What are the periodic trends in atomic radius select all that are correct?
Actually we can see a lot of trends in the periodic table.
With regards to the atomic radius of the elements, going up to down there is an increasing pattern in the atomic radius.
While going left to right there is a decreasing pattern in the atomic radius.
Hence the smallest radius is on the upper right of the table.
Final answer:
Periodic trends in atomic radius indicate a decrease across a period due to increased nuclear charge pulling electrons closer, and an increase down a group due to the addition of electron shells. These trends result in the largest atoms being located in the lower left corner of the periodic table and the smallest in the upper right corner.
Explanation:
The question asks about the periodic trends in atomic radius. Atomic radius is a crucial concept in chemistry because it helps explain many properties of elements such as reactivity and bond length. Understanding these trends is fundamental for predicting and explaining chemical behavior.
Decrease Across a Period: Within a period, the atomic radius tends to decrease as the atomic number (Z) increases. This is because, across a period, electrons are added to the same energy level while the nucleus charges more positively, pulling electrons closer and resulting in a smaller atomic radius. For instance, going from potassium (K) to krypton (Kr), the radius decreases.
Increase Down a Group: Conversely, atomic radius increases as one moves down a group in the periodic table. This trend is due to the addition of electron shells as one moves to elements with higher atomic numbers, increasing the distance between the outer electrons and the nucleus. All alkali metals, for example, show an increase in atomic radius down the group.
In summary, atomic radii decrease from left to right across a row and increase from top to bottom down a column. Therefore, the largest atoms are found in the lower left corner of the periodic table, while the smallest are found in the upper right corner.
The fundamental frequency of a violin string is 440 hz. the frequency of its second harmonic is
The second harmonic of a violin string with a fundamental frequency of 440 hertz is 880 hertz.
The second harmonic of a violin string with a fundamental frequency of 440 hertz. In the context of string instruments, the term 'harmonic' refers to the frequencies at which the string naturally vibrates. These are integer multiples of the fundamental frequency.
The fundamental frequency (first harmonic) is given as 440 hertz. The second harmonic is twice the fundamental frequency. Therefore, the frequency of the second harmonic is:
2 x 440 hertz = 880 hertz
So, the correct answer is 880 hertz.
Complete question:
The fundamental frequency of a violin string is 440 hertz. The frequency of its second harmonic is ________.
1) 880 hertz
2) 220 hertz
3) 440 hertz
4) none of the above
A chemical bond formed when two atoms of the same element share electrons is a _________________ _________________ bond.
Layers of rock that bend can produce a downward fold known as a(n)
Answer:
Syncline
Explanation:
Synclines are the down folds that are constructed due to the compressive forces acting on a layer from both sides. It usually occurs in size ranging from a microscopic scale to a large megascopic scale. The oldest rocks are present at its outermost limb and the rocks become gradually younger toward its hinge area.
In an outcrop, the syncline and the anticline, both form simultaneously. The limbs that dip towards the trough of the fold indicate a syncline whereas the limbs that dips towards the crest are the anticline. The variation in the shape of these foldings (anticline and syncline) depends upon the intensity of the force.
What is the total amount of heat required to completely melt 347 grams of ice at its melting point?
after 252 days, a 12.0-g sample of the radioisotope scandium-46 contains only 1.5 g of the isotope. what is the half-life of scandium-46
What is an atom called when the number of neutrons changes?
When an atom's number of neutrons changes it becomes an isotope of the same element. Changes in the number of neutrons alter the atom's mass number but don't change the element type defined by the atomic number.
Explanation:An atom becomes a different isotope of the same element when the number of neutrons changes. The atomic number which determines the type of the element doesn't change because it is defined by the number of protons. However, changing the number of neutrons alters the mass number. For example, hydrogen typically has no neutrons,but if a neutron is added, it becomes Deuterium, an isotope of hydrogen. Another example can be seen in Carbon which usually has 6 neutrons in its most common form (Carbon-12), but if we add an extra neutron it becomes Carbon-13, another isotope. These isotopes, while having the same number of protons and electrons, thus exhibiting the same chemical properties have different physical properties.
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if a match were placed in the cone close to the barrel of the gas burner will it ignite
There are around muscles in the human body
640
250
100
Any molecule that contains only carbon, hydrogen, & oxygen atoms in a 1:2:1 ratio (e.g., c6h12o6) is a:
Final answer:
A molecule with carbon, hydrogen, and oxygen atoms in a 1:2:1 ratio, like C₆H₁₂O₆, is a carbohydrate, classified based on the stoichiometric formula (CH₂O)ₙ.
Explanation:
Any molecule that contains only carbon, hydrogen, & oxygen atoms in a 1:2:1 ratio, such as C₆H₁₂O₆, is classified as a carbohydrate. Carbohydrates are a group of organic molecules comprised of carbon (C, carbo-) and the components of water (H₂O, hydrate), which explains their name. The stoichiometric formula (CH₂O)ₙ represents carbohydrates, where n is the number of carbon atoms in the molecule. This ratio signifies that carbohydrates have a simple whole-number ratio of carbon to hydrogen to oxygen atoms, which is 1:2:1, making the empirical formula CH₂O. Scientists classify carbohydrates into three subtypes: monosaccharides, disaccharides, and polysaccharides, each differing in the number of sugar units and structural complexity.
how much work is done if an object is pushed a distance of 500 meters with a force of 30 newtons?
Ordinary household bleach is an aqueous solution of sodium hypochlorite. what is the molarity of a bleach solution that contains 32.4 g of sodium hypochlorite in a total volume of 499 ml?
The molar concentration of sodium hypochlorite solution is 0.8717 M.
What is molar concentration?Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.
The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.
In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.
To calculate molar concentration of sodium hypochlorite , substitute the given values in the given formula which is,
molar concentration=mass/molar mass×1 /volume of solution in liters.
=32.4/74.4×1/0.499=0.8717 M.
Thus, the molar concentration of sodium hypochlorite is 0.8717 M.
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Final answer:
To calculate the molarity of a bleach solution containing 32.4 g of sodium hypochlorite in a total volume of 499 ml, the mass of NaOCl is first converted to moles and then divided by the volume in liters, resulting in a molarity of 0.872 M.
Explanation:
The question asks for the molarity of a bleach solution that contains 32.4 g of sodium hypochlorite in a total volume of 499 ml. To find the molarity, we first need to convert the mass of sodium hypochlorite to moles using its molar mass (74.44 g/mol for NaOCl), and then divide by the volume of the solution in liters.
First, calculate the number of moles of NaOCl:
Number of moles = 32.4 g / 74.44 g/mol = 0.435 moles NaOClNext, convert the volume of the solution to liters:
Volume in liters = 499 ml / 1000 ml/L = 0.499 LFinally, calculate the molarity of the solution:
Molarity = number of moles / volume in liters = 0.435 moles / 0.499 L = 0.872 MThis bleach solution has a molarity of 0.872 M.
Why does an ionic compound conduct an electric current when the compound is melted but not when it is in the solid state?
There are two types of compound, covalent compound and ionic compound in chemistry, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Due to ease in movement of ions, melted ionic compound conduct electricity.
What is chemical Compound?Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.
Ionic compound are very hard. They have high melting and boiling point because of strong ion bond. When ionic compounds are in solid state the charged particles (ions) are not free to move but when in melted for, the ions are free to move. So, now they can conduct electricity.
Due to ease in movement of ions, melted ionic compound conduct electricity.
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When preparing a TLC slide of a reference standard material (RSM), a solvent or mixture of solvents is used to dissolve the RSM and transfer it into the TLC plate. How does its polarity affects the Rf of the RSM?
What are physical properties of 500 grams of butter
Is potassium iodide an electrolyte or nonelectrolyte?
There are several salts that function as electrolytes when melting in the absence of any solvent, such as sodium chloride, and other salts, like silver iodide, are electrolyte even in the solid form. Therefore, potassium iodide is an electrolyte.
What is electrolyte?In physics and chemistry, an electrolyte is a material that allows ions, which are negatively and positively charged particles, to dissociate. Ions move toward and are typically released at the positive and negative terminals (anode and cathode) of an electric circuit, etc.
Acids, bases, and salts that are dissolved in solvents like water or alcohol cause ionization, making them the most well-known electrolytes. Potassium iodide is an electrolyte.
Therefore, potassium iodide is an electrolyte.
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When is it necessary to draw a multiple bond in a lewis structure?
Final answer:
In Lewis structures, a multiple bond is drawn when it is necessary to satisfy the octet rule and complete the octet of each atom in the molecule.
Explanation:
In Lewis structures, a multiple bond is drawn when it is necessary to satisfy the octet rule and complete the octet of each atom in the molecule. The octet rule states that atoms tend to gain, lose, or share electrons in order to have a full outer shell of eight electrons. If a single bond does not provide enough electrons to complete the octet of an atom, a double or triple bond must be drawn.
For example, in the Lewis structure of carbon dioxide (CO2), each oxygen atom has six valence electrons and the carbon atom has four. To complete the octet of each oxygen atom and the carbon atom, a double bond must be drawn between the carbon and each oxygen, resulting in a total of four shared electrons.
In some cases, expanded octets can occur. This happens when the central atom in a molecule can accommodate more than eight electrons in its outer shell. An example of this is sulfur hexafluoride (SF6), where sulfur has six bonding pairs of electrons and can accommodate twelve valence electrons in total.
Which of the following is a homogeneous mixture of two or more pure substances? Water alcohol coffee mercury
i think coffee
is the answer
The homogenous mixture here is water. The correct option is A.
What is homogenous mixture?A homogeneous mixture is one in which the composition is consistent throughout. Because the dissolved salt is evenly distributed throughout the salt water sample, the salt water described as homogeneous.
Steel, air, sugar water, and blood plasma are all examples of homogeneous mixtures.
A homogeneous mixture is one that has the same composition and appearance throughout.
Its constituents are evenly distributed throughout the substance. Solids, liquids, and gases can all be homogeneous mixtures.
Water is another example of a homogeneous mixture; all but the purest water contains dissolved minerals and gases; these are dissolved throughout the water, so the mixture is homogeneous and presents in the same phase.
Thus, the correct option is A.
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What kind of ions do acids release when dissolved in water?
What is the number of valence electrons in the outermost energy level of an element in goup 15a?
A substance that cannot be separated into simpler substances by physical or chemical means is a
An element is a substance that cannot be separated into simpler substances by physical or chemical means.
Explanation:A substance that cannot be separated into simpler substances by physical or chemical means is called an element.
Elements are the basic building blocks of matter. They are represented by symbols and are organized in the periodic table.
For example, gold (Au) and oxygen (O) are elements that cannot be broken down into simpler substances.
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The concentration of calcium in a cell is 3%. the concentration of calcium in the surrounding fluid is 1%. how could the cell obtain more calcium?
Fertilization is considered complete when this event occurs. see section 21.1 ( page 482)
What determines the crystal structure of an ionic compound?
The crystal structure of ionic compounds is primarily influenced by the relative sizes of the ions and the ratio of cations to anions. Ionic compounds with similar ion sizes and stoichiometries tend to form similar crystal structures. Other factors like lattice energy and covalent character also play a role.
The crystal structure of an ionic compound is determined primarily by two factors: the relative sizes of the ions, and the stoichiometry or the ratio of the numbers of positive and negative ions in the compound. These structures come about when ions of one charge are surrounded by as many ions as possible of the opposite charge, and when the cations and anions are in contact.
Additionally, ionic crystals are characterized by having alternating positively-charged cations and negatively-charged anions which may either be monatomic or polyatomic. Ionic compounds often crystallize in similar structures when their ions are of similar sizes and their stoichiometries match. Other considerations in determining the crystal structure include the lattice energy, which is influenced by factors such as covalent character and electron-electron interactions within ionic solids.
What kind of chemist was Friedrich Wohler?
a. exochemist
b. analytical chemist
c. physical chemist
d. organic chemist
Answer:
Friedrich Wöhler (German: [ˈvøːlɐ]) FRS(For) HFRSE (31 July 1800 – 23 September 1882) was a German chemist, known for his work in inorganic chemistry, being the first to isolate the chemical elements beryllium and yttrium in pure metallic form.
Died: 23 September 1882
Born: 31 July 1800, Eschersheim, Germany
Nationality: Germany
Explanation:
Is mixing a peanut,pretzel and cereal mixture chemical or physical change?
A train travels 93 kilometers in 4 hours, and then 93 kilometers in 1 hours. What is its average speed?
How many periods does the modern periodic table have?
Which element has three unpaired electrons in its p orbital? carbon (atomic number 6) oxygen (atomic number 8) nitrogen (atomic number 7) beryllium (atomic number 4)
Answer: The correct answer is Nitrogen.
Explanation:
Electronic configuration is the representation which helps in determination of the total number of electrons and valence electrons that are present in an element.
For the given options:
Option 1: Carbon having atomic number 6
Electronic configuration of C = [tex]1s^22s^22p^2[/tex]
It has 2 electrons in its p-orbital.
Option 2: Oxygen having atomic number 8
Electronic configuration of O = [tex]1s^22s^22p^4[/tex]
It has 4 electrons in its p-orbital.
Option 3: Nitrogen having atomic number 7
Electronic configuration of N = [tex]1s^22s^22p^3[/tex]
It has 3 electrons in its p-orbital.
Option 4: Beryllium having atomic number 4
Electronic configuration of Be = [tex]1s^22s^2[/tex]
It has 0 electrons in its p-orbital.
From the above information, the correct answer is Nitrogen.
Nitroglycerin has a formula c3h5(no3)3. the molar mass of nitroglycerin is
Nitroglycerin has a formula (C₃H₅(NO₃)₃), the molar mass of nitroglycerin is 227.11 g/mol.
To calculate the molar mass of nitroglycerin (C₃H₅(NO₃)₃), we need to find the molar masses of each element and then add them up.
The molar mass of each element is as follows:
C (Carbon) = 12.01 g/mol
H (Hydrogen) = 1.01 g/mol
N (Nitrogen) = 14.01 g/mol
O (Oxygen) = 16.00 g/mol
Now, let's calculate the molar mass of each component in nitroglycerin:
3 carbon atoms (C) = 3 x 12.01 g/mol = 36.03 g/mol
5 hydrogen atoms (H) = 5 x 1.01 g/mol = 5.05 g/mol
3 nitrogen atoms (N) = 3 x 14.01 g/mol = 42.03 g/mol
9 oxygen atoms (O) = 9 x 16.00 g/mol = 144.00 g/mol
Next, add up the molar masses of all the elements:
Molar mass of nitroglycerin = 36.03 g/mol + 5.05 g/mol + 42.03 g/mol + 144.00 g/mol
Molar mass of nitroglycerin = 227.11 g/mol
So, the molar mass of nitroglycerin is approximately 227.11 grams per mole (g/mol).
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