A sunflower turns toward the sun to absorb the greatest amount of energy. What type
of behavior is this?
A Dormancy
B Phototropism
C Hibernation
D Gravitropism

Answer:

Explanation:

NH3 + H2O ⇌ NH4  + OH-

0.35                              0.35

-log[OH-] = -log0.35 = 0.46 = pOH

14 - 0.46 = 13.54 = pH

Answer:

is this exam.. are you coping..

The odd one of the aforementioned substances is mixture because it is not a pure substance.

A pure substance is a substance that has a fixed chemical composition. In chemistry, molecules, elements and compounds are all pure substances.

Molecules are pure substances and they contain one or more types of chemical elements i.e. two or more atoms held together by chemical bonds.

Compounds are substances formed by chemical bonding of two or more elements in definite proportions by mass.

Elements are the simplest chemical substances that cannot be decomposed in a chemical reaction or by any chemical means.

However, mixtures are substances made up of two or more substances that are not even in their chemical composition. Mixtures are impure substances.

Therefore, the odd one of the aforementioned substances is mixture because it is not a pure substance.

Learn more about pure substances at: https://brainly.com/question/24462192

#SPJ1

The development of positive charge on carbon rod and negative charge on zinc causes development of voltage difference.

The voltage difference in any electrochemical reaction arises due to difference in charges on each side, which is further ascertained by the presence of electrons. Here we see that carbon rod becomes positively charged on flow of electrons while zinc rod becomes negatively charged.

The dry cell here indicates lack of acid in the cell. However, the replaced liquid here is moist electrolyte. Now the deposition of charged on each side on further connection with leads from outer side results in flow of electron and hence current is generated.

Learn more about dry cell -

https://brainly.com/question/23880282

#SPJ4

The first step of carbon cycle is animals are breaking down organic molecules and releasing carbon dioxide into the atmosphere.

Carbon cycle completes into four steps: photosynthesis, decomposition, respiration, and combustion.

In the first step, carbon enter the environment by respiration, and in the second step, carbon dioxide is consumed by plants.

Thus, the correct option is B.

Learn more about carbon cycle

https://brainly.com/question/1627609

#SPJ2

It is true that a process is ready if it is in a state in which its progress can continue.

A process is considered ready when it is in a state where it has been loaded into memory, and all its necessary resources are available for execution. This means that the process is waiting for the CPU to allocate it some processing time so that it can continue its progress. Thus, a process is considered to be ready if it is waiting in the CPU's ready queue for execution.

The concept of process states is fundamental to the functioning of an operating system. A process can be in one of several states at any given time, such as new, ready, running, waiting, terminated, etc. A process is considered ready when it has been loaded into memory, and all its necessary resources such as data and program code have been made available. The process enters the ready state when it is waiting for the CPU to allocate it some processing time so that it can continue its progress.

To know more about progress visit:-

https://brainly.com/question/29772046

#SPJ11

The cultures of prehistoric humans are primarily known through the excavation of stone tools and other durable artifacts, such as the Oldowan and Acheulian tool traditions.

Stone tools and imperishable artifacts serve as key archaeological evidence for understanding prehistoric cultures. Through meticulous excavation and analysis, archaeologists have been able to piece together the lifestyles, technological advancements, and social behaviors of early human societies. The term "paleolithic" refers to the Old Stone Age, a time when humans relied on stone tools as their primary implements.

The Oldowan tool tradition is considered the earliest stone tool industry, dating back around 2.6 million years ago. It is characterized by simple tools, such as choppers and scrapers, which were crafted by flaking off pieces from larger stones. These tools were primarily used for basic activities like butchering and processing animal carcasses.

Later, the Acheulian tool tradition emerged around 1.76 million years ago, representing an advancement in stone tool technology. Acheulian tools, such as handaxes and cleavers, were more refined and standardized, showcasing an increased level of sophistication in tool-making techniques. These tools served a wide range of purposes, including hunting, woodworking, and shaping raw materials.

By studying the Oldowan and Acheulian tool traditions, researchers gain valuable insights into the cognitive abilities, cultural development, and technological progress of early humans. The examination of these artifacts provides evidence of their adaptability, problem-solving skills, and the gradual refinement of their tool-making techniques over time.

Learn more about prehistoric humans

brainly.com/question/28301954

#SPJ11

Using  Speed, distance and time relation, the distance is 400 kilometers.

Distance is the sum of an object's movements, regardless of direction. Distance can be defined as the amount of space an object has covered, regardless of its starting or ending position.

The International System of Units defines a metre as the distance unit. It's interesting to note that many other derived units or quantities, such as volume, area, acceleration, and speed, may be constructed using this as the basic unit and a few formulae.

20 kilometers per hour is the speed per half-hour.

⇒ Speed in kilometers per hour: 40 × 2 = 80

Distance x time = speed

Distance = Time × Speed

= 80 × 5

= 400 miles

To learn more about Speed, distance and time from given link

https://brainly.com/question/26046491

#SPJ4

Answer:

20. mol

Explanation:

i got it right on my quiz

Answer:

Incomplete combustion of carbon occurs if enough air is not available to convert all of it to carbon dioxide, and in such as case carbon monoxide is formed by the addition of half the amount of oxygen as is present in carbon dioxide, to the carbon atom, namely, CO instead of CO2.

Explanation:

According to World Population Review 2022 the safest country to live are as follows.

These countries are listed safe by calculating global peace index.

This index measures the nation's and regions peacefulness and is finally reviewed by Institute of Economic and Peace (IEP).

The role of IEP is to measure peace at the worldwide and country level degree and lets us to evaluate the social, political and financial elements that create peace. Each year the Institute for Economics and Peace produces the Global Peace Index, the world’s main degree of countrywide peacefulness, rating 163 nations in line with their ranges of peace.

To know more about global peace click on:

brainly.com/question/16689991

#SPJ9

Answer:

225 mL of water must be added.

Explanation:

First we calculate how many HCl moles are there in 516 mL of a 0.191 M solution:

Now we use that number of moles (that remain constant during the dilution process) to calculate the final volume of the 0.133 M solution:

We can calculate the volume of water required from the volume difference:

Considering the reaction stoichiometry, the quantity of moles of H₂O produced is 3.02 moles.

The balanced reaction is:

CuO + H₂ → Cu + H₂O

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:  

The molar mass of the compounds present in the reaction is:

Then, by reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of mass of each compound participate in the reaction:  

Then, it is possible to determine the moles of H₂O necessary by the following rule of three:  If by reaction stoichiometry 79.55 grams of CuO produces 1 mole of H₂O, 240 grams of CuO produces how many moles of H₂O?

\(molesofH_{2} O=\frac{240 grams of CuOx 1 mole ofH_{2} O }{79.55 grams of CuO}\)

moles of H₂O= 3.02 moles

Finally, the quantity of moles of H₂O produced is 3.02 moles.

Learn more:

Answer:

melting and solidification

Answer: MELTING

Explanation:

The symbol "en" in this context is not related to the chemical reaction given in the question. "en" is actually an abbreviation for ethylenediamine, which is a type of ligand commonly used in coordination chemistry.

When water is added to anhydrous copper(II) sulfate, two observations are made:

The blue color of anhydrous copper(II) sulfate turns into a deep blue color as the water is added. This is because the anhydrous copper(II) sulfate is undergoing an exothermic reaction with the water to form hydrated copper(II) sulfate, which is blue in color.

As more water is added, the color becomes lighter and eventually the solution becomes clear. This indicates that all of the anhydrous copper(II) sulfate has reacted with water to form hydrated copper(II) sulfate.

Cobalt chloride can be used as a test for the presence of water because it is a hydrate that changes color when it loses its water of hydration. Anhydrous cobalt chloride is blue in color, while hydrated cobalt chloride is pink. When water is added to anhydrous cobalt chloride, it reacts with the water to form hydrated cobalt chloride, which is pink in color. This color change can be used to test for the presence of water in a sample.

To know more about the Anhydrous, here

https://brainly.com/question/14745510

#SPJ4

When the temperature rises by 1 Kelvin (1K), the response of water vapor is typically an increase in its concentration in the atmosphere. This is because warmer air can hold more water vapor due to its increased capacity to hold moisture.

As the temperature increases, the kinetic energy of water molecules also increases, leading to greater evaporation from liquid water sources such as oceans, lakes, and rivers. This increased evaporation results in an increased amount of water vapor in the air. Water vapor is a greenhouse gas, meaning it has the ability to absorb and emit infrared radiation. As the concentration of water vapor increases in response to rising temperature, it enhances the greenhouse effect, trapping more heat in the atmosphere. This positive feedback loop can further amplify the temperature increase, leading to more evaporation and an even higher concentration of water vapor.

Learn more about temperature here: brainly.com/question/29524629

#SPJ11

Answer:

69.2°C

Explanation:

Recall the heat energy formula

q = cmΔT

where q = heat energy ( measured in joules ) , c = specific heat , m = mass and ΔT = change in temperature.

We are given that:

Given this we want to find the temperature change.

First we want to define our variables.

Again recall that heat energy (q) = 450J , mass(m) = 50g and specific heat (c) = 0.13 J/g(degC)

Now that we have defined our variables we plug in the values of the variables into q = cmΔT and solve  for the undefined variable

q = cmΔT

q = 450 , m = 50, c = 0.13

450 = (50) x (0.13) x (ΔT)

multiply 50 and .13

450 = 6.5 x (ΔT)

divide both sides by 6.5

69.2 = ΔT

The change in temperature was 69.2°C

There are approximately 6.5 x 10²² atoms of iron in a 6.0 g sample of iron given that there are 6.0/55.85 moles of iron. Therefore, the correct option is 6.5 x 10²².

The mass of one mole of iron is 55.85 g, which is its molar mass. This means that there are 6.0/55.85 moles of iron in the 6.0 g sample of iron.

Here's how to calculate the number of atoms in a sample of iron:

6.0 g Fe × 1 mol Fe/55.85 g Fe × 6.022 x 10²³ atoms Fe/1 mol Fe = 6.5 x 10²² atoms Fe

Therefore, there are approximately 6.5 x 10²² atoms of iron in a 6.0 g sample of iron. Therefore, the correct option is 6.5 x 10²².

More on iron: https://brainly.com/question/12898212

#SPJ11

Hi! I'm happy to help you with writing the Ki expression for the aluminum tetrahydroxide ion. The Ki expression, also known as the equilibrium constant expression, is a mathematical expression that relates the concentrations of reactants and products at equilibrium. For the aluminum tetrahydroxide ion, the dissociation reaction can be represented as:

Al(OH)₄⁻ ↔ Al³⁺ + 4OH⁻

The Ki expression for this reaction would be:

Ki = [Al³⁺][OH⁻]^4 / [Al(OH)₄⁻]

In this expression, [Al³⁺], [OH⁻], and [Al(OH)₄⁻] represent the equilibrium concentrations of the aluminum ion, hydroxide ion, and aluminum tetrahydroxide ion, respectively.

More on what  is Ki: https://brainly.com/question/3159758

#SPJ11

Answer b

Explanation:

The equation that represents a single replacement reaction given the various options is 2Al(s) + 6HCl -> 2AlCl₃(aq) + 3H₂O(g) (option 2)

A single replacement reaction, also known as single displacement reaction is a reaction in which elements higher in the electro-chemical series displace or replace elements lower in the electro-chemical series displace from a solution.

The following example illustrates single replacement reaction:

A + BC -> AC + B

From the above reaction, we can see that A has replace/displace B to from AC.

With the above information, we can determine the equation that represents single replacement reaction. Details below:

Equation from the questions:

From the above, we can see that only 2Al(s) + 6HCl -> 2AlCl₃(aq) + 3H₂O(g) conform to single replacement reaction.

Thus, the correct answer to the question is: 2Al(s) + 6HCl -> 2AlCl₃(aq) + 3H₂O(g) (option 2)

Learn more about single replacement reaction:

https://brainly.com/question/29662825

#SPJ1

The optimum temperature for sucrase activity is 37 °C. The hydrolysis of sucrose is slowest at 0 °C.

The optimum temperature for sucrase activity is 37 °C, which means that the enzyme functions most efficiently at this temperature. As the temperature deviates from the optimum, the enzyme activity decreases. Therefore, the hydrolysis of sucrose would be slowest at a temperature that is significantly lower or higher than 37 °C.

Among the given choices, the temperature that is significantly lower than 37 °C is 0 °C (choice e). Enzyme activity is typically greatly reduced or completely halted at very low temperatures, as the enzyme molecules become less active or may even denature. Therefore, the hydrolysis of sucrose would be slowest at 0 °C.

To learn more about temperature

https://brainly.com/question/30033084

#SPJ11

The initial amount a0 of a radioactive substance with a half-life of t will decay to 1/4 a0 in 2t.

If a radioactive substance has a half-life of t, it will take an initial amount a0 of the substance to decay to 1/4 a0 in 2t. This is because after one half-life (t), the amount of the substance will be reduced to 1/2 a0.

After another half-life (t), the amount will be reduced to 1/4 a0. Therefore, the total time it takes for the substance to decay to 1/4 a0 is 2t.

Here is the step-by-step explanation:

1. Start with the initial amount a0.
2. After one half-life (t), the amount will be reduced to 1/2 a0.
3. After another half-life (t), the amount will be reduced to 1/4 a0.
4. The total time it takes for the substance to decay to 1/4 a0 is 2t.

To know more about half-life click on below link:

https://brainly.com/question/16387602#

#SPJ11

we find the energy to be approximately \(3.41 * 10^-19\) Joules is the answer.

To calculate the wavelength of a photon with a frequency of 61.7 MHz, we can use the formula: wavelength = speed of light / frequency. The speed of light is approximately\(3 * 10^8\) meters per second.

Converting the frequency to Hz (\(1 MHz = 10^6 Hz\)), we have \(61.7 * 10^6\)Hz.

Plugging these values into the formula, we get: wavelength =\((3 * 10^8 m/s) / (61.7 * 10^6 Hz).\)

Simplifying, we find the wavelength to be approximately 4.862 meters.

Now, to calculate the energy of a photon with a wavelength of 582.8 nm, we can use the equation: energy = Planck's constant × speed of light / wavelength.

Planck's constant is approximately \(6.63 * 10^-34\) Joule-seconds.

Converting the wavelength to meters (\(1 nm = 10^-9 m\)), we have \(582.8 * 10^-9 m.\)

Plugging these values into the equation, we get: energy =\((6.63 * 10^-34J·s) * (3 * 10^8 m/s) / (582.8 * 10^-9 m).\)

Simplifying, we find the energy to be approximately \(3.41 * 10^-19\) Joules.

know more about wavelength

https://brainly.com/question/31143857

#SPJ11

Answer:2

Explanation:

Answer: 1.34 M

Explanation:

Answer:

2.18 * 10^12 mg

Explanation:

1 nanogram [ng] = 10^6 milligram [mg]

2.18 * 10^6 ng/ 1 ng = X mg / 10^6 mg

X mg = 2.18 * 10^12 mg

Answer:

2.18 * 10^12 mg

Explanation

When the umbilical cord is tied after birth, the umbilical arteries close by filling in with connective tissue. The umbilical arteries carry deoxygenated blood from the fetus to the placenta, where the blood is oxygenated and returned to the fetus via the umbilical vein.

When the umbilical cord is cut, the flow of blood from the placenta to the fetus ceases, and the umbilical arteries and vein begin to constrict. This constriction is caused by the contraction of smooth muscles in the vessel walls and the closure of small valves within the vessels. As the umbilical arteries constrict, the flow of blood to the placenta decreases and the vessels begin to fill in with connective tissue. Over time, the connective tissue replaces the smooth muscle and valve tissue in the vessel walls, resulting in the complete closure of the umbilical arteries. This process is important to prevent bleeding and infection in the newborn.

Learn more about placenta here:

https://brainly.com/question/26959441

#SPJ11

The percent recovery of aspirin is 26.7% (rounded to the nearest percent).

This can be calculated by taking the final mass of the aspirin solids (20 mg) divided by the maximum mass of aspirin present in the original 75 mg crude sample and multiplying by 100. The given data:

Mass of crude sample = 75mg

Mass of aspirin in crude sample = 100% of 75 mg = 75mg

Mass of aspirin recovered = 20mg

Using the formula to calculate the percentage yield,

Percentage yield = (mass of product obtained/ theoretical mass of product) × 100

The theoretical mass of aspirin would be the mass of aspirin that would have been obtained if there was 100% recovery.

Therefore, 20 mg / 75 mg * 100 = 26.7%.
Percentage yield = (20mg/ 75mg) × 100= 26.7%

Therefore, the percentage recovery is 26.7% (rounded off to the nearest percent).

To know more about Aspirin refer here :

https://brainly.com/question/29699947

#SPJ11

Reverse direction: Reaction is not spontaneous; reactants favored at 25°C.

To calculate ΔS°rxn, we can use the following equation:

ΔG°rxn = -RTlnK

where R is the gas constant (8.314 J/mol*K), T is the temperature in Kelvin (298 K), K is the equilibrium constant, and ΔG°rxn is the standard Gibbs free energy change for the reaction.

Since ΔG°rxn = ΔH°rxn - TΔS°rxn, we can rearrange the equation as:

ΔS°rxn = (ΔH°rxn - ΔG°rxn) / T

We are given ΔH°rxn as -44.2 kJ, so we need to calculate ΔG°rxn and then use the equation above to find ΔS°rxn.

To calculate ΔG°rxn, we can use the following equation:

ΔG°rxn = ΣnΔG°f(products) - ΣnΔG°f(reactants)

where ΔG°f is the standard Gibbs free energy of formation of each compound, n is the number of moles of each compound in the balanced chemical equation, and the values are given in the table of thermodynamic properties.

For the given reaction, the equation becomes:

ΔG°rxn = [ΔG°f(C2H5OH) - ΔG°f(C2H4) - ΔG°f(H2O)] = [-277.6 - (2*68.3) + (-237.1)] = -39.9 kJ

Now we can substitute the values we have calculated into the equation for ΔS°rxn:

ΔS°rxn = (-44.2 kJ - (-39.9 kJ)) / (298 K) = -0.014 J/K

Since ΔS°rxn is negative, the reaction is not spontaneous at 25°C and standard pressure in the direction as written. However, we can use the Gibbs free energy equation to determine in which direction the reaction will be spontaneous:

ΔG°rxn = -RTlnK

For a spontaneous reaction, ΔG°rxn must be negative, which means that lnK must be negative. Since lnK is negative, K must be less than 1, which means that the reactants are favored at equilibrium. Therefore, the reaction will proceed in the reverse direction as written (i.e. from C2H5OH to C2H4 and H2O) at 25°C and standard pressure.

Learn more about thermodynamic

brainly.com/question/31275352

#SPJ11