Answers
Answer:
K > Ca > Ge > Kr
Explanation:
The elements given are all in the 4th period on the periodic table.
Kr, k, Ge, Ca;
Arranging their order from left to right;
K, Ca, Ge, Kr
Atomic radius is taken as half the of the inter-nuclear distance (d) between two covalently bonded atoms of non-metallic elements or half the distance between two nuclei in the solid state of metals.
Across the periodic table atomic radii decreases progressively from left to right. This is due to progressive increase in the nuclear charge (number of protons in the nucleus) without an attendant increase in the number of electronic shells.
From the left to right; decreasing radii;
K > Ca > Ge > Kr
Related Questions
what is the formula for hydrochloric acid
Answers
HCL
The formula for Hydrochloric Acid is HCL.
Hope this helps and please consider marking branliest.
Which one of the following compounds
contains ionic bonds?
a) NI3
B) HF
c) SiO2
d) CaO
Answers
Your answer is CaO.I hope that my answer helped you..
Which formula is the mathematical representation of Charles’s law?P1V1 = V2/T2P1V1 = P2V2V1/T1 = V2/T2P1/T1 = P2/T2
Answers
Answer:
V1/T1 = V2/T2.
Explanation:
Let's remember Charles's Law: Charles's Law states that the volume of a given mass of gas varies directly with the absolute temperature of the gas when pressure is kept constant.
Wher
Mathematically, this can be described like this:
\(\frac{V}{T}=k.\)We can use Charles's Law to compare changing conditions of gases, like this:
\(\frac{V_1}{T_1}=\frac{V_2}{T_2}.\)Where V is volume, T is the temperature, subindex 1 indicates the initial conditions, and subindex 2 indicates the final conditions.
The answer would be V1/T1 = V2/T2.
A buret dispenses 16.4 mL of a 0.521 M NaOH solution. How many moles of NaOH were dispensed?
Answers
The number of moles will be 8.54 mole.
The concentration can be expressed as the ratio of number of mole and volume . It can be shown as:
C= n/V
where, C is concentration, n is number of moles and V is volume.
The given data:
C = 0.521 M
V = 16.4 mL
n = ?
The number of moles can be determined by using the formula:
C = n/v
n = C×v....(i)
Put the values of given data in above equation.
n = 0.521 × 16.4
n = 8.54
Therefore, the number of moles will be 8.54 mole.
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What are the charges of the ions in an ionic compound containing cobalt(III) and fluoride ions?
Write the formula for the compound.
Answers
The charge on the ions in an ionic compound containing cobalt(III) and fluoride ions is Co³⁺ and F⁻¹ and the formula of the compound is CoF₃.
Ionic compounds are a type of chemical compound where the oppositely-charged ions of a metal and a nonmetal are attracted to each other to form an ionic bond.
The compound formed from the bonded ions will have very different properties from the elements that make up the compound.
While atoms are neutral because they have an equal number of protons and electrons, ions have a net charge and result when an atom loses or gains electrons.
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The argon atoms are excited into an excited state before emitting the 488.0 nm laser. It is known that the energy of the first ionization energy of argon is 1520 kJ mol-1. What is the energy level of the excited state (in unit eV) lies below the vacuum energy level (0 eV)
Answers
Answer:
Explanation:
Given that:
The argon atoms are excited into an excited state before emitting the 488.0 nm laser.
the energy of the first ionization energy of argon is 1520 kJ mol-1.
SInce 1 eV = 96.49 kJ/mol
Therefore, the energy of the first ionization energy of argon in eV is = ( 1520/ 96.49) eV
= 15.75 eV
To find where the energy level of the excited state lies below the vacuum energy level, let's first determine, the energy liberated by using planck expression.
\(E = \dfrac{hc}{\lambda}\)
\(E = \dfrac{6.6 \times 10^{-34} \times 3 \times 10^8}{488 \times 10^{-9}}\)
\(E = \dfrac{1.98 \times 10^{-25}}{488 \times 10^{-9}}\)
\(E = \dfrac{1.98 \times 10^{-25}}{488 \times 10^{-9}}\)
\(E =4.057 \times 10^{-19} \ J\)
Converting Joules (J) to eV ; we get,
\(E =\dfrac{4.057 \times 10^{-19}}{1.6 \times 10^{-19}}\)
E = 2.53 eV
The energy levels of the first exited state = -13.223 eV
Which object will have the greatest gravitational pull?
Question 5 options:
Venus
Sun
Earth
Moon
Answers
Answer:
the sun i think because the sun has the greatest gravitational pull
Describe one limitation of geothermal energy?
Answers
what is the best way to learn and understand high school chemstry?
Answers
Answer:
Firstly, try to Go through your chapter and pay attention to main keywords.
secondly try to watch 'Uube' videos related to specific topic instead of chapter and pay attention to it closely and watch it with a keen interest.
Discuss topics that you find harder with your friends or peer group members, Because you learn faster when you study with the people of your age.
Answer:
i think the best way to learn chemistry is study over things that involve it
Explanation:
Define biotechnology. } List two advantages in the use of biotechnology
Answers
Advantages of biotechnology:
Improvement of plants and animal breeds to give a high yield of their products.
Pests and pathogen control in agriculture which will reduce the loss of yield in food crops.
Synthesis of biocatalyst which can be used for enhancing the reactions which can be carried out in vitro or laboratory conditions.
Sewage treatment or water recycling can be done with the help of transgenic microbes which have better efficiency and speed.
Biotechnology is the use of living organisms or other biological systems in the manufacture of drugs or other products or for environmental management, as in waste recycling: includes the use of bioreactors in manufacturing, microorganisms to degrade oil slicks or organic waste, genetically engineered bacteria to produce human hormones, and monoclonal antibodies to identify antigens.
Biotech offers the possibility of improving human health, the environment, and agriculture while creating more sustainable modes of production.
Which of the following is a redox reaction?
A. Single Replacement
B. Double Replacement
C. Acid/Base reaction
D. Precipitation reaction
Answers
Answer:
acid base reaction this is answer
Answer:
Double replacement .....
lewis electron dot notation
Answers
Lewis electron dot notation is a method for representing the valence electrons in an atom. In this notation, the valence electrons are shown as dots around the symbol of the element. The number of dots represents the number of valence electrons.
The Lewis electron dot notation is a useful tool for understanding the chemical behavior of elements. It allows us to see how many valence electrons an atom has and how they are distributed. This information can be used to predict the types of chemical bonds that an atom is likely to form. For example, the Lewis electron dot notation for nitrogen is:
N: ·
Nitrogen has five valence electrons, so there are five dots around the symbol.
In addition to representing individual atoms, the Lewis electron dot notation can also be used to represent molecules. In a molecule, the dots represent the shared electrons between the atoms. The Lewis electron dot notation is an important concept in chemistry that helps us to understand the properties and behavior of atoms and molecules.
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What medal has the highest volume?
Answers
The Medal of Honor is the best navy decoration and highest volume.
The President of the USA The Victoria go is the holy grail for Medal of Honor creditors because there are the best in lifestyles. Bearing the inscription For valor and called a VC, this medal turned into first offered for conspicuous bravery' in 1856 and later backdated to the Crimean conflict of 1854. The outstanding service pass is the second maximum army ornament that may be provided to a member of the American military, for intense gallantry and risk of lifestyle in actual combat with an armed enemy force.
The Bronze Star Medal dates lower back to world battle II. these days, it is the fourth-maximum ranking award a provider member can obtain for a heroic and meritorious deed performed in an armed battle. For individuals who acquire the BSM, it's far a sign of their sacrifice, bravery, and honor at the same time as serving their us of a
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Arteries do not contain muscle of any type.
True or False?
Answers
False.
Arteries are said to be more muscular.
That means Arteries ARE* MUSCLES
HELP IS NEEDED RIGHT NOW!!!!!!
Answers
1. Eukaryotes and Prokaryotes: I have a cell membrane (plasma membrane)
2. Eukaryotes: I have nucleus
3. Prokaryotes: Bacteria are an example of me
4. Eukaryotes: Fungi are an example of me.
5. Eukaryotes: Animals are an example of me.
6. Eukaryotes: I contain ribosomes.
7. Eukaryotes: I contain membrane-bound organelles.
8. Eukaryotes and Prokaryotes: I contain cytoplasm.
9. Eukaryotic cell: Your body cells are made of this type of cell.
10. Eukaryotes: Protists are an example of me.
11. Eukaryotes: Plants are an example of me.
12. Eukaryotes and Prokaryotes: I contain genetic material such as DNA.
What are Eukaryotes and Prokaryotes?Prokaryotes are organisms that are composed of cells that do not have a cell nucleus or any membrane-encased organelles.
Eukaryotes are organisms that are composed of cells that have a cell nucleus or any membrane-encased organelles.
An example of a prokaryote is bacteria. Fungi are an example of a eukaryote.
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Which products are the result of a neutralization reaction? (1 point)
A)hydrogen and hydroxide
B)water and a salt
C)a titrant and an analyte
D)an acid and a base
Answers
Answer:
B) water and salt is the result of neutralization reaction
Water and salts are the product of a neutralization reaction.
NEUTRALIZATION REACTION:
Neutralization reaction is a type of reaction between an acid and a base to form a salt and water. In a neutralization reaction, the hydrogen ion (H+) and hydroxyl ion (OH-) are released from the acid and base respectively and are combined to form water. An example is the reaction between hydrochloric acid (HCl) as an acid and sodium hydroxide (NaOH) as a base to form sodium chloride (NaCl) as salt and water (H2O). Therefore, water and salts are the product of a neutralization reaction.Learn more at: https://brainly.com/question/20038776?referrer=searchResults
When a solution is diluted with water, the ratio of the initial to final
volumes of solution is equal to the ratio of final to initial molarities
Select one:
True
-
Answers
The correct answer for this problem would be TRUE.
Explanation: it is true that when a solution is diluted with water, the ratio of the initial to final volumes of solution is equal to the ratio of final to initial molarities.
When a solution is diluted with water, the ratio of the initial to final volumes of solution is equal to the ratio of final to initial molarities. The statement is True.
Concentration refers to the amount of a substance in a defined space. Another definition is that concentration is the ratio of solute in a solution to either solvent or total solution.
There are various methods of expressing the concentration of a solution.
Concentrations are usually expressed in terms of molarity, defined as the number of moles of solute in 1 L of solution.
Solutions of known concentration can be prepared either by dissolving a known mass of solute in a solvent and diluting to a desired final volume or by diluting the appropriate volume of a more concentrated solution (a stock solution) to the desired final volume.
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how many moles are in 6.7 x 10^25 molecules of H2SO4
Answers
Answer:
\( \huge{ \boxed{111.30 \: \: \text{moles}}}\)
Explanation:
To find the number of moles in a substance given it's number of entities we use the formula
\( \bold{n = \frac{N}{L} \\ }\)
where
n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities.
From the question.
N = 6.7 × 10²⁵ \( \: H_2SO_4 \: \) molecules
\(n = \frac{6.7 \times {10}^{25} }{6.02 \times {10}^{23} } \\ = 111.2956...\)
We have the final answer as.
111.30 molesWhy are nutrient molecules important?
Answers
A nutrient is a substance used by an organism to survive, grow, and reproduce. The requirement for dietary nutrient intake applies to animals, plants, fungi, and protists. Nutrients can be incorporated into cells for metabolic purposes or excreted by cells to create non-cellular structures, such as hair, scales, feathers, or exoskeletons. Some nutrients can be metabolically converted to smaller molecules in the process of releasing energy, such as for carbohydrates, lipids, proteins, and fermentation products (ethanol or vinegar), leading to end-products of water and carbon dioxide. All organisms require water. Essential nutrients for animals are the energy sources, some of the amino acids that are combined to create proteins, a subset of fatty acids, vitamins and certain minerals. Plants require more diverse minerals absorbed through roots, plus carbon dioxide and oxygen absorbed through leaves. Fungi live on dead or living organic matter and meet nutrient needs from their host.
The irreversible isomerization A
B was carried out in a batch reactor and the following concentration time data were obtained:
Time vs Concentration data in a Batch reactor
t 0 3 5 8 10 12 15 7.5
mol/h 4 2.89 2.25 1.45 1.0 0.65 0.25 0.07
Determine the reaction order,
, and the specific reaction a rate constant, k, using any method of your choice.
Answers
The reaction order and specific reaction rate constant can be determined by performing the kinetics experiment on irreversible polymerization A. Kinetic experiments can be used to investigate the rate and mechanism of chemical reactions. Chemical kinetics is the study of chemical reactions' speed and pathway.
The term "kinetics" refers to the study of reaction rates, which are determined by measuring the concentration of reactants and products as a function of time.Kinetics experiments can be used to determine the reaction rate and order of reaction. A chemical reaction's rate is defined as the change in the concentration of a reactant or product per unit time. The order of a reaction refers to the number of molecules that must react to produce a product. The order of reaction can be determined by measuring the initial rate of the reaction as a function of concentration.Methods for determining the reaction rate order include the initial rate method, the half-life method, and the integrated rate method. The initial rate method determines the reaction order by measuring the initial rate of the reaction at different reactant concentrations. The half-life method determines the reaction order by measuring the time it takes for the reactant concentration to decrease by half.The integrated rate method determines the reaction order by measuring the concentration of the reactant or product at different times.The specific rate constant can be determined by using the Arrhenius equation, which relates the rate constant to the activation energy, temperature, and frequency factor. The frequency factor can be determined by measuring the rate constant at different temperatures.For such more question on polymerization
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Enter the cycle number, n, in the x column and the number of radioactive atoms in the y column. When you finish, resize the window.
Answers
Explain why the Jobs method works in determining the formula of a salt.
Answers
The Jobs method works because the ratio of the cations to the anions in a salt is fixed and can be determined by measuring the mass of the precipitate formed when the salt is reacted with a known quantity of a reagent.
What is Job?
In the context of chemistry, the "Jobs method" refers to a chemical technique used to determine the empirical formula of a salt. It is named after its inventor, Zdenko Hans Skraup Job (1865-1933), who was an Austrian chemist and professor of chemistry at the University of Prague.
Job is best known for his work on the synthesis and properties of organic compounds, particularly his research on indole derivatives and alkaloids. He also made important contributions to the field of physical chemistry, including the development of the Jobs method for determining the empirical formula of a salt.
The Jobs method is a chemical technique used to determine the empirical formula of a salt. It involves finding the ratio of the cations and anions in the salt by taking advantage of the precipitation reaction that occurs between the salt and a known amount of a reagent that forms an insoluble product with one of the ions in the salt.
The general steps of the Jobs method are as follows:
A known quantity of the salt is dissolved in water to form a solution.
A known quantity of a reagent is added to the solution, which reacts with one of the ions in the salt to form an insoluble precipitate.
The precipitate is filtered and dried, and the mass is measured.
The mass of the precipitate is used to calculate the moles of the ion that reacted with the reagent.
The ratio of the moles of the cation to the moles of the anion is calculated.
The ratio is then simplified to the smallest whole number ratio to determine the empirical formula of the salt.
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how many liters of water are needed to prepare 756 g of CaCO3 for a 3.50 M solution? MM=100.1 grams/mole
Answers
The volume of water needed to prepare the solution given the data is 2.16 L
What is molarity?This is defined as the mole of solute per unit litre of solution. Mathematically, it can be expressed as:
Molarity = mole / Volume
How to determine the mole of CaCO₃Mass of CaCO₃ = 756 g Molar mass of CaCO₃ = 100.1 g/mol Mole of CaCO₃ =?Mole = mass / molar mass
Mole of CaCO₃ = 756 / 100.1
Mole of CaCO₃ = 7.55 moles
How to determine the volume Mole of CaCO₃ = 7.55 molesMolarity = 3.5 MVolume = ?Volume = mole / molarity
Volume = 7.55 / 3.5
Volume = 2.16 L
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What might happen if water molecules did not have a slight negative charge on one end and a slight positive charge on another
Answers
Water molecules did not have a slight negative charge on one end and a slight positive charge on another, the loss of polarity would have profound effects on various biological, chemical, and physical processes. The unique properties of water that are vital for life as we know it would be significantly altered, potentially rendering many biological systems nonfunctional and disrupting the stability of ecosystems.
Loss of hydrogen bonding: The polarity of water molecules allows them to form hydrogen bonds with each other and with other polar substances.Hydrogen bonds are relatively weak but essential for various biological processes, including protein folding, DNA structure, and the stabilization of cell membranes. Altered solubility: Water's polarity contributes to its excellent solvent properties. It can dissolve a wide range of substances, including salts, sugars, and polar molecules, due to its ability to surround and separate charged or polar particles. Changes in boiling and freezing points: The polarity of water affects its boiling and freezing points. Water has a relatively high boiling point and melting point compared to other substances of similar molecular weight. Altered surface tension: Surface tension is the cohesive force that holds the surface of a liquid together. Water exhibits relatively high surface tension due to the cohesive forces between water molecules resulting from their polarity. Changes in heat capacity: Water's ability to absorb and retain heat is crucial for temperature regulation in many organisms and helps moderate temperature changes in the environment.For such more question on Water molecules
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1. Consider the following mechanism. [4 Marks]
03 O2 + 0 (fast)
03+0202 (slow)
(a) Write the overall balanced chemical equation.
(b) Identify any intermediates within the mechanism.
(c) What is the order with respect to each reactant?
(d) Write the rate law for the overall reaction.
Answers
Consider the following mechanism.
The overall balanced chemical equation : 2O₃ ----> 3O₂
The intermediates within the mechanism : O
The order with respect to each reactant : 2
The rate law for the overall reaction : R = k[O₃]²/[O]
The equations are :
O₃ ----> O₂ + O fast
O₃ + O ---> 2O₃ slow
a) The overall reaction is given as :
2O₃ ----> 3O₂
b) The intermediates within the mechanism is O.
c) The order with respect to each reactant is 2
d) slow step rate : k[O][O₃]
at equilibrium, kc = [O][O₂] / [O₃]
The rate law = R = k[O₃]²/[O]
Thus, Consider the following mechanism.
The overall balanced chemical equation : 2O₃ ----> 3O₂
The intermediates within the mechanism : O
The order with respect to each reactant : 2
The rate law expression for the reaction : R = k[O₃]²/[O]
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Which statement describes how the binary ionic compound KBr is named?
Answers
Which statement describes how the binary ionic compound KBr is named? The metal is named first, and the name is unchanged. Which of these is a property of a substance that is composed of atoms that are held together by ionic bonds?
B. The metal is named first and the name is unchanged.
The density of ethanol is 0.789 g/cm^3. A flask holds 165.0 g of ethanol. What is the volume of the ethanol?
a. 4.78 x 10^-3 g
b. 130. g
c. 209 g
Answers
The volume of the ethanol that has a density of ethanol is 0.789 g/cm³ is 209.13cm³.
How to calculate volume?The volume of a substance can be calculated by dividing the mass of the substance by its density as follows:
Volume = mass ÷ density
According to this question, the density of ethanol is 0.789 g/cm³. A flask holds 165.0 g of ethanol and the volume can be calculated as follows:
Volume = 165.0g ÷ 0.789g/cm³
Volume = 209.13cm³
Therefore, the volume of the ethanol that has a density of ethanol is 0.789 g/cm³ is 209.13cm³.
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Margaret has a phobia of elevators. Dr. Trane believes that her phobia stems from her unconscious desire for sexual intercourse. Dr. Uni believes that her phobia stems from the time she was stabbed while riding an elevator, which is now associated with extreme fear. Dr. Trane's explanation is based on the __________ perspective while Dr. Uni's explanation is based on the __________ perspective.
Question 11 options:
behavioral; psychodynamic
psychodynamic; cognitive
psychodynamic; behavioral
humanistic; behavioral
Answers
Dr. Trane's explanation is based on the psychodynamic perspective while Dr. Uni's explanation is based on the behavoiural perspective. The correct option is option C.
What is Psychodynamic PerspectivePsychodynamic perspective is a psychological approach that focuses on the unconscious mind and how it affects the behavior. According to the psychodynamic perspective, unconscious urges and conflicts that have their roots in early experiences shape how people behave. This approach is developed by Sigmund Freud.
Behavioral perspective
This is the psychological approach that focuses on observable behavior and the influence of the environment on an individual's actions. According to behaviorists, who also emphasize the significance of understanding and influencing behavior without probing interior mental processes, behavior is learnt through interactions with the environment. The early behaviourists are J.F Skinner, John B. Watson and Ivan Pavlov.
These perspectives are parts of psychoanalysis.
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Which solution is used to test for protein in food?
Answers
A runner exerting a running force of 325 N to the right is met with an air resistance force of 45 N to the left. What is the net
force of the runner? (1 point)
O 45 N
O 280 N
O 370 N
O 325 N
Answers
The net force of the runner, given the data from the question is 280 N
Data obtained from the questionFrom the question given above, the following data were obtained:
Exerting force = 325 NResistance force = 45 NNet force =?How to determine the net forceThe net force of the runner can be obtained as illustrated below:
Net force = Exerting force - resistance force
Net force = 325 - 45
Net force = 280 N
From the calculation made above, we can conclude that the runner's net force is 280 N
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The net force of the runner would be 280 N.
Hope this helps! Also, if you need help with the other questions regarding this assignment, feel free to check out the study set I made on Quizlet. Thanks and good luck!
Quizlet - "Unit 6: Lesson 2 Newton's First Law QC"
h t t p s : / / q u i z l e t. c o m / 7 3 7 7 5 9 5 5 5 / u n i t - 6 - l e s s o n - 2 - n e w t o n s - f i r s t - l a w - f l a s h - c a r d s / ? n e w