The atomic models does the Rutherford’s experimental evidence as the support is the Bohr's model.
The Rutherford's theory plays the role upon which the Bohr's model is explained. The Rutherford describes the fact at which the center of the atom, and there is the nucleus and whose radius will be the smaller than that of the radius of the atom. The nucleus is the positively charged and the most of mass of the atom are concentrated in it. The Electrons revolves round this nucleus in the orbits.
The experimental evidences that of the Bohr's model which shows that the Rutherford's model was the fundamentally correct.
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Read the sentences from the Newsela article, "First All-Female Spacewalk Will Take Place During Women's History Month. "
"'I remember telling my mom at that time, and I never deviated from what I wanted to be. Something about exploration has fascinated me from a young age. "
What is the meaning of deviated?
A: struggled
B: recovered
C: strayed
D: profited
Answer:
C ; strayed
Explanation:
I took the k-12 quiz.
Answer:
C
Explanation:
I TOOK THE TEST
Cu + 2 AgNO3 + Cu(NO3)2 + 2Ag
If 7.28 moles of copper and 7.28 moles of silver nitrate are available to
react, what is the theoretical yield of silver produced?
Answer:
7.28 moles Ag°
Explanation:
Cu° + 2 AgNO₃ => Cu(NO₃)₂ + 2Ag°
Given 7.28 moles 7.28 moles
To determine limiting reactant, divide the mole values by the respective coefficient of balanced equation. The resulting smallest value is the limiting reactant. Note: this is a short cut method for determining limiting reactant only. Once the limiting reactant is determined one must use the given mole values of the limiting reactant to solve problem. That is ...
Limiting reactant determination:
Cu° + 2 AgNO₃ => Cu(NO₃)₂ + 2Ag°
Cu: 7.28 / 1 = 7.28
AgNO₃ : 7.28 / 2 = 3.64 => Limiting Reactant is AgNO₃
Solving Problem depends on AgNO₃; Cu will be in excess.
Since coefficients of AgNO₃ & Ag° are equal, then the moles AgNO₃ used equals moles Ag° produced and is therefore 7.28 moles Ag°.
be sure to answer all parts. calculate the poh and ph of the following aqueous solutions at 25°c. (a) 0.014 m koh poh: ph: (b) 1.65 m naoh poh: ph: (c) 0.084 m ba(oh)2 poh: ph:
a. pOH of 0.014 M KOH at 25°c is 1.85 and PH of 0.014 M KOH is 12.15.
b. pOH of 1.65 M NaOH is 0.18 and pH of 1.65 M KOH is 13.82.
c. pOH of 0.084 M Ba(OH)₂ is 0.77 and pH of 0.084 M Ba(OH)₂ is 13.23.
a. 0.014 M KOH:
Since KOH is a strong base, its pOH can be calculated as the negative logarithm of its concentration:
pOH = -log(0.014) ≈ 1.85
To find the pH, use the formula: pH = 14 - pOH
pH = 14 - 1.85 ≈ 12.15
b. 1.65 M NaOH:
NaOH is also a strong base, so follow the same process:
pOH = -log(1.65) ≈ 0.18
pH = 14 - 0.18 ≈ 13.82
c. 0.084 M Ba(OH)₂:
Since each Ba(OH)₂ molecule releases 2 OH⁻ ions when it dissociates, the concentration of OH⁻ ions is 2 × 0.084 = 0.168 M.
pOH = -log(0.168) ≈ 0.77
pH = 14 - 0.77 ≈ 13.23
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$0.500 mL of 0.300 mol / L potassium chromate is added to 30.0 mL of 0.0105 mol/L lead (II) nitrate. Find liming reagent
0.500 mL of 0.300 mol / L potassium chromate is added to 30.0 mL of 0.0105 mol/L lead (II) nitrate here Lead (II) nitrate is the limiting reagent in this reaction.
To determine the limiting reagent in the reaction between potassium chromate (K2CrO4) and lead (II) nitrate (Pb(NO3)2), we need to compare the amount of each reactant present and identify which one is completely consumed.
Firstly, we need to balance the chemical equation for the given reaction:
2 K2CrO4 + Pb(NO3)2 → PbCrO4 + 4 KNO3
Now, let's calculate the number of moles for each reactant:
Concentration of potassium chromate solution = 0.300 mol/L
Volume of potassium chromate solution = 0.500 mL = 0.500 L
Number of moles of potassium chromate = volume × concentration = 0.500 L × 0.300 mol/L = 0.150 mol
Concentration of lead (II) nitrate solution = 0.0105 mol/L
Volume of lead (II) nitrate solution = 30.0 mL = 0.0300 L
Number of moles of lead (II) nitrate = volume × concentration = 0.0300 L × 0.0105 mol/L = 0.000315 mol
The balanced chemical equation states that the stoichiometric ratio of lead (II) nitrate to potassium chromate is 2:1. This means that 2 moles of potassium chromate react with 1 mole of lead (II) nitrate.
By comparing the moles of each reactant, we can see that potassium chromate is abundant (0.150 mol), whilst lead (II) nitrate is scarce (0.000315 mol).
Lead (II) nitrate is the limiting reagent in this instance because the reactant with the less moles is the limiting reagent.
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which protein is sensitive to ca2 and thereby helps initiate contraction?
The protein that is sensitive to Ca₂ and helps initiate muscle contraction is called troponin.
TroponinsTroponins are a group of proteins that play a crucial role in muscle contraction, particularly in skeletal and cardiac muscles. They are composed of three subunits: troponin C (TnC), troponin I (TnI), and troponin T (TnT).
Troponin C binds to calcium ions (Ca²⁺) and undergoes a conformational change when Ca²⁺ levels increase. This change allows troponin I to release its inhibition on the actin-myosin interaction, allowing muscle contraction to occur. Troponin T anchors the troponin complex to the tropomyosin strands, which are filamentous proteins that regulate access to the myosin-binding sites on actin.
The interaction between troponin and calcium is a crucial step in the excitation-contraction coupling of muscles. When a nerve impulse stimulates muscle contraction, calcium ions are released from the sarcoplasmic reticulum into the muscle cell. The increased calcium concentration binds to troponin C, leading to the removal of tropomyosin from the myosin-binding sites on actin, enabling the myosin heads to attach and generate force, resulting in muscle contraction.
Troponins serve as regulatory proteins, allowing precise control of muscle contraction and relaxation. By responding to changes in calcium levels, they enable the initiation and regulation of muscle contraction in response to neural signals.
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What do all volcanos emit?
Answer:
By far the most abundant volcanic gas is water vapor, which is harmless. However, significant amounts of carbon dioxide, sulfur dioxide, hydrogen sulfide and hydrogen halides can also be emitted from volcanoes.
Indicators change color when an acid and a base are mixed together. The change in color most likely indicates that a chemical change has occured. a physical change has occured. a new acid has been produced. a new base has been produced.
Answer:
a chemical change
Explanation:
a physical change is mostly identified even without indicators i.e candle wax about forming a new acid or base I guess we have to include a ph scale to ascertain since the salt can be acidic but not necessarily an acid
Answer: The answer is A, a chemical change has occurred
Explanation:
I’m just a jenious
From lithium and cesium which is less electronegative?
Answer:Electronegativity, symbolized as χ, is the tendency of an atom to attract shared electrons (or electron density) to itself.
Explanation:
Answer:
Explanation:
The correct answer is cesium
Because If you look at the electronegativities of just Lithium and Cesium then you would notice that the shielding effect is more prevalent in Cesium, thereby reducing the electronegativity and affecting the reduction potential
Which of the following is closest to the percentage (by weight) of water found in most beers? a) 60%. b) 70%. c) 80%. d) 90%.
The answer to the question is c) 80%. This is the closest percentage to the water content found in most beers.
The percentage of water in beer is an important factor to consider when brewing and analyzing the final product. In this question, we will explore the approximate percentage of water found in most beers. Water is a critical component in the brewing process, comprising the majority of the final product. Most beers have a water content ranging from 80-90% by weight. This is because water is needed to dissolve the fermentable sugars and extract flavors and aromas from the malted grains. Additionally, water plays a vital role in regulating the temperature during mashing and boiling.
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julio wants to find the volume of a small pebble. he drops it into a graduated cylinder filled with 30.0 ml of water. how is julio most likely trying to determine the pebble’s volume?
Julio determines that the volume of the small pebble is approximately 5.0 mL based on the water displacement method.
Julio is most likely using the method of water displacement to determine the volume of the small pebble.
Here's how the process typically works:
Julio starts with a graduated cylinder filled with a known volume of water, in this case, 30.0 mL.
He carefully adds the small pebble into the graduated cylinder, making sure it is fully submerged in the water without causing any spillage.
As the pebble is added to the water, it displaces some of the water, causing the water level in the graduated cylinder to rise.
Julio carefully observes and records the new water level in the graduated cylinder. Let's say the new water level is now at 35.0 mL.
To determine the volume of the pebble, Julio subtracts the initial volume of water (30.0 mL) from the final volume of water (35.0 mL). The difference between the two volumes represents the volume of water displaced by the pebble, which is equal to the volume of the pebble itself.
In this example, Julio would calculate the volume of the pebble as:
Volume of Pebble = Final Volume - Initial Volume
Volume of Pebble = 35.0 mL - 30.0 mL
Volume of Pebble = 5.0 mL
Therefore, Julio determines that the volume of the small pebble is approximately 5.0 mL based on the water displacement method.
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How many electrons can sulfur have in a Lewis structure?
The periodic table shows that sulphur (S), which is in Period 3, can have an extended octet and more than 8 valence electrons and 2,8,6 in a Lewis structure.
How would you define the Lewis structure using an example?The octet rule, which dictates that atoms share electrons so that each has eight in its outer shell, is the cornerstone of a Lewis structure. For particular, the outer shell of an oxygen atom has six electrons.
Why is it possible for sulphur to possess more than 8 electrons?Sulfur needs utilize multiple orbitals in addition to the ns and np valence orbitals in order to contain more than eight electrons. In principle, sulphur could contain more than eight valence electrons by occupying one or more d orbitals related to its [Ne]3s23p43d0 electron configuration.
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3. Kevin has an unknown element. He wants to find out whether it is a metal or
a non-metal. He heats the substance on one end and the other end gets hot very
quickly. The element is orange in colour and its surface is shiny.
a. Do you think it is a metal or a non-metal?
b. What piece of evidence from the above given information made you decide this?
Explain with respect to the properties of metals and non-metals.
a) The unknown element that Kevin has is a metal.
Since the unknown element conducts heat, burns with a colored flame, and has a shiny surface- these are the characteristic properties of metals.
b)The piece of evidence that helped to decide was the conduction of heat, orange-colored flame, and shiny surface.
The information provided states that the element is a good conductor of heat as the other end gets heated and burns with an orange-colored flame and also has a shiny surface. These properties confirm that the element is Metal.
Properties of metal-
Metals are good conductors of heat and electricity.Most metals burn with a colored flame.Metals have shiny surfaces.Metals are malleable.Metals are ductile.Properties of non-metal-
Non-metals are poor conductors of heat and electricity.Non-metals do not burn with a colored flame.Non-metals do not have shiny surfaces.Non-metals are not malleable.Non-metals are non-ductile.From the properties stated it is confirmed that the unknown element is a metal.
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what happens when sodium and sulfur combine
Answer:
It emits hydrogen sulfide...smells like rotten eggs..
ty:)pls let me know whether this is ryt:D
Answer:
Hey!
Your answer is that it creates hydrogen sulfide gas / liquid...
Which really smells...
Explanation:
HOPE THIS HELPS!
True or False:
If a chemical is used in a chemical reaction as a reactant but no
products are formed and nothing changes about the chemical,
it is safe to assume it has no chemical properties.
Answer:
i think true ..........................................
How many electrons are being exchanged in the balanced redox equation
Co + 3Ag+→ Co3+ + 3Ag?
Answer:
Mad science
Explanation:
In the balanced redox equation:
Co + 3Ag+ → Co3+ + 3Ag
The number of electrons being exchanged can be determined by examining the change in oxidation states of the elements involved.
On the left side of the equation, the oxidation state of cobalt (Co) is 0, while the oxidation state of silver (Ag) is +1.
On the right side of the equation, the oxidation state of cobalt is +3, and the oxidation state of silver remains +1.
To balance the equation, cobalt gains 3 electrons (from an oxidation state of 0 to +3), while each silver ion loses 1 electron (from an oxidation state of +1 to 0). Since there are 3 silver ions involved, a total of 3 electrons are being exchanged.
Therefore, in the balanced redox equation, 3 electrons are being exchanged.
Answer: i dont know about the other person but i got 2 that are exchanged.
The community of a pond is made up of all the...
O abiotic factors in the water.
O resources organisms need.
O the surrounding ecosystem in and around the water.
O populations of fish and other living organisms in their natural habitat.
the activities of chromatography adsorbents (stationary phases) such as silica and alumina are greatly affected by their water content. the most active adsorbents are those that contain the least amount of moisture. why is this the case?
The activities of chromatography adsorbents (stationary phases) such as silica and alumina are greatly affected by their water content. The most active adsorbents are those that contain the least amount of moisture. The reason why this is the case is given below:
Chromatography adsorbents: Chromatography adsorbents or stationary phases are the materials in a chromatography column that play a significant role in separating the components of a mixture. The stationary phase interacts with the analyte molecules to bind them selectively and separate them based on the different affinities for the stationary phase.
The importance of water content: Water content is essential for the activity of chromatography adsorbents. The water molecules participate in hydrogen bonding with the surface groups of the adsorbent, allowing for enhanced selectivity of adsorption.
However, a large amount of water reduces the activity of the adsorbent due to the following reasons:
1. The presence of too much water can cause the polar and nonpolar properties of the adsorbent surface to be weakened, making it less active .
2.The polar groups on the adsorbent surface become saturated with water, making it more difficult to interact with the solute molecules and limiting the capacity of the adsorbent for adsorption.
3. The polar properties of the solute molecules are also reduced by the presence of excess water, reducing their affinity for the adsorbent.
Therefore, the most active adsorbents are those that contain the least amount of moisture.
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The graph below shows how the amount of carbon dioxide (CO2) in our atmosphere has changed since 1960. A graph that plots the amount of atmospheric carbon dioxide in the atmosphere from 1960 to approximately 2005. The x-axis shows the time in years. The y-axis shows the carbon dioxide concentration in parts per million. The concentration is increasing over time. Based on the information given in the graph, which of these phenomena has likely increased since 1960?
land erosion
coastal erosion
ozone depletion
greenhouse effect
Answer:
greenhouse effect
Explanation:
Answer: greenhouse effect
Explanation:
the greenhouse effect increases the Earths temperature which is why there is an increase in CO2
How much heat must be transferred to 55 g of ice to change the ice's
temperature from -13°C to -5.0°C? (The specific heat capacity of ice is 2.11
J/g.°C)
Calcium carbide, CaC2, is manufactured by reducing lime with carbon at high temperature. (The carbide is used in turn to make acetylene, an industrially important organic chemical.) CaO(s)+3C(s)→CaC2(s)+CO(g) ΔH=464.8kJ Calculate the quantity of energy, in MJ, transferred when a metric ton(1000 kg) of CaC2(s) is manufactured. Ca = 40 g/mol C = 12 g/mol O = 16 g/mol
The energy of the carbide released is 7262.5MJ.
What is the energy?We know that the reaction between calcium oxide and carbon occurs in accordance with the reaction; \(CaO(s)+3C(s)----- > CaC_{2} (s)+CO(g)\). The reaction is seen to produce 464.8kJ of energy per mole of carbide produced.
Number of moles of \(CaC_{2}\) produced = 1000 * 10^3 g/64 g/mol
= 15625 moles of calcium carbide
If 1 mole of \(CaC_{2}\) transfers 464.8 * 10^3 J
15625 moles of calcium carbide transfers 15625 moles * 464.8 * 10^3 J/ 1 mol
= 7262.5MJ
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During an experiment vinegar was added to baking soda. the following observations were recorded.
observation 1: the container with the reaction mixture feels cooler.
observation 2: gas bubbles are released.
based on the observation, justify the type of change (physical or chemical) that took place. (4 points)
When vinegar was added to baking soda, A new product is formed as foam. Hence, it is s a chemical change.
What is chemical change ?A chemical change results from a chemical reaction forming new products while a physical change is when matter changes forms but not chemical identity.
Foam up with carbon dioxide gas,all of baking soda can be made react and disappear into vinegar solution and thus chemical reaction completes.
Hence, When vinegar was added to baking soda, A new product was formed Hence, it is s a chemical change.
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Question 1 (1 point)
A new element has been discovered at Archer High School. The element symbol is Zz
and it has 2 naturally occurring isotopes.
The first isotope has a mass of 85.96 amu and a percent abundance of 87.20%.
The second isotope has a mass of 86.78 amu.
What is the average atomic mass of element Zz? Round to the hundredth's place
(0.01 or 2 decimal places).
Your Answer:
Answer
units
Answer:
86.06 amu is the average atomic mass of element Zz.
Explanation:
We may find the average atomic mass of Zz with a simple thought experiment. Let's imagine that we were given 100.0 grams of Zz. We know that 87.20% of that 100.0 grams is an isotope having 85.96 AMU (atomic mass units). That means the other 12.80% must be the isotope with 86.78 AMU.
Since we picked 100.0 grams, it is easy to see that we would have:
87.2 grams of 85.96 AMU, and
12.8 grams of 86.78 AMU
-----------
100.0 grams total
The contribution of each isotope can be calculated by taking it's percent abundance times it's AMU andf then adding the total results:
AMU % Contribution to total AMU
85.96 87.2 74.96
86.78 12.8 11.11
-------- --------- -----------
100.0 86.06 amu
The sum of the two weighted averaged amu numbers is the average atomic mass of element Zz. [Element Zz has a good futire as a sleep aid.]
under which conditions do you expect helium gas to deviate most from ideal behavior?
Answer:
Explanation:
[2-0] NC Special Operation
[2] Supervisor
[2-1] Emergency Response
[2-2] Juggernaut
[2-3] Commander
[2-4] Division Director
Question 2 options: The Galápagos tortoises are native to seven of the Galápagos Islands, a volcanic archipelago about 620 miles west of the Ecuadorian mainland. With lifespans in the wild of over ____________years, it is one of the longest-lived vertebrates. A captive individual lived at least ______________years!
Answers:
in the wild of over 100 years,...
A captive individual lived at least 255 years!
Explanation:
The giant Galapagos tortoises (Chelonoidis nigra) are famous because this species was observed by Darwin during his travel. This species is native from the Galapagos Islands and currently is in danger of extinction. Galapagos tortoises are recognized as one of the longest vertebrates. In this regard, it is worthy to note that a giant tortoise named Harriet lived 255 years, this specimen was in the Australian Zoo.
in the electron transport chain, why is an electron passed along one carrier to another? question 6 options: because a redox potential exists between the carriers. due to an electrical charge present between pairs. because a terminal electron acceptor is not present. due to a static charge built up that moves between.
Electrons are passed along one carrier to another in the electron transport chain due to the redox potential that exists between the carriers.
The inner mitochondrial membrane contains a number of protein complexes that make up the electron transport chain. The electrons are passed from one carrier molecule to another as they proceed along this chain. This transfer happens as a result of the redox potential, which is a molecule's propensity to accept or give out electrons.
A gradient of electron transfer results from the various redox potentials of each carrier in the electron transport chain. The development of a proton gradient, which is necessary for the creation of ATP during oxidative phosphorylation, is made possible by the passage of electrons from carrier to carrier. As a result, the redox potential differences between the carriers are what cause electrons to move along them.
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A 2.00L mixture of helium, nitrogen, and neon has a total pressure of 815 mmHg at a
temperature of 255K. If the partial pressure of helium is 201 mmHg and the partial
pressure of nitrogen is 351 mmHg, what is the partial pressure of neon in the mixture?
O 709 mmHg
O 512 mmHg
O 667 mmHg
O 263 mmHg
Answer: The partial pressure of neon in the mixture is 263 mm Hg
Explanation:
According to Dalton's law, the total pressure is the sum of individual pressures.
\(p_{total}=p_{He}+p_{N_2}+p_{Ne}\)
Given : \(p_{total}\) =total pressure of gases = 815 mm Hg
\(p_{He}\) = partial pressure of helium = 201 mm Hg
\(p_{N_2}\) = partial pressure of nitrogen = 351 mm Hg
\(p_{Ne}\) = partial pressure of Neon = ?
putting in the values we get:
\(815mm Hg=201 mm Hg+351 mm Hg+p_{Ne}\)
\(p_{Ne}=263mmHg\)
The partial pressure of neon in the mixture is 263 mm Hg
Which of the following pH numbers are acidic? (Choose 2)
9
11
7
5
3
the pH numbers that are acidic above is 3 and 5
in terms of bonds, what would the molecule C3H6 be classified as
Explanation:
Cyclopropane is a cycloalkane conposed of three carbon atoms to form a ring. It has a rols as an inhalation anaesthetic. It is a cycloalkane and a member of cyclopropanes.
Answer:
Alkane
Explanation:
Determine the products of the reaction between tin(ii) oxalate and lithium chloride
The reaction between tin (II) oxalate and lithium chloride is that it forms tin (II) chloride and lithium oxalate, which are the products of the reaction. The balanced chemical equation for the reaction is SnC₂O₄ + 2 LiCl → SnCl₂ + Li₂C₂O4.
Tin (II) oxalate reacts with lithium chloride to form a precipitate of tin (II) chloride and lithium oxalate. The reaction between tin (II) oxalate and lithium chloride is given below.
SnC₂O₄ + 2 LiCl → SnCl₂ + Li₂C₂O4
The balanced chemical equation for the reaction is as follows:
SnC₂O₄ + 2 LiCl → SnCl₂ + Li₂C₂O4 .
SnC₂O₄ is tin (II) oxalate, while LiCl is lithium chloride.
SnCl₂ is tin (II) chloride, while Li₂C₂O4 is lithium oxalate.The products of the reaction between tin (II) oxalate and lithium chloride are tin (II) chloride and lithium oxalate. Tin (II) chloride is a white crystalline powder that is soluble in water, whereas lithium oxalate is a white solid that is insoluble in water.The reaction between tin (II) oxalate and lithium chloride is a double displacement reaction, which is also known as a metathesis reaction. When a double displacement reaction takes place, two compounds exchange their cations and anions, resulting in the formation of two new compounds.
The reaction is a double displacement reaction or metathesis reaction where two compounds exchange their cations and anions to form two new compounds.
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What is OXIDATION, BREATHING and RESPIRATION?
Answer:
Oxidation: The combustion of food and releasing energy in the presence of oxygen is called oxidation. Breathing: The process of taking oxygen and throwing carbon dioxide is called breathing. Respiration: The process of burning of food taken by organisms in the body to release energy is called respiration.####
Answer:
These are the answers:.
\(OXIDATION-\) is the loss of electrons during a reaction by a molecule, atom or iron.\(BREATHING-\) this is involves moving air in and out of the lungs for gas exchange with our environment taking in oxygen and bringing out carbon dioxide.\(RESPIRATION-\) movement of oxygen from outside to cells and the transport of carbon dioxide in opposite direction.Explanation:
Respiration has many meanings.
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