select true or false: the radii of ions are always smaller than the radii of the corresponding atoms of the same element.
Answers
The given statement about radii is false and the correct statement is only radii of cation are always smaller than radii of corresponding atoms of same elements.
Radii of anions are greater than its parent atoms due to the following reasons: 1. Size of anion is always greater than its parent atom because anions are formed due to gain of electrons. When electrons increases there are still same number of protons. The attractive force is thus reduced as there are same number of protons attraction increased number of electrons. This causes the electrons to not be bound as tightly to the nucleus resulting in an increase in size. 2. Size of cation is always smaller than its parent atom because as a particular atom looses electron, no of proton become more than no of electron and attraction forces increases. So radius decreases.
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Related Questions
sample was analyzed and was found to contain 12.12% of carbon 16.17% of oxygen 71.71% of chlorine What is its empirical formula
Answers
To determine the empirical formula of the sample based on the given percentages of carbon, oxygen, and chlorine, we need to convert the percentages into moles and find the simplest whole number ratio between the elements.
Convert the percentages to moles:
Assume we have 100 grams of the sample.
Carbon (C): 12.12 grams (12.12% of 100g)
Oxygen (O): 16.17 grams (16.17% of 100g)
Chlorine (Cl): 71.71 grams (71.71% of 100g)
Convert the grams to moles using the respective atomic masses:
Carbon (C): Atomic mass of carbon = 12.01 g/mol
Moles of carbon = 12.12 g / 12.01 g/mol = 1.009 moles
Oxygen (O): Atomic mass of oxygen = 16.00 g/mol
Moles of oxygen = 16.17 g / 16.00 g/mol = 1.010 moles
Chlorine (Cl): Atomic mass of chlorine = 35.45 g/mol
Moles of chlorine = 71.71 g / 35.45 g/mol = 2.024 moles
Find the simplest whole number ratio:
To determine the simplest whole number ratio, divide the number of moles of each element by the smallest number of moles:
Carbon: 1.009 moles / 1.009 moles = 1
Oxygen: 1.010 moles / 1.009 moles = 1
Chlorine: 2.024 moles / 1.009 moles = 2
The simplest whole number ratio is 1:1:2, indicating that the empirical formula of the sample is C1O1Cl2.
However, it is important to note that the empirical formula represents the relative ratio of atoms in the compound and does not provide information about the actual molecular formula or the arrangement of atoms within the molecule. Further analysis, such as molecular weight determination, is necessary to determine the molecular formula.
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which of the following substances acts as an anticoagulant?
A. Sodium chloride. B. Sodium citrate. C. Sodium nitrate. D. Ammonium chloride.
Answers
Anticoagulants are substances that prevent the blood from clotting by reducing the activity of clotting factors. Sodium citrate is one of the anticoagulants used in blood transfusions. The answer is option B.
As the question asks which of the following substances acts as an anticoagulant, so the correct answer is B. Sodium citrate. Sodium citrate is a naturally occurring sodium salt of citric acid. It is used in medical procedures, particularly for anticoagulation of blood in clinical laboratories and blood banks. Sodium citrate is a highly effective anticoagulant because it binds to the free calcium present in blood, which is necessary for the coagulation cascade to proceed. This reduces the amount of available calcium and thus inhibits blood clotting.
The answer is option B.
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Explain why having a thick, heavy chimney is a better idea than a thin, metal chimney for heating a home all winter long, especially overnight.
Answers
The major idea behind why having a thick, heavy chimney over a thin, metal chimney for heating a home for a longer period is because it retains a lot of heat and this means energy saving, hence it fuel efficient and cost effective
A metal is a good conductor of heat, this property will make it easily give out head that is needed to the surrounding especially at night, therefore a thick chimney especially made from clay material will be a better choice over a thin metal
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24. How many grams of NaCl are required to prepare 60ml of a 75% solution?
Answers
Considering the definition of mass volume percentage, a mass of NaCl of 45 grams is required to prepare 60ml of a 75% solution.
Definition of mass volume percentageA mass volume percentage is a ratio of the mass of a solute to the volume of the solution, expressed as a percentage. The mass/volume percentage is calculated as the mass of solute divided by the volume of solution:
mass volume percentage= (mass of solute÷ volume of solution)×100%
Mass of NaClIn this case, you know:
mass volume percentage= 75%mass of solute=?volume of solution= 60 mLReplacing in the definition of mass volume percentage:
75% grams/mL= (mass of solute÷ 60 mL)×100%
Solving:
75% grams/mL÷100%= mass of solute÷ 60 mL
0.75 grams/mL= mass of solute÷ 60 mL
0.75 grams/mL×60 mL= mass of solute
45 grams= mass of solute
Finally, a mass of NaCl of 45 grams is required.
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Uranium-235, uranium-238 and uranium-239 are different
A) elements.
B) ions of the same element.
C) isotopes of the same element.
D) none of the above
Answers
Answer:
C
Explanation:
they are of same element but different mass no.
in chemistry language we call them isotopes
What makes alcohols different from other organic molecules structurally?.
Answers
Alcohols contain hydroxyl (-OH) groups that are attached to carbon atoms in the molecule, which distinguishes them from other organic compounds structurally.
Organic molecules are those that contain carbon atoms, such as hydrocarbons, which only contain hydrogen and carbon atoms, and alcohols, which contain hydroxyl (-OH) groups that are attached to carbon atoms in the molecule. This distinguishes them from other organic compounds structurally.
Alcohols are classified based on the number of carbon atoms attached to the carbon atom that bears the hydroxyl group. The simplest alcohol is methanol, which has only one carbon atom, while the most common alcohol is ethanol, which has two carbon atoms attached to the carbon atom bearing the hydroxyl group.
Alcohols can be classified as primary, secondary, or tertiary depending on the number of alkyl groups attached to the carbon atom bearing the hydroxyl group. Primary alcohols have one alkyl group, secondary alcohols have two, and tertiary alcohols have three. In summary, the presence of the -OH group in alcohols is what distinguishes them structurally from other organic molecules.
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In your chemistry class, your final grade is based on four categories. The categories are tests, labs, assignments, and a final exam. Suppose you earned the following grades in each of the categories; 72% on tests, 88% on labs, 64% on assignments, and 96% on the final exam. If tests are worth 26%, labs are worth 14%, assignments are worth 8%, and the final exam is worth 52%, determine your final grade in the course. Record the grade below as a percentage accurate to two decimal places.
Answers
Your final grade in the course, accurate to two decimal places, is 86.08%.
To determine your final grade in the course, we need to calculate the weighted average of your grades in each category.
Given the following weights for each category:
Tests: 26%
Labs: 14%
Assignments: 8%
Final Exam: 52%
Let's calculate the weighted scores for each category:
Weighted score for tests = 72% (grade) * 26% (weight) = 18.72%
Weighted score for labs = 88% (grade) * 14% (weight) = 12.32%
Weighted score for assignments = 64% (grade) * 8% (weight) = 5.12%
Weighted score for final exam = 96% (grade) * 52% (weight) = 49.92%
Now, sum up the weighted scores:
Total weighted score = 18.72% + 12.32% + 5.12% + 49.92% = 86.08%
Therefore, your final grade in the course, accurate to two decimal places, is 86.08%.
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Rubidium is in Group I of the Periodic Table and bromine is in Group VII. Rubidium reacts with bromine to form an ionic compound. Which row shows the electron change taking place for rubidium and the correct formula of the rubidium ion?
Answers
To determine the electron change taking place for rubidium and the correct formula of the rubidium ion when it reacts with bromine, we need to consider their respective group numbers and the concept of electron transfer in forming ions.
Rubidium is in Group I of the Periodic Table, also known as the alkali metals. Elements in Group I have one valence electron. Bromine is in Group VII, also known as the halogens. Elements in Group VII have seven valence electrons.
When rubidium reacts with bromine, rubidium loses one electron to achieve a stable electron configuration, while bromine gains one electron to achieve its stable electron configuration. This electron transfer results in the formation of ions.
The rubidium ion will have a +1 charge since it loses one electron. The bromide ion, formed by bromine gaining one electron, will have a -1 charge.
Therefore, the correct formula for the rubidium ion is Rb+, indicating that it has lost one electron, and the bromide ion is represented by Br-, indicating that it has gained one electron.
Row: Rubidium (Rb) loses 1 electron, Rubidium ion (Rb+)
Formula: Rb+
Kindly Heart and 5 Star this answer and especially don't forgot to BRAINLIEST, thanks!If there are no chemical controls which can be implemented at your worksite, what can you do to protect yourself?.
Answers
If there are no chemical controls which can be implemented at your worksite than one should wear recommended PPE for protection .
PPE means personal protective equipment .PPE at the worksite is selected to reduce the risk to health and safety .PPE includes aprons , overalls , gloves , footwear face shields , chemical resistant glasses , and respirators .The PPE and administrative control measures depends upon the behavior and supervision of human .The efficacy of PPE depends entirely on the workers following the procedures and instructions appropriately .
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effective nuclear charge of Ga
Answers
what type of chemical is manganese(IV) oxide
Answers
Answer:
catalyst
Explanation:
it alters the speed of reaction
What percentage of the world's species of plants and animals can be found in the rainforest?
Answers
Answer:
50
Explanation:
Are sound waves longitudinal or transverse?
__________________
Answers
Answer:
Sound waves in air (and any fluid medium) are longitudinal waves because particles of the medium through which the sound is transported vibrate parallel to the direction that the sound wave moves.
Help me with this now please due in 20 mins
Answers
So
Calcium in one box
Hydroxide in the other.
Hope this helps!
i just need an explanation :) so the problem was " what is the mass of 5 molecules of water(H2O) , in grams?" my teacher said the answer is 1.50 x 10^-22 but i dont understand why. why is it not 1.50 x 10^24, why is the exponent negative?
Answers
Answer:
Explanation:
The exponent is negative because water molecules are absolutely tiny. You can't see a molecule of water on the palm of your hand with your naked eyes, right? If a the mass of a molecule was 1.50 x 10^24, it'd be HUGE... like absolutely massive (possible the size of your city). Molecules are just tiny, tiny particles
suppose a future student is assigned to repeat the same copper sulfate experiment. she prepares the same standard solutions that you prepared, and then measures them in the colorimeter without first using a water blank. what will be the result of this oversight?
Answers
If the student measures the standard solutions in the colorimeter without first using a water blank, it will lead to inaccurate absorbance readings and potentially affect the accuracy of the experiment.
A crucial step in spectrophotometric measurements is the use of a water blank. In the same cuvette or container used for the sample solutions, the absorbance of pure water is measured. The water blank's function is to compensate for any stray light or background absorbance that may be present in the system. The learner can determine the actual absorbance values for the components of interest by deducting the absorbance of the water blank from the absorbance readings of the sample solutions.
Without the use of a water blank, the observed absorbance values can contain contributions from stray light or background absorbance, which can obstruct the precise estimation of the analyte concentration. This mistake may provide inaccurate or deceptive data, which may compromise the validity of the experiment and may produce false findings.
As a result, the accuracy and validity of the data from the copper sulfate experiment may be compromised if a water blank was not used in the colorimeter observations.
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What conclusion can you make about the mechanism of the reaction based on the products formed?
Answers
The mechanism of the reaction can be inferred from the products formed.
When analyzing the products formed in a chemical reaction, we can draw conclusions about the mechanism underlying the process. The types and properties of the products can provide valuable insights into the steps involved in the reaction and the pathways by which it occurs.
Firstly, the nature of the products can reveal information about the reactants and the types of bonds present. For example, if the reaction yields a new compound with a different functional group or a rearrangement of atoms, it suggests the occurrence of bond breaking and bond forming processes. On the other hand, if the reaction results in the formation of a compound with similar properties to the reactants, it implies a simple transformation or a change in the physical state.
Secondly, the stoichiometry and relative quantities of the products can provide clues about the reaction mechanism. If the reaction follows a specific stoichiometric ratio, it suggests a stepwise process with defined intermediates. In contrast, an unexpected ratio of products might indicate the involvement of side reactions or multiple pathways.
Furthermore, the presence of specific by-products or the absence of expected products can offer further insights. By-products may arise from secondary reactions or competing pathways, while missing products could indicate limitations in the reaction conditions or the necessity of additional factors for their formation.
In conclusion, by examining the products formed in a reaction, we can gain valuable information about the underlying mechanism. The types of products, their stoichiometry, and the presence of specific by-products or missing products all contribute to our understanding of the reaction pathways and the steps involved. This analysis allows us to draw conclusions about the nature of the reaction and provides a foundation for further investigations.
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Each astronaut uses approvimate 2500 kilocalories per day, and there are 4 Kilocalories perorane of glucose. Calculate how many grams of glucose wil be required for the three astronauts (for the three days).
Answers
Each astronaut uses approvimate 2500 kilocalories per day, and there are 4 Kilocalories perorane of glucose. 9404.2g is the mass of glucose will be required for the three astronauts.
In physics, mass is a quantitative measurement of inertia, a basic characteristic of all matter. It essentially refers to a body of matter's resistance to changing its speed or location in response to the exertion of a force. The change caused by a force being applied is smaller the more mass a body has. Despite being connected to mass, weight is distinct from that latter. Weight fluctuates somewhat from place to place since it is essentially the force of Earth's gravitational attraction acting on stuff.
kilocalories per day = 2500 kilocalories
mass of glucose = 2500/4
= 625g
total mass of glucose = 625×3
= 9404.2g
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Which of the following is an ozone depleting substance (ODS)?
a.
ultraviolet radiation
b.
chlorofluorocarbon (CFC)
c.
biogeochemical cycle
d.
none of the above
Answers
Answer:
b
Explanation:
In an ecosystem, the ozone depleting substance is chlorofluorocarbon or the CFC's.
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 ecosystem 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.There are different types of ecosystems.
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what are the benefits of a large sample size?
Answers
Answer:
A large sample size can provide several benefits in research:
1. Increased statistical power: A larger sample size can increase the statistical power of a study, which means that it is more likely to detect a significant effect if one exists.
2. Greater precision: A larger sample size can also increase the precision of the estimates made based on the data, which means that the results are more likely to be accurate and representative of the population being studied.
3. Reduced sampling error: A larger sample size can reduce the impact of sampling error, which is the difference between the sample mean and the true population mean.
4. Improved generalizability: A larger sample size can improve the generalizability of the findings to the population as a whole, which means that the results are more likely to be applicable to other groups beyond the sample studied.
Overall, a larger sample size can increase the reliability and validity of research findings, and can lead to more accurate and robust conclusions.
The benefits of a large sample size in statistics include increased precision, greater representativeness, and increased statistical power.
Explanation:A large sample size in statistics has several benefits:
Increased Precision: With a larger sample size, the sample mean or proportion will be closer to the population mean or proportion. This reduces the sampling error and increases the precision of estimates.Greater Representativeness: A larger sample size provides a better representation of the population. It includes more diverse characteristics and reduces the chance of bias due to a specific subgroup being overrepresented.Increased Statistical Power: A larger sample size increases the power of statistical tests, making it easier to detect real effects or differences. This is particularly important in hypothesis testing, where a larger sample size improves the ability to reject or accept a null hypothesis.Learn more about benefits of large sample size here:https://brainly.com/question/32263483
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In the spectrophotometric analysis of benzene, the calibration curve has a slope of 195AU/M and an intercept of 0.079AU. If an unknown has an absorbance of 0.517 AU, what is the concentration of benzene in the sample?
a) 2.09e-4M
b) 2.25e-3M
c) 2.65e-3M
d) 0.438M
Answers
In the spectrophotometric analysis of benzene, you have a calibration curve with a slope of 195 AU/M and an intercept of 0.079 AU. To find the concentration of benzene in a sample with an absorbance of 0.517 AU is2.25e-3 M, which corresponds to option (b).
To calculate concentration follow these steps:
1. Use the calibration curve equation: Absorbance = (slope × concentration) + intercept
2. Plug in the given values and solve for concentration: 0.517 AU = (195 AU/M × concentration) + 0.079 AU
3. Subtract the intercept from both sides: 0.517 AU - 0.079 AU = 195 AU/M × concentration
4. Divide both sides by the slope: (0.438 AU) / (195 AU/M) = concentration
5. Calculate the concentration: concentration ≈ 2.25e-3 M
The concentration of benzene in the sample is approximately 2.25e-3 M, which corresponds to option (b).
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The reactants in a chemical equation have 3 carbon atoms, 6 oxygen atoms, and 4 hydrogen atoms. In order to follow the conservation of matter, the products of the chemical equation will have
A
the same number of atoms but of different elements.
B
the same number of atoms of each element.
C
fewer atoms of different elements.
D
more atoms of each element.
Answers
Answer:
the answer of rhe question is B
Scientific knowledge can withstand the test of time because
A.
scientific theories have been proven beyond doubt.
B.
it is open to change as new evidence or data is discovered.
C.
advancements in technology have no impact on science.
D.
exceptions can be made regarding scientific laws.
Answers
B
Hope that helped
Answer: Its B for the Study Island assignment
Explanation:
which temperature scale avoids negative temperatures
Answers
Answer:
See below:
Explanation:
Hello! My name is Galaxy and I will be helping you today. I hope you are having a nice day.
There are 3 main ways to measure temperatures, you have Celsius, Fahrenheit, and Kelvins.
Celsius and Fahrenheit are main ways to measure heat in non-scientific terms, althought they are used sometimes when needed.
Kelvins are used for Science as they are precise and can deal with temperatures that are super hot or super cold.
The lowest temperature in Kelvins is 0 degrees Kelvin, also known as Absolute Zero. There are no temperatures above that. So the answer to your question would be Kelvins.
what is the mass, in grams, of 2.4 x 10^23 atoms of Zn
Answers
Answer: 26.07 g Zn if need to correct sig figs its 26 g Zn
Explanation:
use stoichiometry to solve
2.4 X 10^23 atoms Zn X (1mole Zn / 6.02 X 10^23 atoms Zn) X (65.38 g Zn/ 1 mole Zn) =
26.07 g Zn
1. identify a metal that matches each of the following descriptions. There may be more than one possible metal.
a Reacts slowly with cold water to form a hydroxide.
b Does not react with oxygen when heated.
c Reacts slowly with dilute acid.
d Reacts very vigorously in cold water to form hydroxide.
Answers
Answer:
I don't think there is any metal matches with this condition
#27. When two amino acids are joined via a peptide bond, what is the mass of the byproduct of the reaction?
Answers
When two amino acids join via a peptide bond, the mass of the byproduct, which is a water molecule, is approximately 18 atomic mass units.
When two amino acids are joined via a peptide bond, a byproduct is formed as a result of the reaction. This process, called dehydration synthesis, involves the removal of a water molecule (H2O) as the amino acids form the peptide bond.
To create a peptide bond, the carboxyl group (COOH) of one amino acid reacts with the amino group (NH2) of another amino acid. During this reaction, the carboxyl group loses a hydroxyl group (OH) while the amino group loses a hydrogen atom (H). The two amino acids are then linked by the peptide bond, and the released hydroxyl group and hydrogen atom combine to form a water molecule.
The mass of the byproduct, which is a water molecule, can be calculated by adding the atomic masses of its constituent atoms.
A water molecule consists of one oxygen atom and two hydrogen atoms. The atomic mass of oxygen is approximately 16 atomic mass units (amu), and the atomic mass of hydrogen is approximately 1 amu. Therefore, the total mass of a water molecule is:
1 oxygen atom × 16 amu/oxygen atom + 2 hydrogen atoms × 1 amu/hydrogen atom = 16 amu + 2 amu = 18 amu.
In summary, when two amino acids join via a peptide bond, the mass of the byproduct, which is a water molecule, is approximately 18 atomic mass units.
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When liquid silver nitrate and liquid sodium chloride are combined, solid silver chloride forms along with a new liquid, sodium nitrate. Which substance represents the precipitate? silver nitrate silver chloride sodium chloride sodium nitrate
Answers
Answer:
silver chloride I think i'm not totally sure
Explanation:
The substance which represents the precipitate is silver chloride, AgCl.
Data obtained from the question
•Silver nitrate (l)
•Sodium chloride (l)
•Silver chloride (s)
•Sodium nitrate (l)
Definition of precipitateA precipitate is a substance obtained from a reaction that is insoluble.
How to write the equation•Silver nitrate (l) => AgNO₃ (l)
•Sodium chloride (l) => NaCl (l)
•Silver chloride (s) => AgCl (s)
•Sodium nitrate (l) => NaNO₃ (l)
AgNO₃(l) + NaCl (l) —> AgCl(s) + NaNO₃(l)
From the balanced equation above, we can see that AgCl is in solid form.
Thus, the precipitate from the reaction is Silver chloride, AgCl.
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Which of these is a property of acids? Question 1 options: They taste sour. They turn litmus paper blue. They feel slippery. They typically contain an -OH group.
Answers
Answer:
C , They taste sour
Answer:
They taste sour
Explanation:
I know it's late but i couldnt help it i just took the test
What is an oxidizing agent ?
Answers
Answer:
A substance that tends to bring about oxidation by being reduced and gaining electrons
Explanation:
Answer:
An oxidizing agent is a substance that takes negatively charged electrons "away" from a substance or object; usually taking these electrons for itself it can also transport the electrons from an object and "give" them to another substance or object. The object that has been oxidized will then have a positive charge after losing the negative electrons and the substance receiving the electrons will become negative.
Explanation:
Examples include halogens, potassium nitrate, and nitric acid.