Potassium atoms contribute one eletron to metallic bonding,but calcium atoms contribute two eletrons .Explain which metal is likely to be harder
Answers
Answer:
potassium is likely to be harder
Explanation:
because whenan atom loss electron they can form particle ion acquare stable a arrangement that loos electron can transfer to another which that also to acquaire stable
Related Questions
5. A difference in air pressure creates what?
Answers
Wind results from a horizontal difference in air pressure and since the sun heats different parts of the Earth differently, causing pressure differences, the Sun is the driving force for most winds. 1.
What is meant by pressure?
The force delivered perpendicularly to an object's surface per unit area across which that force is dispersed is known as pressure (symbol: p or P).The pressure relative to the surrounding air is referred to as gauge pressure (sometimes spelled gauge pressure).Pressure is expressed using a variety of units. Some of these come from dividing a unit of force by a unit of area; the traditional unit of pressure in the imperial and U.S. customary systems is the pound-force per square inch (psi, symbol lbf/in2), whereas the SI unit of pressure, the pascal (Pa), is one newton per square metre (N/m2).To learn more about pressure refer to
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what aspects are not accounted for in the ideal gas law?
Answers
The aspects not accounted for in the ideal gas law are the force of attraction of the gas molecules on each other and the volume of the gas molecules.
In the ideal gas law, it it assumed that the molecules of the gas are so far away from each other and thus they do not exert a significant force of attraction on each other. Also, the volume of each molecule of gas is neglected and assumed negligible and thus does not account for the overall volume of the gas.
So, the aspects not accounted for in the ideal gas law are the force of attraction of the gas molecules on each other and the volume of the gas molecules.
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Answer:
interactions between molecules
size of molecule
Can u please answer if you know.
Answers
Answer:
plants
Explanation:
they are plant cells, happy Thanksgiving :)
Answer: photosynthetic tissues
Explanation: Chloroplasts are present in the cells of all green tissues of plants and algae. Chloroplasts are also found in photosynthetic tissues that do not appear green, such as the brown blades of giant kelp or the red leaves of certain plants.
2
Which represents a mixture?
*
Ос.
Answers
Explanation:
A mixture is an impure substances with the following properties:
Composition is indefinite i.e they consist of two or more elements and or compounds in any proportion by massConstituents retain their identities i.e physical properties are retainedConstituents reacts differently to changed conditions. They can easily be separated into constituents by physical methodsExamples are air, sea - water, muddy water, palm -wine, petroleum, alloys etc.
Using this description it should be easy to identify a mixture.
based on the law of multiple proportions, how many grams of hydrogen would you expect 2.58 g of nitrogen to combine with to yield ammonia?
Answers
Based on the law of multiple proportions, there are 0.55 grams of hydrogen.
Law of multiple proportions or Dalton's Law said that the ratios of the masses of the second element which combine with a fixed mass of the first element will be ratios of small whole numbers.
In one molecule of the ammonia, there are three hydrogen atoms and one nitrogen atom
In a molecule of ammonia (NH3), proportion of the masses of nitrogen and hydrogen is:
m(N) : m(H) = 14 : (3·1) = 14 : 3
Mass of nitrogen is 2.58 grams
2.58 g : m(H) = 14 : 3
m(H) = 0.55 g; mass of hydrogen needed to react with nitrogen
Balanced chemical reaction: N₂ + 3H₂ ⇄ 2NH₃
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Read these cell observations. In the space next to each answer choice, write whether the cells described are prokaryotic cells, animal cells, plant cells or there is not enough information
To determine.
Answers
AnswerDo you have a picture of the chart
Explanation:
15. What is the maximum pH an aqueous solution of 0.050 M Cu(NO3)2 can be adjusted to before a precipitate of Cu(OH)2 will form
Answers
The maximum pH an aqueous solution of 0.050 M Cu(NO3)2 is mathematically given as
pH=5.8
What is the maximum pH an aqueous solution of 0.050 M Cu(NO3)2 can be adjusted to before a precipitate of Cu(OH)2 will form?
Generally, the equation for the Chemical reaction is mathematically given as
Cu(OH)2----><---Cu^2 +2OH-
Therefore
s^2=1.0*10^{-19}
s=3.16*10^{=9}
{OH-}=2s=6.3*10^10^{-19}
{H+}=10^{-14}/OH
{H+}=1.58*10^{-6}
In conclusion
pH=-log(1.58*10^{-6}
pH=5.8
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Three 1.00-L flasks at 25 C and 725 torr contain the gases CH4 (flask A), CO2 (flask B), and C2H6 (flask C). In which flask(s) is/are there 0.039 mol of gas?
a. flask C
b. flasks A and B
c. flasks B and C
d. flasks A, B and C
Answers
All flasks have 0.039 moles of gas. Therefore, option D is correct.
Given:
All 3 flasks have
Volume (V) = 1.00L
Pressure (P) = 750Torr
Temperature (T) = 25°C
= 298K
As all three parameters P, V and T are identical according to Avogadro's law, all three flasks should have same number of moles irrespective of the gas.
So, all have the same number of moles.
Now, if the moles = 0.039
Using the ideal gas equation
PV = nRT
n = PV/RT
= (725/760) atm x 1.00L / 0.0821L.atm/K.mol x 298
=0.03899 mol
=0.039 mol
Thus, all flaks have 0.039 moles of gas.
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HELP!! Which of the following phase changes occur at point B on the phase diagram shown below?
Boiling
Condensation
Freezing
Sublimation
Answers
Answer:
freezing
Explanation:
because condensation is gas to liquid boiling is liquid to gas and sublimation is solid to gas
Below are is a before and after particle diagram that shows the process of
condensation. Choose the statement below that best describes how the
particles changed in their arrangement during this process.
Attempt d
2 Minute
Before: Gas 100 C
After: Liquid 30 C
Answers
Answer:
It must first melt to become a liquid and then evaporate to become a gas
Explanation:
three hydroxide ions are needed to form a neutral ionic compound with an aluminum ion. (True or False)
Answers
False.Aluminum ion has a charge of +3 and hydroxide ion has a charge of -1. To form a neutral ionic compound, three hydroxide ions will combine with one aluminum ion.
A compound is a substance made up of two or more different elements that are chemically bonded together in a fixed ratio. The elements in a compound cannot be separated by physical means, such as filtration or evaporation, but can be separated by chemical means, such as a chemical reaction. Examples of compounds include water (H2O), sodium chloride (NaCl), and carbon dioxide (CO2)
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what are the two ways in which the physical state of matter can be changed
Answers
The two ways in which the physical state of matter can be changed are melting and freezing.
Melting is the process by which a solid substance transitions to a liquid state. As a result, the energy added to the solid substance causes the molecules to vibrate at a higher rate. As a result, the heat breaks the bonds between the molecules, allowing them to flow freely.Freezing is the process by which a liquid substance transitions to a solid state. As a result, energy is removed from the liquid substance. The molecules in the substance are moving quickly, but when energy is removed, they slow down.Because of the decrease in energy, the molecules can no longer slide past one another and form a rigid structure, resulting in a solid state of matter.For such more questions on physical state
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what is the percent ionization of 0.20 m iodic acid? (the ka value for iodic acid, hio3, is 1.7 × 10−1.)
Answers
The percent ionization of 0.20 M iodic acid is approximately 92.3%.
To determine the percent ionization of iodic acid (HIO3), we need to calculate the concentration of ionized H+ ions compared to the initial concentration of HIO3.
The ionization of iodic acid can be represented by the following equilibrium equation:
HIO3(aq) ⇌ H+(aq) + IO3-(aq)
The equilibrium constant expression (Ka) for this reaction is given as:
Ka = [H+(aq)][IO3-(aq)] / [HIO3(aq)]
Given that the Ka value for iodic acid is 1.7 × 10^(-1), we can set up the following expression:
1.7 × 10^(-1) = [H+(aq)][IO3-(aq)] / [HIO3(aq)]
Since the initial concentration of HIO3 is 0.20 M, we can assume that the concentration of H+ and IO3- ions formed at equilibrium is x.
Thus, the equilibrium expression becomes:
1.7 × 10^(-1) = x^2 / (0.20 - x)
To simplify the calculation, we can assume that x is very small compared to 0.20, so we can approximate 0.20 - x as 0.20.
1.7 × 10^(-1) = x^2 / 0.20
Cross-multiplying, we get:
0.034 = x^2
Taking the square root of both sides, we find:
x ≈ 0.1846
The percent ionization is given by:
Percent Ionization = (concentration of ionized H+ ions / initial concentration of HIO3) * 100
Plugging in the values, we have:
Percent Ionization = (0.1846 / 0.20) * 100
Percent Ionization ≈ 92.3%
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17. Given: CuSO
KlCul_K50)
Answer the following:
a. Determine the limiting reactant when 6.76 grams of copper(II) sulfate is reacted with 9.82
grams of potassium iodide?
b. Using the information from (a), what would be the mass of all three products?
C.
If 0.331 grams of iodine is produced, how many molecules of KI were reacted?
Answers
I think its c. I'm not 100% tho
Which half-reaction shows conservation of charge? * 5 points A) Cu + e– → Cu+ B) Cu2+ + 2e– → Cu C) Cu+ → Cu + e– D) Cu2+ → Cu + 2e–
Answers
Answer:
B) Cu2+ + 2e– → Cu.
Explanation:
Hello there!
In this case, in the regard of redox reactions, we must keep in mind that half-reactions show us how the flow of electrons when an element undergoes a change in its oxidation state, say increasing or decreasing. In such a way, if the element is oxidized, increase the oxidation state, we add electrons on the right side and the contrary if the element is reduced, decrease the oxidation state.
In such a way, we can see that the reaction B) Cu2+ + 2e– → Cu, shows how the Cu2+ cations are reduced by adding electrons to produce Cu and thus, conserve the charge.
Best regards!
can someone help me with this plz??
Answers
Answer:
I dont know at all and that is confusing.
what does it mean the mass of a book is 2.5 kg
Answers
Answer:
Below
Explanation:
The AMOUNT of matter the book contains is 2.5 kg.
this mass is the same no matter where the book is located....on earth, the moon, in space....still 2.5 kg
the ratio of effusion of an unknown diatomic gas to oxygen is 0.50:1. what is molar mass of the unknown gas?
Answers
The molar mass of the unknown gas is 8.05 g/mol.
The ratio of effusion of an unknown gas to oxygen is 0.50:1, which means that the effusion rate of the unknown gas is half that of oxygen. Effusion is the process by which a gas escapes through a tiny hole into a vacuum, and the rate of effusion is directly proportional to the square root of the gas' molar mass. So, we can use this relationship to calculate the molar mass of the unknown gas.
Let's assume that the molar mass of oxygen is 32 g/mol. Then, the square root of the molar mass of oxygen is √32 = 5.66. If the effusion rate of the unknown gas is half that of oxygen, then the square root of its molar mass is 0.5 * 5.66 = 2.83. Taking the square of 2.83 gives us 8.05, which is the molar mass of the unknown gas.
Therefore, the molar mass of the unknown gas is 8.05 g/mol.
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Examine the neutralization reaction,
Neutralization Reaction - Definition, Equation, Examples & Applications
What are the products of this reaction?
Responses
Acid and base
HOH only
water and salt
only salt
Answers
water and salt is the product of this reacti
HELPPP ... short response
In your own words, explain how mass is conserved in a chemical reaction
Answers
Answer:
Matter cannot be created or destroyed in chemical reactions.
Explanation:
Matter cannot be created or destroyed in chemical reactions. This is the law of conservation of mass. In every chemical reaction, the same mass of matter must end up in the products as started in the reactants. Balanced chemical equations show that mass is conserved in chemical reactions
Answer:
Mass is conserved in chemical reactions because the atoms are just rearranged. Any atoms of an element that you have in the reactants is still there in the products, just combined differently with other atoms. The mass of an atom is the same before and after the reaction, so the total mass of the reactants and products is equal.
Explanation:
Got the question right on an assignment
Consider that you are interested in the commercial production of apples (or any other named fresh produce of your choice). Discuss factors or aspects that you would consider in the production and marketing of apples(or any other named fresh produce of your choice). Under the following headings: Pre-harvest factors (20) Harvesting (10) Precooling (20) Packing operations (8) Packaging (8) Storage (10) Transportation (8) Marketing (8) Retailing (8) NB. Your advice on each one of the above aspects.
Answers
When considering the commercial production and marketing of apples , several factors like pre-harvest factors, harvesting, precooling, packing operations, packaging, storage, transportation, marketing, and retailing.
Pre-harvest factors: These include selecting suitable varieties, managing pests and diseases, providing proper nutrition, irrigation, and maintaining orchard hygiene to ensure healthy and high-quality apple crops.
Harvesting: Harvesting apples at the right time is important to ensure optimal taste and quality. Proper techniques should be employed, such as hand-picking or using mechanical harvesters, and care should be taken to prevent damage to the fruit during harvesting.
Precooling: Apples should be rapidly cooled after harvest to remove field heat and preserve their freshness. This can be done using forced-air cooling or hydrocooling methods to bring down the temperature quickly.
Packing operations: Sorting and grading apples based on size, color, and quality is essential for uniformity and market appeal. Proper packing procedures, including gentle handling and appropriate equipment, should be followed to prevent bruising and maintain fruit quality.
Packaging: Choosing suitable packaging materials and designs that provide protection, ventilation, and visibility of the apples is crucial. Packaging should be attractive, informative, and eco-friendly to attract customers and maintain product integrity.
Storage: Apples require controlled storage conditions to extend their shelf life. Maintaining the right temperature, humidity, and ventilation in storage facilities is essential to prevent spoilage, maintain freshness, and avoid losses.
Transportation: Efficient and timely transportation of apples from the orchard to the market is critical. Proper handling, packaging, and temperature control during transportation help preserve the quality and minimize damage.
Marketing: Developing effective marketing strategies, such as branding, promotion, and pricing, is crucial to reach the target market, create demand, and differentiate the product from competitors. Understanding consumer preferences and market trends is essential for successful marketing.
Retailing: Establishing partnerships with retailers, such as grocery stores or farmers' markets, is important for distribution and sale of apples. Providing attractive displays, product information, and maintaining quality standards at the retail level helps attract customers and ensure repeat business.
By considering these factors and aspects in the production and marketing of apples, producers can enhance the overall success and profitability of their business while delivering high-quality produce to consumers.
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This table shows the mass and volume of four different objects.
Which ranks the objects from most to least dense?
X, Y, W, Z
X, Z, Y, W
W, Y, Z, X
Z, Y, X, W
Answers
Answer:
second one/ B
Explanation:
just took the quiz
Answer:b
Explanation:
Where do you think the atoms for plant growth come from?
Answers
Answer:
the mass of a tree is primary carbon
Explanation:
the the carbon comes from carbon dioxide during photosynthesis
Answer:
Plants get all the carbon, hydrogen, and oxygen they need from carbon dioxide and water, which they use to build carbohydrates during photosynthesis. To build other kinds of molecules they also need elements like nitrogen, phosphorous, and sulfur. Plants get these as well as other elements from the soil.
Explanation:
Zn + 2HCl → ZnCl₂ + H₂
How many moles of hydrogen are
produced from the reaction of three
moles of zinc with an excess of
hydrochloric acid?
STUDENT
Answers
Answer:
The balanced chemical equation you provided is:
Zn + 2HCl → ZnCl₂ + H₂
From the equation, we can see that for every 1 mole of zinc (Zn) reacting, 1 mole of hydrogen gas (H₂) is produced. Therefore, the mole ratio of zinc to hydrogen is 1:1.
If you have 3 moles of zinc, you will produce an equal number of moles of hydrogen gas. Therefore, when 3 moles of zinc react with an excess of hydrochloric acid, 3 moles of hydrogen gas will be produced.
Explanation:
according to durkheim, the quickest way for a group to bond is to:
Answers
According to Émile Durkheim, a prominent sociologist, the quickest way for a group to bond is through the experience of collective effervescence.
Durkheim's concept of collective effervescence refers to a state of intense emotional excitement and unity that arises when individuals come together in a group and engage in shared rituals, activities, or experiences. During these moments, individuals feel a strong sense of connection and solidarity with the group as they transcend their individual identities and become part of something larger. Collective effervescence acts as a bonding mechanism within a group, reinforcing social cohesion and a sense of belonging. It helps create a shared consciousness and shared values among group members. This collective experience can occur in various social contexts, such as religious ceremonies, sporting events, political rallies, or cultural celebrations.Durkheim believed that collective effervescence played a crucial role in maintaining social order and solidarity in society. It provides individuals with a sense of purpose and belonging, reinforcing social norms and values. By participating in collective rituals and experiencing collective effervescence, individuals strengthen their social ties and contribute to the cohesion of the group.
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When producing a soluble salt in a reaction between an acid and an alkali, how can you prepare dry solid crystals from the solutions
1)evaporation/crystallization
2)filtration
3)condensation
4)nuetralisation
Answers
Explanation:
Making a salt from an alkali
If you are using an alkali - which is a soluble base - then you need to add just enough acid to make a neutral solution (check a small sample with universal indicator paper).
Warm the salt solution to evaporate the water. You get larger crystals if you evaporate the water slowly.
Graphically, a point is a solution to a system of two inequalities if and only if the point
Answers
Hope this helps
Answer:
b
Explanation:
A gas at constant volume has a pressure of 4. 50 atm at 200. K. What will be the pressure of the gas at 250. K? 3. 60 atm 4. 60 atm 5. 63 atm 5. 89 atm.
Answers
5.625 atm will be the pressure of the gas at 250 K temperature of the gas at constant volume.
How we calculate the pressure of the gas?Pressure of the gas will be calculated by using the ideal gas equation as:
PV = nRT,
From the question, it is clear that:
Moles of the gas and volume is constant here, so we calculate the pressure by rearranging the above equation as:
P/T = nR/V
And required equation will be:
P₁/T₁ = P₂/T₂, where
P₁ = pressure of gas = 4.50 atm
T₁ = temperature of gas = 200 K
P₂ = pressure of gas = to find?
T₂ = temperature of gas = 250 K
On putting all these values in the above equation, we get
P₂ = 4.50 × 250 / 200 = 5.625 atm
Hence, 5.625 atm is the pressure of the gas.
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if you start with 55 grams of sodium flouride naf how many grams of magnesium fluride mgf2 will be produced
Answers
Answer:
Mass of MgF₂ formed = 40.5 g
Explanation:
Given data:
Mass of NaF = 55 g
Mass of MgF₂ formed = ?
Solution:
Chemical equation:
2NaF + Mg → MgF₂ + 2Na
Number of moles of NaF:
Number of moles = mass/molar mass
Number of moles = 55 g / 41.98 g/mol
Number of moles = 1.3 mol
now we will compare the moles of sodium fluoride with magnesium fluoride.
NaF : MgF₂
2 : 1
1.3 : 1/2×1.3 = 0.65 mol
Mass of magnesium fluoride:
Mass = number of moles × molar mass
Mass = 0.65 mol × 62.3 g/mol
Mass = 40.5 g
which of the following should not be done when sterilizing lab equipment using ethanol and a flame? select one: a. keep the alcohol as far from the flame as possible b. hold the tool being sterilized tip down c. hold the tool being sterilized tip up d. both a and c
Answers
The thing that should not be done when sterilizing lab equipment using ethanol and a flame is is d) both a and c.
When sterilizing lab equipment using ethanol and a flame, it is important to follow proper safety procedures. Option a) "keep the alcohol as far from the flame as possible" is incorrect because it is crucial to keep the alcohol away from the flame. Ethanol is highly flammable, and if the alcohol comes into contact with the flame, it can lead to a fire or explosion. Therefore, it is essential to maintain a safe distance between the alcohol and the flame.
Option c) "hold the tool being sterilized tip up" is also incorrect. Holding the tool being sterilized with the tip up can cause any residual ethanol on the tool to flow towards the hand holding the tool. This increases the risk of the ethanol catching fire and causing burns. It is advisable to hold the tool being sterilized with the tip down to prevent any potential contact between the flame and the ethanol. Thus, both options a) and c) should not be done when sterilizing lab equipment using ethanol and a flame.
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