A ball has a kinetic energy of 4.50 kJ. If the ball has a mass of 120.0 g, how fast is the ball traveling, in meters per second?

Answer:

no

Explanation:

s ss s s s s s s s s s s s s ss s s s s dkfkf f f f f f f f

The correct answer is option c ΔH = -23.7 kJ/mol and AE = 10.3 kJ/mol

What is catalyst?

A catalyst is a substance that increases the rate of a chemical reaction by lowering the activation energy required for the reaction to occur, without undergoing any permanent chemical change itself. Catalysts work by providing an alternative pathway for the reaction that has a lower activation energy, allowing more reactant molecules to participate in the reaction and increasing the rate of product formation. Catalysts are widely used in industrial processes to increase the efficiency of chemical reactions and reduce the amount of energy required to produce a given amount of product. Some common examples of catalysts include enzymes in biological systems, transition metals such as platinum and palladium used in catalytic converters in cars, and acid or base catalysts used in the production of many chemicals.

Due to this, The activation energy (AE) is the minimum energy required to initiate a chemical reaction, and a catalyst can lower the activation energy required for a reaction to occur. However, a catalyst does not change the overall energy difference between the reactants and products (ΔH) of the reaction. Therefore, the only possible value for ΔH in the presence of a catalyst is still -23.7 kJ/mol.

Of the given answer choices, only ΔH = -23.7 kJ/mol and AE = 10.3 kJ/mol is a possible combination . The activation energy can be lowered to any value less than the original value of 27.9 kJ/mol, but it cannot be increased. Therefore, only the lower value of AE = 10.3 kJ/mol is a possible value in the presence of a catalyst.

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Answer:

b!

Explanation:

Answer:

c - both rock types

Explanation:

when weathered and eroded they can become sediments!

Answer:

15. Velocity = 3 X 10^8

     Distance = 1580 m

time = distance / velocity

t = 1580 / 3 * 10^8

t =  1580 * 10^-8 / 3

t = 158 * 10^-7/3

t = 5.26 * 10^-8 seconds  

16. Converting the distance to 'm'

Given distance (in miles), multiplying by 1.609 to convert to  km and also multiplying by 1000 to convert to 'm'

s= 4.8 * 1.609 * 10^7 * 1000

v = 3 * 10^8

t =  4.8 * 1609  * 10^7 / 3 * 10^8

t = 1.6 * 1609 * 10^-1

t = 2574.4 * 10^ -1

t = 2.5744 * 10^-4 s

17. Mass in 1 tsp of medicine = 5 mL at a density of 25 mg/mL

Mass in 1 tsp of medicine = 5 * 25 = 125 mg

Mass prescribed by the doctor  = 375 mg

Number of table spoons required = Mass prescribed / Mass in 1 tsp

N = 375/125 = 3 table spoons of the medicine

18. Density of medicine = 400g/ 5mL = 80g / mL

Medicine required = 1500 g

Volume of medicine required = Medicine Required / Density of medicine

Volume = 1500 / 80 = 18.75 mL of medicine is required

Hence, the volume of the suspension should be at least 18.75 mL

19. Volume of 10 drops = 1 mL

Volume of 5 drops = 1/2 mL

The faucet is leaking 5 drops or 1/2 mL water per minute

Number of minutes in a day = 60 * 24  = 1440 minutes in a day

Water leaked in 1440 minutes = 1440 * 1/2 = 720

0.720 L (720 mL) Water leaked from the faucet in a day

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Answer:

2-6.5 mol of sodium chloride dissolved in 1.0 mol of water

Explanation:

I'm not sure, do a little research because I may be wrong

Answer:

the answer is asteroids!

Explanation:

Answer:

astroid

Explanation:

becaus

Answer:

they release acids that help break down bare rock to form soil

Answer:

The AH+ for Br2() is 0 kJ/mol.

The AH+ for Hg() is 0 kJ/mol.

The AH; for N261) is 0 kJ/mol.

Explanation:

The statements 1,3,4 and 5 are true.

Enthalpy is defined as a thermodynamic quantity, which can be considered equal to the total heat of the system.

Here,

1) The enthalpy of formation of Br₂ (cr, l) is 0 kJ/mol.

So, the statement is true.

2) The enthalpy of formation of He(l) is not zero.

So, the statement is false.

3) The enthalpy of formation of Hg(l) is 0 kJ/mol.

So, the statement is true.

4) The enthalpy of formation of Cl₂(g) is 0 kJ/mol.

So, the statement is true.

5) The enthalpy of formation of N₂ is 0 kJ/mol.

So, the statement is true.

Hence,

The statements 1,3,4 and 5 are true.

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Answer:

D

Explanation:

it's D because it goes waxing crescent to waxing gibbous

Answer:

try youre best to succsess

Answer:

because iron is magnetic and sand is not

Explanation:

Answer:

(i)The compression factor is 1.12

(ii) The molar volume of the gas is 2.68 L/mol

Since the compression factor is greater than 1, the attractive forces are dominating.

Explanation: Please see the attachments below

Explanation:

it is a parallel circuit.

hope this helps you.

The number of atoms in 1 mole of carbon equals the number of atoms in 1 mole of boron is false because the molar mass of carbon is different from that of boron. Option A is correct.

From the listed option the number of atoms in 1 mole of carbon equals the number of atoms in 1 mole of boron is false because the molar mass of carbon is different from that of boron

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Answer:

\(\boxed {\tt Carbohydrate \ or \ monosaccharides}\)

Explanation:

There are 4 main types of macromolecules: lipids, proteins, carbohydrates, and nucleic acids.

If you are looking for some quick energy, the best choice is carbohydrates. Carbohydrates are the easiest for the body to break down and turn into ATP/energy.

There are also different types of carbohydrates. If you want a more specific answer, monosaccharides is the best answer. They are the simplest sugars. Also, glucose is a monosaccharide, and it shows up directly in the cellular respiration formula. If glucose is consumed, the body doesn't have to break it down before starting respiration.

Answer:

knflnvwlknnffenfkw

Explanation:

Answer:

lol id help u if i could

Explanation:

Volume of the block (V_block) = Length (L) x Width (W) x Height (H)

Volume of the box (V_box) = Length (L) x Width (W) x Height (H)

Ratio of the block to the box:

Volume of the block / Volume of the box = (V_block / V_box) x 100%

Ratio of the number of hits to the number of shots:

Number of hits / 100 shots = (Number of hits / 100) x 100%

Comparing the percentages from step 2 and step 3, we can determine if they are similar.

Conclusion:

a. Based on the findings, we can evaluate whether Rutherford's hypothesis was reasonable.

b. Restate Rutherford's hypothesis: Rutherford proposed that the atom has a small, dense, and positively charged nucleus at its center, with electrons moving around the nucleus in empty space.

c. How the hypothesis was tested: The experiment involved shooting alpha particles at a gold foil to observe their behavior, specifically to see how many alpha particles were deflected and how many passed through.

d. Results supporting the hypothesis: If the percentages from step 2 and step 3 are similar, it indicates that a significant portion of the atom is empty space since most of the alpha particles passed through the foil without being deflected. This supports the nuclear model of the atom, with a small and dense nucleus surrounded by mostly empty space.

e. Possible errors in the experimental procedure: Some errors that might explain discrepancies in the results include experimental setup issues, calibration errors, or variations in the alpha particle source.

f. Confirmation of the nuclear model of the atom: The experiment confirmed that most of the alpha particles passed through the gold foil without significant deflection, implying that atoms have a lot of empty space. This supported Rutherford's hypothesis of a small, positively charged nucleus surrounded by electron orbits, confirming the nuclear model of the atom.

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The stage that this most accurately describes while using the PCR is the initiation of DNA synthesis, also known as the denaturation stage.

In the denaturation stage of Polymerase Chain Reaction (PCR), the double-stranded DNA template is heated to a high temperature to separate the two complementary strands and create single-stranded DNA. The denaturation stage is the first step in the PCR cycle.

In this stage, the heat-stable DNA polymerase denatures the DNA and the primers anneal to the complementary single-stranded template. This marks the beginning of the extension stage, where the DNA polymerase synthesizes new complementary strands along the template DNA.

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The body of avocado fruit can be compared with the cell structure. The skin of the avocado is relatable with the cell membrane. Thus option B is correct.

Cell is the basic unit of life. Cells connect together to forms  tissues and tissues forms organs and a group organs forms an organ system. These different organ systems buildup the whole body.

Cell contains the core called nucleus. Inside the nucleus genetic material DNA, ribosomes, Golgi apparatus, lysosomes etc are located. The function of cell membrane is to protect the cell from damages as the skin do for our body.

In plants unlike animals, their cell is protected by a cell wall apart from cell membrane and various other differences are there in the cell structure of plant cells.

The fluid filled portion of cell is called cytoplasm. The inner content of the avocado fruit is comparable with the cytoplasm and its seed can be considered as the model for nucleus.

Therefore, the avocado's skin represents the cell membrane. Hence, option B is correct.

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One possible reason for cooler air temperatures in Christchurch during El Niño years is the shift in atmospheric circulation patterns.

During El Niño years, Christchurch may experience cooler air temperatures due to several factors associated with the El Niño phenomenon.

El Niño is characterized by the abnormal warming of the surface waters in the eastern tropical Pacific Ocean, which has global climatic implications. While El Niño is primarily associated with changes in oceanic conditions, its effects can extend to atmospheric patterns, leading to altered weather patterns and temperature variations.

One possible reason for cooler air temperatures in Christchurch during El Niño years is the shift in atmospheric circulation patterns. El Niño can disrupt the normal global atmospheric circulation, resulting in changes in the positioning and intensity of weather systems.

This can lead to the advection of cooler air masses from the south or southeast towards Christchurch, resulting in cooler temperatures.

Another factor is the influence of El Niño on regional rainfall patterns. El Niño often leads to drier conditions in the South Island of New Zealand, including Christchurch.

Reduced cloud cover and less moisture in the air can contribute to cooler temperatures as there is less insulation from the sun's radiation and less evaporative cooling. Additionally, the absence of significant rainfall can result in less moisture in the soil, leading to cooler conditions as less energy is used for evaporation.

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The total area that could be covered by this roll of tape is 0.1524 m².

A double-sided tape is a tape that can be stick from both sides. It is used to stick something on a surface. A rectangle is an object that has four sides in which two sides are equal.

If we unroll the tape, we will see that it is a rectangle with dimensions:

length = 6.35 m

width = 1.2 x 10⁻² m

Since the tape has two sides, the total area of the tape is:

A = 2 x (length x width)

A = 2 x 6.35 x 1.2 x 10⁻²

A = 0.1524 m²

Thus, the total area of the tape is 0.1524 m²

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The molarity of the solution is approximately 0.259 M.

To calculate the molarity of a solution, you need to divide the number of moles of solute by the volume of the solution in liters.

In this case, we are given the volume of the solution as 0.340 L and the number of moles of solute (hydrochloric acid) as 0.088 moles.

Molarity = moles of solute/volume of solution (in liters)

Molarity = 0.088 moles / 0.340 L

Molarity ≈ 0.259 M

Therefore, the molarity of the solution is approximately 0.259 M.

The number of moles of solute dissolved in one liter of solution is specified as a measure of a solution's polarity.

Molarity (M) equals molecules of solute divided by the volume of the solution. (in liters)

In chemistry, molarity is an essential unit of measurement because it enables us to compare the concentrations of different solutions and calculate the amount of solute required to prepare a solution of a specific concentration.

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The general form of a neutralization reaction is HF + FrOH → FrF + H₂O

We refer to this as a neutralisation reaction. Only this reaction, which produces NaCl and water as products, is a neutralisation reaction since it involves HCl and NaOH. The resulting response is listed below: NaCl(aq) + H₂O = HCl(aq) + NaOH(aq) (l)

The interaction of H⁺ ions and OH⁻ ions produces water in a neutralisation reaction, which occurs when an acid and a base combine to make water and a salt. The neutralisation of a strong acid and strong base yields a pH of 7.

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4.3 moles of water are produced when 4.3 moles of ammonia are reacted.

What are Moles?

Moles are a unit of measurement used in chemistry to measure the number of atoms or molecules in a given sample of a substance. The mole is defined as the amount of a substance that contains 6.02 x 10^23 of molecules or atoms. This number is known as Avogadro's number.

The reaction for the production of water and nitric oxide from ammonia and oxygen is as follows:

NH3 + O2 → H2O + NO

In order to calculate the number of moles of water produced when 4.3 moles of ammonia are reacted, we need to use the mole ratio between the reactants and the products. The mole ratio for this reaction is 1:1:1, meaning that one mole of ammonia reacts with one mole of oxygen to produce one mole of water and one mole of nitric oxide.

Therefore, 4.3 moles of ammonia will react with 4.3 moles of oxygen to produce 4.3 moles of water and 4.3 moles of nitric oxide.

Hence, 4.3 moles of water are produced when 4.3 moles of ammonia are reacted.

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The relative molecular mass of Br2 is 160.

The relative molecular mass refers to the mass of one mole of a substance. We can obtain the relative molecular mass by looking at the mass spectrum of a compound.

The fact that the he third peak occurs at 160 and is twice  as big as the other two peaks shows that that is the peak that contains the most abundant isotope.

Hence, the relative molecular mass of Br2 = 158 + 162 + 160/3 = 160.

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a) The balanced chemical equation for the reaction is: 2H₂ + O₂ → 2H₂O

b) the number of moles of O₂ required is approximately 1.004 moles.

c)  approximately 45 liters of H₂ and 22.5 liters of O₂ are needed to obtain 45 liters of H₂O.

a) Balancing the chemical equation:

The balanced chemical equation for the reaction is: 2H₂ + O₂ → 2H₂O

b) Calculating the number of moles of the reactants needed to obtain 45 liters of H₂O:

From the balanced equation, we can see that for every 2 moles of H₂O produced, we need 2 moles of H₂ and 1 mole of O₂. Since the stoichiometry is based on moles, we need to convert the given volume of H2O into moles.

To convert volume to moles, we need to use the ideal gas law, PV = nRT. At standard temperature and pressure (STP), the molar volume of an ideal gas is 22.4 liters.

Given that we have 45 liters of H2O, we can calculate the number of moles as follows:

moles of H₂O = (volume of H₂O) / (molar volume at STP)

            = 45 liters / 22.4 liters/mol

            ≈ 2.008 moles of H₂O

Since the stoichiometry of the reaction is 2 moles of H₂O for every 2 moles of H₂, we need an equal number of moles of H₂. Therefore, the number of moles of H₂ required is also approximately 2.008 moles.

For O₂, since the stoichiometry is 1 mole of O₂ for every 2 moles of H₂O, we need half the number of moles of H₂O. Thus, the number of moles of O₂required is approximately 1.004 moles.

c)  the volume of the reactants:

Since the stoichiometry of the balanced equation is 2 moles of H₂for every 1 mole of O₂ and 2 moles of H₂O, we can deduce the volume of the reactants based on their molar volumes at STP.

For 2.008 moles of H₂, the volume can be calculated as follows:

volume of H₂= (moles of H₂) * (molar volume at STP)

            = 2.008 moles * 22.4 liters/mol

            ≈ 45 liters of H₂

For 1.004 moles of O₂, the volume can be calculated similarly:

volume of O₂= (moles of O₂) * (molar volume at STP)

            = 1.004 moles * 22.4 liters/mol

            ≈ 22.5 liters of O₂

Therefore, approximately 45 liters of H₂and 22.5 liters of O₂ are needed to obtain 45 liters of H₂O

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Answer:In the LATER stages of development they would have a spine

Explanation: