In which direction on the periodic table, horizontal or vertical, are elements with similar chemical properties aligned? what are families of elements with similar chemical properties called?
Elements in the periodic table that has similar chemical properties are been arranged in vertical direction , and families of these elements are regarded as group.
The vertical aliment of the elements in the periodic table are this elements that posses similar properties.Elements in the same group do have similar chemical properties, for instance Sodium and potassium belongs to alkali metals, they are from s-block. They posses chemical properties like high reactivity, they are ready in loosing their outmost electron so they can form cations along with charge, they always appear as silvery substanceThe numbering of the Groups is from 1 to 18. If we move from left to right, we have group 1 and 2 which are elements in the s- block, then there are ten groups moving from 3 through 12 in the transition block(d- block) then six groups if we move through 13 and 18 in main block.Hence, families of these elements are regarded as group.
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Which of the following sciences is NOT a sub-field of Earth Science?
a. Oceanography
b. Vulcanology
c. meteorology
d. Botany
what are the inferred pressure and temperature at the boundary of earths stiffer mantle and outer core
The inferred pressure and temperature at the boundary of Earth's stiffer mantle and outer core are very high, reaching up to several million atmospheres and exceeding 5000 degrees Celsius, respectively.
Explanation:At the boundary between Earth's stiffer mantle and outer core, the pressure and temperature are very high due to the immense weight and heat of the overlying material. The pressure can reach up to several million atmospheres, while the temperature can exceed 5000 degrees Celsius. These extreme conditions are necessary to maintain the liquid state of the outer core and the solid state of the inner core.These extreme conditions are necessary to maintain the liquid state of the outer core and the solid state of the inner core.These extreme conditions are necessary to maintain the liquid state of the outer core and the solid state of the inner core.
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Which state of matter characterized by having a definite shape and a definite volume?
Answer:
the correct answer is indeed solid
Explanation:
solids have compressed matter making them have a definite shape and volume
most bacteria are
A.unicellular eukaryotes
b. unicellular prokaryotes
c,multicellular eukaryotes
d, multicellular prokaryotes
Answer:
b. unicellular prokaryotes
Explanation:
Most of the bacteria are primitive organisms that is why they are not very advanced in terms of cellular organelles and body functions. They do not have high level of organization in their body like presence of tissues, organs, organ systems etc. because they are only single celled organisms that is why they are known as unicellular organisms. A single cell performs all the functions required to sustain life. Their genetic material is very primitive type of structure which does not have any nuclear membrane or nuclear envelop. It is circular in shape and lies in the cytoplasm and it is known as nucleoid instead of nucleus.
For example: E. coli.
The majority of bacteria are classified as unicellular prokaryotes, meaning they are composed of a single cell and lack a nucleated cell structure.
Explanation:Most bacteria are unicellular prokaryotes. Unicellular means that they are organisms composed of a single cell. Prokaryotes refer to organisms that do not have a nucleus and other specialized organelles in their cells, which is common in bacteria. One important distinction of prokaryotes, including bacteria, is that their DNA is not stored in a nucleus, unlike eukaryotes. In contrast, eukaryotes, whether unicellular or multicellular, have a nucleus to house their DNA in addition to other specialized organelles.
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The type of compound that is most likely to contain a covalent bond is ________.
The type of compound that is most likely to contain a covalent bond is A. one that is composed of only nonmetals.
Covalent bonds typically form between nonmetal atoms because they have similar electronegativities and tend to share electrons to achieve a full outer electron shell.Ionic bonds form between metals and nonmetals due to the transfer of electrons from the metal to the nonmetal, resulting in electrostatic attraction between oppositely charged ions.Metallic bonds occur between metal atoms where electrons are delocalized over a lattice of metal cations.Let's review the options:
A. one that is composed of only nonmetals: Correct. Nonmetals tend to share electrons, forming covalent bonds.
B. held together by the electrostatic forces between oppositely charged ions: This describes ionic bonds, not covalent bonds.
C. one that is composed of a metal from the far left of the periodic table and a nonmetal from the far right of the periodic table: This combination typically forms ionic bonds.
D. a solid metal: Metals form metallic bonds, not covalent bonds.
E. There is no general rule to predict covalency in bonds: Incorrect. There is a general rule; covalent bonds are usually formed between nonmetal atoms.
Thus, the correct answer is A.
Complete Question:
The type of compound that is most likely to contain a covalent bond is ________.
A. one that is composed of only nonmetals
B. held together by the electrostatic forces between oppositely charged ions
C. one that is composed of a metal from the far left of the periodic table and a nonmetal from the far right of the periodic table
D. a solid metal Incorrect
E. There is no general rule to predict covalency in bonds.
What is the density of hydrogen sulfide (h2s)?
The space around the nucleus of an atom where the atom's electrons are found is called the
The first ionization energy, e, of a potassium atom is 0.696 aj. what is the wavelength of light, in nm, that is just sufficient to ionize a potassium atom? values for constants can be found here.
The wavelength of light that is just sufficient to ionize a potassium atom is 656 nm.
Explanation:To solve this problem, we will utilize Planck's equation along with the photoelectric effect. Planck's equation is E = hv, where E is the energy, h is Planck's constant (6.62607015 x 10^-34 Js), and v is the frequency. The photoelectric effect says that a photon's energy must be larger than the binding energy (the ionization energy) to eject an electron from an atom.
The ionization energy of potassium is given in aj (atom Joules), but it will be more convenient to convert this into joules (J). 1 aj = 4.35974 x 10^-18 J, so the ionization energy e = 0.696 aj = 0.696 * 4.35974 x 10^-18 J = 3.03 x 10^-18 J.
We equate this to the energy of the photon (E=hv), then rearrange to find ν = E / h = (3.03 x 10^-18 J) / (6.62607015 x 10^-34 Js) = 4.57 x 10^15 Hz.
Then, using the formula c = λv, where c is the speed of light, we isolate λ, the wavelength, to find λ = c / v = (3.00 x 10^8 m/s) / (4.57 x 10^15 Hz) = 6.56 x 10^-8 m. As the question requested the answer in nanometers (nm), we convert this to obtain the final answer: 6.56 x 10^-8 m = 656 nm.
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Catalysts increase reaction rates by lowering the activation energy of a reaction.
a. True
b. False
What color element symbol designates elements that are a gas at a given temperature??
What is the mass of a glucose solution that fills a 1.00 l intravenous bottle if the density of the glucose solution is 1.15 g/ml?
Density is an intensive property as it does not depend on the quantity of the substances Whereas mass and volume are extensive property The mass of the glucose solution that fills a 1.00 l intravenous bottle is 1500g.
What is density?Density tells about the compactness of the substances, how much dense is the substances in other words. Object that is more denser than water they just sink in the water.
Mathematically,
Density = Mass of the glucose solution ÷volume of intravenous bottle
Volume of the intravenous bottle = 1.00l= 1.00 l*1000=1000ml
Density of glucose solution = 1.15 g/ml
Substituting all the values in above formula, we get
Mass of the glucose solution = Density*volume of intravenous bottle
Mass of the glucose solution =1.15 g/ml*1000ml
Mass of the glucose solution = 1500g
Therefore, the mass of the glucose solution that fills a 1.00 l intravenous bottle is 1500g.
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tooth fillings are often made of gold or porcelain because those materials are not what?
How many moles of hydrogen atoms are in 10.3 g of methane (ch4)?
The common pathway for the oxidation of glucose and fatty acids is ________.
Which description identifies the correct charge of each atomic particle?
A.
electron = positive; proton = negative; neutron = no charge
B.
electron = negative; proton = positive; neutron = no charge
C.
electron = no charge; proton = negative; neutron = positive
D.
electron = negative; proton = no charge; neutron = positive
Which element listed below would have chemical properties similar to fluorine?
Answer:
D
Explanation:
Bromine
How many moles of aluminum exist in 100.0 g of aluminum?
There are 3.7 moles in 100.0 g of aluminum
HOW TO CALCULATE NUMBER OF MOLES:
The number of moles contained in a substance can be calculated by dividing the mass of that substance by its molar mass. That is;no. of moles = mass ÷ molar mass
Molar mass of Aluminum = 27g/mol
no. of moles = 100g ÷ 27g/mol
no of moles = 3.703mol
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What is the formula for the ionic compound formed by magnesium and iodine?
For the fourth-shell orbital shown below, what are the principal quantum number, n, and the angular momentum quantum number, l
The principal quantum number, n, and the angular momentum quantum number, l, determine various properties of the orbital.
Explanation:The principal quantum number, n, determines the general range of energy and the probable distances that the electron can be from the nucleus. The angular momentum quantum number, l, determines the shape of the orbital. For a given value of l, the angular momentum projection quantum number m₁ can have specific values between -l and +l.
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The principal quantum number, n, determines the general range of energy and probable distances of an electron from the nucleus. The angular momentum quantum number, l, specifies the shape of the orbital and corresponds to the orbital's general shape.
Explanation:The principal quantum number, n, determines the general range of energy and probable distances of an electron from the nucleus. The angular momentum quantum number, l, specifies the shape of the orbital and corresponds to the orbital's general shape. For the fourth-shell orbital, the principal quantum number would be 4 and the angular momentum quantum number would be 0, 1, 2, or 3.
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Organisms do not adapt as a result of competition for resources. Please select the best answer from the choices provided T F
Organisms do not adapt as a result of competition for resources. Please select the best answer from the choices provided T OR F its FALSE
In an ecosystem organisms adapt as a result of competition for resources.Hence the given statement is false.
What is an ecosystem?Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.
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In a particular gravimetric analysis, the precipitate of caso4 was weighed before it was completely dried. the likely impact of this error on the calculated moles of caso4 will be:
Final answer:
Weighing CaSO₄ precipitate before it is completely dried will result in an overestimation of the moles and concentration of the analyte, known as a positive determinate error in gravimetric analysis.
Explanation:
If a precipitate of CaSO₄ was weighed before it was completely dried, the likely impact of this error on the calculated moles of CaSO₄ would be that the measured mass is higher than the true mass of the dry CaSO₄. This is because the precipitate would contain additional water, which contributes to the overall mass. Since the stoichiometric calculation of moles is based on the mass of the precipitate, having extra mass from the water will result in an overestimation of the moles of CaSO₄. Therefore, the calculated concentration of the analyte in the sample will also be higher than it should be. This type of error is termed a positive determinate error in gravimetric analysis and it affects not just the stoichiometry, but also the reported percentage purity or concentration of the analyte within the sample.
Lipids are made up of long hydrocarbon chains, composed of all carbon and hydrogen atoms. this characteristic makes lipids insoluble in water ("oil and water don't mix") because:
A 25.00 ml sample of hcl solution requires 34.30 ml of 8.670x10^-2m naoh solution to reach the end point. calculate the molarity of the hcl solution
Final answer:
The molarity of the HCl solution is 0.1174 M.
Explanation:
To calculate the molarity of the HCl solution, we can use the equation:
M1V1 = M2V2
Using the values given in the question:
M1 = Molarity of HCl solution = unknown
V1 = Volume of HCl solution = 25.00 mL = 0.025 L
M2 = Molarity of NaOH solution = 8.670x10^-2 M
V2 = Volume of NaOH solution = 34.30 mL = 0.0343 L
Plugging in these values into the equation, we get:
M1(0.025) = (8.670x10^-2)(0.0343)
M1 = (8.670x10^-2)(0.0343) / 0.025
M1 = 0.1174 M
Δh = -296 kj/mol (a) how much heat is evolved when 585 g sulfur is burned in excess o2
All atoms are neutral. explain the basis of this fact
How is the energy level of an atom's valence electrons related to the period in the periodic table?
Which naturally-occurring radioactive particles are negatively charged? 1. alpha particles 2. neutrons 3. gamma radiation 4. beta particles?
In Physics, of the listed naturally-occurring radioactive particles, beta particles carry a negative charge.
Explanation:In the field of Physics, there are several types of naturally-occurring radioactive particles, which include alpha particles, neutrons, gamma radiation, and beta particles. Of these, it is the beta particles that carry a negative charge. Alpha particles, on the other hand, are positively charged. Neutrons do not carry a charge. Finally, gamma radiation is actually a form of electromagnetic radiation, and thus, it also does not carry a charge.
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Products are what is created during a reaction what are the three products of cellular respiration
This process, known as cellular respiration, uses oxygen and glucose to produce ATP, carbon dioxide, and water. Since they are what is produced, ATP, carbon dioxide, and water are all byproducts of this process.
What three byproducts do cells produce during respiration?Oxygen and glucose are transformed into water and carbon dioxide during cellular respiration. By-products of the process include carbon dioxide, water, and ATP, which is turned into energy.
ATP and H2O are the last byproducts of cellular respiration. Two pyruvate molecules, four ATPs (a net of two ATP), two NADH, and two H2O are produced during glycolysis. Therefore, glycolysis is the only process that may take place in the absence of oxygen, and only two ATP molecules may be created for each glucose molecule.
Adenosine triphosphate (ATP), carbon dioxide, and water are the three byproducts of cellular respiration.
The Krebs cycle, also known as the citric acid cycle, electron transport, and glycolysis are the three processes that make up cellular respiration.
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In the reaction of fe3o4 with carbon to form carbon dioxide and iron, the number of moles of carbon required to convert 23 g of fe3o4 to products is