Q1; ___________ have almost half a set of electrons in the outer most energy level.
1- metalloids
2- metals
3- nonmetals
Q2;________ are known to be gasses at room temperature.
1- nonmetals
2- metalloids
3- metals
Answers
Answer:
2 metalliods....
1 metals
Related Questions
what type of reaction is the conversion of stilbene to stilbene dibromide? select one: a. elimination b. addition c. substitution
Answers
The type of reaction is "addition."
option B.
What type of reaction is the conversion of stilbene to stilbene dibromide?
The conversion of stilbene to stilbene dibromide involves the addition of two bromine atoms to the carbon-carbon double bond of stilbene, which results in the formation of a dihalide compound. Therefore, the type of reaction is "addition." The chemical equation for the reaction is:
stilbene + Br2 → stilbene dibromide
Thus, the conversion of stilbene to stilbene dibromide is an addition reaction because two bromine atoms are added to the carbon-carbon double bond of stilbene, resulting in the formation of a dihalide compound.
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The following properties are either physical or chemical. Which one is different from the rest based on those two category? A.) Density B.) Appearance C.) Color D.) Reactivity
Answers
Answer:
A.)physical B.)physical C.)physical D.)chemical
Carbon cycle – What are the main reservoirs
of the carbon cycle? Where do the inorganic and organic carbon
cycles interact? What are the major differences and similarities
between the inorganic and organic carbon?
Answers
The main reservoirs of the carbon cycle are the atmosphere, oceans, land (including vegetation and soils), and fossil fuels. In these reservoirs, carbon exists in both inorganic and organic forms.
The inorganic carbon cycle involves the exchange of carbon dioxide (CO2) between the atmosphere and oceans through processes like photosynthesis and respiration.
Organic carbon, on the other hand, is found in living organisms, dead organic matter, and soil organic matter. It is cycled through processes such as decomposition and consumption by organisms. The interactions between the inorganic and organic carbon cycles occur primarily in the biosphere, where photosynthesis converts inorganic carbon into organic carbon compounds. While inorganic carbon is primarily in the form of CO2, organic carbon is present in complex organic molecules. Both forms of carbon play crucial roles in energy transfer, nutrient cycling, and climate regulation.
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What is one disadvantage of hydroelectric energy?
Answers
SEP Use Mat Calculate the electronegativity differences and determine the
polarity for the bonds formed by the following pairs of atoms: K and F atoms and
N and O atom
Answers
This problem is asking for the electronegativity differences and polarity for the bonds formed between and K and F, and N and O. At the end, the results are 3.16 and ionic, and 0.40 and covalent, respectively.
Types of bondsIn chemistry, chemical bonds are formed when elements either share or gain electrons. Once they form the bond, one can tell much of the properties of the resulting compound based on the type of bond formed.
In such a way, one can evidence de formation of covalent and ionic bonds, the former exhibited when the electronegativity difference is between 0 and about 1.6 and the former beyond 1.7.
ElectronegativityIn chemistry, electronegativity is the tendency of an atom to attract electrons in a molecule, thus, we have the following for K, F, N and O as required: 0.82, 3.98, 3.04 and 3.44, respectively.
In such a way, one can calculate the difference electronegativity for the pairs KF and NO as shown below:
K-F =3.98 - 0.82 = 3.16
N-O = 3.44 - 3.04 = 0.40
Hence, the K-F bond turns out ionic whereas the N-O, covalent.
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Determine the number of atoms in 0. 50 moles of zinc
Answers
The number of atoms in 0. 50 moles of zinc is 3.01 x 10 ²³
The number of atoms in one particular carbon isotope, carbon-12, serves as the basis for the idea of the "mole." A mole of carbon atoms, or 6.02 10²³ carbon atoms, can be found in 12g of carbon-12.
The remaining atoms on the periodic table are identified by their molar masses, which indicate how many grams of each are required to make a mole, or 6.02 x 10 ²³atoms, of that element.
Zinc will have 6.02 x 10²³ if it has 1 mole of zinc. In chemistry, we love to cancel units, therefore we simply do so to address your issue.
The number of atoms in one particular carbon isotope, carbon-12, serves as the basis for the idea of the "mole." A mole of carbon atoms, or 6.02 10 23 carbon atoms, can be found in 12g of carbon-12.
The remaining atoms on the periodic table are identified by their molar masses, which indicate how many grams of each are required to make a mole, or 6.02 10 23 atoms, of that element.
Zinc will have 6.02 x 10 ²³ if it has 1 mole of zinc. In chemistry, we love to cancel units, therefore we simply do so to address your issue.
number of Zinc atoms= 0.50 moles x 6.02 x 10 ²³ = 3.01 x 10 ²³
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2. If a gas at 500 mL has a temperature of 45°C, then what is the new volume when the temperature is increased to 65°C? Show your work.
Answers
Answer:
V2= 531.4 ml
Explanation:
T1= 273+45 °C= 318 Kelvin
T2= 273+65 °C= 338 Kelvin
V1= 500ml *( 0.001L/1ml)= 0.5 Liters
V2= \(\frac{V1 * T2}{T1}\)= \(\frac{0.5 L * 338K}{318K}\) = 0.5314465409 Liters* (1 ml/0.001 L)= 531.4 ml
Hydrogen peroxide, H₂O2, decomposes into water and oxygen gas with an enthalpy
change of -37.77 kJ and an entropy change of -130.92 J/K. Will this reaction be
spontaneous if the H₂O2 is kept in a sub-zero refrigerator at -25 °C?
Answers
So, at 5 degrees Celsius, h2o2 decomposes.
What does the name Celsius mean?Celsius is denoted by the symbol °C. Anders Celsius (1701–1744), a Swedish physicist, was honoured by having this temperature scale created and given his name in 1742.ΔG = -37.77 kJ - (248.15 K)(-130.92 J/K)ΔG = -37.77 kJ + 32.45 kJΔG = -5.32 kJ/mol
What does Celsius serve?There are several nations that utilise the Celsius scale (sometimes known as centigrade) to measure temperature. A Swedish astronomer by the name of Anders Celsius invented the Celsius scale. The melting point of pure water at sea level, under normal pressure, is 0 degrees (°) Celsius on the thermometer.
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what is the number of ions in 310g of magnesium ions,Mg^2+
thank you so much
Answers
In 310 g of magnesium ions (Mg²⁺), there are approximately 7.69 × 10²⁴ magnesium ions. This calculation involves converting the mass of magnesium ions to moles.
To determine the number of ions in 310 g of magnesium ions (Mg²⁺), we need to convert the mass of magnesium ions to the number of moles and then use Avogadro's number to calculate the number of ions.
The molar mass of magnesium (Mg) is approximately 24.31 g/mol.
Number of moles = Mass / Molar mass
= 310 g / 24.31 g/mol
= 12.75 mol (rounded to two decimal places)
There is one magnesium ion in one mole of magnesium ions (Mg²⁺).
Number of magnesium ions
= Number of moles × Avogadro's number × Number of ions per mole
= 12.75 mol × 6.022 × 10²³ ions/mol × 1 ion
≈ 7.69 × 10²⁴ magnesium ions
Therefore, there are approximately 7.69 × 10²⁴ magnesium ions in 310 g of magnesium ions (Mg²⁺).
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g the isoelectric point of an amino acid is a. the ph at which there are no ions in solution. b. the ph at which there is no net electrical charge on the amino acid. c. the electrical charge on the amino acid in solution. d. the electrical charge of the protein surface.
Answers
The pH level at which an amino acid has no net electrical charge is known as its isoelectric point.
Since both the acidic and basic groups are fully protonated and deprotonated at the isoelectric point, the amino acid exists as a zwitterion (an internally neutral ion) with an equal number of positive and negative charges. The pKa values of the amino acid's ionizable groups, such as the carboxylic acid (COOH) group and the amino (NH2) group, determine the pH at which the amino acid has a net charge of zero.The pH level at which an amino acid has no net electrical charge is known as its isoelectric point. The amino acid occurs as a zwitterion (an anion) at the isoelectric point.The pKa values of the amino acid's ionizable groups, such as the carboxylic acid (COOH) group and the amino (NH2) group, determine the pH at which the amino acid has a net charge of zero.The pH level at which an amino acid has no net electrical charge is known as its isoelectric point. Since both the acidic and basic groups are fully protonated and deprotonated at the isoelectric point, the amino acid exists as a zwitterion (an internally neutral ion) with an equal number of positive and negative charges. The pKa values of the amino acid's ionizable groups, such as the carboxylic acid (COOH) group and the amino (NH2) group, determine the pH at which the amino acid has a net charge of zero.
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What does oxygen and sulfur make?
Answers
Answer: sulfur dioxide
Explanation:
1. Natural gas is considered a nonrenewable resource because
A. It takes millions of years to form.
A. It takes millions of years to form.,
B. It is very expensive to make.
B. It is very expensive to make.,
C. It produces pollution when burned.
C. It produces pollution when burned.,
D. It cannot be used to generate electricity.
Answers
Answer:
hope this is help helpful
Explanation:
natural gas are considered nonrenewable because they can not be replenished in a short period of time.
An Assay Question
THE FUNDAMENTAL NATURE OF STRATEGIC MANAGEMENT REQUIRES THE AWARENESS & UNDERSTANDING OF OUTSIDE FORCES & ENCOURAGES STRATEGIC MANAGERS TO ADOPT NEW IDEAS .
ELABORATE in one word ?
Answers
The fundamental nature of strategic management requires the awareness & understanding of outside forces & encourages strategic managers to adopt new ideas is known as Adaptation.
Three definitions of adaptability are connected. First, natural selection, a dynamic evolutionary process, adapts organisms to their environments, improving their evolutionary fitness. Second, it is a state that the populace has attained along that process. Thirdly, it is a phenotypic characteristic or adaptive trait that has been preserved and has evolved via natural selection and has a functional purpose in each individual organism.
History has recorded descriptions of adaptation going back to the time of the ancient Greek philosophers Empedocles and Aristotle. Natural theology of the 18th and 19th centuries saw adaptation as proof of the presence of a deity.
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what is the realationship between chemicals and cancer
Answers
Answer:
Explanation:
"An early link between cancer and a chemical was found in the late 1700s. An English physician noted that a large number of chimney sweeps had cancer of the scrotum due to exposure to soot, which contains chemicals known as polycyclic aromatic hydrocarbons. Since then, many more chemicals have been identified as known or suspected causes of cancer. "
Answer:
Chemical cause cancer
Explanation:
The value of Kp for the reaction 2 A(g) + B(g) + 3 C(g) → 2 D(g) + E(g) is 18530 at a particular temperature. What would be the value of Kp for the reaction 2 D(g) + E(g) → 2 A(g) + B(g) + 3 C(g)?
Answers
Answer:
\(Kp2=5.3967x10^{-5}\)
Explanation:
Hello there!
In this case, since the Kp for the first reaction is given, according to the following equilibrium expression:
\(Kp=\frac{p_D^2p_E}{p_A^2p_Bp_C^3} =18530\)
However, since the second reaction stands for the reverse of the initial one, the equilibrium expression would be:
\(Kp_2=Kp=\frac{p_A^2p_Bp_C^3}{p_D^2p_E}\)
And therefore its Kp the inverse of the aforementioned one:
\(Kp2=1/18530\\\\Kp2=5.3967x10^{-5}\)
Best regards!
Which statement best describes the difference between a compound and a mixture?
A: Compounds are physical combined, but mixtures are chemically combined.
B: Compounds are pure substances, but mixtures are not.
C: Compounds and mixtures are both heterogeneous.
D: All compounds are homogenous, but all mixtures are heterogeneous.
Answers
The correct answer is [D]
All compounds are homogenous, but all mixtures are heterogeneous.
What is the difference between homogenous and heterogenous?The words homogeneous and heterogeneous are often used in scientific contexts to describe the kinds of mixtures, but they can be also used in other ways, such as to describe groups of people.
Homogeneous mixtures are uniform in the structure or composition. For example, if you mix the table salt into water, this mixture is homogeneous because the salt completely dissolves into the water, meaning that the salt particles are evenly distributed throughout the water. Homogeneous mixtures are typically those whose component parts cannot be easily separated (such as in example of the salt water mixture).
In the contrast, heterogeneous mixtures consist of distinct substances and don’t have a uniform composition. As a simplified example, a salad is the heterogeneous mixture: you can see that salad obviously consists of different, separate ingredients, such as lettuce, tomatoes, and carrots. If you scoop out some of the salad into a bowl, it may not have same number of tomatoes as another scoop. The ingredients don’t blend together into a uniform whole but remain separate from each other and are unevenly distributed throughout mixture.
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how does the ph of a 0.1 m hcl solution compare to the ph of a 0.1 m hf solution?
Answers
The HCl solution's pH value will be less than 7, indicating an acidic pH, while the HF solution's pH value will be greater than 7, indicating a basic pH.
The pH of a 0.1 M HCl solution and a 0.1 M HF solution can be compared in the following way:
It is necessary to first understand the basics of acids and bases, as well as their pH values, in order to compare the pH values of a 0.1 M HCl solution and a 0.1 M HF solution. An acid is a substance that releases H+ ions in an aqueous solution, while a base is a substance that accepts H+ ions. The pH value is the negative logarithm of the hydrogen ion concentration (H+) in a solution.
The pH scale ranges from 0 to 14, with 7 indicating a neutral pH, values below 7 indicating acidic pH, and values above 7 indicating basic pH. The pH value of a 0.1 M HCl solution will be lower than that of a 0.1 M HF solution because HCl is a stronger acid than HF.
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If 0.025 gram of pb (No3)2 is dissolved in 100 gram of H2o ,what is the concentration of the resulting solution ,in parts per million?
Answers
The total mass of the solution is 0.100025 Kg. Hence, the concentration in parts per million is 246.93 ppm.
What is part per million ?Parts per million or ppm is a term used to express the concentration of a solution. The concentration of the a solution can be expressed in terms of the mass , volume or number of moles of the solute in the solution.
ppm of a solution = weight of solute in kg/weight of solution in kg ×10⁶.
Given , mass of solute lead nitrate = 0.025 g
mass of solvent = 100 g.
total mass of the solution = 100 + 0.025 = 100.025.g
mass in kg = 0.100025 Kg.
mass in kg of solute = 0.000025 Kg
ppm of solution = 0.000025 kg/ 0.100025 Kg ×10⁶. = 249.9 ppm.
Therefore, the concentration of the solution in ppm is 249.9 ppm.
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you've been experiencing acid indigestion lately, and you'd like a quick fix for the problem. you do a little research on the internet and discover that your problem is caused by excess stomach acid. in the pharmacy aisles, however, you're having a little trouble deciding what to purchase to address the problem. at the pharmacy counter, the clerk recommends that you purchase two different kinds of tablets: antacid a and antacid b. you hypothesize that a tablet of antacid a can neutralize more stomach acid than a tablet of antacid b because it contains two different antacids, and antacid b only has one. if you placed a tablet of each antacid in a beaker of acid at an initial ph of 2, what experimental results would support your hypothesis?
Answers
The pH of the recommended tablets, you would expect it to be higher than 7.
Symptoms of heartburn include a burning pain in the chest that usually occurs after eating and may occur at night. Pain that worsens when lying down or bending over. A bitter or acidic taste in the mouth. Some signs that you may have high stomach acid include:
abdominal discomfort, which may be worse on an empty stomach.
nausea or vomiting.
bloating.
heartburn.
diarrhea.
decreased appetite.
Decrease of weight without cause. The first truly effective heartburn treatment is antacids. It has been common practise for millennia to relieve discomfort by chewing chalk (calcium carbonate).
The majority of antacids on the market are made of aluminium and magnesium hydroxide. Some effervescent antacids contain sodium bicarbonate, also known as "baking soda," a traditional home treatment for stomach problems.
In order to shield the oesophagus from acid exposure, some antacids are mixed with an alginate [an insoluble material that raises surface tension in liquids] to create a combination that floats on stomach fluids.
In comparison to an antacid liquid, antacid tablets are slow acting and have less neutralising effect. Tablets need to be chewed and may react poorly with stomach acid. For the majority, tablets' convenience clearly surpasses these minor drawbacks.
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what type of chemical reaction occurs in fireworks
Answers
Answer:
combustion or/and oxidation
Explanation:
What is the mass concentration of 2mole HCL solution?(h=1,Cl=35.5)
Answers
Answer:
So the answer to the question “What is the mass concentration of hydrogen chloride in 2.0-molar hydrochloric acid?” is 73 grams per liter.
URGENT!!
Which substance is reduced in this following reaction? (which element goes through reduction).
Explain! (define what's going on, etc)
2Mg + O2 --> 2MgO
Answers
Answer:
i think it's oxygen
Explanation:
the smart kid in my class said so lol
If 50.0 g of NaN3 decompose, how many moles of N₂(g) will be produced? How many grams of
15.02
N2(g) will be produced?
Answers
For every mole of NaN3 that is broken down, one mole of N2(g) is produced. Using the molar mass of NaN3, which is 68.99 g/mol, we can determine how many moles of NaN3 are present given that we have 50.0 g of the substance.
We get 0.724 mol of NaN3 by dividing 50.0 g by 68.99 g/mol. We can determine that 0.724 mol of NaN3 will result in 0.724 mol of N2(g) since 1 mole of NaN3 yields 1 mole of N2(g). We may use the molar mass of N2(g), which is 28.02 g/mol, to determine the mass of N2(g) produced.
0.724 mol is multiplied by 28.02 g/mol to yield 20.3 g of N2(g). Therefore, 20.3 g of N2(g) will be created from 50.0 g of NaN3.
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Which of the following statements about pericyclic reactions is true? Multiple Choice In pericyclic reactions, bonds are broken and formed in multiple steps. In pericyclic reactions, all bonds are broken and formed in a single step. One Intermediate has been identified in pericyclic reactions. The transition state in a pericyclic reaction is acyclic.
Answers
The correct statement about pericyclic reactions is:
In pericyclic reactions, all bonds are broken and formed in a single step.
Pericyclic reactions are a class of organic reactions characterized by the simultaneous breaking and forming of multiple bonds in a concerted manner, meaning that all bond changes occur in a single step. This is in contrast to stepwise reactions where bonds are broken and formed in separate steps.
In a pericyclic reaction, the reactants rearrange their electrons in a concerted fashion, leading to the formation of new bonds and the breaking of existing bonds. This concerted process occurs through the overlap of molecular orbitals, allowing for the efficient transfer of electrons.
Pericyclic reactions are concerted reactions in which the breaking and forming of bonds occur simultaneously in a single step. They do not involve multiple steps or intermediates. The transition state in a pericyclic reaction is cyclic, not acyclic.
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Which properties do all solids share?
A. Color and fixed shape
B. Color and fixed volume
C. Fixed volume and fixed shape
D. Fixed shape; volume that depends on container
Answers
Answer:
c
Explanation:
because when you hold a solid in your hand does it move does it shift no it stays the same so it doesn't take the form of the container it's in cuz that's a liquid.
Write a scientific explanation describing if the night sky looks the same all year. Be
sure to support your claim with evidence and reasoning.
Answers
Just as the constellations change with the seasons, so does the night sky.
What is constellations ?Constellations refer to the groups of stars that form imaginary shapes in the night sky. They are commonly named after mythological characters, people, animals, and objects. In different parts of the world, people made different shapes out of the same group of bright stars. The rotation of the sky is actually due to the rotation of the earth. Constellations causes a day and night cycle as the earth rotates and light moves towards the sun to create day. Just as the sun rises in the east and sets in the west, so does the entire night sky. Therefore, the earth not only rotates, but also revolves around the sun. Constellations conveys seasonal constellations because our perspective on the sky changes depending on where the Earth is in its annual orbit.To learn more about constellations from the given link :
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if the gold-plating process occurs according to the following halfreaction, how many coulombs would be required to plate 0.600 g of au onto a metal?
Answers
To plate 0.600 g of gold (Au) onto a metal using the given gold-plating half-reaction 8.89 coulombs of charge would be required
The balanced half-reaction for the gold-plating process:
\(Au^3+ + 3e^-\) → \(Au\)
From the balanced half-reaction, we can see that three electrons (\(3e^-\)) are required to plate one atom of gold (Au).
To calculate the number of moles of gold (Au) in 0.600 g, we need to use the molar mass of gold, which is approximately 197 g/mol:
0.600 g Au * (1 mol Au / 197 g Au) = 0.00305 mol Au
Now, since three electrons are required to plate one atom of gold, we can calculate the total number of electrons needed:
0.00305 mol Au * (3 electrons / 1 atom) * (6.022 x\(10^2^3\) atoms/mol) = 5.49 x \(10^2^1\)electrons
Finally, we use Faraday's constant (F) to convert the number of electrons to coulombs. Faraday's constant represents the charge of one mole of electrons:
1 F = 96,485 C/mol
Therefore, the number of coulombs required to plate 0.600 g of gold onto a metal is:
5.49 x\(10^2^1\) electrons * (1 F / (6.022 x\(10^2^3\) electrons/mol)) * (96,485 C / 1 mol) ≈ 8.89 C
Therefore, 8.89 coulombs of charge would be required to plate 0.600 g of gold (Au) onto a metal using the given gold-plating half-reaction.
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The boiling temperature of the condensed gas is:
600°C
O-273°C
O-160°C
50°C
other
Answers
Well, the answer is the 4rth one "
50°C"
Evaporation cools the liquid that is left behind because the molecules that leave the liquid during evaporation: A. have kinetic energy B.have greater than average speedeh C.Have broken the bonds that held them in the liquid. D. Create vapor pressure.
Answers
Create vapor pressure is behind because the molecules that leave the liquid during evaporation.
What is evaporation ?
The water cycle's crucial step is evaporation. When a liquid transforms into a gas, evaporation takes place. As rain puddles "disappear" on a hot day or when wet clothing dries in the sun, it is simple to envision. The liquid water in these instances is evaporating into a gas known as water vapor rather than actually dissipating.
What is kinetic energy ?
When an item undergoes work—the transfer of energy—by being subjected to a net force, it accelerates and acquires kinetic energy.
Therefore, Create vapor pressure is behind because the molecules that leave the liquid during evaporation.
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PLEASE HELP ME 40 POINTS RIGHT ANSWERS ONLY!!!!! :)
Consider the solubility curve at right. which solid material is a solid solute?
Answers
Substance C is a solid solute because the solubility of a solid increases with increasing temperature. Therefore, option B is correct.
Solubility refers to the ability of a solute to dissolve in a solvent and form a homogeneous mixture called a solution. It is a measure of how much of a solute can dissolve in a given amount of solvent under specific conditions, such as temperature and pressure.
Solubility is typically expressed as the maximum amount of solute that can dissolve in a specified amount of solvent. The solubility of a substance is influenced by various factors, including the nature of the solute and solvent, temperature, pressure, and the presence of other substances.
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Answer: it's substance A hope it helps.!