The element which has most similar chemical properties to carbon is silicon.
What are chemical properties?These properties are defined as those properties which become evident during or after a chemical reaction after the identity of the substance is changed during chemical reaction.
These properties cannot be determined externally just by viewing the substance ,these change immensely after a substance undergoes a chemical change.These are used for identification of unknown substances and for building up chemical classifications.
The major chemical properties are flammability,toxicity,reactivity,acidity and heat of combustion.For a chemical property to be apparent , it is necessary that the structure of the substance is altered.Chemical properties are almost similar for elements in a group.
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The release of _____ causes the bubbles in fermented beverages and the rising of bread.
Answer:
The given blank can be filled with carbon dioxide.
Explanation:
Carbon dioxide one of the by-products of fermentation is used in the production of carbonated beverages and in manufacturing of bread. In the brewing industry, alcoholic fermentation takes place in which transformation of sugar is done into ethyl alcohol and carbon dioxide. The carbon dioxide, which is the by-product in the process bubbles through the liquid and disperses into the air. The same phenomenon of carbon dioxide is used to cause rising of the bread.
What is the ph of a solution when the number of h+ ions equals the number of oh– ions in the liquid?
An ion from a given element has 27 protons and 24 electrons. what is the charge on the ion? -
A neutral atom has equal number of protons and electrons. The proton is positive while the electron is negative so it cancels out when it has equal number. In this case, there are 3 more protons. Therefore the charge of the ion is 3+.
Answer:
3+
An ion with 27 protons and 24 electrons has a +3 charge, resulting from the surplus of three protons over electrons.
Explanation:The charge on an ion is determined by the difference between the number of protons and electrons. In this case, the ion has 27 protons and 24 electrons. Since protons have a positive charge and electrons have a negative charge, an ion with more protons than electrons will have a positive charge. The charge is calculated as the number of protons minus the number of electrons, which in this case is 27 - 24 = +3. Therefore, the ion has a +3 charge.
In a redox reaction what happens to a substance's charge when it is oxidized
Will and object with a volume of 77 grams per cubic centimeters and a mass of 65 grams float or sink in water?
How many dots should be indicated in the electron dot structure of arsenic
There should be 5 dots indicated in the electron dot structure of arsenic.
Arsenic is a chemical element with the symbol As and atomic number 33. It is a post-transition metal in the periodic table and is chemically similar to its group neighbours sulfur and phosphorus.
The electron dot structure of arsenic is a representation of the valence electrons of the arsenic atom. The valence electrons are the electrons that are found in the outermost shell of the atom. They are the electrons that are involved in chemical bonding.
The atomic number of arsenic is 33, which means that there are 33 protons in the nucleus of an arsenic atom. The number of electrons in a neutral atom is equal to the number of protons in the nucleus. This means that there are also 33 electrons in a neutral arsenic atom.
The electron configuration of arsenic is [Ar] 3d¹⁰ 4s² 4p³. This means that the outermost shell of arsenic has 5 electrons. The 3d¹⁰ electrons are filled, and the 4s² 4p³ electrons are the valence electrons.
The 5 valence electrons of arsenic are represented by 5 dots in the electron dot structure. The dots are arranged around the arsenic atom in a trigonal pyramidal shape.
The electron dot structure of arsenic is important for understanding the chemical properties of arsenic. The valence electrons of arsenic are involved in chemical bonding, and the shape of the electron dot structure affects the reactivity of arsenic.
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If 2 grams of element X combines with 4 g of element y to form a compound XY, How many grams of element y would combine with 35 g of X to form the same compound
5. Mr. Martin's Spanish class is 45 minutes long. If it starts at 3:30, what time does it end?
The hydrogen-line emission spectrum includes a line at a wavelength of 434 nm. What is the energy of this radiation? (h= 6.626 x 10 ⁻³⁴ J * 8 )
SHOW WORK
A hydrogen halide diffuses 1.49 times faster than HBr. This hydrogen halide is
To solve this problem, we must assume ideal gas behaviour so that we can use Graham’s law:
vA / vB = sqrt (MW_B / MW_A)
where,
vA = speed of diffusion of A (HBR)
vB = speed of diffusion of B (unknown)
MW_B = molecular weight of B (unkown)
MW_A = molar weight of HBr = 80.91 amu
We know from the given that:
vA / vB = 1 / 1.49
So,
1/1.49 = sqrt (MW_B / 80.91)
MW_B = 36.44 g/mol
Since this unknown is also hydrogen halide, therefore this must be in the form of HX.
HX = 36.44 g/mol , therefore:
x = 35.44 g/mol
From the Periodic Table, Chlorine (Cl) has a molar mass of 35.44 g/mol. Therefore the hydrogen halide is:
HCl
A mathematical equation is an example of: A scientific theory A scientific law A model More than one of these
A mathematical equation is typically an example of a scientific law, representing a concise description of a relationship in nature supported by scientific evidence and experiments. It can also serve as a model, but it is not usually an example of a scientific theory. So the correct option is the second option.
Explanation:A mathematical equation in the context of science is often a way of expressing a scientific law. This is because scientific laws are frequently described using mathematical formulas that stipulate a consistent relationship between variables, which is expected to hold true universally. For example, Newton's second law of motion which is framed as F = ma where F stands for force, m for mass, and a for acceleration, succinctly describes the relationship between these three quantities. Unlike scientific theories, which are more complex and typically cannot be condensed into a single equation, a law is more concise and is often supported by repeated experiments and observations.
Therefore, a mathematical equation is an example of a scientific law. It is a model of sorts, as it can be used to predict and understand real-world phenomena based on the relationships it describes. Importantly, while theories provide a broader and more detailed explanation of natural phenomena and are the end result of the scientific method, laws describe more specific actions or relationships.
In summary, while a mathematical equation can be part of scientific laws and models, it is not typically an example of a scientific theory.
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Use the periodic table entry below to answer the following question.
How many protons does the element cobalt (Co) have?
27
32
58.93
59
The answer is A (27)
Which of the following procedures involves a physical change in one of the substances?
A. creating salt by reacting sodium metal and chlorine gas
B. allowing a nail to rust
C. building a model rocket propelled by mixing baking soda and vinegar
D. Separating a salt solution by evaporating the water
Answer:
D. Separating a salt solution by evaporating the water
Explanation:
B. Allowing a nail to rust is a chemical change.
Becuase once the nail rust it turns into flakes and therefore is no longer a nail.
C. building a model rocket propelled by mixing baking soda and vinegar
By mixing baking soda (a powder) into vinegar ( a Acid) it causes a explosion...
the baking soda dissolve into the acid.... This a chemical reaction
A.creating salt by reacting sodium metal and chlorine gas
Sodium is salt but it says.... Sodium metal..... chlorine gas Changes color and it has a strong odor... chlorine gas with sodium metal turns it into salt.... it doesnt stay a metal or a gas it CHANGES.....
so therefore its a Chemical change
When A object or substance changes form or it causes a exsplosion or reaction it is a chemical change.
D. Separating a salt solution by evaporating the water
For a physical change your object may change color or shape but its still the same object.
salt in water ... The salt dont dissolve it just salty water.
So seperating salt by evaporating the water is a physical change.
The answer is separating a salt solution by evaporating the water
A physical change can be described as a change that cannot be reversed. In a physical change, there is no creation of a new substance. Although there may be a slight change in the matter, size, color or shape of the compound that is undergoing this change. In this type of change(physical change) the physical part/appearance of the compound might change but this does not in any way affect the chemical composition of the substance.
These options listed below are not examples of a physical change;
- creating salt by reacting sodium metal and chlorine gas
- allowing a nail to rust
- building a model rocket propelled by mixing baking soda and vinegar
Hence the example of physical change in the option is;
Separating a salt solution by evaporating the water
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What is the differentences between atomic number and atomic mass?
Atomic number represents the number of protons, while atomic mass represents the weighted average of the masses of an element's naturally occurring isotopes.
You are given 60 ml of 2.0 m naoh solution. how many ml of 6.0 m hcl solution is needed to completely neutralize the naoh solution? s
How do you increase the concentration of a solution wiki?
How does the state of atoms in a neon light change when light is emitted?
When light is emitted, atoms in a neon light loose energy according to the concept of emission spectrum.
What is emission spectrum?Emission spectrum is defined as a spectrum of a chemical compound or substance composed of frequencies of electromagnetic radiation. Radiations which are emitted while electron make transition from higher to lower energy level.
Energy of photon is equal to the difference between the two energy states . There are many possible electronic transitions in an atom and every transition has a specific wavelength.
Collection of different transitions with respect to different wavelengths makes up an emission spectrum.Emission spectrum of each element is unique and therefore spectroscopy is used to identify elements which are present in different substances.
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The recognized standard means of inquiry used by research scientists is the method
All of the elements in a family or group have similar chemical properties. Which of the following statements best explains why this is true?
A. The elements in a group have the same number of protons in their nuclei.
B. The elements in a group have similar atomic mass numbers.
C. The elements in a group have the same number of valence electrons.
D. The elements in a group have similar atomic numbers.
How many chlorine atoms are there in two calcium chloride formula units?
Answer Calcium chloride has the molecular formula [tex]CaCl_{2}[/tex] from which we can say that one molecule of calcium chloride consist of one atom of calcium and two atoms of chlorine.
given : 2 mol of [tex]CaCl_{2}[/tex]
total moles of chlorine atoms = number of atoms in one mole × number of formula units= 2×2= 4
Total number of atom = Total number of moles × Avogadro number
So, total number of chlorine atoms =
4 × 6.0221×[tex]10^{23}[/tex] =2.4088×[tex]10^{24}[/tex] atoms
The diagram illustrates the steps in a process that occurs in the cells of many organisms. Based on the diagram, the process of glycolysis most likely
a)begins the breakdown of glucose
b)produces oxygen for organisms to use
c)stores energy in molecules of water and carbon dioxide
d)recycles glucose within the cells of simple organisms
Answer:
A
Explanation:
Glycolysis is the first set of reactions in the breakdown of glucose.
During glycolysis, there are many enzymes and reactions that take place, in order to produce 2 molecules of ATP, and pyruvate.
Pyruvate then goes on to be part of another set of reactions which release more energy.
Glycolysis is the reaction that takes place in our bodies, and we do not produce our own oxygen, and hence option B is incorrect.
Option C is considered incorrect because although water and carbon dioxide are formed as products, glycolysis does not store energy in those molecules.
Option D is also wrong, because glycolysis does not recycle glucose, it breaks it down to release energy.
If a single gold atom has a diameter of 2.9×x10−8 cm, how many atoms thick was rutherford's foil
27,586
Further explanationGiven:
A single gold atom has a diameter of [tex]\boxed{ \ 2.9 \times 10^{-8} \ cm. \ }[/tex]
From a reference, the Rutherford gold foil used in his scattering experiment had a thickness of approximately [tex]\boxed{ \ 8 \times 10^{-3} \ mm. \ }[/tex]
Question:
How many atoms thick were Rutherford's foil?
The Process:
Convert thickness from mm to cm.
[tex]\boxed{ \ 8 \times 10^{-3} \ mm = 8 \times 10^{-3} \times 10{-1} \ cm \ } \rightarrow \boxed{ \ 8 \times 10^{-4} \ cm \} [/tex]
The number of atoms is calculated from gold foil thickness divided by the atomic diameter.
[tex]\boxed{ \ = \frac{8 \times 10^{-4} \ cm}{2.9 \times 10^{-8} \ cm} \ }[/tex]
[tex]\boxed{ \ =2.7586 \times 10^4 \ atoms \ }[/tex]
Therefore, we get an atomic thickness of 27,586 atoms.
Notes:
In 1909-1910, Ernest Rutherford with two of his assistants, namely Hans Geiger and Ernest Marsden, conducted a series of experiments to find out more about the arrangement of atoms. They fired at a very thin gold plate with high-energy alpha particles. One of their observations is that a small portion of alpha particles are reflected. This greatly surprised Rutherford. The reflected alpha particle must have hit something very dense in the atom. This fact is incompatible with the atomic model proposed by J.J. Thomson where the atoms are described as homogeneous in all parts with electrons and protons evenly distributed. In 1911, Rutherford was able to explain the scattering of alpha rays by proposing ideas about atomic nuclei. According to him, most of the mass and positive charge of atoms are concentrated at the center of the atom, hereinafter referred to as the nucleus.Learn moreThe energy density of the stored energy https://brainly.com/question/9617400 The theoretical density of platinum which has the FCC crystal structure. https://brainly.com/question/5048216Compound microscope https://brainly.com/question/4000241Keywords: if a single gold atom, has a diameter of 2.9 x 10⁻⁸ cm, how many, atoms thick, Rutherford's foil, his scattering experiment
Rutherford’s foil was [tex]\boxed{{\text{27586 atoms}}}[/tex] thick.
Further Explanation:
Rutherford’s experiment:
Alpha particles were used by Rutherford in his experiment for demonstrate the structure of atom. This experiment was put forward to overcome the drawbacks of Thomson’s atomic model.
Postulates of Rutherford’s experiment:
1.Atom’s positive charge is located in very small volume and this is called atomic nucleus. It is the central part of any atom.
2.Electrons are allowed to revolve around atomic nucleus in definite orbits.
3.There is strong electrostatic force of attraction between electrons and atomic nucleus.
Drawbacks of Rutherford’s experiment:
1.This model did not provide any description about the distribution of electrons in orbits.
2.Stability of atom was not explained.
3. It failed to explain Maxwell’s theory of electromagnetic radiation.
We know, thickness of gold foil that was used by Rutherford in his experiment was [tex]8 \times {10^{ - 3}}{\text{ mm}}[/tex].
The thickness of gold foil is converted from mm to cm. The conversion factor for this is,
[tex]1{\text{ mm}} = {10^{ - 1}}{\text{ cm}}[/tex]
Therefore thickness of gold foil can be calculated as follows:
[tex]\begin{aligned}{\text{Thickness of gold foil}} &= \left( {8 \times {{10}^{ - 3}}{\text{ mm}}} \right)\left( {\frac{{{{10}^{ - 1}}{\text{ cm}}}}{{1{\text{ mm}}}}} \right) \\&= 8 \times {10^{ - 4}}{\text{ cm}} \\\end{aligned}[/tex]
Diameter of single gold atom is given as [tex]2.9 \times {10^{ - 8}}{\text{ cm}}[/tex]. Therefore number of gold atoms can be calculated as follows:
[tex]\begin{aligned}{\text{Number of gold atoms}} &= \frac{{8 \times {{10}^{ - 4}}{\text{ cm}}}}{{2.9 \times {{10}^{ - 8}}{\text{ cm}}}} \\&= 27586.2{\text{ atoms}} \\& \approx {\text{27586 atoms}} \\\end{aligned}[/tex]
Hence Rutherford’s foil used in the gold-foil experiment was 27586 atoms thick, provided the diameter of single gold atom is [tex]2.9 \times {10^{ - 8}}{\text{ cm}}[/tex].
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Answer details:
Grade: High School
Subject: Chemistry
Chapter: Atomic Structure
Keywords: Rutherford, atom, drawbacks, gold atoms, alpha particles, 27586 atoms, thick, Rutherford’s foil, diameter.
A mother calls you to ask about a proper dosage of cough medicine for her 2-year-old. The bottle says to administer 5.0mg/kg three times a day for children under 3 years of age. The cough syrup is supplied in a liquid that contains 50.0mg/mL.
Final answer:
To calculate the proper dosage of cough medicine for a 2-year-old child, you need to know their weight. The dosage is 5.0 mg/kg, so you can calculate the dosage by multiplying the weight of the child in kilograms by 5.0 mg. The cough syrup is supplied in a liquid that contains 50.0 mg/mL, so you need to convert the dosage into milliliters.
Explanation:
To calculate the proper dosage of cough medicine for the 2-year-old child, you need to know the weight of the child. Let's assume the child weighs 10 kilograms. The dosage is 5.0 mg/kg, so for a 10-kilogram child, the proper dosage would be 50.0 mg per dose. However, the cough syrup is supplied in a liquid that contains 50.0 mg/mL, so you need to convert the dosage into milliliters.
Since the syrup has a concentration of 50.0 mg/mL, you would need 1 milliliter of syrup to achieve a dosage of 50.0 mg. Therefore, the proper dosage of cough medicine for the 2-year-old child would be 1 milliliter of syrup per dose, three times a day.
During the process of _____, gas loses heat and changes into a liquid.
How to tell which ionic bond is stronger bacl2 lif nabr or ki?
Why are metals good conductors of electrical current?
A. Electrons can flow freely in metals.
B. Electrons can be permanently transferred from one metal atom to another.
C. Electrons stay in fixed positions in metals.
D. Electrons are often shared between two metal atoms.
Periodic table is divided into three metals, non metals and metalloids. The metals are kept on the left side of the periodic table. The correct option is option A.
What are non metals?Metals are the element that have property to loose electron. The examples of non metals are sodium, potassium, Aluminum, copper etc.
The properties of metals are:
Metals are not soft.
Metals are malleable that is they can be broken into thin sheets.
Metals are ductile they can be broken into thin wires.
Metals are not brittle in nature that is they can not be broken down easily.
Metals are lustrous.
Metals conduct electricity as electrons can flow freely in metals.
Therefore, metals are good conductors of electrical current as Electrons can flow freely in metals. The correct option is option A.
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This is a model of a Chlorine atom. How likely is it that this atom would want to bond with another atom?
This atom is very likely to bond with another atom.
k12 student, hope i helped! good luck
You have a pure (24-karat) gold ring with mass 10.8 g. gold has an atomic mass of 197 g/mol and an atomic number of 79. part a how many protons are in the ring
Final answer:
To find the number of protons in a 10.8 g gold ring, calculate the number of gold atoms using the molar mass, then multiply that number by the atomic number of gold, which is 79.
Explanation:
The student is asking about the number of protons in a gold ring. Since gold has an atomic number of 79, every atom of gold contains 79 protons. To find the total number of protons in the ring, we need to calculate the number of gold atoms present in 10.8 grams of gold and then multiply that number by 79.
The molar mass of gold is 197 g/mol, which tells us one mole of gold atoms weighs 197 grams. The number of atoms in one mole, known as Avogadro's number, is 6.022 x 10^23. So, the calculation goes as follows:
Determine the moles of gold in the ring: Moles of gold = mass of gold / molar mass of gold = 10.8 g / 197 g/mol.Calculate the number of gold atoms: Number of atoms = moles of gold x Avogadro's number.Calculate the total number of protons: Total protons = number of gold atoms x 79.Mendeleev left several blank spaces in his original periodic table. what did those spaces represent? elements with unknown physical properties elements that did not fit into his pattern elements that had yet to be discovered elements with variable atomic masses
Answer:
these blank spots represented elements that had yet to be discovered.
3. What does Letter X and Y represent?