Compounds with 2 ions bonded are called ionic compounds.
They are held together by the attractions between the positive and negative ions.
What is the formula for a hydrate that contains 5.99 g CuSO4 and 5.4 g H2O?
Final answer:
To find the formula of a hydrate, calculate the molar ratio of CuSO4 to H2O, which for the provided masses is approximately 8:1. Thus, the hydrate formula is CuSO4·8H2O, known as copper(II) sulfate octahydrate.
Explanation:
To determine the formula of a hydrate with given amounts of CuSO4 and H2O, we first need to calculate the molar ratio of the two substances. We do this by finding the number of moles of each substance and dividing them to get their ratio. The molar mass of CuSO4 is 159.61 g/mol, and the molar mass of H2O is 18.02 g/mol. Therefore:
Now we calculate the simplest ratio of moles of H2O to moles of CuSO4, which is 0.2997 mol H2O ÷ 0.0375 mol CuSO4 ≈ 8. Therefore, the compound is copper(II) sulfate octahydrate, and the chemical formula for this hydrate is CuSO4·8H2O.
Name the type of crystalline solid formed from the following structural units and describe how the solid is formed.
i. Metal atoms
ii. Nonmetal atoms
Answer:
Metal: iron, silver, or gold. Made with metallic bonds. Is a Metallic solid.
Nonmetal: diamond. Made with covalent bonds. Is a Network Solid.
Metallic solids are formed by metal atoms through metallic bonding. Nonmetallic solids can be classified as ionic, covalent network, or molecular depending on the type of bond between nonmetal atoms.
Explanation:There are two main types of crystalline solids formed from different structural units.
i. Metal atoms: Metallic solids are formed by metal atoms, which are held together by metallic bonding. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a 'sea' of delocalized electrons. Examples of metallic solids include crystals of copper, aluminum, and iron.
ii. Nonmetal atoms: Nonmetallic solids can be classified into different types, such as ionic solids, covalent network solids, and molecular solids. The specific way in which nonmetal atoms form a crystalline solid depends on the type of bond between the atoms. For example, in ionic solids, nonmetal atoms are held together by ionic bonds, while in covalent network solids, nonmetal atoms are linked by covalent bonds.
The rate constant for the first-order decomposition of n2o is 3.40 s-1. what is the half-life of the decomposition?
a. 0.491 s
b. 0.204 s
c. 0.236 s
d. 0.424 s
e. 0.294 s
Hey There:
First order half life equation :
T 1/2 = ln ( 2 ) /K
T 1/2 = 0.693 / 3.40
T 1/2 = 0.204 s
Answer B
Answer: The half life of the decomposition reaction is 0.204 s
Explanation:
The equation used to calculate half life for first order kinetics:
[tex]t_{1/2}=\frac{0.693}{k}[/tex]
where,
k = rate constant of the reaction = [tex]3.40s^{-1}[/tex]
[tex]t_{1/2}[/tex] = half life of the reaction = ?
Putting values in above equation, we get:
[tex]t_{1/2}=\frac{0.693}{3.40s^{-1}}\\\\t_{1/2}=0.204s[/tex]
Hence, the half life of the decomposition reaction is 0.204 s
Stars, such as our sun, use fusion to combine hydrogen atoms into helium atoms, and in the process, create energy. As massive stars use the last of their helium fuel, they begin to collapse and temperatures climb high enough to fuse other heavier elements. As elements increase in atomic number, the amount of energy required for fusion to occur also increases. Nickel represents the heaviest element that can be produced by fusion due to to the net energy requirements. Two atoms of ___________ could combine by fusion in order to create nickel.
A) hydrogen
B) nitrogen
C) oxygen
D) silicon
Scientists use the emission spectra of elements to detect
A) explosives in luggage.
B) cracks in support structures, like bridges.
C) the possibility of an earthquake occurrence.
D) elements in clouds of gas and dust in deep space
Vanadium has two naturally occuring isotopes - vanadium-50 and vanadium-51. Predict the isotopic mass of vanadium-50 given that vanadium-50 has an abundance of 0.250% and that vanadium-51 has an abundance of 99.750% and a mass of 50.944 amu.
A) 49.944 amu
B) 62.558 amu
C) 63.303 amu
D) 5094.151 amu
Silicon atoms fuse to form nickel in stars. Emission spectra help in detecting elements in deep space. The isotopic mass of vanadium-50 is approximately 49.944 amu.
Stars, including the sun, produce energy by fusing helium and hydrogen together through a process known as nuclear nucleosynthesis.
As stars consume their helium, their temperature escalates, allowing for heavier elements to undergo fusion.
The fusion of two atoms of silicon can yield nickel, which is the heaviest element that can be produced through fusion due to the net energy requirements.
Emission spectra are used by scientists to detect elements in clouds of gas and dust in deep space.
The isotopic mass of vanadium-50 can be obtained using the formula: (mass of isotope × abundance of isotope / total abundance).
Given that vanadium-50 has an abundance of 0.250% and vanadium-51 has an abundance of 99.750% with a mass of 50.944 amu, the isotopic mass of vanadium-50 is approximately 49.944 amu.
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would it be possible to use the color of a natural indicator to measure the ph of maple syrup
Maple syrup is dark in colour.
Natural pH indicators like turmeric or morning glories generally change in colour and indicate the pH of any solution
The pH change is due to high hydronium ion concentration of hydroxide ion concentration.
The pH change is indicated by change in colour by natural indicators which is possible to be observed if we have some light coloured sample / transparent sample to be tested.
In case of maple syrup the colour is so dark that it becomes difficult to observe the colour change in any natural indicator
Match the correct simple with the correct elements of safety
This question involves chemistry, specifically the changes in a chemical reaction. Determine the signs of potential changes for each element by considering if they are gaining or losing electrons. Apply this process carefully and consistently to all elements.
Explanation:In the context of the question, you need to determine the signs of potential changes for each element, using the four points discussed together with Figure 21.26. This involves identifying and examining each element separately. For example, if an element is gaining electrons in a chemical reaction, it will exhibit a negative change in potential, due to the increase in negatively charged particles.
On the other hand, if an element is losing electrons (being oxidized), it will show a positive change in potential as the positively charged particles increase. Be sure to apply this analyzation carefully and consistently to all elements in your examination to ensure accurate results.
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Which TWO properties are characteristic of iconic compounds?
brittleness
ductility
high melting point
low boiling point
malleability
Some characteristics of Ionic compounds by Mimiwhatsup: brittle, high melting point, conducts electricity when molten or dissolved in water.
Answer : The correct options are, brittleness and high melting point
Explanation :
Ionic compound : Ionic compounds are the compounds which are formed when a metal cation bonded with non-metal anion. The metal cation and non-metal anion bonded with an electrostatic force of attraction.
The properties of ionic compounds are :
Ionic compounds are brittle and hard. They breaks easily into small pieces.
They have high melting point and boiling point.
They conduct electricity in liquid state not in solid state.
Hence, the brittleness and high melting point properties are the characteristic of ionic compounds.
Rank the metals from most reactive (1) to least reactive (3) silver, strontium, and technetium
Answer:
1 = strontium
2 = technetium
3 = silver
Explanation:
Strontium is present in 2 group of periodic table. It is alkaline earth metal. It is most reactive element and can not found free in nature. it is insoluble in water but react with water and form strontium hydroxide and hydrogen gas is also produced. It is radioactive element.
It is similar to the calcium and can incorporated into bones. The food rich with strontium is used to avoid the osteoporosis. It is found in leafy vegetables, grains, sea foods etc.
In given series strontium is highest in reactivity then technetium, while the technetium is more reactive than silver. The silver is less reactive as compared to both given elements.
Answer:
1. Strontium 2. Technetium 3. Silver
Explanation:
PLEASE ANSWER
ARE THESE CORRECTTTTTT
1. The answer is E.
2. I agree with your answers.
3. I also agree with your answers
Left Frame
The answer you have chosen is not correct. You have selected a physical property. Color is something that will not change as long as nothing chemical is done to the sample. If it is just going to sit there at room temperature in a flask and be admired, (particularly if the flask has a cork in it), then whatever you see is a physical property. The only one that isn't is E. When you burn something, there is a change. One chemical turns into something else. If you burn gasoline (for your car) then C8H18 + 13.5 02 ==> 8CO2 + 9H20 is the result. That gasoline is not easily reversible. It has changed into something else (Water and Carbon Dioxide). That's Chemical.
Middle Frame
I've never encountered these terms before. Your two examples of extensive are correct. I'm not sure about the chemical reaction. I think it is intensive, but I wouldn't bet the farm on it. A chemical reaction is going to take place no matter how much is used. You could have too much sample or too much acid, but what happens does not depend on the amount. I think you are correct.
Answer: you have placed these in the right place.
Right frame.
All four are in the right category. Very nicely done.
25 Points
Question
How does the structure of a carbon atom enable it to form large molecules?
Available Choices
[A] Each carbon atom can be stable with one, two, three, or four bonds because of how its valence electrons are arranged.
[B] Each carbon atom can bond with several other carbon atoms because of how many valence electrons it has.
[C] Each carbon atom donates its electrons to other atoms, including atoms of noble gases and halogens.
[D] Each carbon atom forms either double or triple bonds with surrounding hydrogen atoms.
Try your best, this is important, 25 points and brainliest answer if you get it right!
The answer is (B).
Each Carbon atom can bond with several other carbon atoms because of how many valence electrons it has.
Carbon atom has four valence electrons, so each single carbon can form four bonds in total either with other carbons or some other atoms. So, a chain can be formed with carbon linked to another and then so on.
The bond between Carbon to another Carbon is strong and stable so the compounds tend to be stable enough to exist.
Answer:
B. Each carbon atom can bond with several other carbon atoms because of how many valence electrons it has.
Explanation:
Carbon atom has four valence electrons, so each single carbon can form four bonds in total either with other carbons or some other atoms. So, a chain can be formed with carbon linked to another and then so on.
The bond between Carbon to another Carbon is strong and stable so the compounds tend to be stable enough to exist.
what are two sources of heat in the earths interior
The flow of heat from Earth's interior to the surface is estimated at terawatts (TW) and comes from two main sources in roughly equal amounts:
radiogenic heat produced by the radioactive decay of isotopes in the mantle and crustprimordial heat left over from the formation of the Earth. The other main sources of heat in the deep earth are:Heat from when the planet formed and accreted, which has not yet been lost; Frictional heating, caused by denser core material sinking to the center of the planet Heat from the decay of radioactive elements.what was the atomic theory about?
The scientific theory of the matter of nature.
I need help with my assessment.
The question is...
Now, look at the segment of the graph between the two data points marked with black squares. Describe how the boiling point and melting point plots behave between these points. Be as specific as possible.
You didn't put an image. Sorry. Please put an image
When a substance changes from one phase to another, which of the following occurs? A. The substance loses or gains heat. B. The average kinetic energy of the substance changes. C. The temperature of the substance changes. D. The molecular motion of the substance changes.
Answer:
A. The Substance Loses or Gains Heat
Explanation:
Plato 5/5
PLSSS HELP
How do anion formation and valence electrons relate?
A) Atoms gain valence electrons to form anions.
B) Atoms yield valence electrons to form anions.
C) Atoms donate valence electrons to form anions.
D) Atoms relinquish valence electrons to form anions.
Vanadium has two naturally occuring isotopes - vanadium-50 and vanadium-51. Predict the isotopic mass of vanadium-50 given that vanadium-50 has an abundance of 0.250% and that vanadium-51 has an abundance of 99.750% and a mass of 50.944 amu.
A) 49.944 amu
B) 62.558 amu
C) 63.303 amu
D) 5094.151 amu
Scientists use the emission spectra of elements to detect
A) explosives in luggage.
B) cracks in support structures, like bridges.
C) the possibility of an earthquake occurrence.
D) elements in clouds of gas and dust in deep space
Stars, such as our sun, use fusion to combine hydrogen atoms into helium atoms, and in the process, create energy. As massive stars use the last of their helium fuel, they begin to collapse and temperatures climb high enough to fuse other heavier elements. As elements increase in atomic number, the amount of energy required for fusion to occur also increases. Nickel represents the heaviest element that can be produced by fusion due to to the net energy requirements. Two atoms of ___________ could combine by fusion in order to create nickel.
A) hydrogen
B) nitrogen
C) oxygen
D) silicon
Answer:
1. A) Atoms gain valence electrons to form anions.
2. D) 50.94151 amu
3. D) elements in clouds of gas and dust in deep space.
4. D) silicon
Explanation:
Hello,
1. In this question, we consider that anions are chemical ions negatively charged, it means that they gain valence electrons to increase their oxidation states, thus the answer is: A) Atoms gain valence electrons to form anions.
2. In order to compute the required average atomic mass, we must consider the mass of each isotope and its percentage as shown below:
[tex]M=50amu*0.0025+50.944amu*0.9975\\M=50.94151amu[/tex]
Therefore answer is D).
3. In this case, the answer is: D) elements in clouds of gas and dust in deep space, as each element has its own atomic emission spectrum, therefore one can identify the spectra in order to determine which elements are present.
4. Since helium is obtained via the atomic fusion of two hydrogen atoms, nickel can be obtained via the atomic fusion of two silicon atoms since each silicon has 14 protons and electrons, thus, if we fusion them we obtain 28 protons and electrons, validating the existence of a nickel atom.
Best regards.
The volume of a gas is 450ml when it’s pressure is 1.00ATM. If the temperature of the gas does not change what is the pressure when it’s volume is changed to 2.00 L?
Answer:
answer is 0.225 atm
Explanation:
was right on edge
Find the number of moles of water that can be formed if you have 178
mol of hydrogen gas and 84 mol of oxygen gas. Please give an explanation why. Thanks!
Answer:- 168 moles of water are formed.
Solution:- The balanced equation for the formation of water from hydrogen and oxygen gases is:
[tex]2H_2(g)+O_2(g)\rightarrow 2H_2O(l)[/tex]
From this equation hydrogen and oxygen react in 2:1 mol ratio.
We have been given with 178 moles of hydrogen and 84 moles of oxygen. We need to figure out the limiting reactant first. For this let's either calculate the moles of oxygen required to react completely with 178 moles of hydrogen or the moles of hydrogen required to react completely with 84 moles of oxygen.
Let's say we calculate the moles of oxygen required to react completely with 178 moles of hydrogen:
[tex]178molH_2(\frac{1molO_2}{2molH_2})[/tex]
= [tex]89molO_2[/tex]
From the above calculations, 89 moles of oxygen are required to react completely with 178 moles of hydrogen but only 84 moles of oxygen are available, It means oxygen is the limiting reactant and the product yield depends on it.
There is 1:2 mol ratio between oxygen and water. Let's calculate the moles of water for given 84 moles of oxygen:
[tex]84molO_2(\frac{2molH_2O}{1molO_2})[/tex]
= [tex]168molH_2O[/tex]
So, the reaction of 178 moles of hydrogen and 84 moles of oxygen gives 168 moles of water.
Final answer:
To determine the number of moles of water that can be formed from 178 mol of hydrogen gas and 84 mol of oxygen gas, the balanced chemical equation 2 H₂ + O₂ → 2 H₂O is used. Oxygen is the limiting reactant with only 84 mol available, resulting in the production of 168 moles of water.
Explanation:
To find the number of moles of water that can be formed from 178 mol of hydrogen gas (H₂) and 84 mol of oxygen gas (O₂), we need to use the balanced chemical equation for the formation of water:
2 H₂(g) + O₂(g) → 2 H₂O(g)
According to this equation, 2 moles of H₂ react with 1 mole of O₂ to produce 2 moles of H₂O. The limiting reactant is the one that will run out first and determine the amount of the product formed. With 178 mol of hydrogen available, we would need 89 mol of oxygen to fully react with all the hydrogen (since the ratio is 2:1). However, since we only have 84 mol of oxygen, oxygen is the limiting reactant.
We can calculate the moles of water produced as follows:
84 mol O₂ (2 mol H₂O / 1 mol O₂) = 168 mol H₂O
Therefore, 168 moles of water can be formed from 178 mol of hydrogen gas and 84 mol of oxygen gas.
Is spoiling food a physical or chemical change
Spoiling food is a chemical change.
Spoiling food is a chemical change and the composition of the substance does changes to form new substances.
How do we explain?In a physical change, the composition of the substance does not change. For example, if you cut an apple in half, the apple will change shape, but the molecules that make up the apple will still be the same.
In a chemical change, the composition of the substance does change. For example, when food spoils, the food molecules react with each other to form new substances with different properties. These new substances may have a differe6t color, smell, or taste than the original food. They may also be harmful to eat.
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What is the pH of 0.10 M NH4Cl(aq). The Kb of NH3 is 1.8 x 10-5
8.87
11.13
5.13
2.87
Hey there!:
ka = kw/ kb
Ka = 1.0*10⁻¹⁴ / 1.8* 10⁻⁵
Ka = 5.56*10⁻¹⁰
Now Cl⁻ is spectator ion
NH⁴⁺ ---> NH3 + H⁺
Kb = [NH⁴⁺ / [NH3] [H⁺]
at equilibrium the concentration of products is taken as x each and that of ammonium ion will be ( 0.10 -x )
5.56*10⁻¹⁰ = x² / [0.10 -x]
x = 7.54* 10⁻⁶ M
pH = - log [ H⁺ ]
pH = - log [ 7.54*10⁻⁶ ]
pH = 5.13
Answer C
Hope that helps!
The pH of a 0.10 M solution of NH4Cl is calculated using the Kb value of NH3 and the relationship between Ka, Kb, and Kw. By using the hydrolysis reaction equation and finding [H3O+], we can apply the formula pH = -log[H3O+] to get the pH value of 5.13.
Explanation:The pH of a 0.10 M NH4Cl solution can be determined using the Kb value of NH3 and the relationship between Ka, Kb, and Kw (ion product for water). Ammonium chloride, NH4Cl, will associate in water to form NH4+ and Cl-. The NH4+ ion reacts with water in a hydrolysis reaction: NH4+ + H2O ⇌ NH3 + H3O+. This reaction has a Ka (acid dissociation constant) that can be calculated from the Kb (base dissociation constant) of NH3, using the relationship Kw=Ka x Kb (Kw is the ion product for water, 1.0 x 10-14 at 25°C). Therefore, Ka = Kw/Kb = 1.0 x 10-14 / 1.8 x 10-5 = 5.56 x 10-10.
This is a weak acid equilibrium, use ICE table and solve for [H3O+] using the equation Ka = [NH3][H3O+] / [NH4+]. After calculating the [H3O+], we can find the pH using the formula pH = -log[H3O+]. The correct pH value will be close to values between 4 and 6, thus the answer is 5.13.
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Bella is writing a research paper on ocean currents. Which two sources should she consult?
Within __________ minutes after a drink is consumed, all of the alcoholic content has probably been absorbed into the body. 60-90 10 to 20 90-100 20-60
Within 60–90 minutes after a drink is consumed, all the alcoholic content has probably been absorbed into the body. This means that during this time frame, the majority of the alcohol present in the drink has entered the bloodstream and is distributed throughout the body.
When an alcoholic drink is consumed, the alcohol content is absorbed into the body primarily through the gastrointestinal tract. After ingestion, the alcohol passes through the stomach and enters the small intestine, where most of the absorption takes place.
The absorption process is relatively rapid, with the majority of the alcohol being absorbed within 60–90 minutes after consumption. However, the exact timing can vary depending on several factors, including the individual's metabolism, the type and strength of the drink, the presence of food in the stomach, and other individual characteristics.
During this absorption period, the alcohol molecules are transported across the lining of the small intestine and enter the bloodstream. From there, the alcohol is distributed throughout the body, including the brain, where it exerts its effects.
After the absorption process is complete, the body begins to metabolize and eliminate the alcohol. The liver plays a crucial role in metabolizing alcohol, breaking it down into less harmful byproducts that can be excreted from the body.
It's important to note that the effects of alcohol can vary and may continue to be felt even after the absorption process is complete. Factors such as the amount consumed, individual tolerance, and the rate of alcohol metabolism can influence the duration of alcohol's effects on the body.
Hence, the timeframe of 60–90 minutes represents a general estimate for the absorption of alcohol into the body, but individual variations can occur.
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Final answer:
After consuming a drink, all of the alcoholic content is typically absorbed into the body within 20-60 minutes. This process is influenced by various factors, including the presence of food and the drink's alcohol concentration.
Explanation:
The question addresses how quickly all of the alcoholic content of a drink is absorbed into the body after consumption. The absorption rate of alcohol into the body is significant because it affects how quickly a person feels the effects of alcohol and how soon the body can begin to metabolize and eliminate it. The correct answer to the question is 20-60 minutes after a drink is consumed, all of the alcoholic content has probably been absorbed into the body. This timeframe allows for the passage of alcohol through the stomach and into the bloodstream, with variations depending on factors like the presence of food in the stomach, the alcohol concentration of the drink, and individual metabolic rates.
What concentration of clo3– results when 925 ml of 0.393 m agclo3 is mixed with 685 ml of 0.283 m mn(clo3)2?
Answer;
= 0.7698 M
Explanation and solution;
AgClO3 ionizes as follows:
AgClO3 ---> Ag^+ + ClO3^-
Moles AgClO3 dissolved ---> (0.393 mol/L) (0.925 L) = 0.424865 mol
From the chemical equation, one mole of AgClO3 dissolving yields one mole of ClO3^- in solution.
Moles ClO3^- = 0.424 865 mol
Similarly;
Mn(ClO3)2 dissolves as follows:
Mn(ClO3)2 ---> Mn^2+ + 2ClO3^-
Moles Mn(ClO3)2 dissolved ---> (0.283 mol/L) (0.685 L) = 0.413139 mol
From the chemical equation, one mole of Mn(ClO3)2 dissolving yields two moles of ClO3^- in solution.
Moles ClO3^- = 0.413139 mol x 2 = 0.826277 mol
Total moles ClO3^- in solution;
0.826277 mol + 0.413139 mol = 1.239416 mol
Total volume of solution ---> 0.925 L + 0.685 L = 1.61 L
Molarity of ClO3^- ---> 1.239416 mol / 1.61 L = 0.7698 M
Answer: The concentration of chlorate ion is 0.467 M
Explanation:
To calculate the number of moles for given molarity, we use the equation:
[tex]\text{Molarity of the solution}=\frac{\text{Moles of solute}}{\text{Volume of solution (in L)}}[/tex] .....(1)
For [tex]AgClO_3[/tex]:Molarity of [tex]AgClO_3[/tex] solution = 0.393 M
Volume of solution = 925 mL = 0.925 L (Conversion factor: 1 L = 1000 mL)
Putting values in equation 1, we get:
[tex]0.393M=\frac{\text{Moles of }AgClO_3}{0.925L}\\\\\text{Moles of }AgClO_3=(0.393mol/L\times 0.925L)=0.364mol[/tex]
For [tex]Mg(ClO_3)_2[/tex]:Molarity of [tex]Mg(ClO_3)_2[/tex] solution = 0.283 M
Volume of solution = 685 mL = 0.685 L
Putting values in equation 1, we get:
[tex]0.283M=\frac{\text{Moles of }Mg(ClO_3)_2}{0.685L}\\\\\text{Moles of }Mg(ClO_3)_2=(0.283mol/L\times 0.685L)=0.194mol[/tex]
The chemical equation for ionization of silver chlorate follows:
1 mole of silver chlorate produces 1 mole of silver ion and 1 mole of chlorate ion
Moles of chlorate ion = 0.364 moles
The chemical equation for ionization of magnesium chlorate follows:
[tex]Mg(ClO_3)_2\rightarrow Mg^{2+}+2ClO_3^-[/tex]
1 mole of magnesium chlorate produces 1 mole of magnesium ion and 2 moles of chlorate ion
Moles of chlorate ion = (2 × 0.194) = 0.388 moles
Now, calculating the molarity of chlorate ion by using equation 1, we get:Moles of chlorate ion = (0.364 + 0.388) = 0.752 moles
Volume of solution = (925 + 685) = 1610 mL = 1.610 L
Putting values in equation 1, we get:
[tex]AgClO_3\rightarrow Ag^++ClO_3^-[/tex]0.752[tex]\text{Molarity of chlorate ion}=\frac{0.752mol}{1.610L}\\\\\text{Molarity of chlorate ion}=0.467M[/tex]
Hence, the concentration of chlorate ion is 0.467 M
Balance the combustion reaction between butane and oxygen. 2C4H10 + O2 → CO2 + H2O
2C4H10 + 8O2 → 8CO2 + 10H2O
Description:There should be 8 molecules of oxygen which react with 2 molecules of butane to produce 8 molecules of carbon dioxide and 10 molecules of water.
Answer:
Explanation:
Answer:
2C4H10 + 13O2 → 8CO2 + 10H2O
Explanation:
2C4H10 + O2 → CO2 + H2O
There are 8 carbon atoms on the left side of the equation thus , there should be equal number of carbon atoms on the right side
So, if we balance carbon atoms only, the new eqation becomes
2C4H10 + O2 → 8CO2 + H2O
Now carbon atoms are balance but there are 20 , hydrogen atoms on the left side but 2 atoms only on the right side. So the new equation after balancing hydrogen atom becomes
2C4H10 + O2 → 8CO2 + 10H2O
Now both carbon and hydrogen atoms are balanced but oxygen atoms are pending. There are 26 atoms of (O) on the right side , while 1 molecule of (O2)
So the balanced equation would be
2C4H10 + 13O2 → 8CO2 + 10H2O
Which of the following is true of the figures below?
A. Figure I is a heterogenous mixture, because the particles can be separated and the are not uniformly distributed. Figure II is a homogenous mixture, because the particles can be separated and are uniformly distributed.
B. Figure I is a pure substance, because it cannot be chemically separated. Figure II is a heterogenous mixture because the particles are not uniformly distributed.
C. Figure I is a homogenous mixture, because the particles can be separated and are uniformly distributed. Figure II is a heterogenous mixture, because the particles can be separated and the are not uniformly distributed.
D. Figure I and Figure II are both pure substances, because they cannot be chemically separated.
The option C is the correct answer.
Which is fig. I is homogeneous mixture while fig. II is heterogeneous mixture.
Explanation:Homogeneous mixture: A mixture of two or more substance which has same composition through out the mixture.Heterogeneous mixture: A mixture of two or more substance which does not have the same composition through out the mixture.Hence according to above definitions, option C is correct one.Solutions can be composed of:
a. solids and liquids
b. two solids
c. two liquids
d. Any of the above
A solution may exist in any phase so your answer is D. any of the above
hope this helps :)
Final answer:
A solution can be made up of any combination of solids, liquids, and gases, including solid and liquid, two solids, or two liquids. Hence, the correct answer is (d) Any of the above.
Explanation:
Solutions can be composed of various states of matter. A solution is defined as a homogeneous mixture where the particles of one or more substances (the solute) are distributed uniformly throughout another substance (the solvent).
Solid and liquids: A solution can consist of solid solute particles dissolved in a liquid solvent, which includes many common solutions like salt in water.Two solids: Solid solutions, also known as alloys in the case of metals, consist of two solids where the atoms of the solute are dispersed among the solvent atoms, like brass which is an alloy of copper and zinc.Two liquids: This refers to when two liquids are combined to form a homogeneous mixture, such as alcohol in water.Gas-phase solutions (e.g., aerosols) can also exist but for this discussion, we are focusing on liquid-phase and solid-phase solutions.Considering these examples, the correct answer to the student's question is d. Any of the above.
For each domain, list one example of an organism that is found there.
Which of the following is the science of naming living things according to common characteristics? A) taxonomy Eliminate B) classification C) phylogeny D) taxon
Answer: A) Taxonomy
Taxonomy is the science of naming groups of living organism based on common characteristics
The answer is A.
Taxonomy is the science of naming living things according to common characteristics.It is also the science of grouping organisms according to their characteristics and evolutionary history.
A square block made of a very strong metal has a mass of 0.56375 kilograms. The length of each side block is 5 .0 cm. A) caculate the volume of the block in cm3. B) calculate the density of the block ing /ml.
A) The volume of the block is 125 cm³.
[tex]V = l^{3} = (\text{5.0 cm})^{3} = 125 \text{ cm}^{3}\\[/tex]
B) The density of the block is 4.5 g/cm³.
[tex]\text{Density} = \frac{\text{Mass}}{\text{Volume}} = \frac{\text{563.75 g}}{125 \text{ cm}^{3}} = \text{4.5 g/cm}^{3}\\[/tex]
1) 239Pu has a half-life of 24000 years.
If we have 10 g of 239Pu, how many grams will be left after 75000 years?
Answer in units of g.
2) The half-life of 137Ce is 30 years.
How many grams of 137Ce must be produced now to have a sample containing 37 g of 137Ce 160 years from now?
Answer in units of g.
1)
[tex]1.2 \; \text{g}[/tex]
There are [tex]75000/24000 = 25/8 = 3.125[/tex] half lives in a period of 75,000 years. The sample of plutonium-239 would thus expect a loss in mass that would results in a mass ratio of [tex](1/2)^{25/8}[/tex] which is the same as [tex]2^{-25/8} \approx 0.12 [/tex] relative to the initial mass. [tex]0.12 \times 10 \; \text{g} = 1.2 \; \text{g}[/tex] of plutonium-239 would thus remain in the initial [tex]10 \; \text{g}[/tex] sample after 75,000 years.
2)
[tex]1.5 \times 10^{3} \; \text{g}[/tex]
There are [tex]160/30 = 16/3 \approx 5.3[/tex] half lives in 160 years.
[tex]\text{mass remaining in 160 years} / \text{initial mass} = (1/2)^{160/30} \approx 2.5 \times 10^{-2}[/tex]
Thus
[tex]\text{initial mass} = 37 \; \text{g} / (2.5 \times 10^{-2})= {\text{initial mass} } \approx 1.5 \times 10^{3} \; \text{g}[/tex]
The ph of a 0.175 m aqueous solution of a weak acid is 3.52. what is ka for this acid?
Hey there!
pH = - log [ H⁺ ] = 3.52
[ H⁺ ] = 10^-pH
[ H⁺] = 10^ ( -3.52 )
[H⁺] = 3.02*10⁻⁴ M
[HA] =0.175 M
Therefore:
Ka = [ H⁺]* [A⁻] / [ HA]
Ka = (3.02*10⁻⁴)² / 0.175
Ka = 9.1204*10⁻⁸ / 0.175
Ka = 5.2*10⁻⁷
Hope that helps!
By utilizing the given pH and molarity of the weak acid solution, we calculate the concentration of ionized and non-ionized acid. Then, we apply the equilibrium constant formula to calculate a Ka value of 5.22 x 10^-9.
Explanation:The pH of the weak acid is given as 3.52. This equates to the concentration of [H+], which we can find using the formula [H+] = 10^(-pH). This gives us [H+] = 10^(-3.52) = 3.02 x 10^-4.
In a weak acid, [H+] = [A-] (the concentration of the deprotonated, or ionized, acid). Since we know the total concentration of the weak acid is 0.175 M, we can find the concentration of the un-deprotonated, or non-ionized, acid, [HA], by subtracting [H+] from this. So [HA] = 0.175 - 3.02 x 10^-4 = 0.1747 M.
Finally, knowing [H+], [A-], and [HA], we can calculate Ka, the equilibrium constant of the acid dissociation reaction, through the equation Ka = [H+][A-]/[HA]. Plugging in our numbers gives Ka = (3.02 x 10^-4)^2 / 0.1747 = 5.22 x 10^-9.
Learn more about Ka calculation here:https://brainly.com/question/27548374
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