Hellllllpppppp this is soooo hard

Answer:

The answer is cows break down the food that they eat

Explanation:

Organisms, such as cows, that eat plants or animals break down the food they have eaten using acids and digestive enzymes. The broken down food is used by their bodies to produce building materials and the energy that they need to survive.

Answer: It is true.

Explanation: Hope it helps! :)

Answer:

false

Explanation:

the correct answer is Forensic Technology, Inc.

The answer is D transformed

Answer:

ay nose

Explanation:

2KOH + H2SO4 = K2SO4 + 2H20

From the reaction, it can be seen that KOH and H2SO4 have the following amount of substance relationship:

n(KOH):n(H2SO4)=2:1

From the relationship we can determinate required moles of H2SO4:

n(KOH)=c*V=0.15M*0.025L= 0.00375 mole 

So,

n(H2SO4)=n(KOH)/2= 0.00375/2= 0.00188 moles

Now, when moles of H2SO4 is known, concentration can be calculated: 

c(H2SO4)=n/V= 0.00188mole/0.015L= 0.125M

For the purpose we will use the following equation for potential energy:

U = m * g * h

In the above equation, m represents the mass of the object, h represents the height of the object and g represents the gravitational field strength (9.8 N/kg on Earth).

When we plug values into the equation, we get following:

U= 50kg * 9.8 N/kg *9m = 4410 J

Answer:

nuclear energy i think

Explanation:

The environmental change that occur fastest is the volcanic eruption.

It should be noted that the volcanic eruption simply means when lava when gas are released from volcano.

The environmental change that occur fastest is the volcanic eruption and it should be noted that the most dangerous one is known as the glowing avalanche.

Learn more about volcano on:

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Final answer:

The fastest environmental changes today include climate change, loss of biodiversity, and alterations to the water cycle, all of which are significantly accelerated by human activities, particularly since the mid-20th century.

Explanation:

Notably, the fastest environmental changes currently occurring relate to climate change, loss of biodiversity, and changes in water cycles. These changes are largely driven by human activities, notably since the mid-20th century, a period often referred to as the Great Acceleration, indicating a steep increase in population growth, GDP, and resource consumption leading to a profound ecological impact. Climate change is one of the most dramatic examples of rapid environmental alteration. It is occurring at a pace unprecedented in human history, with global temperatures projected to rise significantly within a single century, a rate at least 100 times faster than naturally occurring changes. This swift change is too rapid for many social systems, natural species, and ecosystems to adapt, leading to increased risks of extinction, spread of diseases, and more frequent catastrophic natural disasters.

Another swift change is seen in the loss of biodiversity, where species are going extinct at a rate much higher than the natural background rate, primarily due to habitat destruction, pollution, overexploitation, and climate change. Additionally, water cycles are being altered, with some regions experiencing more intense droughts and others more severe flooding, challenging existing agricultural practices and water management systems.

Answer: Option (c) is the correct answer.

Explanation:

When a system is open then there will be exchange of energy between the system and surrounding.

Whereas when a system is closed then there will be no exchange of energy, that is, thermal energy will not flow into the atmosphere.

Thus, we can conclude that a sealed calorimeter is a closed system because thermal energy is not transferred to the environment.

Final answer:

A sealed calorimeter is a closed system because it does not allow thermal energy to transfer to the environment, allowing for conservation of energy within the system. The correct option is c.

Explanation:

A sealed calorimeter is considered a closed system primarily because thermal energy is not transferred to the environment. By being sealed, it allows energy in the form of heat to be exchanged within the system (the chemical reaction and the water in which the reaction occurs), but it does not allow matter or heat to escape or enter from the external environment. The principle that supports the calorimeter's status as a closed system is the conservation of energy, meaning no overall energy change occurs during the chemical reaction when considering both the system and its surroundings.

Differentiating between types of systems, an open system can exchange both energy and matter with its surroundings, such as a pot of boiling water. A closed system, like a sealed calorimeter, can exchange energy but not matter. An isolated system exchanges neither energy nor matter, but such systems are theoretical as all real systems will eventually exchange some energy with their surroundings.

The sealed calorimeter fits the definition of a closed system because it allows for the exchange of energy within the system while maintaining its mass constant, indicating that no mass is exchanged with the external environment.

Ans :4.5 * 10²³ molecules

Given:

Moles of CH4 = 0.75

To determine;

The number of molecules of CH4 in 0.75 moles

Explanation:

1 mole of CH4 contains Avogadro's number i.e. 6.023*10²³ molecules

Therefore, 0.75 moles would correspond to :

= 0.75 moles * 6.023*10²³ molecules/1 mole

= 4.5 * 10²³ molecules

Answer:

4.5

Explanation:

Rock records are not an evidence of pre-existing lives.

The flora and fauna constitute the living species of all the plant and animals including the humans. The animal and plant that might have existed long ago can never physically leave evidence in the form of fresh leaves and flesh.

The fossil of the animals and humans and other life forms gives us a clear evidence of what kind of life existed in the years preceding us.

Hence, the correct answer is option B that is fossils.

Answer:

Explanation:

Separation

To find the number of molecules in 3.2 mol of ammonia (NH3), we can use Avogadro's number. Multiply 3.2 mol by Avogadro's number (approximately 6.022 x 10^23 molecules/mol) to get approximately 1.9264 x 10^24 molecules.

To calculate the number of molecules in 3.2 mol of ammonia (NH3), we can use Avogadro's number. Avogadro's number is approximately 6.022 x 1023 molecules/mol. So, to find the number of molecules in 3.2 mol of ammonia, we multiply 3.2 mol by Avogadro's number:

Number of molecules = 3.2 mol x 6.022 x 1023 molecules/mol = 1.9264 x 1024 molecules

Therefore, there are approximately 1.9264 x 1024 molecules in 3.2 mol of ammonia.

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We know that

Kp = Product of partial pressures of products / product of partial pressures of reactants

For given reaction

Br2(g) + Cl2(g) ↔ 2 BrCl(g)

Q = p^2BrCl / pBr2 X pCl2   [Q= reaction quotient]

now as given that there is only BrCl in the container so the pressure of BrCl will be only pressure to be accounted

Hence

Q= (0.5)^2 = 0.25

Now as Q > Kc The reaction will move in backward direction or left side or reactant side s

so answer is

Q > K and the reaction moves to the left

The reaction will  B) move to the left since Q > K.

The equilibrium constant, K, describes the reaction at equilibrium. It provides insight on whether the formation of the reactants or products are favored at equilibrium.

The value of the equilibrium constant is determined from the following expression:

[tex]K \ = \frac{[products]}{[reactants]}[/tex]

It is simply the ratio of the concentration of the products and the concentration of reactants at equilibrium.

If the value of the equilibrium constant, K, is greater than 1, then, at equilibrium, the formation of products is favored. If K is less than 1, then the formation of reactants will be favored.

For systems, however, that are not yet at equilibrium, the direction of the reaction that will lead to equilibrium can be determined using another constant called the reaction quotient, Q. It is obtained using the similar expression as K but instead of using the equilibrium concentrations of the reactants and products, their initial concentrations are used.

The value of Q indicates whether the formation of products or reactants are favored so that equilibrium is achieved. If Q is greater than K, then the formation of reactants (or the reverse reaction) is favored. If Q is less than K, then the formation of products (forward reaction) is favored.

In this problem, the reversible equation provided is:

Br₂(g) + Cl₂(g) ⇄ 2 BrCl(g)            K= 0.150

To obtain the Q value, the initial concentration (in this case the partial pressure)  of the substances are plugged into the equilibrium expression. Since there are no  Br₂(g) and Cl₂(g) initially, only the partial pressure of BrCl will be used in the equation:

[tex]Q = \frac{[BrCl]^2}{[Br_{2}][Cl_{2}]} \ or \ Q = \frac{P_{BrCl}^2}{P_{Br_{2}}P_{Cl_{2}}}\\\\Q = P_{BrCl}^2\\Q = (0.500 \ atm)^2\\\boxed {Q = 0.250}[/tex]

Comparing the Q vs. K,

Q = 0.250 and K = 0.150, hence,

[tex]0.25 > 0.150\\\\\boxed {\boxed {Q > K, the \ reverse \ reaction \ will \ be \ favored; \ the \ reaction \ moves \ to \ the \ left}}[/tex]

Keywords: Equilibrium Constant, Reaction Quotient