When solid copper(II) nitrate is dissolved in water, it breaks down into copper(II) ions and nitrate ions. This process is represented by the balanced chemical equation: Cu(NO3)2 (s) -> Cu^2+ (aq) + 2 NO3^- (aq).
Explanation:When solid copper(II) nitrate, denoted as Cu(NO3)2, is put into water, it dissociates into its ions. The balanced chemical reaction is represented as follows:
Cu(NO3)2 (s) -> Cu^2+ (aq) + 2 NO3^- (aq)
Here, (s) stands for solid, while (aq) means aqueous, i.e., ions dissolved in water. Copper(II) nitrate breaks down into copper(II) ions (Cu^2+) and nitrate ions (NO3^-). Because copper(II) nitrate is a strong electrolyte, it dissociates completely in water, meaning there are no leftover solid particles floating in the solution, just a solution of the individual ions.
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You find small pieces of ice instead of ice cubes in the freezer. State how this is possible.
The appearance of small pieces of ice instead of ice cubes in the freezer can happen through a process called sublimation, in which ice transitions directly into a gaseous state, additionally influenced by thermal equilibrium as per the second law of thermodynamics.
Explanation:Finding small pieces of ice instead of ice cubes in the freezer could be due to a process called sublimation, in which solids transition directly into the gaseous state, bypassing the liquid state. This is a common phenomenon for snow and ice at temperatures below the melting point of water. It's a slow process that can be accelerated by reduced atmospheric pressure in the freezer or sporadic variations in the temperature of the freezer. The varying conditions inside the freezer could cause ice cubes to break down into smaller pieces of ice.
Another contributing factor could be the thermal equilibrium dictated by the second law of thermodynamics. This law predicts that after heat transfers energy from the warmer freezer air to the colder ice, the components will eventually reach a thermal equilibrium. The continual transfer of energy could cause the ice cubes to reduce in size over time.
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How many electrons sub orbitals and electrons are in an a s orbital
There are four sublevels s, p, d ,f 2 in the s
The number of min. In 30-day month can be calculated as follows:
There are 60 seconds in a minute. There are 60 minutes in an hour. There are 24 hours a day. There is 86400 seconds per day (24 hours). There are 168 hours per week (7 days). There are 720 hours in 30 days. 86,400 seconds divided by 60 seconds is 1440 seconds. 1440 seconds times 30 days is 43,200 minutes.
That gives us the answer.. 43,200 minutes are in 30 days.
131400 hope it helps.
Which equations represent precipitation reactions?
Na2S + FeBr2 → 2NaBr + FeS
MgSO4 + CaCl2 → MgCl2 + CaSO4
LiOH + NH4I → LiI + NH4OH
2NaCl + K2S → Na2S + 2KCl
AgNO3 + NaCl → AgCl + NaNO3
Multiple answers
Answer:
Na₂S + FeBr₂ → 2NaBr + FeS(s)
MgSO₄ + CaCl₂ → MgCl₂ + CaSO₄(s)
AgNO₃ + NaCl → AgCl(s) + NaNO₃
Explanation:
You must recall the pertinent solubility rules:
Salts of Group 1 elements (Li⁺, Na⁺, K⁺) and of NH₄⁺ are soluble Salts containing nitrate ion (NO₃⁻) are soluble. Salts containing Cl⁻, Br⁻, and I⁻ are generally soluble. An important exception is Ag⁺. Thus, AgCl is insoluble. Most sulfate (SO₄²⁻) salts are soluble. An important exception is CaSO₄, which is insoluble. Most sulfide (S²⁻) salts of transition metals are insoluble.Na₂S + FeBr₂ → 2NaBr + FeS(s)
NaBr is soluble (Rule 1). FeS is insoluble (Rule 5), so a precipitate forms.
MgSO₄ + CaCl₂ → MgCl₂ + CaSO₄(s)
MgSO₄ is soluble (Rule 3). CaSO₄ is insoluble (Rule 4), so a precipitate forms.
AgNO₃ + NaCl → AgCl(s) + NaNO₃
NaNO₃ is soluble (Rule 1). AgCl is insoluble (Rule 3) so a precipitate forms.
LiOH + NH₄I → LiI + NH₄OH and 2NaCl + K₂S → Na₂S + 2KCl
All products are soluble (Rule 1), so these are not precipitation reactions.
HEY I GOT YO ANSWER
THE ANSWERS ARE A B AND DA LAST ONE
What are the main specialized subunits of cells. They compartmentalize and make the cell work.
a. carbohydrates
b. proteins
c. organelles
d. amino acids
a i took this test yesterday.
Answer: Organelles
Explanation:
The cell organelles are the basic structure that is present inside every cell which helps the cell to perform its survival activities and processes.
The various types of organelles in the cell helps in performing various functions. Such as the mitochondria helps in the conversion of carbohydrates into adenosine triphosphate.
The Golgi body in the cell helps in the sorting and modification of proteins. It helps in the transport the secretion of the cells after modifications.
Hence, the correct answer is Organelles.
Which atom or ion is the largest?
A.
K
B.
K+
C.
Ca
D.
Ca2+
E.
Li
i think its either C or E
The elements beryllium, calcium, and strontium are all in group 2. What is the correct relationship of these elements regarding their ionization energy?
A.
Ca < Be < Sr
B.
Sr < Be < Ca
C.
Be < Ca < Sr
D.
Sr < Ca < Be
E.
Ca < Sr < Be
Which substances are made up of polymers?(PICK MORE THEN ONE YALL)
DNA
a glass bottle
ice crystals
the proteins in hair
rubber car tires
Size
As the charge increases (becomes more positive), the size decreases.
Also the number of protons and electrons matters in the atom itself. Li will have the smallest size because their are not that many electrons to repulse as say the Ca and K.
The largest member of that group is the one having the most number of electrons and is not an ion. In general the higher the charge, the smaller the radius.
K > K+ > Ca2+
Answer: A
Ionization Energy
As you go down the periodic table staying in the same column of the periodic table it takes LESS energy to break the outer shell electrons away. So the correct order for the column II elements is something like D.
Be is closest to the top of the periodic table and has the highest ionization energy
Ca is the next closest to the top and has a medium size ionization energy
Sr has the lowest ionization energy.
Answer C is backwards.
Answers A B and E are all in the wrong order of moving down Column II. The comment applies to staying in the same column and moving from top to bottom.
Polymers
A polymer is a complex combination of Carbon, Hydrogen and Oxygen (mainly). Other elements are possible but the majority is the listed ones.
DNA is a polymer
A glass bottle is made from SiO2 and is not a polymer
Ice crystals are actually water molecules. Those crystals are not polymers
Hair Proteins (like wool and silk) are made of polymers.
Rubber used for car tires are polymers.
You should count 3 items as your answer.
Answer:
AK
Explanation:
The average weather pattern of a region over a long period of time is known as
weather
climate
elevation
conditions
Answer:
Climate
Explanation:
Weather is like the temperature over time
The elevation is height like the elevation on a mountain
Conditions like its rainy or cloudy
Climate is the certain weather over a period of time.
The average weather pattern of a region over a long period of time is known as climate. The changes in climate occurs due to the change in heat and light radiated from sun.
What is weather?Weather is the scientific term used to indicate the atmospheric condition of a region over a short period of time. The difference in weather depends on the landscape of the region.
The different weather condition occurs in different latitudes of earth due to the difference in the heat and light radiated to these regions. The tilted axis of earth makes the heat radiation impact differently in each poles of earth.
The average weather pattern of a region over a long period of time is known as climate. The changes in climate occurs due to the change in heat and light radiated from sun. Climates of various ecosystems alters with respect to the peculiarities of the biosystems there.
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How would adding the catalyst nitrogen monoxide (NO) affect this reaction?
2SO2(g) + O2(g) → 2SO3(g)
A.
NO increases the rate at which SO3 molecules are formed.
B.
NO reacts with SO3 to produce more SO2 molecules.
C.
NO decreases collisions between the SO2 and O2 molecules.
D.
NO increases the concentration of the SO2 and O2 molecules.
E.
NO increases the activation energy of the SO2 and O2 molecules.
Answer: A. NO increases the rate at which [tex]SO_3[/tex] molecules are formed.
Explanation: The catalyst makes it possible for the reaction to take place by another path that makes possible reaction at a lower energy.
Activation energy is the extra energy that must be supplied to reactants in order to cross the energy barrier and thus convert to products.
A catalyst is a substance which increases the rate of a reaction by taking the reaction through a different path which involves lower activation energy and thus more reactants [tex](SO_2)[/tex] and [tex](O_2)[/tex] undergo collision and can cross the energy barrier and convert to products [tex](SO_3)[/tex]
Thus NO increases the rate at which [tex]SO_3[/tex] molecules are formed.
Answer:
The answer above is correct
A. NO increases the rate at which molecules are formed.
Explanation:
Think about the lab procedure you just read. Label each factor below with V for “variable” or C for “constant”.
The temperature of the gas:
The amount of gas in the tube (in terms of mass and moles):
The radius of the tube:
The temperature of the gas (changed by the water surrounding it):
The type of gas:
The pressure of the gas:
Answer:
answer in picture
Explanation:
Each factor listed is classified as either a variable or constant based on how it is treated in gas behavior experiments, which helps in understanding the ideal gas law.
Explanation:When considering the lab procedure related to the behavior of gases, we can label each factor with 'V' for variable or 'C' for constant, based on the information provided about gas laws.
Early scientists studied the relationship between gas variables, holding some factors constant while varying others to observe the effects on gas behavior—this concept is crucial in understanding the ideal gas law and gas properties.
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crystals that can be toxic if inhaled and cause serious respiratory problems
why hello there
It depends of what kind of mineral you inhale if you inhale one of thease 9 you are in risk of dying
ChalcanthiteStibniteAsbestosArsenopyriteCinnabarGalenaHutchinsoniteOrpimentTorberniteIf my answer helped please mark me as brainliest thank you and have the best day ever!
Put the following molecules in order from least kinetic energy to greatest
Cool water
Frozen water
Warm water
Water vapor
Frozen water,cool water,warm water,water vapor.
Final answer:
The order from least to greatest kinetic energy of water in different states is frozen water (ice), cool water, warm water, and water vapor, in accordance with the kinetic molecular theory which relates temperature and phase of matter to kinetic energy.
Explanation:
To rank the different states of water according to their kinetic energy from least to greatest, we must understand that kinetic energy is related to the temperature and phase of matter. The kinetic molecular theory (KMT) explains that as the temperature increases, so does the kinetic energy of the molecules in a substance. Therefore, molecules in the solid phase (ice) have the least kinetic energy because they are at the lowest temperature, while molecules in the gaseous phase (water vapor) have the most kinetic energy due to the highest temperature.
Frozen water (Ice) - Solid state with the lowest kinetic energy.
Cool water - Higher kinetic energy than ice, as it is a liquid at a lower temperature.
Warm water - Even higher kinetic energy, as it is liquid at a higher temperature.
Water vapor - Gas state with the highest kinetic energy.
Thus, the correct order from least to greatest kinetic energy is: frozen water (ice), cool water, warm water, and water vapor.
Enthalpy of reaction SiCl4(l)+2H2O(l)?SiO2(s)+4HCl(g)
The question involves calculating the enthalpy of reaction (ΔH) for the conversion of SiCl4 and H2O to SiO2 and HCl, focusing on the energy changes associated with bond breaking and formation during this chemical reaction.
Explanation:The question refers to the enthalpy of reaction for the process in which silicon tetrachloride (SiCl4) reacts with water (H2O) to produce silicon dioxide (SiO2) and hydrochloric acid gas (HCl). This reaction can be represented as:
SiCl4(l) + 2H2O(l) → SiO2(s) + 4HCl(g)
To understand the enthalpy change (ΔH) of this reaction, one needs to consider the bond energies involved in breaking and forming chemical bonds during the reaction. The process of calculating ΔH for a reaction involves understanding the energy required to break bonds in the reactants and the energy released by forming bonds in the products.
Silicon tetrachloride is a covalent tetrahedral molecule that engages in reactions leading to the formation of silicon dioxide and hydrochloric acid gas when exposed to water. This type of reaction is exothermic if the energy released in forming the products' bonds is greater than the energy required to break the reactants' bonds. Calculating the exact ΔH would require specific values of bond energies, which are not provided here.
The enthalpy of reaction for SiCl₄(l) + 2H₂O(l) → SiO₂(s) + 4HCl(g) is calculated to be -66 kJ.
This involves using the enthalpies of formation for each compound. The result indicates an exothermic reaction.
To determine the enthalpy of reaction for the given chemical equation, we need to use the known enthalpies of formation for each compound involved:
SiCl₄(l)2H₂O(l)SiO₂(s)4HCl(g)The enthalpy of the reaction (ΔHrxn) is calculated using the formula:
ΔHrxn = ΣΔHf(products) - ΣΔHf(reactants)
Assuming standard enthalpy of formation (ΔHf) values as follows:
SiCl₄(l): -640 kJ/molH₂O(l): -286 kJ/molSiO₂(s): -910 kJ/molHCl(g): -92 kJ/molThe enthalpy of the reaction would be calculated as:
ΔHrxn = [(-910) + 4(-92)] - [(-640) + 2(-286)] kJ
That simplifies to:
ΔHrxn = (-910 - 368) - (-640 - 572) kJ = -1278 + 1212 kJ = -66 kJ
Thus, the enthalpy of the reaction is -66 kJ.
How many grams are in 2.570 kilograms? (Give your answer in standard form.)
2.57 kilograms = 2570 grams
i think this is standard form but i don't know 100%
Remember that there are 1000 grams in 1 kilogram.
Multiply 1000 grams with 2.570 kilograms
1000 x 2.570 = 2570
2570 grams are in 1 kilogram
hope this helps
Please help WILL MARK BRAINLIEST can someone explain to me what happens when thermal energy is added to a state of matter?!
Well it depends, if you add heat to ice it will melt, if you add heat to water it will evaporate.
Hope it helps!
Why hello there, Lithommie
Your question: can someone explain to me what happens when thermal energy is added to a state of matter?
My answer:
Very good question
lets take a look at what happens when thermal energy is added to a state of matter.
In this case lets look at a football game, at the beginning of the game the players represent the state SOLID the scores 0-0 and the heat is on. Remember the players are solid and when they are melting into a liquid by the end of the game and the players are mixing through the field and collapsing with one another and by the end of the game they become liquid.
Do you understand more clearfully? If you add heat to ice( the solid ) it melts and becomes water( The liquid )
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What makes a compound different from a molecule?
A.
contains 2 or more atoms
B.
held together by chemical bonds
C.
use of chemical symbols
D.
contains 2 or more different elements
When salt is added to water, all of the following happen except A. the water molecules surround the dissociated ions. B. the positive part of the water molecule is attracted to the negative ions. C. the negative part of the water molecule is attracted to the positive ions. D. the salt breaks into positive chlorine ions and negative sodium ions.
Answer: Option (d) is the correct answer.
Explanation:
When salt is added to water then the sodium and chlorine ions dissociate.
After the dissociation, both the positive and negative ions that is the sodium and chlorine ions will be surrounded by the water molecules. Thereafter, the positive part of water molecule will be attracted to the negative ions that is the chlorine ions and vice versa.
As sodium ion is a cation so it will hold a positive charge, and chlorine ion is an anion so it will hold a negative charge.
Thus, it can be concluded that when salt is added to water, all of the above will happen except option (d) that is the salt breaks into positive chlorine ions and negative sodium ions.
The equilibrium system described by this equation has reactant molecule(s) and product gas molecule(s).
The given equilibrium system has the number of reactant molecules are 4, and the number of product molecules are 2.
Equilibrium has been the condition that has been marked with the presence of equal number of product and reactant.
Equilibrium systemThe given reaction has been:
[tex]\rm N_2\;+\;3\;H_2\;\leftrightharpoons\;2\;NH_3[/tex]
The number of atoms of each molecule on the product and the reactant side has been equal. The number of molecules has been the repeating unit for reactant and product.
The number of molecules on the reactant side has been the sum of hydrogen and nitrogen molecules. The number of hydrogen has been 3, while the number of nitrogen has been 1.
The total number of reactant molecule has been 4.
The number of product molecules, are 2 molecules of ammonia.
Thus, in the given equilibrium system, the number of reactant molecules are 4, and the number of product molecules are 2.
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The measurement 6.4x10^3 g also could be writen as
The measurement 6.4x10^3 g could be written as 6.4 kg in kilograms and as 6.4x10^6 mg in milligrams, considering the unit conversions.
Explanation:The measurement 6.4x10^3 g can be expressed in other units. The use of scientific notation, such as 6.4x10^3, helps us write very large or very small numbers in a more manageable way. This notation means that you are multiplying 6.4 by 10 raised to the power of 3, or in other words, adding three more zeros to 6.4, which results in 6400.
To convert it to kilograms, we need to remember that 1 kilogram is equal to 1000 grams. So, we can divide the number of grams by 1000 to get the measurement in kilograms. Hence, 6.4x10^3 g = 6.4 kg. Similarly, we can convert it to milligrams, remembering that 1 gram equals 1000 milligrams, which results in 6.4x10^3 g = 6.4x10^6 mg.
Note:
Always remember to check the magnitude of the units you are converting to ensure accuracy.
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CAN SOMEONE PLEASE HELP?
How many orbitals are completely filled in an atom whose electron configuration is 1s^2 2s^2 2p^6 3s^1?
Hey there!:
The 1s, 2s and 2p subshells are completely filled (a maximum of two electrons go into the 1s subshell and a maximum of two electrons go into the 2s subshell. The 2p subshell includes 3 orbitals, with 2 electrons maximum per orbital). The 3s subshell has only one of a maximum of two electrons.
Hope that helps!
How did Dmitri Mendeleev deal with elements that had not yet been discovered?
He left blanks for them in his periodic table, as he predicted they would be discovered.
He created them in his laboratory and placed them in his table.
He ignored them, placing them in the table and shifting others when they were discovered.
He gave them names and properties and placed them in the table.
A. He left blanks for them in his periodic table, as he predicted they would be discovered.
16) Which of these is a physical property? A) boiling point B) flamability C) reactivity D) toxicity
a physical property would be a. boiling poing
Answer: A) boiling point
Explanation:
Chemical property is defined as the property of a substance which is observed during a reaction where the chemical composition identity of the substance gets changed.
Physical property is defined as the property which can be measured and whose value describes the state of physical system. For Example: State, density etc.
Boiling point is a physical property as it involves change of state.
Flammability is a chemical property as there is formation of new substances.
Reactivity is a chemical property as there is formation of new substances.
Toxicity is a chemical property as there is formation of new substances.
Which of the following properties is not unique to water?
Surface Tension
Viscosity
Density
Adhesion
Answer:
Density
Explanation:
Density is not unique only to water. All liquids have density. Liquids have density either higher or lower than that of water. All liquids have mass and they occupy the volume of the container in which they are kept. Density is the ratio of mass to volume.
Density = mass/ volume.
As all liquids have mass and volume they also have density.
If 50.0 ml of naoh solution is required to react completely with 1.24 g khp, what are the molarity and normality of the naoh solution?
Answer:- Molarity = 0.121M and normality = 0.121N.
Solution:- KHP that is potassium hydrogen phthalate reacts with sodium hydroxide as:
[tex]NaOH+KHP\rightarrow NaKP+H_2O[/tex]
From this equation, they react in 1:1 mol ratio. Grams of KHP are given so we could convert them to moles and the moles of NaOH would also be equal since the mol ratio is 1:1. Molar mass of KHP is 204.2 gram per mol.
[tex]1.24gKHP(\frac{1mol}{204.2g})(\frac{1molNaOH}{1molKHP})[/tex]
= 0.00607 mol NaOH
Volume of NaOH solution is 50.0 mL that is 0.0500 L. Molarity is moles of solute per liter of solution. So, let's divide the moles by the liters to get the molarity.
[tex]molarity=\frac{0.00607mol}{0.0500L}[/tex]
= 0.121 M
The molarity of NaOH solution is 0.121 M.
Normality is the grams equivalent per liter of solution.
For a base, normality = molarity* acidity
acidity means how many hydroxide ions would be given out from the base. It could also be calculated on dividing the molecular weight of the compound by it's equivalent weight.
Acidity of NaOH is 1 as it has only one OH present in it.
So, normality = 0.121(1) = 0.121 N
The answer is
[tex]\[ \boxed{\text{Molarity} \approx 0.1214 \text{ M}} \] \[ \boxed{\text{Normality} \approx 0.1214 \text{ N}} \][/tex]
To determine the molarity and normality of the NaOH solution, we need to perform a titration calculation. The reaction between NaOH and KHP (potassium hydrogen phthalate) is a neutralization reaction, and the balanced equation is:
[tex]\[ \text{NaOH} + \text{KHC}_8\text{H}_4\text{O}_4 \rightarrow \text{KNaC}_8\text{H}_4\text{O}_4 + \text{H}_2\text{O} \][/tex]
From the equation, we can see that the molar ratio between NaOH and KHP is 1:1.
First, we calculate the moles of KHP that reacted with the NaOH solution:
The molar mass of KHP [tex](\( \text{KHC}_8\text{H}_4\text{O}_4 \))[/tex]is:
[tex]\[ 39.10 (\text{K}) + 1.01 (\text{H}) + 12 \times 12.01 (\text{C}) + 4 \times 16.00 (\text{O}) + 1.01 (\text{H}) = 204.22 \text{ g/mol} \][/tex]
Now, we calculate the moles of KHP:
[tex]\[ \text{moles of KHP} = \frac{\text{mass of KHP}}{\text{molar mass of KHP}} = \frac{1.24 \text{ g}}{204.22 \text{ g/mol}} \approx 0.00607 \text{ mol} \][/tex]
Since the molar ratio between NaOH and KHP is 1:1, the moles of NaOH used in the reaction are also approximately 0.00607 mol.
Now, we can calculate the molarity of the NaOH solution:
[tex]\[ \text{Molarity} = \frac{\text{moles of solute}}{\text{liters of solution}} \][/tex]
Given that 50.0 ml of NaOH solution was used, we convert milliliters to liters:
[tex]\[ 50.0 \text{ ml} = 0.0500 \text{ L} \][/tex]
Then, the molarity (M) is:
[tex]\[ M = \frac{0.00607 \text{ mol}}{0.0500 \text{ L}} \approx 0.1214 \text{ M} \][/tex]
To find the normality (N) of the NaOH solution, we need to consider that normality is the measure of the concentration of a solution in terms of the number of gram equivalents of solute per liter of solution. For NaOH, which is a strong base, the gram equivalent weight is the same as its molar mass because it provides one mole of [tex]OH^-[/tex] ions per mole of NaOH.
The molar mass of NaOH is:
[tex]\[ 23.00 (\text{Na}) + 16.00 (\text{O}) + 1.01 (\text{H}) = 40.01 \text{ g/mol} \][/tex]
Since the gram equivalent weight of NaOH is the same as its molar mass, the normality is equal to the molarity:
[tex]\[ N = M \approx 0.1214 \text{ N} \][/tex]
Therefore, the molarity and normality of the NaOH solution are both approximately 0.1214.
Which element or compound has lost electrons in this oxidation-reduction reaction?
4Li + 2CoO → 2Co + 2Li2O
A. CoOB. Li2OC. LiD. CoE. OAnswer: The correct answer is Option C.
Explanation:
Oxidation reaction are the reactions in which an element or compound looses electrons and the element that looses electrons is known as oxidized species. The oxidation state of the species is increased for these kind of reactions.
[tex]X\rightarrow X^{n+}+ne^-[/tex]
Reduction reaction are the reactions in which an element or compound gains electrons and the element that gains electrons is known as reduced species. The oxidation state of the species gets reduced for these kind of reactions.
[tex]X^{n+}+ne^-\rightarrow X[/tex]
For the given chemical reaction:
[tex]4Li+2CoO\rightarrow 2Co+2Li_2O[/tex]
On reactant side:
Oxidation state of lithium = 0
Oxidation state of cobalt = +2
Oxidation state of oxygen = -2
On product side:
Oxidation state of lithium = +1
Oxidation state of cobalt = 0
Oxidation state of oxygen = -2
As, oxidation state of lithium is increasing, it is loosing electrons and thus it is undergoing oxidation reaction and the oxidation state of cobalt in reducing, it is gaining electrons and thus it is undergoing reduction reaction .
Hence, the correct answer is Option C.
Answer:
C. Li
Explanation:
How many significant figures are in 136,000 ml?
Answer:
There are 3 sig figs
Explanation:
Sig figs are the amount of figures counting from the left side of the number until you reach the first zero. Starting from the left, I counted one, three, and six. That's 3 numbers, and therefore, that's how we got our answer. The only exception is when there is a decimal. Then all the numbers before the decimal, despite whether or not they're zeros, are sig figs.
Answer:
3 significant figures
Explanation:
The significant figure is such that every number after it is zero. As such, when a number is given to be rounded to a x significant numbers, the count starts from the left with the first number on the left being the first significant number and others following through i.e the next being the second significant number.
However, to round off to x significant number, we consider the number in the x+1 position. If the number is up to 5, it will be rounded ( as well as every other numbers to the right) to zero but 1 will be added to the number in the x position.
Given the theory, 136,000 ml has 3 significant figures.
Use the Periodic Table. Choose the correct electron configuration of carbon using the data shown in the electron configuration chart. 1s22s22p1 1s22s22p4 1s22s22p2 1s22s12p2
I think I have done a question like this before and i'm pretty sure your answer would be the 2nd one 1s22s22p4. I'm not 100% sure but try it at least.
Answer:
electron configuration of carbon: 1s²2s²2p²
Explanation:
The electron configuration of atoms (or ions) is depicted based on the Aufbau principle according to which electrons are added to various orbitals such that the orbital with the lowest energy gets occupied first followed by the next higher orbital.
The energy ordering of orbitals from the lowest to the highest is:
1s < 2s < 2p < 3s < 3p < 4s < 3d ....
s orbitals can accommodate a maximum of 2 electrons
p orbitals = 6 electrons
d orbitals = 10 electrons
Now, the atomic number of carbon = 6
Since it is neutral, the atomic number = number of electrons = 6
Based on the Aufbau principle the electron configuration of C would be
1s²2s²2p²
what is the freqency of light if its wavelength is 5.4 x 10^-4 m
Using the formula as frequency = speed of light/ wavelength of light
f = c/λ
Where c = [tex]3.0 X 10^{8}[/tex] m/s and λ = [tex]5.4 X 10^{-4}[/tex] m
Substituting in above formula we get,
∴ f = [tex]\frac{3.0 X 10^{8}m/s}{5.4 X10^{-4}m}[/tex]
∴f = 5.55 X [tex]10^{13}[/tex] Hz
The frequency will be as 5.55 X [tex]10^{13}[/tex] HzAnswer:
55x 1013x i think im not too sure
Explanation:
A goldsmith melts 12.4 grams of gold to make a ring. The temperature of the gold rises from 26°C to 1064°C, and then the gold melts completely. If gold’s specific heat is 0.1291 joules/gram degree Celsius and its heat of fusion is 63.5 joules/gram, how much energy is gained by the gold?
The gold gains a total of ____ joules of energy.
I was given this by somebody. No idea what to do with this.
QJ=(12.4g*(1064-26)°C*0.1291J/g/°C)+(12.4g*63.5J)
Answer:
The gold gains a total of 2.468 kilo-joules of energy.
Explanation:
Total heat or energy gained by the gold is equal to heat applied and heat required to melt the gold completely.
Total energy = Q+ Q'
Heat of fusion of gold =[tex]\Delta H_{fus} =63.5 joules/gram[/tex]
Mass of gold melted ,m= 12.5 g
Specific heat of gold ,c= 0.1291 joules/gram °C
Change in temperature = ΔT = 1064°C - 26°C = 1038 °C
Heat of applied to the gold = Q
[tex]Q=mc\Delta T[/tex]
[tex]Q'=\Delta H_{fus}\times m[/tex]
Total energy = Q+ Q'
[tex]=12.5 g\times 0.1291 joules/gram ^oC\times 1038 ^oC+63.5 joules/gram\times 12.5 g[/tex]
= 2,468.82 Joule= 2.468 kilo-Joule
The gold gains a total of 2.468 kilo-joules of energy.
In a hypothetical atom, electron N transitions between energy levels, giving off orange light in the transition. In the same atom, electron P gives off violet light when it transitions between energy levels. Did electron N or electron P have a transition that covered a greater energy difference? The electromagnetic spectrum has been provided to assist you in answering the question, and you should reference info from the spectrum in your answer. Be clear and fully explain how you arrived at your answer.
Yes, electron N or electron P have a transition that covered a greater energy difference.
Explanation:N electron giving orange light means light wave of 650 to 700 nm wavelength according to electromagnetic spectrum.P electron giving Violet light means light wave with a wavelength of 400 nm.As wave length and energy of a wave is inversely proportional to each other.It means N electron light with long wavelength has low energy.P electron light with short wave length has high energy.Hence both electrons have transitions of great energy difference.Answer : Electron P has greater energy difference than the Electron N.
Explanation :
Wavelength range of violet light = 400 - 500 nm
Wavelength range of orange light = 600 - 700 nm
The Planck's equation is,
[tex]E=\frac{h\times c}{\lambda}[/tex]
where,
E = energy of light
c = speed of light
[tex]\lambda[/tex] = wavelength of light
According to the Planck's equation, wavelength and energy follow inverse relation. As the wavelength increases, energy decreases.
From the given spectrum, the wavelength of violet light is less. We conclude that When electron P gives violet light on transition it means that energy difference between the energy level was high.
From the given spectrum, the wavelength of orange light is more. We conclude that When electron N gives orange light on transition it means that energy difference between the energy level was low.
So, Electron P which gives violet light on transition has greater energy difference than the Electron N.
What is the empirical formula of a compound composed of 30.5 g potassium (k) and 6.24 g oxygen (o)?
The empirical formula of the compound is K₂O.
Step 1. Calculate the moles of each element
The empirical formula is the simplest whole-number ratio of atoms in a compound.
The ratio of atoms is the same as the ratio of moles.
So, our job is to calculate the molar ratio of K to O.
Moles of K = 30.5 g K × (1 mol K/(39.10 g K) = 0.7801 mol K
Moles of O = 6.24 g O × (1 mol O/16.00 g O) = 0.3900 mol O
Step 2. Calculate the molar ratio of the elements
Divide each number by the smallest number of moles
Ni:F = 0.1552:0.3100 = 2.001:1 ≈ 2:1
Step 3: Write the empirical formula
EF = K₂O
The empirical formula for a compound composed of 30.5 g potassium and 6.24 g oxygen is K2O, as determined by calculating the molar ratio from the given masses and atomic weights.
Explanation:To find the empirical formula of a compound, we first use the provided weights to calculate the mole ratio of the elements in the compound. We start with the mass of each element and convert it to moles by dividing by the atomic weight. In this case, we have 30.5 g of potassium (K = 39.10 g/mol) and 6.24 g of oxygen (O = 16.00 g/mol), which give us approximately 0.780 mol of potassium and 0.390 mol of oxygen.
To get the empirical formula, we then divide each of the mole quantities by the smallest value to get the subscript for each element. Therefore, our mole ratio is 2:1, resulting in the empirical formula being K2O.
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