Today scientists know that organisms are much less diverse than Darwin imagined.
True or false?
Answers
Answer:
FALSE
Explanation:
they were much more diverse
Related Questions
Write the balanced chemical equation for the following reaction and identify the
type of reaction.
Barium chloride reacts with aluminium sulphate to give aluminium chloride and
barium sulphate.
Answers
Answer:
3 BaCl₂ + Al₂(SO₄)₃ ⇒ 2 AlCl₃ + 3 BaSO₄
A double displacement reaction
Explanation:
Let's consider the reaction between barium chloride and aluminum sulphate to give aluminum chloride and barium sulphate. This is a double displacement reaction. The unbalanced equation is:
BaCl₂ + Al₂(SO₄)₃ ⇒ AlCl₃ + BaSO₄
We will start balancing Al atoms by multiplying AlCl₃ by 2.
BaCl₂ + Al₂(SO₄)₃ ⇒ 2 AlCl₃ + BaSO₄
Next, we will balance Cl atoms by multiplying BaCl₂ by 3.
3 BaCl₂ + Al₂(SO₄)₃ ⇒ 2 AlCl₃ + BaSO₄
Finally, we get the balanced equation by multiplying BaSO₄ by 3.
3 BaCl₂ + Al₂(SO₄)₃ ⇒ 2 AlCl₃ + 3 BaSO₄
What is the answer for N2O
Answers
Answer:
Nitrous Oxide = N20
Explanation:
For each of the following pairs of compounds, choose which will elute faster in a TLC experiment (i. E. , which compound will have a larger Rf value). Explain what factors led to your choice. 6 pt a. Naphthalene or 1-Bromonaphthalene Choice Explanation: 1-Bromonaphthalene is more polar than Naphthalene. If polarity is higher, its Rf value will be less which means that molecule will travel less distance (lower Rf value) during a TLC experiment
Answers
In a TLC experiment, the compound with the larger Rf value will elute faster. In the case of naphthalene and 1-bromonaphthalene, the 1-bromonaphthalene will elute faster and have a larger Rf value.
This is because 1-bromonaphthalene is more polar than naphthalene. Polar compounds have a stronger attraction to the polar stationary phase (such as the silica gel in TLC plates) and will interact more with it, resulting in a lower Rf value.
Naphthalene, on the other hand, is less polar and will have a weaker interaction with the stationary phase, allowing it to travel further and have a higher Rf value.
The polarity of a compound is determined by the presence of functional groups or atoms that create an uneven distribution of charge or electronegativity. In this case, the bromine atom in 1-bromonaphthalene increases its polarity compared to naphthalene, leading to a stronger interaction with the stationary phase.
In summary, the 1-bromonaphthalene will elute faster in a TLC experiment and have a larger Rf value compared to naphthalene due to its higher polarity resulting from the presence of a bromine atom.
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According to this chemical reaction, calculate the number of moles of KBr (119.00 g/mol) that will be produced from 272.08 grams of BaBr2 (297.13 g/mol).
BaBr2 + K2SO4 --> 2KBr + BaSO4
Report your answer to the hundredths.
Answers
Answer:
First, we need to find out how many moles of BaBr2 we have. We can do this by dividing the given mass by its molar mass:
Moles of BaBr2 = 272.08 g / 297.13 g/mol = 0.915 moles
From the balanced equation, we know that 1 mole of BaBr2 reacts with 2 moles of KBr. Therefore, we can use stoichiometry to find out how many moles of KBr will be produced:
Moles of KBr = 0.915 moles BaBr2 × (2 moles KBr / 1 mole BaBr2) = 1.83 moles KBr
Finally, we can use the molar mass of KBr to calculate its mass:
Mass of KBr = 1.83 moles × 119.00 g/mol = 217.77 g
Therefore, 272.08 grams of BaBr2 will produce 217.77 grams or 1.83 moles of KBr.
How can an invasive species like weeds affect crops on a farm?
A) It competes with the crops on that farm for resources.
B) It can turn productive land into unusable land.
C) It overtakes the crop population of that farm.
D) lț can serve as habitat for pests.
E) All of the above
Answers
Answer:
E
Explanation:
All of the above
What type of reaction occurs without the addition of heat?
A. An endothermic reaction
B. A reaction at equilibrium
C. A nonspontaneous reaction
D. A spontaneous reaction
Answers
The type of reaction that occurs without the addition of heat is called spontaneous reaction. That is option D.
What is spontaneous reaction?Spontaneous reaction is defined as the reaction where by new substances are formed naturally without the addition of extra energy in the form of heat.
Therefore, the type of reaction that occurs without the addition of heat is called spontaneous reaction
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consider a complete combustion process during which the reactants enter a combustion chamber at 20 c and leave at 700c. combustion is achieved with a) 100% theoretical air, b) 200% theoretical air and c) the chemically correct amount of pure oxygen.
Answers
A) 100% Theoretical Air: In this case, the combustion process would involve the reactants burning with atmospheric air, which is composed of 79% nitrogen and 21% oxygen.
What is atmospheric air?Atmospheric air is the air that surrounds the Earth and makes up the Earth's atmosphere. It consists of a mixture of gases, primarily nitrogen (78.09%), oxygen (20.95%), argon (0.93%), carbon dioxide (0.04%) and other trace gases. This mixture of gases is essential for life to exist on Earth as it provides the oxygen required by organisms for respiration.
This would mean that 79% of the air is not participating in the combustion reaction, so the combustion process would be incomplete and the temperature of the exhaust gases would be lower than 700 °C.
B) 200% Theoretical Air: In this case, the combustion process would involve the reactants burning with twice the amount of atmospheric air, which is composed of 79% nitrogen and 21% oxygen. This would mean that 42% of the air (twice the amount of oxygen) is participating in the combustion reaction, so the combustion process would be more complete and the temperature of the exhaust gases would be higher than 700 °C.
C) The Chemically Correct Amount of Pure Oxygen: In this case, the combustion process would involve the reactants burning with the chemically correct amount of pure oxygen, which is composed of 100% oxygen. This would mean that 100% of the air is participating in the combustion reaction, so the combustion process would be complete and the temperature of the exhaust gases would be close to 700 °C.
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SOMEONE HELP ME PLEASE
Enter answer for number 1
2:00 minutes
8:00 minutes
Answers
Based on factors affecting reaction rate , the time for colouring at cold temperature 5°C will be 8.00 minutes.
How does temperature affect rate of a reaction?The rate of a reaction increases with increase in temperature.
The increase in reaction rate is due to the increase in the kinetic energy of the molecules reacting.
A low temperature lowers reaction rate.
Thus, at cold temperature 5°C, the time for food colouring will be less than at room temperature.
Therefore, the time for colouring at cold temperature 5°C will be 8.00 minutes.
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draw the major 1,2-and 1,4- addition products formed when this diene reacts with hbr. do not include any byproducts formed. hbr
Answers
The major 1,2- and 1,4-addition products formed when a diene reacts with HBr are as follows:
1. For the 1,2-addition product: The diene reacts with HBr, and one of the double bonds undergoes addition with the hydrogen of HBr at the 1,2-position. This results in the formation of a monosubstituted alkyl bromide.
2. For the 1,4-addition product: The diene reacts with HBr, and the two double bonds undergo a concerted reaction with HBr. This leads to the formation of a cyclohexane ring, with the bromine atom attached at the 1,4-position.
In the 1,2-addition product, the HBr adds directly to one of the double bonds, resulting in a monosubstituted alkyl bromide. This is known as the Markovnikov addition. On the other hand, in the 1,4-addition product, the diene undergoes a concerted reaction, where both double bonds react simultaneously with HBr.
This results in the formation of a cyclohexane ring with the bromine atom attached at the 1,4-position. The 1,4-addition product is known as the anti-Markovnikov addition. The selectivity of these additions is determined by the stability of the carbocation intermediate formed during the reaction.
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one liter of cacl2 solution contains 2.5 moles of cacl2. what is the molarity of th solution
Answers
The molarity of the CaCl₂ solution, which contains 2.5 moles of CaCl₂ in one liter, is 2.5 mol/L.
Molarity is a measure of the concentration of a solute in a solution, expressed as the number of moles of solute per liter of solution (mol/L). In this case, the given information states that one liter of the CaCl₂ solution contains 2.5 moles of CaCl₂.
To calculate the molarity, we divide the number of moles of solute (CaCl₂) by the volume of the solution in liters (1 L):
Molarity = Number of moles of solute / Volume of solution (in liters)
Molarity = 2.5 moles / 1 L
Molarity = 2.5 mol/L
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2. A 1.500 g sample of a mixture containing only Cu₂O and CuO was treated with hydrogen to produce copper metal and water. After the water evaporated, 1.2244 g of pure copper metal was recovered. What is the percentage by mass of Cu₂O in the original mixture? Balanced chemical equations are given below for the reactions involved. CuO(s) + H₂(g) → Cu(s) + H₂O(l) Cu₂O(s) + H₂(g) → 2Cu(s) + H₂O(l)
Answers
The reaction of cuprous oxide gives 2 moles of copper metal and cupric oxide gives one mole of pure copper. Then, the mass of Cu₂O is 0.71 g. Then the mass percent of the Cu₂O in the mixture is 47.3 %.
What is mass percent ?The mass percent of a compound in a mixture is the ratio of its mass to the total mass of the mixture multiplied by 100. It measures how many grams of the compound is present in 100 g of the mixture.
Given that total mass of mixture = 1.5 g
let x g be the mass of Cu₂O and 1.5 -x be the mass of CuO.
According to law of mass conservation, the number of moles of copper in the reactant mixture is equal to its number of moles in the product side.
Molar mass of Cu₂O = 143 g/mol
molar mass of CuO = 79.5g
mass of Cu = 63.5 g
Then,
2 × 2x/143 + 1.5 -x/79.5 = 1.2244 g/63.5
159 x + 214.5 -143 x = 0.0192
x = 0.71 g
Then mass percent of Cu₂O = 0.71 g/1.5 g × 100 = 47.3 %.
Therefore, the mass percent of Cu₂O in the mixture is Cu₂O.
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QUESTION 20 Which of the following is a producer? oak tree raccoon cockroach human
Answers
Answer:
may be the first one is a producer
I hope this helps
9.Which part of the conductivity apparatus should you never touch
Answers
Answer:B- Leads
Explanation:
just did the quiz and got it right
describe the trend in viscosity of hydrocarbon fuels
Answers
Answer:
Hydrocarbons are the chemical compound that contain the elements carbon and hydrogen only.
They are compounds that are obtained from the fossil fuel crude oil by a process called fractional distillation.
alkenes are formed from the E2 reaction of 3-bromo-2,3-dimethylpentane and methoxide ion. Draw the structures of the alkene products and rank them according to the amount that would be formed.
Answers
The given chemical reaction is: E2 reaction of 3-bromo-2,3-dimethylpentane and methoxide ion. The structures of the alkene products and their ranking are required for this reaction.
The chemical reaction can be expressed as follows: So, the structures of alkene products can be shown as:Thus, there are two alkene products that are formed from this reaction, 2,3-dimethyl-2-hexene and 3-methyl-2-pentene.
Out of these two products, 2,3-dimethyl-2-hexene is the most stable and 3-methyl-2-pentene is less stable. Therefore, 2,3-dimethyl-2-hexene is major while 3-methyl-2-pentene is minor. The given chemical reaction is: E2 reaction of 3-bromo-2,3-dimethylpentane and methoxide ion. The structures of the alkene products and their ranking are required for this reaction.
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What is the Thermal Energy?
Answers
Answer:
Thermal Energy is a certain type of energy that Heats.
Explanation:
"Thermal" is derived from "Thermo" which means heat.
In a thorium decay series, thorium-232 loses a total of 6 alpha particles and 4 Beta particles in a 10-stage process. What is the final isotope produced?
Answers
The final isotope produced in the thorium decay series after losing 6 alpha particles and 4 beta particles in a 10-stage process is lead-208. This is because thorium-232 undergoes a series of alpha and beta decay, ultimately resulting in the stable isotope lead-208.
To find the final isotope produced, we need to track the changes in atomic mass and atomic number due to the loss of alpha and beta particles.
1. Alpha particles consist of 2 protons and 2 neutrons, so their loss will result in a decrease of 4 atomic mass units (AMU) and 2 atomic number units.
2. Beta particles are electrons emitted during the decay process, which leads to an increase of 1 atomic number unit without changing the atomic mass.
Now, let's apply these changes to thorium-232:
Initial isotope: Thorium-232 (atomic number 90, atomic mass 232)
Loss of 6 alpha particles:
- Decrease in atomic number: 90 - (6 * 2) = 78
- Decrease in atomic mass: 232 - (6 * 4) = 208
Loss of 4 beta particles:
- Increase in atomic number: 78 + (4 * 1) = 82
Final isotope: Atomic number 82 and atomic mass 208
The element with atomic number 82 is lead (Pb), so the final isotope produced is lead-208 (Pb-208).
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A tank initially contains 60 gal of pure water. Brine containing 1lb of salt per gallon enters the tank at 2gal/min, and the (perfectly mixed) solution leaves the tank at 3gal/min; thus the tank is empty after exactly 1 hour. Let y(t) be the amount of salt in the tank after t minutes. (a) Write an Initial Value Problem for the amount of salt in the tank at any time t<60). (b) Solve the IVP in part (a) to find the amount of salt in the tank at any time t<60). (c) Determine the amount of salt when the tank is half empty.
Answers
(a) Writing an Initial Value Problem for the amount of salt in the tank at any time t<60)Initial Value Problem (IVP) is a differential equation accompanied by initial conditions. The differential equation we will use is:
y′(t) = 2(1 − y(t)/V) − 3y(t)/Vwhere V is the volume of the tank and y(t) is the amount of salt in the tank at time t. The initial condition will be y(0) = 0(b) Solving the IVP in part (a) to find the amount of salt in the tank at any time t<60)To solve this differential equation, we can use the integrating factor method. The integrating factor is:
IF = e^(3t/V)Multiplying both sides by the integrating factor, we get:e^(3t/V) y′(t) + 3/V e^(3t/V) y(t) = 2e^(3t/V) − 2y(t)/V(e^(3t/V) y(t))′ = 2e^(3t/V)We integrate both sides with respect to t:(e^(3t/V) y(t)) = (2/3) e^(3t/V) + Cwhere C is the constant of integration. Using the initial condition, we find that:C = (2/3) e^0 = 2/3Therefore, the solution is:e^(3t/V) y(t) = (2/3) e^(3t/V) + (2/3)e^0y(t) = (2/3) + (2/3)e^(-3t/V)(c) Determining the amount of salt when the tank is half emptyThe tank is half empty when there is 30 gallons of solution in it. Since the tank is emptied in one hour, this happens when there is 30 gallons of brine in the tank. Therefore, the amount of salt in the tank when it is half empty is:y(60) = (2/3) + (2/3)e^(-3 × 60/V)We need to find V to solve for y(60). We know that the tank starts with 60 gallons of water, and 1 gallon of brine enters every minute and 3 gallons of solution leave every minute. Therefore, the volume of the tank is:
V = 60 + (1 − 3) t = 60 − 2tWhen t = 60, V = 60 − 2 × 60 = −60Therefore, the tank does not have a volume of −60. Instead, the problem has an error.About SaltSalt is a collection of chemical compounds with the main component Sodium Chloride (NaCL) being the same as table salt. The process of making salt in Indonesia is generally by evaporating seawater using sunlight or other heat sources. Salt is made by collecting seawater and then evaporating it with sunlight so that only the salt crystals remain. Traditional salt making is by channeling seawater into ponds with the help of windmills.Apart from being a natural preservative, salt also has many other benefits. As for some of the benefits of salt for the body is to help the digestive system. Salt is believed to help the digestive system because salt can stimulate the digestive enzymes chloride and protein which help digestion.
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Fe has __________ that is (are)unpaired in its d orbitals.
A. 1 electron
B. 2 electrons
C. 3 electrons
D. 4 electrons
Answers
Fe is the chemical symbol for iron, which has the atomic number 26. It is a metallic element that is silvery-gray in color, ductile and malleable, and magnetic in nature. The correct answer is option A, 1 electron.
Fe is the chemical symbol for iron, which has the atomic number 26. It is a metallic element that is silvery-gray in color, ductile and malleable, and magnetic in nature. Iron has four unpaired electrons in its d-orbitals and two electrons in its s-orbital. Its electronic configuration is [Ar] 3d6 4s2.
A d-orbital is a sublevel of the electron configuration of an atom. A d-orbital refers to the orientation and shape of the atomic orbitals in which the electrons reside. The d-orbitals, along with the s, p, and f orbitals, are the four types of orbitals available for electrons to occupy in an atom. d-orbitals can hold a maximum of ten electrons and are located in the second energy level and higher in an atom. Option A is correct.
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A student collects a sample of water from a pond. After a few minutes, some sediment settles out of the water. Which word best describes thA student collects a sample of water from a pond. After a few minutes, some sediment settles out of the water. Which word best describes this sample?is sample?
Answers
Distillation is one of the most effective methods for separating a soluble material from a given solution. Distillation, for example, can separate salt from a salt water combination.
What is the best separation method for separating water from salty water?The salt will be left behind as a solid if the water is boiled or evaporated. Distillation is a technique for collecting water. Since salt has a significantly greater boiling point than water, this works.
A sand and water combination can be separated by passing it through a sheet of filter paper. Water can travel through the microscopic holes in the paper, but sand particles are too large.
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which is not a way for carbon dioxide to reach the atmosphere
Answers
The process that is not a way for carbon dioxide to reach the atmosphere is Photosynthesis; option C
What is the carbon cycle?The carbon cycle is a biogeochemical cycle that describes the processes by which carbon is recycled between the living and non-living components of the environment.
The processes by which carbon is removed from the atmosphere and the processes by which carbon is returned to the atmosphere work together to ensure there is a balance of carbon in the environment.
The processes by which carbon is returned to the atmosphere in the form of carbon dioxide include the following:
respiration by living organismsburning of fossils fuelsdeath and decay of living organismsThe processes by which carbon is removed from the atmosphere include the following:
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Complete question:
Which of the following is not a way for carbon dioxide to reach the atmosphere?
a. forest fires
b. respiration
c. photosynthesis
d. burning of fossil fuels
In a longitudinal wave, particle displacement is
Answers
from google, so I think the answer to that question is the second one
please help me I have no idea what this is
Answers
. Name something chemistry related you are interested in or interested in learning about.
Answers
Answer: How The World Works
Explanation: Our world is made out of atoms, molecules and ions. Their behavior determines the properties of the substances we encounter in our daily lives: their structure, color, smell, and the way they interact with each other.
A thermometer is taken from a room where the temperature is 24
∘
C to the outdoors, where the temperature is −11
∘
C. After one minute the thermometer reads 7
∘
C. (a) What will the reading on the thermometer be after 4 more minutes? (b) When will the thermometer read −10
∘
C ? minutes after it was taken to the outdoors.
Answers
The thermometer will read -10°C after about 2.43 minutes.
(a) After four more minutes, the thermometer will read -1°C.
This is because the temperature difference between the room and outdoors is (24 - (-11)) = 35°C.
The thermometer then rises 7°C in one minute, so the thermometer is heated at 7°C/minute, i.e. 35°C in five minutes.
So the temperature of the thermometer after 4 more minutes is 7°C + 7°C + 7°C + 7°C = 28°C, 28°C - 35°C = -7°C, -7°C - 3°C = -10°C.
Thus the reading on the thermometer will be -1°C after four more minutes.
(b) To find out when the thermometer will read -10°C, use the formula:
time = (temperature difference ÷ heating rate) + time to start
= (-10°C - 7°C) ÷ 7°C/minute + 1 minute
= -17°C ÷ 7°C/minute + 1 minute≈ -2.43 minutes
Thus, the thermometer will read -10°C after about 2.43 minutes.
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what type of solid is H20 (ice)?
Answers
Answer:
Ice is a molecular and crystalline solid.
Explanation:
Water freezes at 0 degrees Celsius; it has strong molecular bonds between the hydrogen and oxygen atoms of each molecule, and weaker intermolecular bonds between each molecule of water. The polarity of the molecules helps align them into an organized, repeating patterned, crystalline structure when a solid.
chemistry between people is the stongest like mine and urs right?
Answers
Answer:
..sure....
Explanation:
Answer:
hmm i dont see it homie sike gimmi that bootiy
in one of your reaction cuvettes you've added 1.0 ml of dtnb, 20 ul of 30 um acsch, 20 ul of 5 um tacrine, and 20 ul of ace. what are the final concentrations of acsch and tacrine in that reaction? be sure to show units and your calculations.
Answers
Final concentrations of acsch and tacrine in that reaction is 600x10⁻¹²mm.
What is the purpose of tacrine?The symptoms for mild to moderate Hypertension are managed by tacrine. Alzheimer's disease cannot be cured or prevented from worsening with tacrine. However, some Alzheimer's sufferers may benefit from tacrine since it helps them think more clearly.
How would you define the reaction?The behavior, procedure, or event of responding. B: opposition or resistance to a power, influence, or movement, particularly: a propensity for an old-fashioned and typically obsolete social or political order or policy.
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what is the mass of of 3.20 X 10^23 particles of Co2?
Answers
Answer:
Mass = 23.36 g
Explanation:
Given data:
Number of particles of CO₂ = 3.20 ×10²³
Mass of CO₂ = ?
Solution:
1 mole contain 6.022×`10²³ particles,
3.20 ×10²³ particles × 1 mol / 6.022×`10²³ particles
0.531 mol
Mass of CO₂:
Mass = number of moles × molar mass
Molar mass = 44 g/mol
Mass = 0.531 mol× 44 g/mol
Mass = 23.36 g
What is not a product of modern chemistry ?
Answers
Answer:
Modern chemistry describes the composition, structure, and physical and chemical properties of substances. ... The main aim of modern chemistry is to improve the communication and conversation among the scientists, researchers, engineers, and policymakers, who are working under the area of modern chemistry
Explanation:
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