams of ammonium sulfide are present in 3.00 L of a 0.0200 M solution.
Definition of molarityMolar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.
The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:
\(Molarity=\frac{number of moles}{volume}\)
Molarity is expressed in units \(\frac{moles}{liter}\).
Mass of ammonium sulfideIn this case, you know:
Molarity: 0.0200 Mnumber of moles: ?volume: 3 LReplacing in the definition of molarity:
\(0.0200 \frac{moles}{liter}=\frac{number of moles}{3 L}\)
Solving:
0.0200 \(\frac{moles}{liter}\)× 3 L= number of moles
0.06 moles= number of moles
On the other side, the molar mass is the amount of mass that a substance contains in one mole. In this case, the molar mass of ammonium sulfide is 68 g/mole.
Then, the amount of mass contained in 0.06 moles is calculated as:
0.06 moles×\(\frac{68 grams}{1 mole}\)= 4.08 grams
Finally, 4.08 grams of ammonium sulfide are present in 3.00 L of a 0.0200 M solution.
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Answer:
4.09 is the correct answer.
the chemical equation above demonstrates that--question 4 options:the atoms on the reactants side are changed into different atoms on the products sidethe reactants are the same substances as the productsmatter cannot be created or destroyed by a chemical reactionthe number of molecules in the reactants if equal to the number of molecules in the products
Answers
A substance that changes in a chemical reaction and is represented by the reaction arrow on the left side of a chemical equation.
A substance formed in a chemical equation. and written on the right side of the reaction arrow in a chemical equation is referred to as a product. According to the law of conservation of matter, matter cannot be created or destroyed. The number of atoms of each element in the reactants must be the same as the number of atoms of each element in the products in chemical equations. The atoms and molecules that interact in a chemical reaction are referred to as reactants. The atoms and molecules produced by a chemical reaction are referred to as products.
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A scientist provides 454 kJ of energy to a covalent compound in order to start a reaction. As a result, heat is released. Which statement is true about this experiment?
The amount of energy produced is more than 454 kJ.
The amount of energy produced is equal to 454 kJ.
The amount of energy produced is less than 454 kJ.
The amount of energy produced is at least double that of 454 kJ.
Answers
Answer:
The amount of energy produced is less than 454 kJ.
Explanation:
I do not know but if am wrong you can correct me. I need your help for business, english and chemistry questions on my profile. So can you and the other person who commented and go on my profile please...? the due date already gone 12 days ago.
Precipitate-forming reactions would be most appropriate for identifying the presence of?
Answers
Precipitate-forming reactions would be most appropriate for identifying the presence of whether an element is present in the solution.
What is precipitate forming reaction?In a precipitation reaction, dissolved chemicals will get combined to form one or more solid products. These kinds of reactions, which are also known as double displacement, double replacement, or metathesis reactions which are frequently taken place through the aqueous solutions and involved in the exchange of ions between ionic compounds.
Through the precipitation reactions, the presence of element will be confirmed and analyzed. The presence of lead in water sources could be checked by adding the chemical and looking for the appearance of a precipitation whether it should be at instant , and the chemical combines with lead to generate a precipitate.
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In the Bohr model, ____ electrons fill the first energy level, ____ electrons fill the second energy level, and ___ electrons fill the third energy level.
A) 1, 2, 3
B) 2, 8, 8
C) 8, 8, 8
D) 2, 8, 18
Answers
In which direction does the equilibrium of this reaction shift due to warming?
CO(g)+2 H 2 (g) rightleftharpoons C*H_{3}*OH(g)
Delta H^ * = - 90.2kJ / m * ol
O no shift in the equilibrium
O towards the reactants
O towards the products
Answers
The equilibrium of this reaction shifts towards the reactants due to warming.
This is because the reaction is exothermic, meaning that it releases heat. When the temperature is increased, the reaction will shift in the direction that absorbs heat, which is towards the reactants. This is in accordance with Le Chatelier's principle, which states that a system at equilibrium will shift in a direction that counteracts any changes imposed on it.
In this case, the change imposed on the system is an increase in temperature, and the system counteracts this change by shifting towards the reactants, which absorb heat. This shift in equilibrium will result in a decrease in the concentration of the products and an increase in the concentration of the reactants.
Therefore, the correct answer is:
O towards the reactants
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all waves, except electromagnetic waves, need a medium to travel through. what is a "medium"? give 2 examples
Answers
Answer:
air water
Explanation:
Mediums that can have waves
4-How does the concentration of ions in a strong acid differ from a weak acid?
Answers
show that the following language is decidable: {〈g〉 : g is a cfg and there exists a string that is in l(g) and has at least one a terminal} hint: modify the algorithm for ecfg
Answers
The language is decidable.
{〈g〉 : g is a CFG and there exists a string that is in L(G) and has at least one a terminal}.
algorithm to decide the language:
Given: Language is
{〈g〉 : g is a CFG and there exists a string that is in L(G) and has at least one a terminal}.
We need to show that the language is decidable. Let L be a context-free language generated by a CFG
G = (V, T, P, S).
We have to decide whether there exists at least one string in L which contains at least one 'a' terminal. Let S1 be a new start symbol with a production rule of the form S1 → S. We can add a new terminal symbol 'b' which is not present in the original grammar. We can also add new production rules as follows:
S1 → S|bS → a|b|Sa|SS|AS|BBSS → a|b|Sa|SS|AS|BBAS → a|b|Sa|SS|AS|BBBB → a|b|Sa|SS|AS|BB|ε
The following is the algorithm to decide the language.
1. Input: Context-free grammar G.
2. Construct a new grammar G' from G using the above production rules.
3. Construct the CYK table for all strings of length 1 to n, where n is the length of the longest string in the grammar.
4. If there exists a cell in the CYK table such that it contains S1 and a terminal 'a', then the language generated by G contains at least one string which has at least one 'a' terminal. Otherwise, the language generated by G does not contain any string which has at least one 'a' terminal.
5. Halt.
The language is decidable.
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Театр PH 2+ Salinity PC2 Phosphate Am -2+ 0 PC1 Fig. 3. Principal Components Analysis (PCA) Plot Based On Normalized Environmen- Tal Parameters And Nutrient Measurements In The Sampling Sites; The Mariculture Centre) And The Marina (V). The Marina. The Mean Concentrations Of Ammonia And Phosphate Were 0.55 And 0.18 In The Mariculture Centre Compared To 0.17
Answers
Principal Components Analysis (PCA) is an exploratory method that uses measurements to summarize the data and reveal the underlying structure of the variables.
Principal Components Analysis involves the reduction of complex data sets with many variables to a smaller number of linear combinations of the original variables known as principal components. PCA is used to identify patterns in data by determining the correlation between variables and simplifying data for ease of interpretation.
The plot shows the correlation between different variables in the sampling sites, which include the mariculture centre and the marina. The plot shows that the variables are highly correlated with each other, and they can be summarized by the first two principal components.
The plot shows that the mariculture centre has higher mean concentrations of ammonia and phosphate than the marina.
The mean concentrations of ammonia and phosphate were 0.55 and 0.18 in the mariculture centre compared to 0.17 in the marina. This suggests that the mariculture centre has higher nutrient levels than the marina.
In conclusion, principal components analysis (PCA) is a useful tool for summarizing complex data sets and identifying patterns in data. The PCA plot shows the correlation between different variables in the sampling sites, and it reveals that the mariculture centre has higher nutrient levels than the marina.
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Which is an example of a physical change?
gasoline combusting
cake baking
salt dissolving
iron rusting
Answers
Answer:
salt dissolving
Explanation:
Hope this helps!
Which of the following has the highest boiling point?
Select the correct answer below:
a.CH4
b. C7H16
c. C3H8
d. C8H18
(As the molar mass increases, the strength of the London dispersion forces between the molecules also increases, which results in an increase in boiling point. C8H18 has the highest molar mass, therefore, it has the highest boiling point.)
Answers
\(C_{8} H_{18}\) has the highest boiling point
Define boiling point.
When a substance changes from a liquid to a gas, that temperature is known as its boiling point. The liquid's vapor pressure has now reached equilibrium with the pressure being exerted on it.
Intermolecular forces inside a molecule play a significant role on boiling point. Higher boiling temperatures are associated with molecules that have stronger intermolecular forces, greater weights, and less branching.
As the molar mass increases, the strength of the London dispersion forces between the molecules also increases, which results in an increase in boiling point. \(C_{8} H_{18}\)has the highest molar mass, therefore, it has the highest boiling point.
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How many moles are present in 2.60x10^27 atoms of boron (B)?
Answers
Answer:
The answer is
4318.94 molesExplanation:
To find the number of moles of a substance given it's number of entities we use the formula
\(n = \frac{N}{L} \\ \)
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question
N = 2.60x10^27 atoms of boron
The number of moles is
\(n = \frac{2.60 \times {10}^{27} }{6.02 \times {10}^{23} } \\ = 4318.93687...\)
We have the final answer as
4318.94 molesHope this helps you
This is the Image for my question
Answers
Answer:
uhm
Explanation:
When energy changes from one form to another, it is called energy
A.radiations
B.transmissions
C.solutions
D.transformations
Answers
Answer:
(see below)
Explanation:
Using the process of elimination:
It's not energy radiations because radiation is a way energy is transferred.
It's not energy transmissions because that's the transfer of energy from one medium to another, like the sun to a black construction paper through radiation. There are three ways of transmission: radiation, convection, and conduction.
It's not solutions because a solution is a homogenous mixture where it is uniform in composition and appearance throughout. Also, the term "energy solutions" makes no sense whatsoever.
It's most likely energy transformations because energy transformation, also called energy conversion, is the process of changing energy from one form to another.
are the bonds of OCl2 polar?
Answers
Answer: OCl2 is polar because the two O-Cl bond dipoles don't cancel each other.
Please discuss the following items in your introduction:
• Law of Conservation of Mass (with example using an equation)
• Reactants/ products
• Word equations/ skeleton/ balanced chemical equations
Answers
Law of conservation of mass states that in a closed system, the mass would be the same.
In a reaction, the compounds’ undergoing reaction is called reactants and the resultant of the reaction is called products.
Word equation uses words instead of chemical formulas. The skeleton equations use chemical formulas without mentioning the state of the compounds or the concentration. In balanced chemical reaction, mass and charge would be balanced.
Law of conservation of mass is similar to law of conservation of energy. It says that in a closed system, the mass would remain the same as mass is neither created nor destroyed.
\(H_{2}O\) → \(H_{2} + O_{2}\)
In this reaction, \(H_{2}O\) is the reactant which has a mass of 18. H₂ and O₂ are the products with mass of 2 and 16 respectively.
In word equations, equation 1 can be written as
Water → Hydrogen + Water
In skeleton equation,
H₂0 → H₂ + O₂
In balanced chemical reaction,
2 H₂0 → 2 H₂ + O₂
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All of the following are anthropogenic greenhouse gases except Group of answer choices a. carbon dioxide. b. molecular oxygen. c. chlorofluorocarbons (CFCs). d. methane.
Answers
Answer:
c
Explanation:
its not a plant based gas
describe what is the energy transferred from a battery powered motor
Answers
Answer:
The battery is a store of internal energy (shown as chemical energy). The energy is transferred through the wires to the lamp, which then transfers the energy to the surroundings as light. These are the useful energy transfers - we use electric lamps to light up our rooms.
Explanation:
how many grams will be needed
Answers
If 4.46 grams of sodium hydroxide reactions with aluminum. How
many grams of aluminum hydroxide was produced?
Answers
The mass (in grams) of aluminum hydroxide produced when 4.46 g of sodium hydroxide reacts is 2.90 grams
How do I determine the mass of aluminum hdroxide produced?First, we shall obtain the balanced equation for the reaction. This is given below
3NaOH + Al → 3Na + Al(OH)₃
Molar mass of NaOH = 40 g/molMass of NaOH from the balanced equation = 3 × 40 = 120 g Molar mass of Al(OH)₃ = 78 g/molMass of Al(OH)₃ from the balanced equation = 1 × 78 = 78 gFrom the balanced equation above,
120 g of NaOH reacted to produce 78 g Al(OH)₃
With the above information, we shall determine the mass of Al(OH)₃ produced from 4.46 grams of NaOH. Details below:
From the balanced equation above,
120 g of NaOH reacted to produce 78 g Al(OH)₃
Therefore,
4.46 g of NaOH will react to produce = (4.46 × 78) / 120 = 2.90 g of Al(OH)₃
Thus, the mass of aluminum hydroxide, Al(OH)₃ produced is 2.90 g
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Use the formula to answer the following question4Li + Pb(SO4)2->2Li₂SO4 + PbHow many moles of Pb(SO4)2 are needed to produce 330 g Li₂SO4?
Answers
ANSWER
The number of moles of Pb(SO4)2 is 1.5 moles
EXPLANATION
Given that;
The mass of Li2SO4 is 330g
Follow the steps below to find the moles of Pb(SO4)2
Step 1; Write the balanced equation of the reaction
\(\text{ 4Li + Pb\lparen SO}_4)_2\rightarrow\text{ 2Li}_2SO_4\text{ + Pb}\)Step 2; Find the number of moles of Li2SO4 using the below formula
\(\text{ Mole = }\frac{\text{ mass}}{\text{ molar mass}}\)Recall, that the molar mass of Li2SO4 is 109.94 g/mol
\(\begin{gathered} \text{ mole = }\frac{\text{ 330}}{\text{ 109.94}} \\ \text{ mole = 3.00 moles} \end{gathered}\)The number of moles of Li2SO4 is 3.00 moles
Step 3; Find the number of moles of Pb(SO4)2 using a stoichiometry ratio
In the above equation of the reaction, 1 mole Pb(SO4)2 reacts to give 2 moles LiSO4
Let the number of moles of Pb(SO4) be x
\(\begin{gathered} \text{ 1 mole Pb\lparen SO}_4)_2\text{ }\rightarrow\text{ 2 moles Li}_2\text{SO}_4 \\ \text{ x moles Pb\lparen SO}_4)_2\text{ }\rightarrow\text{ 3.00 moles Li}_2SO_4 \\ \text{ Cross multiply} \\ \text{ 1 mole Pb\lparen SO}_4)_2\text{ }\times\text{ 3 .00 moles Li}_2SO_4\text{ = 2 moles Li}_2SO_4\text{ }\times\text{ x moles Pb\lparen SO}_4)_2 \\ \text{ Isolate x} \\ \text{ x = }\frac{\text{ 1 mole Pb\lparen SO}_4)_2\times3moles\cancel{Li_2}SO_4}{2moles\cancel{Li_2}SO_4} \\ \text{ x = }\frac{1\text{ }\times\text{ 3}}{2} \\ \text{ x = }\frac{3}{2} \\ \text{ x = 1.5 moles} \end{gathered}\)Therefore, the number of moles of Pb(SO4)2 is 1.5 moles
Is water a substance or a thing?
Answers
water is a pure substance
Write complete reaction mechanisms for formation of 1-bromobutane and also show how 1-butene and di-n-butyl ether are formed. 2. Why is it necessary to remove water before weighing the 1-bromobutane
Answers
The formation of 1-bromobutane involves the following reaction mechanism: 1. Nucleophilic substitution (SN2): Butanol reacts with a bromide ion (Br-) to form 1-bromobutane and a hydroxide ion (OH-). Butanol + Br- → 1-bromobutane + OH-
The formation of 1-butene and di-n-butyl ether are side reactions in this process:
1. Elimination (E2) reaction: Butanol undergoes an elimination reaction to form 1-butene and water.
Butanol → 1-butene + H2O
2. Williamson ether synthesis: Two butanol molecules react with each other in the presence of a base, forming di-n-butyl ether and water.
2 Butanol + Base → di-n-butyl ether + H2O + Base
It's necessary to remove water before weighing the 1-bromobutane because water could alter the measured weight, leading to inaccurate results. Water can also promote side reactions like the formation of di-n-butyl ether, which could further impact the yield and purity of the desired product, 1-bromobutane.
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You are given four different radioactive samples. Rank the samples in order of what fraction of the original nuclei remains after 1 hour (1 h
Answers
The four radioactive samples can be ranked in order of what fraction of the original nuclei remains after 1 hour as follows: Sample A > Sample B > Sample C > Sample D.
The rate of radioactive decay is governed by the half-life of the radioactive material. The half-life is the time it takes for half of the radioactive nuclei in a sample to decay. Based on the given information, we can infer that the samples have different half-lives.
Sample A would have the highest fraction of remaining nuclei after 1 hour because it has the longest half-life. This means that a smaller proportion of the nuclei in Sample A would have decayed during the 1-hour period.
Sample B would have a lower fraction of remaining nuclei compared to Sample A, indicating a shorter half-life. More nuclei in Sample B would have decayed in the same 1-hour period.
Sample C would have an even lower fraction of remaining nuclei than Samples A and B, suggesting a shorter half-life than both of them.
Sample D would have the lowest fraction of remaining nuclei after 1 hour, indicating the shortest half-life among the four samples. The majority of the nuclei in Sample D would have decayed within the 1-hour period.
In summary, the ranking of the samples based on the fraction of remaining nuclei after 1 hour would be Sample A > Sample B > Sample C > Sample D.
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