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Related Questions
1. The names of the known elements fall into one of eight categories. List these 8 categories
(a. through h.)
Answers
It is divided into 2 blocks one is s-block and another is p-block .
Here are first 20 known elements .
\(\boxed {\begin{array}{|c|c|c|c|cccc|}\cline {1-8}\sf Element & \sf Symbol & \sf Valency & \sf{Atomic\:Number} & & \sf{Electron} & \sf Configuration & \\ \cline {5-8} &&&&\bf K&\bf L &\bf M&\bf N \\ \cline {1-8}\rm Hydrogen &\sf H & 1 & 1 & 1 &&& \\ \cline {1-8}\rm Helium &\sf He & 0 & 2 & 2 &&& \\ \cline {1-8}\rm Lithium &\sf Li & 1& 3 &2 &1 && \\ \cline {1-8}\rm Beryllium &\sf Be & 2 & 4 & 2 & 2 && \\ \cline {1-8}\rm Boron &\sf B & 3 & 5 & 2 & 3 && \\ \cline {1-8}\rm Carbon & \sf C & 4 & 6 & 2 & 4 && \\ \cline {1-8}\rm Nitrogen &\sf N & 3 & 7 & 2 & 5 && \\ \cline {1-8}\rm Oxygen &\sf O & 2 & 8 & 2 & 6 && \\ \cline {1-8}\rm Fluorine &\sf F & 1 & 9 & 2 & 7 && \\ \cline {1-8}\rm Neon & \sf Ne & 0 & 10 & 2 & 8 && \\ \cline {1-8}\rm Sodium &\sf Na & 1 & 11 & 2 & 8 & 1 &\\ \cline {1-8}\rm Magnesium &\sf Mg & 2 & 12 & 2 & 8 & 2 & \\ \cline {1-8}\rm Aluminium &\sf Al & 3 & 13 & 2 & 8 & 3 & \\ \cline{1-8}\rm Silicon &\sf Si & 4 & 14 & 2 & 8 & 4 & \\ \cline {1-8}\rm Phosphorus &\sf P & 3 & 15 & 2 & 8 & 7 & \\ \cline {1-8}\rm Sulphur &\sf S & 2 & 16 & 2 & 8 & 8 & \\ \cline{1-8}\rm Chlorine &\sf Cl & 1 & 17 & 2 & 8 & 8 &1 \\ \cline {1-8}\rm Argon &\sf Ar & 0 & 18 & 2 & 8 & 8 & 2 \\ \cline {1-8}\rm Potassium &\sf K & 1 & 19 & 2 & 8 & 8 &3 \\ \cline {1-8}\rm Calcium &\sf Ca & 2 & 20 & 2 & 8 & 8 & 4 \\ \cline{1-8} \end {array}}\)
In the image above you see an 8mL graduated cylinder or
the left and an excerpt of a burette on the right. Each
holds a fixed volume of liquid. What are the volume
readings in each of these pieces of glassware? Give your
readings to 2 decimal places.
The volume in the graduated cylinder is
mL
The volume in the burette is
mL.
Answers
Answer: graduated cylinder: 4.25
Explanation:
Global warming is most closely associated with what
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Global warming is a phenomenon that has become an increasing concern worldwide.
The increase in Earth's average surface temperature due to rising levels of greenhouse gases, particularly carbon dioxide, in the atmosphere is referred to as global warming.
It is most closely associated with climate change.
It is a long-term trend that has become one of the most pressing environmental problems facing our planet today.
The primary cause of global warming is human activity.
Human beings are responsible for releasing large amounts of carbon dioxide, methane, and other greenhouse gases into the atmosphere through the burning of fossil fuels such as coal, oil, and natural gas.
These gases trap heat from the sun's rays and cause the Earth's temperature to rise, leading to global warming.
The effects of global warming can be seen in rising sea levels, more frequent and severe weather events such as hurricanes, droughts, and floods, and the melting of ice caps and glaciers.
It is also having a significant impact on the world's ecosystems, with changes in temperature and precipitation patterns affecting the distribution and abundance of plant and animal species.
Although global warming is a serious issue, there are ways to reduce its impact.
Reducing our dependence on fossil fuels by transitioning to renewable energy sources such as wind and solar power can help to reduce greenhouse gas emissions.
Additionally, planting trees and other vegetation can help to absorb carbon dioxide from the atmosphere and store it in the ground. Education and awareness-raising can also help individuals and communities take action to mitigate the effects of global warming.
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which is the graph of the function g(x) = f(-x)
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To graph the function g(x) = f(-x), you can start with the graph of f(x) and then reflect it about the y-axis.
What is a graph of the function g(x) = f(-x)?To find the graph of the function g(x) = f(-x), we can start with the graph of the function f(x) and then reflect it about the y-axis.
If the graph of f(x) is symmetric with respect to the y-axis, meaning it is unchanged when reflected, then g(x) = f(-x) will have the same graph as f(x).
However, if the graph of f(x) is not symmetric with respect to the y-axis, then g(x) = f(-x) will be a reflection of f(x) about the y-axis.
In either case, the resulting graph of g(x) = f(-x) will be symmetric with respect to the y-axis.
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Calculation Questions (2 Questions, 12 Points Each)1. Electrical charge is sometimes reported in coulombs (C). On this scale, 1 electronhas a charge of -1.6 x 10-19 C. Suppose your body acquires a -125 mC charge on adry day. How many excess electrons has it acquired?
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Calculations:
• Let ,x , represent electron in a body.
,• use the following formula tocalculagte excess electrons acquired.
,• Charge = 125mC /10000 =1.25 x10^-2
\(\begin{gathered} \text{Charge = electron }\cdot\text{ electron charge } \\ 1.25X10^{-2\text{ }}=\text{ x }\cdot1.6X10^{-19} \\ x\text{ = }\frac{1.25X10^{-2}}{1.6X10^{-19}} \\ \text{ }\therefore x\text{= }7.8125X10^{-22} \end{gathered}\)This means that there are 7.8125x10^-22 excess electron aqcuired.Consider the reaction between copper(II) chloride and aluminum.Write the general skeleton reaction.Write the balanced reduction half reaction.Write the balanced oxidation half reaction.Write the balanced net ionic equation.Write the full balanced redox reaction.
Answers
Answer:
• General skeleton reaction:
\(CuCl_{2}+Al\operatorname{\rightarrow}AlCl_{3}+Cu\)• Balanced reduction half reaction:
\(3Cu^2+6e^-\operatorname{\rightarrow}3Cu^0\)• Balanced oxidation half reaction:
\(2Al^0\operatorname{\rightarrow}2Al^3+6e^-\)• Balanced net ionic equation:
\(3Cu^{+2}+2Cl^{-1}+2Al^0\operatorname{\rightarrow}3Cu^0+2Al^{+3}+3Cl^{-1}\)• Full balanced redox reaction:
\(3CuCl_2+2Al\rightarrow2AlCl_3+3Cu\)Explanation:
1st) It is necessary to write the skeleton reaction (unbalanced reaction):
\(CuCl_2+Al\rightarrow AlCl_3+Cu\)In the reaction, copper (II) chloride react with aluminum to produce aluminum chloride and copper.
2nd) We need to know the oxidation number of each atom in the reaction, then we can find the element that oxidized and the element that id reduced:
Oxidation numbers:
+2 -1 0 +3 -1 0
\(CuCl_{2}+Al\operatorname{\rightarrow}AlCl_{3}+Cu\)With the oxidation number we can see that Al goes from 0 to +3, so the aluminum atom oxidizes. And, the copper atom goes from +2 to 0, so it is reduced.
3rd) To write the balanced reduction half reaction, it is necessary to balance all elements except oxygen and hydrogen (in this case, there is no oxygen or hydrogen atoms).
\(Cu^{+2}+2e^-\rightarrow Cu^0\)Then, it is important to balance the electrons in each half reaction, so in the Cu half reaction we have to multiply everything by 3:
\(\begin{gathered} (Cu^2+2e^-\operatorname{\rightarrow}Cu^0)*3 \\ 3Cu^2+6e^-\operatorname{\rightarrow}3Cu^0 \end{gathered}\)4th) To write the balanced oxidation half reaction, we have to proceed like in the previous step:
\(Al^0\rightarrow Al^{+3}+3e^-\)We have to balance the electrons here too, but in this case we have to multiply by 2:
\(\begin{gathered} (Al^0\operatorname{\rightarrow}Al^3+3e^-)*2 \\ 2Al^0\operatorname{\rightarrow}2Al^3+6e^- \end{gathered}\)Note: Electron balance is done to cancel out the electrons in both reactions, so we need to have the same number of electrons on each side of the half reactions.
5th) Now, we can write the balanced net ionic equation, without the electrons:
\(3Cu^{+2}+2Cl^{-1}+2Al^0\operatorname{\rightarrow}3Cu^0+2Al^{+3}+3Cl^{-1}\)6th) Finally, we can write the full balanced redox reaction, including the other elements, in this case Cl:
\(3CuCl_2+2Al\rightarrow2AlCl_3+3Cu\)
CxHy +O2 --> H2O + CO2
Question 1 options:
Decomposition
Combustion
Synthesis
Single Displacement
Look down below at the picture thank you
Answers
Single displacement because the oxygen is not balance
A teacher has given a lab student a white chemical sample and asks her to confirm that it contains 33.4 g sodium hydroxide (NaOH). If the teacher provides the amount in formula unitswhich value is correct?
A. 40.0 g
B. 46.78
C. 5.03 x 10^23
D. 7.03 x 10^24
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The amount in, formula unit. of 33.4 g sodium hydroxide is 5.03 x \(10^{23\) . Option C.
Formula unitsIn order to calculate the mass of NaOH from formula units, first, we need to know the molar mass of NaOH, which is 40 g/mol1.
The formula units are related to moles by Avogadro’s number which is 6.022 x 10^23 formula units per mole.
Therefore, we can calculate the mass of NaOH as follows:
33.4 g NaOH = (33.4 g NaOH / 40) x (6.022 x 10^23) = 5.03 x \(10^{23\) formula units.
In other words, there are 5.03 x \(10^{23\) formula units in 33.4 g sodium hydroxide.
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Which statement best describes the driving force behind the electrophilic addition of strong acid to an alkene
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The chemical transformation of a carbon-carbon double bond is by addition reaction. The statement best describes the driving force is that the reaction is favorable because the total bond strength in the products is greater than in the reactants.
A great number of reagents often found in inorganic and organic, have been known to add to the functional group of alkenes.The bond energies of a molecule is simply known as the energies needed to break all the covalent bonds in the molecule.
When the bond energies of the product molecules is known to be greater than the bond energies of the reactants, the reaction is regarded as exothermic.
The full question is below
Which statement best describes the driving force behind the electrophilic addition of strong acid to an alkene?
The reaction is favorable because the pi bond is stronger than a sigma bond and it takes more energy to break it.
The reaction is favorable because a less stable, high-energy intermediate is formed.
The reaction is favorable because the first step is the rate-determining step.
The reaction is favorable because the total bond strength in the products is greater than in the reactants.
The reaction is favorable because the overall reaction is endothermic.
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cyanate ion waste solution from gold-mining operations can be destroyed by treatment with hypochlorite ion in basic solution. Write a balanced oxidation-reduction equation for this reaction. OCN^-(aq) +OCl^-(aq) --> CO2^-(aq)+N2(g)+Cl^-(aq)+H2O(l)
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The balanced oxidation-reduction equation for the destruction of cyanate ion waste solution from gold-mining operations by treatment with hypochlorite ion in basic solution is:
OCN⁻(aq) + OCl⁻(aq) + 2OH⁻(aq) → CO₂⁻(aq) + N₂(g) + Cl⁻(aq) + H₂O(l)
In this reaction, the cyanate ion (OCN⁻) is oxidized to carbon dioxide (CO₂⁻) and nitrogen gas (N₂), while the hypochlorite ion (OCl⁻) is reduced to chloride ion (Cl⁻). The reaction takes place in basic solution, which provides the hydroxide ions (OH⁻) needed to neutralize the acidic H⁺ ions produced during the oxidation of the cyanate ion.
The reaction is exothermic, releasing heat energy as the products form. This reaction is an effective way to dispose of the cyanate ion waste generated by gold-mining operations, as it converts the hazardous waste into harmless gases and ions.
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embalming authorization may be given by all of the following except the? Bailee, next of kin, spouse, or decedent
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The correct answer is "decendent." Embalming authorization may be given by the bailee, next of kin, or spouse, but not by the decedent.
When is the authorization given?
The term "decedent" refers to the person who has died; they are unable to give consent for embalming or any other post-mortem procedures. According to legal and cultural customs, the choice to embalm is often taken by the designated representative, such as the bailee (person in charge of the body), next of kin, or spouse.
Hence, embalming authorization may be given by the bailee, next of kin, or spouse, but not by the decedent.
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6. How could a dichotomous be helpful to you if you were lost in the wilderness?
Answers
Answer:
Brainliest pls
Explanation:
Dichotomous keys are exceptionally valuable since they permit non-master clients to distinguish living beings by guiding them to check the known, significant creatures out
Gaseous methane (CH4) will react with gaseous oxygen (O₂) to produce gaseous carbon dioxide (CO₂) and gaseous water (H₂O). Suppose 5.5 g of methane is mixed with 11.5 g of oxygen. Calculate the minimum mass of methane that could be left over by the chemical reaction. Be sure your answer has the correct number of significant digits.
Answers
Answer:
Top answer:
The maximum mass of water (H₂O) produced from the reaction between
Explanation:
Gaseous methane ch4 will react with gaseous oxygen o2 to produce gaseous carbon dioxide co2 and gaseous water h2o . suppose 1.44 g of ...
Oxygen and hydrogen are both elements that are found as gases at room temperature. When oxygen combines with hydrogen, they produce the compound water according to the chemical equation below.
O2 + 2 H2 2 H2O
Water is a liquid at room temperature. This example shows that in a chemical equation, the substance that is produced
A.
has properties that are different from the original substances.
B.
can only contain a single type of element.
C.
contains fewer types of elements than the original substances.
D.
always has the same properties as the original substances.
Answers
Answer:
A
Explanation:
has properties that are different from the original substances.
Consider the complete reaction of 63.2 g of HCl with excess oxygen gas. What mass of chlorine gas product forms? 4 HCl(g) + O2(g) → 2 H2O(l) + 2 Cl2(g)
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The mass of chlorine gas product formed is 61.4 g.
What is the mass ?
First, we need to determine which reactant is limiting and which is in excess. To do this, we can use the given mass of HCl and convert it to moles:
63.2 g HCl × (1 mol HCl/36.46 g HCl) = 1.73 mol HCl
Next, we can use stoichiometry to determine how many moles of \(Cl_{2}\) will be produced from 1.73 mol of HCl:
1.73 mol HCl × (2 mol \(Cl_{2}\)/4 mol HCl) = 0.865 mol \(Cl_{2}\)
Finally, we can convert the moles of \(Cl_{2}\) to grams using its molar mass:
0.865 mol \(Cl_{2}\) × (70.91 g \(Cl_{2}\)/1 mol \(Cl_{2}\)) = 61.4 g \(Cl_{2}\)
Therefore, the mass of chlorine gas product formed is 61.4 g.
What is stoichiometry ?
Stoichiometry is a branch of chemistry that deals with the calculation of the quantities of reactants and products involved in a chemical reaction. It involves using balanced chemical equations to calculate the amounts of reactants required to produce a certain amount of product, or the amount of product that can be obtained from a given amount of reactant. Stoichiometry is an important tool for predicting the outcomes of chemical reactions and for designing chemical processes in industry.
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Avagadro's number was calculated by determining the number of atoms in
Answers
Answer:
12.00 g of carbon 12
Explanation:
newtons 1st law is also called what?
Answers
Answer: Newton's first law is often called the law of inertia
Explanation:
Which step is this ?prophase I, Anaphase I, prophase II, Anaphase II
Answers
Answer:
Prophase 1
Explanation:
Answer:
The correct answer will be prophase I
Explanation:
During this stage, the genetic code is together and hasn't split yet therefore, the answer is prophase I hopefully this helps!
Is the ethane molecule more or less polar than water? Why or why not?
Answers
Answer: Less
Explanation:
Ethane is a non-polar molecule while water is a polar molecule
Objects that have a higher density than water can sometimes be observed floating on water. which property of water explains this phenomenon?
Answers
Answer: Under what condition an object having density greater than water will float on water?
If an object is more dense than water it will sink when placed in water, and if it is less dense than water it will float. Density is a characteristic property of a substance and doesn't depend on the amount of substance.
Glycolysis is the process by which energy is harvested from glucose by living things. Several of the reactions of glycolysis are thermodynamically unfavorable (nonspontaneous), but proceed when they are coupled with other reactions.
Reaction A: Pi+glucose⟶glucose-6-phosphate+H2OΔG=13.8 kJ/mol
Reaction B: Pi+fructose-6-phosphate⟶fructose-1,6-bisphosphate+H2OΔG=16.3 kJ/mol
Reaction C: ATP+H2O⟶ADP+PiΔG=−30.5 kJ/mol
Select every unfavorable reaction.
reaction B
reaction C
reaction A
Select every set of coupled reactions where the overall reaction is favorable.
reactions B and C
reactions A and B
reactions A and C
What is the net change in free energy if one set of reactions from the previous question is coupled so that the overall reaction is favorable? Note that if you selected more than one set of coupled reactions as favorable in the previous question, you may enter the net change for any one of your selected sets.
Answers
Answer:
Unfavorable reactions: Reaction A and Reaction B.
Coupled reactions favorable: Reactions B and C and Reactions A and C.
Net change:
Reactions B and C : -14.2kJ/mol
Reactions A and B : 30.1kJ/mol
Reactions A and C: -16.7kJ/mol
Explanation:
A reaction is thermodynamically favorable (spontaneous) if ΔG < 0. Thus, the unfavorable reactions -ΔG > 0- are:
Reaction A and reaction B.
When reaction C is coupled with reaction B and reaction A the chemical equation is:
ATP + fructose-1,6-phosphate ⟶ ADP + fructose-1,6-bisphosphate
ΔG = 16.3 - 30.5 = -14.2 kJ/mol
ATP + glucose ⟶ ADP + glucose-6-phosphate
ΔG = 13.8 - 30.5 = -16.7 kJ/mol
The coupled reaction of A and B has a change in free energy of:
ΔG = 13.8 + 16.3 = 30.1 kJ/mol
Use Henry's law to determine the molar solubility of helium at a pressure of 1.1 atm
and 25 ∘C . Henry’s law constant for helium gas in water at 25 ∘C is 3.70⋅10−4M/atm
.
Answers
Apply Henry's law to calculate the molecular absorption of helium at 1.5 atm, 25 °C, and 1.5 atm of pressure. Helium in water obeys Henry's law without exception.
A gas is what?Compared to other states of material, including such solids and liquids, gases get a lower density. Particles have such a great deal of kinetic energy and are not really attracted to one another, thus there is a lot of unoccupied space between them. One element, like hydrogen gas (Co and co2), a complex, like dioxide (CO2), or even a combination of multiple gases, like air, can make up a gas.
What does helium mean?Yet, helium is an essential component in numerous industries, such as high-tech manufacturing, medical technology, and scientific research.
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Explain two positive aspects of using methane recapture systems.
Answers
Answer:
Two positive aspects of using methane recapture systems are able to generate significant electricity. Another benefit is that the process of anaerobic digestion creates heat that can be used to warm buildings where animals are kept
Answer: The correct answer is;
Two positive aspects of using methane recapture systems include lowering the impact on greenhouse gasses and the production of energy. Methane is a very potent greenhouse gas that is contributing to global warming. As a result, the recapturing process reduces the methane impacts of global warming by reclaiming and reusing the gas for other purposes. Recaptured methane can be stored and used to generate electricity or used as fuel to power updated vehicles and other engines on the farm. The overall benefits from this combination are reducing impacts causing global warming and lower the cost of electricity or fuel on the farm.
Explanation: This answer has been confirmed correct.
In which of Earth's layers are the convection currents?
crust
mantle
inner core
lithosphere
Answers
What are the properties of gas
Answers
Answer:
1) easy compressed
2) fills its container
3) far more space
Explanation:
Indefinite Shape or Volume. Gases have no definite shape or volume. ...
Compressibility and Expandability. ...
Diffusivity. ...
Pressure.
Solid potassium chloride is obtained by the reaction of solid potassium and chlorine gas .
Answers
Answer:
yes
Explanation:
when chlorine gas reacts with solid potassium then a synthesis reaction takes place which leads to the formation of solid potassium chloride
In the SOLID state of matter ,particles have enough energy to move freely but not enough energy to overcome their attraction for each other
Answers
In the solid state of matter, particles, such as atoms, ions, or molecules, are closely packed and held together by strong intermolecular forces, such as ionic bonds, metallic bonds, or covalent bonds.
In a solid, particles have enough energy to vibrate around fixed positions but do not have enough energy to overcome the attractive forces between them. These attractive forces, also known as cohesive forces, arise from the electrostatic interactions between particles or the sharing of electrons in covalent bonds.
The energy of the particles in a solid is typically much lower than in the liquid or gaseous states, resulting in a fixed arrangement of particles.
The movement of particles in a solid is characterized by vibrations or oscillations around their equilibrium positions.
These vibrations occur due to the thermal energy present in the solid, but the particles remain relatively fixed in their positions due to the strong attractive forces. The amplitude of the vibrations increases with increasing temperature, as the particles gain more thermal energy.
However, the particles in a solid do not have enough energy to break the intermolecular bonds and move freely throughout the entire solid. Instead, they can only move within their local vicinity or lattice positions.
This restricted movement is what distinguishes the solid state from the liquid or gaseous states, where particles have enough energy to overcome intermolecular forces and move more freely.
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A scientist claims to have discovered an element with 30 protons in its nucleus. He determines it has 60 electrons. Why is his information False?
A.The number of electrons is always equal to the number of protons in its outer shell.
B.The number of protons, the number of neutrons, and the number of electrons are always equal.
C.The number of electrons in an atom of an element is always the same as the number of protons in its nucleus.
D.The number of electrons in an atom of an element is always half of the number of the protons in its nucleus.
Answers
Answer:
the number of electrons in an atom of an element is always the same as the number of protons in its nucleus
The number of electrons in an atom of an element being always the same
as the number of protons in its nucleus is False.
What is an Electron?This is a sub-atomic particle which is negatively charged and is usually
involved in chemical reactions.
Electropositive elements donates electrons while electronegative
elements accepts electrons during chemical reactions which is why the
number of proton and electron aren't always the same.
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Draw 4 decyne structure
Answers
The structure of the alkyne 4 - decyne is shown in the image attached.
How do you draw 4-decyne?Alkyne functional group compounds with a triple bond made of carbon and carbon contain 4-decyne (C). The triple bond is found at the fourth carbon position in the ten-carbon chain (decyne) of 4-decyne.
Nine hydrogen atoms (H) are joined to the first nine carbon atoms (C), starting from the left side.
In conclusion, 4-decyne is made up of a chain of ten carbon atoms, with the fourth carbon atom serving as the center of a carbon-carbon triple bond (C). Except for the carbon involved in the triple bond, all carbon atoms are connected to hydrogen atoms.
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The displacement by CH3CO2- on (a) bromoethane or (b) bromocyclohexane. ___ Submit AnswerTry Another Version
Answers
Answer:
The displacement by \(CH_{3}CO_{2}^{-}\) on bromoethane.
Explanation:
Given that,
The displacement by \(CH_{3}CO_{2}^{-}\) on bromoethane or bromocyclohexane.
We know that,
Bromoethane is not stable. It can easily break. But bromocyclohexane is more stable obstruct and very strong to displace.
Bromocyclohexane is a ring and we can not break easily of a ring.
So, bromocyclohexane does not displace by \(CH_{3}CO_{2}^{-}\).
Hence, The displacement by \(CH_{3}CO_{2}^{-}\) on bromoethane.