How does a catalyst speed up a chemical reaction? A. by lowering the activation energy B. by lowering the ΔH of the reaction C. by raising the energy of the products D. by raising the energy of the reactants

Answer: thermal conductivity

Explanation:

Increased wind speed over the ocean. Or more room for other potential uses of the land where wind farms take space.

In an ecosystem, the advantage of offshore wind farms is that it is more likely to get out of sight.

An ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the ecosystem through the process of photosynthesis .Animals play an important role in energy transfer as they feed on each other.As a result of this transfer of matter and energy takes place through the ecosystem .Living organisms also influence the quantity of biomass which is  present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.

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TLDR: A.

Understanding the idea of chemical equations is sometimes a hard concept to grasp in general chemistry because it’s typically not explained well. What a chemical equation represents is what literally happens on the subatomic level. The coefficients in front of the reactants and products mean, number for number, what you would get if you performed the reaction. It’s like an atomic recipe - you can only “make” things when you have enough ingredients. When an ingredient runs out, you can’t produce any products anymore. The ingredient that runs out the quickest is known as the “limiting reagent”, as it literally limits what you can produce.

In the equation above, 2 equivalents of “a” and 3 equivalents of “b” are consumed to produce the products. This means that “b” gets consumed faster than “a”. To make one sample of products, you need two molecules of “a” and three molecules of “b”. If you start out with four moles of each reactant (the same number of atoms), you’ll run out of “b” before “a” because the reaction consumes more molecules of “b” than molecules of “a”. Therefore, the answer would be A. You would need 6 moles of “b” to finish the reaction and use up the remaining “a” (a 2:3 ratio, just like in the balanced equation).

Hope this helps!

Final answer:

The limiting reactant is determined by dividing the moles of each reactant by its stoichiometric coefficient. Reactant 'B' is limiting because it gives a smaller ratio compared to 'A' after the division, indicating that it will be consumed first.

Explanation:

Identifying the Limiting Reactant

To determine the limiting reactant, you must first understand the stoichiometric relationship between reactants in a balanced chemical equation. In the given equation 2a+3b → c, the stoichiometry indicates that 2 moles of a react with 3 moles of b to produce c. We have 4.0 moles of both a and b. To find the limiting reactant, divide the number of moles of each reactant by its respective coefficient:

For a: 4.0 moles ÷ 2 = 2

For b: 4.0 moles ÷ 3 = 1.33

Reactant b will run out first because it produces a smaller ratio (1.33) compared to reactant a (2) when divided by their coefficients. Therefore, b is the limiting reactant, and the correct answer is 'A) B is limiting because 4.0 mol and 6.0 mol are needed'.

Answer:

cornell noted

Explanation:

used in middle school and can be helpful for subjects like ela history and science

Answer:

Cornell notes

(picture attached)

Explanation:

out of the 5 methods the most popular and efficient is Cornell notes :)

↓methods↓

1)The Cornell Method.

2)The Outlining Method.

3)The Mapping Method.

4)The Charting Method.

5)The Sentence Method

×║hope this helps║×

Answer:

Explanation:

molarity is moles of solute/L solution

5.5 g                         1 moles Kl             1000 mL

_____                   *  __________    *    ________ = 0.22088 M

150 ml of solution     166 grams              1 L

       (39 grams K+ 127 grams I) ^

Answer:

[tex]\boxed{\text{0.22 mol/L}}[/tex]

Explanation:

[tex]\text{Molar concentration} = \dfrac{\text{moles}}{\text{litres}}\\\\\text{c} = \dfrac{n}{V}[/tex]

1. Convert grams to moles.  

[tex]\text{Moles KI = 5.5 g KI} \times \dfrac{\text{1 mol KI}}{\text{166.0 g KI}} = \text{0.0331 mol KI}[/tex]

2. Convert millilitres to litres  

[tex]\text{V = 150 mL} \times \dfrac{\text{1 L}}{\text{1000 mL}} = \text{0.1500 L}[/tex]

3. Calculate the molar concentration

[tex]c = \dfrac{\text{0.0331 mol}}{\text{0.1500 L}} = \text{0.22 mol/L}[/tex]

The molar concentration of KI is [tex]\boxed{\textbf{0.22 mol/L}}[/tex].

Answer:

linear

Explanation:

The shape of BCl₂ is linear. The central Be atom has 2 valance electron and so Be has coordination number of 2. In the Be-Cl covalent bond a pair of electron is shared by the Be and the Cl atoms. The bond angle in BeCl₂ is 180°. To account for the bond angle it has been proposed that Be has sp hybridization and each of the two sp hybrid orbital of Be overlaps with the p orbitals of Cl.

The molecular geometry, or shape, of beryllium chloride (BeCl₂) is linear. Therefore, option B is correct.

Beryllium chloride consists of one beryllium atom (Be) bonded to two chlorine atoms (Cl). The beryllium atom has two valence electrons, and it forms two sigma bonds with the chlorine atoms by sharing its electrons.

Since there are no lone pairs of electrons on the central beryllium atom, the molecule adopts a linear geometry, where the two chlorine atoms are arranged in a straight line, with the beryllium atom in the center.

Thus, beryllium chloride has linear geometry.

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Answer:

B. 0.16 M H₂SO₄.

Explanation:

Rate ∝ [Reactants].

So, the reaction occurs fastest in the highest concentration of H₂SO₄.

So, the answer is: B. 0.16 M H₂SO₄.

Answer:

[tex]\boxed{\text{Electrostatic and magnetic forces}}[/tex]

Explanation:

I can think of two non-contact forces:

Answer:

This question is incomplete.

Explanation:

Force is classified either as contact or non-contact force.

A contact force is a force that requires physical contact/touch with the object. For example, the pushing of a car, the kicking of a ball and the pulling of a door.

Non-contact force is a force that does not require a physical touch/contact with the object. Examples of non-contact force is the force of gravity that pulls object towards itself on earth, force that repels two magnets (of like/similar pole facing each other) and the force that pulls a metallic object in a magnetic field.        

Answer:

28

Explanation:

28 is correct. (NH4)2 is equal to 10 atoms. (8 H and 2 N ) CO3 is equal to 4 atoms. (1 C and 3 O) That's 14 atoms. But it's two molecules of this. So you just multiply by the number of molecules (2), and you get 28.

Answer:

14

Explanation:

Answer:

1.325 x 10²⁴ Co atoms

Explanation:

1 mol of any substance is made of 6.022 x 10²³ units, these units could be atoms making up elements of molecules making up a compound.

Therefore 1 mol of the element cobalt is made of 6.022 x 10²³ atoms of Co

so if 1 mol of Co contains - 6.022 x 10²³ atoms of Co

then 2.2 mol of Co contains - 6.022 x 10²³ /mol x 2.2 mol

number of Co atoms in 2.2 mol of Co is - 1.325 x 10²⁴ Co atoms

Answer:

What is the question?

Explanation:

Answer:

Gutenberg

Explanation: inventor, printer

Answer:

Bonds are broken and new bonds are formed during chemical reactions only.

Explanation:

So, the right choice is:

Bonds are broken and new bonds are formed during chemical reactions only.

Final answer:

Bonds are broken and new bonds are formed during chemical reactions only, not during physical changes. A chemical reaction reorganizes atoms into new substances, which involves breaking old bonds and forming new ones, fundamentally changing the composition of the reactants.

Explanation:

The true statement is that bonds are broken and new bonds are formed during chemical reactions only. During a chemical reaction, reactants undergo a transformation where their chemical bonds are broken, atoms are rearranged, and new substances with new bonds are formed, called products. This process involves energy changes, where breaking bonds requires an input of energy while forming bonds releases energy.

Conversely, physical changes involve a change in the form or physical properties of a substance, without altering the chemical composition or the bonds within molecules. Thus during chemical reactions, old bonds are broken, and new bonds form to create new substances with different chemical and physical properties; this is essential in defining a chemical change. Physical changes, on the other hand, do not involve changes in the bonds that hold atoms together within a molecule.

Answer:

Short-term environmental changes can cause changes in genetic makeup, Short-term environmental changes can occur in minutes to hundreds of years, short-term environmental changes immediately affect organisms in the environment

Explanation:

Short-term environmental changes happen fast and with power to kill and change many organisms

Answer: Short-term environmental changes causes changes in genetic makeup.

Short-term environmental changes can occur in minutes to hundreds of years.

Short-term environmental changes immediately affect organisms in the environment.

Explanation:

Short-term environment change can be define as changes in the environment the affect or impact of which last for a short duration but can be drastic and may recover with the passage of time. Duration of these changes last for minute to years.

These changes can be manipulate the genome, morphology or physiology of organisms for example the case of short to prolonged exposure of radiations.

Answer:

Massive

Explanation: some astroids are so large they can destroy planets.

Answer:

The answer is Varied

Explanation:

Answer:

They retain their chemical properties

Explanation:

Answer: They retain their chemical properties

Explanation:

Mixture is a substance which has two or more components which do not combine chemically and do not have any fixed ratio in which they are present.

For example: Air is a mixture which consists of various gases, water vapors and various particles in solid form which are not present in any fixed ratio, do not combine chemically and thus retain their chemical properties.

Thus the only true statement about substances in a mixture is that they retain their chemical properties

Answer:

The volume would be 800mL and it shows that it is constant.

Explanation:

Given parameters:

Intial volume of gas V₁ = 800mL

Initial temperature T₁ = -23°C to Kelvin; we use K = °C + 273 = -23 + 273 =                                                          250K

Inital pressure P₁ = 300torr

Final temperature T₂ = 227°C to K = 227 + 273 = 500K

Final pressure P₂ = 600torr

Unknown parameter:

Final volume V₂ = ?

To solve this problem, we use the General gas law or the combined gas law where we assume that n=1, this gives:

             [tex]\frac{P_{1} V_{1} }{T_{1} }[/tex] =   [tex]\frac{P_{2} V_{2} }{T_{2} }[/tex]

Since the unknown is V₂, we make it the subject of the formula:

                V₂ = [tex]\frac{P_{1} V_{1} T_{2} }{P_{2} T_{1} }[/tex]

                V₂ = [tex]\frac{300x800x500}{600x250}[/tex]

                V₂ = 800mL

After the temperature and pressure changes the final volume of the gas is calculated to be approximately 800.05 mL.

To find the final volume of a gas when given changes in temperature and pressure, we use the combined gas law:

(P₁ * V₁)/T₁ = (P₂ * V₂)/T₂

Here, the variables represent:

The initial conditions given are:

First, convert the temperatures to Kelvin:

T = -23.0 + 273.15 = 250.15 K

T₂ = 227.0 + 273.15 = 500.15 K

Next, apply the combined gas law to find V₂:

(300.0 torr * 800.0 mL) / 250.15 K = (600.0 torr * V₂) / 500.15 K

Solving for V₂:

[tex]V_2 &= \left( \frac{(300.0 \, \text{torr}) \times (800.0 \, \text{mL})}{250.15 \, \text{K}} \right) \times \frac{500.15 \, \text{K}}{600.0 \, \text{torr}} \\\\V_2 &= \left( \frac{240000 \, \text{torr} \cdot \text{mL}}{250.15 \, \text{K}} \right) \times \frac{500.15 \, \text{K}}{600.0 \, \text{torr}} \\\\V_2 &= \left( \frac{240000}{250.15} \right) \times \frac{500.15}{600.0} \\\\V_2 &= 959.90 \times 0.83358 \\\\V_2 &\approx 800.05 \, \text{mL}[/tex]

Therefore, the final volume of the gas is approximately 800.05 mL.

Answer:

I. Changing the pressure:

II. Changing the temperature:

III. Changing the H₂ concentration:

Explanation:

Le Châtelier's principle states that when there is an dynamic equilibrium, and this equilibrium is disturbed by an external factor, the equilibrium will be shifted in the direction that can cancel the effect of the external factor to reattain the equilibrium.

I. Changing the pressure:

For the reaction: CH₄(g) + 2H₂S(g) ⇄ CS₂(g) + 4H₂(g),

The reactants side (left) has 3.0 moles of gases and the products side (right) has 5.0 moles of gases.

II. Changing the temperature  

The reaction is endothermic since the sign of ΔH is positive.

CH₄(g) + 2H₂S(g) + heat ⇄ CS₂(g) + 4H₂(g).

The T is a part of the reactants, increasing the T increases the amount of the reactants. So, the reaction will be shifted to the right to suppress the effect of increasing T and the amount of H₂S(g) will decrease.

The T is a part of the reactants, increasing the T decreases the amount of the reactants. So, the reaction will be shifted to the left to suppress the effect of decreasing T and the amount of H₂S(g) will increase.

III. Changing the H₂ concentration:

H₂ is a part of the products.

H₂ is a part of the products, increasing H₂ increases the amount of the products. So, the reaction will be shifted to the left to suppress the effect of increasing H₂ and the amount of H₂S(g) will increase.

H₂ is a part of the products, decreasing H₂ decreases the amount of the products. So, the reaction will be shifted to the right to suppress the effect of decreasing H₂ and the amount of H₂S(g) will decrease.

Answer:

A

Explanation:

Although rounding is needed, this answer makes the most sense.

If the question is (2.5 x 10^3) + (3.5 x 10^2):

= (2.5 x 1000) + (3.5 x 100)

=(2500) + (350)

= 2850.

Taking out the 10^3 with scientific notation leaves us with 2.85 x 10^3. Because this isn't an answer choice, A is the closest.

To find the sum of 2.5 x 10^3 and 3.5 x 10^2, both numbers must be expressed with the same exponent, which leads to the result of 3.75 x 10^4. None of the provided options match this result, suggesting there may be an error in the original question or answer choices.

To add 2.5 x 10^3 and 3.5 x 10^2, we need to express both numbers with the same exponent. Here's how we do it step-by-step:

Recognize that 10^3 is the same as 1000 and 10^2 is the same as 100.

Convert 3.5 x 10^2 to a number with an exponent of 3: (3.5 x 10^2) x 10 = 35 x 10^2.

Add the two numbers together: (2.5 x 10^3) + (35 x 10^2).

Since both numbers now have the same exponent, combine the coefficients: 2.5 + 35 = 37.5.

Finally, express the sum as a scientific notation: 37.5 x 10^3.

This simplifies to 3.75 x 10^4 when we adjust the coefficient to keep the number in scientific notation form. However, this result is not listed in the provided options. It seems there might be a mistake in the question or the answer choices. Please double-check the question and the options.

Answer:

70mol

Explanation:

The equation of the reaction is given as:

                  2C₂H₂ + 5O₂ → 4CO₂ + 2H₂O

Given parameters:

Number of moles of acetylene = 35.0mol

Number of moles of oxygen in the tank = 84.0mol

Unknown:

Number of moles of CO₂ produced = 35.0mol

Solution:

From the information given about the reaction, we know that the reactant that limits this combustion process is acetylene. Oxygen is given in excess and we don't know the number of moles of this gas that was used up. We know for sure that all the moles of acetylene provided was used to furnish the burning procedure.

To determine the number of moles of CO₂ produced, we use the stoichiometric relationship between the known acetylene and the CO₂ produced from the balanced chemical equation:

From the equation:

         2 moles of acetylene produced 4 moles of CO₂

          ∴ 35.0 mol of acetylene would produced:  

                               [tex]\frac{35 x 4}{2}[/tex] = 70mol

Answer:

70 mol

the next one is 67.2

Explanation:

:) have a great day

Final answer:

To find the number of phosphorus atoms in 4.90 mol of copper(II) phosphate, first calculate the number of moles of phosphorus atoms in copper(II) phosphate follow by using Avogadro's number to convert moles to atoms. The total number of phosphorus atoms in 4.90 mol of copper(II) phosphate is 5.90 x 10²⁴ atoms.

Explanation:

To find the number of phosphorus atoms in 4.90 mol of copper(II) phosphate, first calculate the number of moles of phosphorus atoms in copper(II) phosphate: 2 mol of phosphorus atoms per 1 mol of Cu₃(PO₄)₂. So, 4.90 mol of Cu₃(PO₄)₂ would contain 2 * 4.90 = 9.80 mol of phosphorus atoms. Then, use Avogadro's number to convert moles to atoms: 9.80 mol * 6.022 x 10²³ atoms/mol = 5.90 x 10²⁴ atoms of phosphorus.

6 moles because you start with a balanced equation and with the balanced equation it means that regardless of how many miles of nitrogen gas you have, the reaction will always consume twice as many miles if hydrogen gas.

The chemical compound K₃N is called potassium nitride.

A compound is a substance that is composed of two or more different elements chemically bonded together.

In a compound, the elements lose their individual properties and form new chemical and physical characteristics.

Compounds are represented by chemical formulas, which indicate the types and numbers of atoms present in the compound.

Thus, the compound name of K₃N is potassium nitride. Potassium (K) is a metallic element, and nitrogen (N) is a negatively charged ion. When the three potassium atom combine with the nitrogen atom, it forms the ionic compound of potassium nitride.

Thus, the chemical compound K₃N is called potassium nitride.

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Answer:

IO₂

Explanation:

We have been given the mass percentages of the elements that makes up the compound:

Mass percentage given are:

Iodine = 79.86%

Oxygen = 20.14%

To calculate the empirical formula which is the simplest formula of the compound, we follow these steps:

> Express the mass percentages as the mass of the elements of the compound.

> Find the number of moles by dividing through by the atomic masses

> Divide by the smallest and either approximate to nearest whole number or multiply through by a factor.

> The ratio is the empirical formula of the compound.

Solution:

I O

% of elements 79.86 20.14

Mass (in g) 79.86 20.14

Moles(divide by

Atomic mass) 79.86/127 20.14/16

Moles 0.634 1.259

Dividing by

Smallest 0.634/0.634 1.259/0.634

1 2

The empirical formula is IO₂

To find the empirical formula of a compound, we calculate the moles of each element using their atomic masses. Dividing the moles by the smallest value gives us the ratio of the elements, which represents the empirical formula. For the compound containing 79.86% iodine and 20.14% oxygen, the empirical formula is IO2.

To find the empirical formula, we need to determine the simplest whole-number ratio between the elements in the compound. To do this, we first assume we have 100g of the compound, which allows us to convert the percentages to grams. We can then calculate the moles of each element using their atomic masses. The ratio of moles gives us the empirical formula.

For the given compound that contains 79.86% iodine and 20.14% oxygen by mass:

Assuming 100g of the compound, we have 79.86g of iodine and 20.14g of oxygen. The moles of iodine can be calculated using its atomic mass (126.9 g/mol), which gives us 0.628 moles. The moles of oxygen can be calculated using its atomic mass (16.0 g/mol), which gives us 1.259 moles. Dividing both moles by the smaller value (0.628 moles) gives us the ratio of 1:2. Therefore, the empirical formula for the compound is IO2.

Final answer:

Two tasks that illustrate the importance of precision in measurement are the casual mixing of a cleaning solution, which requires less precision, and a titration procedure in a chemistry lab, where accurate stoichiometry and quantitative chemical analysis are crucial for determining the concentration of the analyte.

Explanation:

When considering differing requirements for measurement in chemical reactions, we can compare two tasks: one where precision is not critical and another where exact stoichiometry and laboratory protocol are essential.

For a task where measurement is not critical, consider mixing a cleaning solution where the exact concentrations are not vital. Small deviations in the amount of detergent or water will not significantly affect the cleaning ability of the solution. This demonstrates a scenario where "good enough" suffices.

On the contrary, precise measurements are indispensable in a task such as a titration in a chemistry lab. In a titration, a known concentration of one solution (titrant) is added to a known volume of another solution (analyte) until the chemical reaction is complete, indicated by a color change or another marker. The volume of titrant used must be measured precisely as it's used to calculate the exact concentration of the analyte. This task necessitates careful quantitative chemical analysis, as any inaccuracy could significantly affect the validity of the results.

Answer:

Molecule and organelles

Explanation:

Answer:

the answer is d :)

Explanation:

Answer:

Its D

Explanation:

Mitochondrial DNA is found Inside the cell, but outside the nucleus in relation to the cell. Option B

Mitochondrial DNA (mtDNA) is a small circular DNA molecule that is found in the mitochondria of eukaryotic cells. Mitochondria are organelles that are responsible for generating energy for the cell. mtDNA is inherited from the mother, and it is not affected by the father's DNA.

mtDNA is different from nuclear DNA in several ways. mtDNA is much smaller than nuclear DNA, and it contains fewer genes. mtDNA is also circular, while nuclear DNA is linear. mtDNA is also more prone to mutation than nuclear DNA.

mtDNA is important for a number of reasons. It is essential for the production of energy in the cell. It is also involved in the apoptosis, or programmed cell death. mtDNA can also be used to diagnose a number of diseases, including mitochondrial disorders and certain types of cancer.

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Answer:

5.8 L.

Explanation:

where, P is the pressure of the gas in atm.

V is the volume of the gas in L.

n is the no. of moles of the gas in mol.

R is the general gas constant,

T is the temperature of the gas in K.

V₁T₂ = V₂T₁

V₁ = 3.8 L, T₁ = - 45.0°C + 273 = 228.0 K.

V₂ = ??? L, T₂ = 75.0°C + 273 = 348.0 K.

∴ V₂ = V₁T₂/T₁ = (3.8 L)(348.0 K)/(228.0 K) = 5.8 L.

Answer:

A Bronsted-Lowry acid like and Arrhenius acid is a compound that breaks down to give an H+ in solution. The only difference is that the solution does not have to be water. ... An Arrhenius base is a molecule that when dissolved in water will break down to yield an OH- or hydroxide in solution.

Explanation:

Answer:

Planet: The object orbits the sun

Not planet: The object is a satellite

Planet: The regions surrounding the object are free from debris

Not Planet: The object is triangular in shape.

Explanation:

A planet is characterized as:

Spheroidal (or at least big enough to be round-ish)

It should orbit the sun (not other planets, so satellites like the moon is not considered as a planet)

It should have no debris, or cleared of debris around its orbit

Although there is now the dwarf planet category, it satisfies almost all charateristics to be considered a planet, except the cleared of debris part.

Answer:

Planet: The object orbits the sun

Not planet: The object is a satellite

Planet: The regions surrounding the object are free from debris

Not Planet: The object is triangular in shape.