Answer:
[tex]\% \frac{A}{A_0}=75.9\%[/tex]
Explanation:
Hello!
In this case, since the kinetics of the radioactive decay is assumed to be first-order, it is possible to use the following equation to quantify that change:
[tex]\frac{A}{A_0} =2^{-\frac{t}{t_{1/2}}[/tex]
Thus, given the elapsed time, 635 years, and the half-life, 1599 years, we can compute the fraction of the present amount:
[tex]\frac{A}{A_0} =2^{-\frac{365years}{1599years}\\\\\frac{A}{A_0} =0.759[/tex]
Thus, the percent is:
[tex]\% \frac{A}{A_0}=0.759*100\%\\\\ \% \frac{A}{A_0}=75.9\%[/tex]
Best regards!
Acetic acid and water react to form hydronium cation and acetate anion, like this:
HCH3CO2(aq)+H2O-------->H3O(aq)+CH3CO2-(aq)
Imagine 226.mmol of CH3CO2- are removed from a flask containing a mixture of HCH3CO2,H2O ,H3O and CH3CO2- at equilibrium, and then answer the following questions.
1. What is the rate of the forward reaction before any HCH3CO2 has been removed from the flask?
a. zero.
b. greater than zero, but less than the rate of the reverse reaction.
c. greater than zero, and equal to the rate of the reverse reaction.
d. greater than zero, and greater than the rate of the reverse reaction.
2. What is the rate of the forward reaction just after the HCH3CO2 has been removed from the flask?
a. zero.
b. greater than zero, but less than the rate of the reverse reaction.
c. greater than zero, and equal to the rate of the reverse reaction.
d. greater than zero, and greater than the rate of the reverse reaction.
3. What is the rate of the forward reaction when the system has again reached equilibrium?
a. zero.
b. greater than zero, but less than the rate of the reverse reaction.
c. greater than zero, and equal to the rate of the reverse reaction.
d. greater than zero, and greater than the rate of the reverse reaction.
4. How much less hch3co2 is in the flask when the system has again reached equilibrium?
a. none.
b. some, but less than 217mmol.
Answer:
1. c. greater than zero, and equal to the rate of the reverse reaction.
2. d. greater than zero, and greater than the rate of the reverse reaction.
3. c. greater than zero, and equal to the rate of the reverse reaction.
4. b. some, but less than 217 mmol.
Explanation:
Dynamic equilibrium is only attainable in a closed system. When dynamic equilibrium has been attained in a closed system, the rate of forward reaction becomes exactly the same as the rate of reverse reaction.
If the equilibrium of the system is disturbed by removal of one of the products, the equilibrium position will shift to the right thereby yielding more reactants.
After some time, equilibrium is reestablished and rate of forward reaction is once again equal to the rate of reverse reaction.
As the reaction proceeds, the reactants are used up and their concentration at equilibrium is usually less than the initial concentration at the commencement of the reaction.
Why are lubricants necessary?
decrease loss of energy
reduce friction
used as fuel
increase heat energy
Answer:
reduce friction
Explanation:
Lubricants are needed to reduce the friction between two bodies in contact with one another.
Frictional force is a force that opposes the motion of a body. As a body moves forward, friction acts in an opposite direction.
Lubricants are used to reduce and remove frictionUnfortunately, without friction, motion cannot be controlled.Lubricants only reduces friction between two bodies. As friction reduces, a body moves more readily and easily.Which of these is a typical property of a substance that is composed of atoms that are held together by covalent bonds?
Answer) It does not conduct electricity in any form. Consider the location of barium, chlorine, iodine, and strontium on the periodic table. It conducts electricity when it is dissolved in water.
I hope it is helpful
2. How many grams of Mercury are in 9 moles of Mercury?
Answer:
hope you like my answer
Explanation:
this is the answer
What is the answer to this?
one if them is phosphate
Four different insect mouthparts are shown.
Which is best adapted for chewing leaves?
Insect Mouthparts
OW
OX
ΟΥ
OZ
W X Y Z
Answer:
the correct answer is W on edge 2020
Explanation:
I took the test
The mouth part of an insect which is best adapted for chewing leaves is the one labelled as'W'as it shows presence of sharp teeth which help i tearing.
What is an insect?Insects are pancrustacean hexapod invertebrates of the class Insecta. They are the largest group within the arthropod phylum. Insects have a chitinous exoskeleton, a three-part body (head, thorax and abdomen), three pairs of jointed legs, compound eyes and one pair of antennae. Their blood is not totally contained in vessels; some circulates in an open cavity known as the haemocoel. Insects are the most diverse group of animals; they include more than a million described species and represent more than half of all known living organisms.
The total number of extant species is estimated at between six and ten million; potentially over 90% of the animal life forms on Earth are insects. Insects may be found in nearly all environments, although only a small number of species reside in the oceans, which are dominated by another arthropod group, crustaceans, which recent research has indicated insects are nested within.
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Which compounds have the empirical formula CH20?
a. C2H402
b. C3H603
c. CH202
d. C5H1005
e C6H1206
Answer:
Answer is A.
Explanation:
I hope it's helpful!
Where would you find an angular unconformity?
Answer:
What are Types of Unconformity?
Disconformity. A disconformity is an unconformity between parallel layers of sedimentary rocks which is a period of erosion or non-deposition.
Nonconformity. A nonconformity exists between sedimentary rocks and metamorphic or igneous rocks when the sedimentary rock lies above and was deposited on the pre-existing and eroded metamorphic or igneous rock.
Angular unconformity. An angular unconformity is an unconformity in which horizontally parallel strata of sedimentary rock are deposited on tilted and eroded layers, resulting in angular discordance with the horizontal …
Explanation:
Answer:
For geologists, one of the most famous angular unconformity is the Grand Unconformity in the Grand Canyon of Arizona. Here tilted sedimentary rocks of Precambrian age are overlain by younger sedimentary rocks of Phanerozoic age.
Explanation:
An isotype has the same number of _____ but a different number of ______ than other atoms of the same element
electrons, protons, neutrons are the answer choices for both
Answer:
BTS
Explanation:
What is The Magnus Effect/Force? Explain.
Answer:
dk
Explanation:
PLEASE ANSWER ASAP!!! I WILL GIVE FREE PIONTS AND BRAINLIEST IF YOU ARE CORRECT! PLEASE ANSWER ITS DUE TODAY!!!
Answer:
Explanation:
This image is a good example of the law of conservation of mass because it shows that mass is not created or destroyed. We can see this in the picture because there's 4 hydrgen and 2 oxygen atoms in the reactants (the left side of the arrow) and there's 2 oxygen atoms and 4 hydrogen atoms in the products (right side of the arrow). Since there's the same amount of atoms on both sides, then law of conservation of mass applies.
Stealing your points like how you stole mine! +*♡
Don't answer someone's question with some nonsense and then delete it; especially when I spent over an hour on that one question. I will surely delete my answers after this and still have my 15 points...
don't reap what you sow :)
You can search that up if you don't even know what that means.
Have a nice day! +*♡
Hope this helped.
Balance the equation Fe2O3 + H2SO4 → Fe2(SO4)3 + H2O.
What is the mole ratio of H2SO4 and H2O in the equation?
1:3
3:2
2:1
3:3
The mole ratio of H2SO4 and H2O in the equation = 3:3
Further explanationGiven
Reaction
Fe2O3 + H2SO4 → Fe2(SO4)3 + H2O
Required
Balanced equation
Solution
Fe₂O₃ + H₂SO₄ → Fe₂(SO₄)₃ + H₂O
Give a coefficientaFe₂O₃ + bH₂SO₄ → Fe₂(SO₄)₃ + cH₂O
Make an equationFe, left = 2a, right=2⇒2a=2⇒a=1
S, left=b, right=3⇒b=3
H, left = 2b, right = 2c⇒2b=2c⇒2.3=2c⇒c=3
The equation becomes :
Fe₂O₃ + 3H₂SO₄ → Fe₂(SO₄)₃ + 3H₂O
Explain two ways that photosynthesis helps a predator like a wolf or
tiger.
Answer: Photosynthetic organisms take light energy and use it to make their own "food". In this process they use carbon dioxide and light to make sugars and oxygen. This is great for other animals that utilize this oxygen and eat the plants for food.
HOPE THIS HELPS
Photosynthesis is the source of energy in the ecosystem. Without this energy source, there will be no food available to predators such as wolf or
tiger.
In the ecosystem, energy is transferred along the food chain. The food chain shows the feeding relationships among living organisms in the ecosystem.
The green plants are the primary producers. They are able to trap energy directly from the sun and make their own food through the process of photosynthesis.
It is this energy from the food that they make through photosynthesis that is passed along the food chain as herbivores eat green plants and are in turn eaten by the predators.
Also, green plants produce oxygen during photosynthesis which is taken in by animals such as wolf or tiger and is used in the breakdown of complex food materials.
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If all the forces of an object cancel, the object will ___.
Answer:
stop moving
Explanation:
Answer: keep the same inertia
Imagine two people in a tug-of-war. If both sides are balanced, then this means that the flag in the middle won't move. This idea applies to any object in which multiple forces are applied to it. If the forces cancel out, then the object will stay at rest if it's already at rest. If the object is in motion, then it will stay in motion. This is Newton's First Law of Motion. It describes inertia of an object, which is the tendency of it to speed up or slow down (more or less).
A chiral C5H10O ether reacts with excess hot HI to give a C5H10I2 product. When this product is treated with KOH, 1,3-pentadiene is produced. What is the structure of the starting ether
Answer:
See answer and picture below
Explanation:
In this case, the key to get an idea of how is the starting ether is with the final product and the empirical formula of the ether.
First, the empirical formula of the ether gives us information of the structure of the ether. This ether could be either an alkene, alkane or cycloalkane.
Alkane cannot be because alkane's formula is CnH(2n+2), so it's either an alkene or cycloalcane (CnH2n).
However, as we can see, it reacts with HI in excess, so, it cannot be an alkene because in this case the acid will react with the double bond of the ether too forming another product. This discart the fact that the ether has a double bond. So it has to be a cycloalkane.
As the innitial structure it's an ether, it should be either a cyclohexane or cyclopentane with a methyl group attached. So, how can we know which of these structures is? well, we can actually do the reaction with both reactants and see which match. In the attached picture you have the answer.
Hope this helps.
The starting ( original ) structure of ether after the entire reaction above is given in the picture attached to this answer sheet
EtherEthers are also one of the classes of organic compounds that contain an ether group ( an oxygen atom connected to two alkyl or aryl group )
They have the general formula R–O–R′, where R and R′ represent the alkyl or aryl groups.
Ethers; however can as well be classified into two categories:
If the alkyl groups are the same on both sides of the oxygen atom, then it is a simple or symmetrical etherIf they are different, the ethers are called mixed or unsymmetrical ethersLearn more about organic compounds:
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Calculate the molar mass of adrenaline (C9H13NO3C9H13NO3), a hormone responsible for regulating heart rate and other functions of the sympathetic nervous system. Express your answer to five significant figures.
Answer:
[tex]M_{C_9H_{13}NO_3}=183.23g/mol[/tex]
Explanation:
Hello!
In this case, since the molar mass of a chemical compound is computed by averaging the atomic mass of each element in the molecule and the amount of atoms; which in this case there are 9 carbon atoms, 13 hydrogen atoms, 1 nitrogen atom and 3 oxygen atoms; thus, we compute the average as shown below:
[tex]M_{C_9H_{13}NO_3}=m_C*9+m_H*13+m_N+m_O*3[/tex]
Now, we plug in the atomic masses to obtain:
[tex]M_{C_9H_{13}NO_3}=12.01*9+1.01*13+14.01+16.00*3\\\\M_{C_9H_{13}NO_3}=183.23g/mol[/tex]
Best regards!
Question: Write a short paragraph on how you separate mixtures at home?
Answer:
We can separate mixtures at home by following ways;
Mixtures can be separated using a variety of techniques.
Chromatography involves solvent separation on a solid medium.
Distillation takes advantage of differences in boiling points.
Evaporation removes a liquid from a solution to leave a solid material.
Filtration separates solids of different sizes.
Write the balanced equation for the formation of the Grignard reagent from bromobenzene.
Answer:
hello your question is incomplete attached below is the complete question
Write the balanced equation for the formation of the Grignard reagent from bromobenzene. Include all reagents and products BUT NOT SOLVENTS.
answer : attached below
Explanation:
I mol mg + 1 mol bromobenzene = 1 mol Grignard
attached below is the balanced equation for the formation of the Grignard reagent from bromobenzene
Predict the products of the reaction below. That is, complete the right-hand side of the chemical equation. Be sure your equation is balanced and contains state symbols after every reactant and product.
HNO3+ H2O → ______
Answer:
HNO₃ (aq) —> H⁺ (aq) + NO₃¯ (aq)
Explanation:
From the question given above
HNO₃ + H₂O —> ?
Nitric acid, HNO₃ reacts with water, H₂O to form aqueous solution of nitric acid as illustrated below:
HNO₃ + H₂O —> HNO₃ (aq)
Nitric acid is a strong acid and, so will ionised completely when dissolved in water. This is illustrated below:
HNO₃ (aq) —> H⁺ (aq) + NO₃¯ (aq)
Can anyone help me ASAP
Answer: Balance, multiply, find ratio
Explanation:
Balance the equation to be able to multiply correctly and accurately, multiply, and this will give you the molar ratio
Why is an ice cube less dense than liquid water?
O A. Molecules in ice have less space between them than molecules in liquid water
O B. Molecules in ice are more spread out than molecules in liquid water.
O C. Ice molecules have less mass than water molecules.
O D. Ice molecules have more mass than water molecules.
Anwser is B. Just got correct.
Answer:
B hope this helps
Explanation:
The density of a substance describes how closely its molecules are packed. Despite the fact that ice is a solid form, an ice cube contains many pores in and the molecules are more spread in the state than that in liquid state of water.
What is density?Density of a substance is the measure of its mass per unit volume. It describes how closely packed its molecules within a given volume. If the molecules have enough space to spread they will be less dense.
The objects which are less dense than water will float in it. Whereas which are having more density will sink on it. Ice floats on water because, ice is less dense than water.
An ice cube has a pore structure and one ice cube contains fewer water molecules and which are spread through the porous structure. Therefore, water in liquid state is more dense than ice.
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Which lists two inorganic substances?
gasoline and salt
salt and copper
copper and sugar
sugar and fat
Answer: Sugar and fat
Explanation:
Nitrogen can exist as a solid, a liquid, or a gas. Which of the following lists the
phases of nitrogen in order of increasing density?
1. liquid, gas, solid
2. gas, liquid, solid
3. gas, solid, liquid
4. solid, liquid, gas
The phases of nitrogen in order of increasing density is solid, liquid, and gas.
Nitrogen is known to be odorless and colorless. Nitrogen makes up about 78% of the gases that we've in the atmosphere. It has an atomic number of 7 and is represented with the symbol N.It should be noted that nitrogen can be a solid, a liquid or a gas. When nitrogen is at ordinary pressure, it is known to be a gas. In a case whereby nitrogen is below 77°K, then it's a liquid and it's a solid when it's below 63°K.The density explains the mass per unit volume that nitrogen has when it's either at gaseous, solid or liquid state. It should be noted that the highest density is at its gaseous state.Therefore, the phases of nitrogen in order of increasing density will then be solid, liquid, and gas.In conclusion, the correct option is D.
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how do i solve this?
Answer:
here you go
Explanation:
how does an objects mass affect its kinetic energy?
. What is absolute zero? What is the temperature of absolute zero on the Kelvin and Celsius scales?
Answer: Absolute zero is denoted as 0 K on the Kelvin scale, −273.15 °C on the Celsius scale, and −459.67 °F on the Fahrenheit scale.
Explanation: the lowest temperature that is theoretically possible, at which the motion of particles that constitutes heat would be minimal. It is zero on the Kelvin scale, equivalent to –273.15°C or –459.67°F.
Answer:
Absolute Zero is the absence of heat energy, aka the lowest possible temperature. In Kelvin absolute zero is just 0 because the Kelvin scale starts at 0. In celsius it is -273.15 degrees
Which gas is most abundant in Earth’s atmosphere?
Answer:
nitrogen
Explanation:
The atmosphere contains many gases, most in small amounts, including some pollutants and greenhouse gases. The most abundant gas in the atmosphere is nitrogen, with oxygen second. Argon, an inert gas, is the third most abundant gas in the atmosphere. Why do I care?
nitrogen is the most abundant gas in the atmosphere
When 3-iodo-3-ethylpentane is heated in methanol, the major organic product is an __________________ that is generated through a(n) __________________ mechanism.
Answer:
Ether
SN1 mechanism
Explanation:
The nucleophile in this reaction is CH3OH. It is a poor nucleopile. We already know that a poor nucleophile reacting with a tertiary alkyl halide often leads to the substitution product as the major product.
Also, the iodide ion is a good leaving group. This makes the SN1 substitution more likely yielding the ether as the major product as shown in the image attached.
Identify a reason that chemical reaction releases enegry during the reaction process
Answer:
The movement of molecules
Answer:
All chemical reactions involve energy. Energy is used to break bonds in reactants, and energy is released when new bonds form in products. Like the combustion reaction in a furnace, some chemical reactions require less energy to break bonds in reactants than is released when bonds form in products
Explanation:
To determine the mass in grams of any element, you would
a-divide the mass of a mole of the element by molar mass
b-subtract the mass of a mole of the element from Avogadro’s number
c-add the mass of a mole of the element to Avogadro’s number
d-multiply the mass of a mole by its molar mass
Answer:
d-multiply the mass of a mole by its molar mass
Explanation:
Mass of an element, Z, which is measured in grams is related to the number of moles contained in that element and its molar mass, which can be expressed using the formula:
number of moles (n) = mass ÷ molar mass
This means that the mass (in grams) can be calculated by multiplying the number of moles in the element by its molar/atomic mass. That is;
Mass (g) = number of moles (n) × molar mass (MM)
