what is striking a match an example of? responses an endothermic reaction an endothermic reaction providing activation energy to a physical reaction providing activation energy to a physical reaction providing activation energy to a chemical reaction providing activation energy to a chemical reaction an endothermic process

Answer:

A. The birthrate is higher than the death rate

Explanation:

Answer:

b refraction

Explanation:

i saw on nasa's website lol

Rhizobium bacteria were soil microbes that have the ability to convert dissolved nitrogen from the atmosphere. These root nodules on woody plants contain rhizobium bacteria.

The nitrogen cycle is finished by denitrification, which turns nitrate (NO3-) back into gaseous nitrogen (N2). The driving force behind this procedure is denitrifying microorganisms. These bacteria generate energy from nitrate rather than oxygen, which results in the release of nitrogen gas into the environment.

Azotobacter, Bacillus, Clostridium, or Klebsiella species are a few instances that belong to this category of nitrogen-fixing bacteria. These organisms must acquire their own energy source, as was previously said. Typically, they do this by oxidising organic molecules generated by the other organisms or as a result of decomposition.

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The part of Thomson's model that was not supported by direct evidence is "electrons circled the nucleus like planets around the sun."

This model, is generally known as the planetary model, proposed that electrons moved in fixed orbits around the nucleus of an atom. However, subsequent experiments and discoveries, particularly the results of the Rutherford gold foil experiment, showed that electrons do not move in predictable orbits but rather exist in electron clouds or energy levels surrounding the nucleus.

Therefore, the part of Thomson's model that was not supported by direct evidence is "electrons circled the nucleus like planets around the sun."

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Expressing the answer in exponential form we get 3⁴.

To simplify the expression (3⁷/(3³), we can apply the properties of exponents. When dividing two exponential expressions with the same base, we subtract the exponents.

In this case, we have 3⁷ divided by 3³, which can be simplified as:

3⁽⁷⁻³⁾

3⁴

Therefore, the simplified expression is 3⁴.

To understand why we subtract the exponents when dividing, we can break down the steps.

The expression 3⁷ represents 3 multiplied by itself seven times:

3 × 3 × 3 × 3 × 3 × 3 × 3.

The expression 3³ represents 3 multiplied by itself three times:

3 × 3 × 3.

When dividing these two expressions, we can cancel out common factors by subtracting the exponents:

(3 × 3 × 3 × 3 × 3 × 3 × 3) / (3 × 3 × 3)

This simplifies to:

3 × 3 × 3 × 3

Which is equivalent to 3⁴.

Thus, the answer in exponential form is 3⁴

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Answer:

the potential energy is stored energy so when your going up a roller coaster your storing energy and gaining charger for it to release when you go down which is kinetic energy

Explanation:

hope this is what you were looking for

Each C-H bond is formed by the overlap of an sp³ hybrid orbital from C and a 1s orbital from H.

Thus, the correct answers are sp³ hybrid; 1s.

Eаch C-H bond in methаne, then, cаn be described аs аn overlаp between а hаlf-filled 1s orbitаl in four hydrogen аtoms аnd the lаrger lobe of one of the four hаlf-filled sp³ hybrid orbitаls form а four equivаlent sigmа (σ) bond. This orbitаl overlаp is often described using the notаtion: sp³(C)-1s(H). The formаtion of sp³ hybrid orbitаls successfully explаins the tetrаhedrаl structure of methаne аnd the equivаlency of the four C-H bonds.

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The substance that possesses the larger standard entropy is 1 mol of As4(g) at 300 ∘C, 0.01 atm. As4 has a larger size and more complex structure than P4.

The standard entropy of a substance is a measure of the disorder or randomness of its particles. The higher the entropy, the more disordered the particles are. In this case, we are comparing the standard entropies of P4(g) and As4(g) at the same temperature and pressure.

Standard entropy is a measure of the randomness or disorder of a substance. Generally, larger, more complex molecules have higher standard entropy values than smaller, simpler molecules. As4 is larger and heavier than P4 due to the higher atomic weight of arsenic compared to phosphorus.
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Latent heat under normal conditions occurs when a substance is changing state, and the loss or gain of energy occurs when the temperature of an object is decreasing/increasing.

Latent heat is the quantity of heat which is absorbed or released by a substance under a change of state, such as ice changes into water or water into steam, at constant temperature and pressure. There are three types or phases of the substance, those are: solid, liquid and gaseous.

When heat is exchanged between a hot and cold object, the temperature of the cold object goes on raising because of gaining the energy and the temperature of the hot object goes on reducing because of losing the energy.

This change in temperature continues until the temperature of both the objects reach the same value. In this process, the cold object produces heat energy and the hot object loses heat energy.

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From 39.0 g of the ore, it is possible to obtain approximately 3.28 g of iron.

To determine the mass of iron that can be obtained from the given ore, we need to calculate the amount of iron in the ore based on the percentage composition.

Given;

Mass of the ore = 39.0 g

Percentage of Fe₂O₃ in the ore = 24.0%

Calculate the mass of Fe₂O₃ in the ore;

Mass of Fe₂O₃ = (Percentage of Fe₂O₃ / 100) × Mass of the ore

= (24.0 / 100) × 39.0 g

= 9.36 g

Calculate the molar mass of Fe₂O₃;

Molar mass of Fe₂O₃ = 2 × molar mass of Fe + 3 × molar mass of O

= 2 × 55.845 g/mol + 3 × 16.00 g/mol

= 159.69 g/mol

Calculate the moles of Fe₂O₃;

Moles of Fe₂O₃ = Mass of Fe₂O₃/Molar mass of Fe₂O₃

= 9.36 g / 159.69 g/mol

= 0.0586 mol

Calculate the moles of Fe;

Since the molar ratio between Fe₂O₃ and Fe is 2:2, the moles of Fe are the same as the moles of Fe₂O₃.

Moles of Fe = 0.0586 mol

Calculate the mass of Fe:

Mass of Fe = Moles of Fe × Molar mass of Fe

= 0.0586 mol × 55.845 g/mol

= 3.28 g

Therefore, from 39.0 g of the ore, it is possible to obtain approximately 3.28 g of iron.

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Answer: 340°C

Explanation: To calculate the temperature we have a formula:

                                      q=mcΔT-------------(1)

Given that q=2.50kJ

                  m=22.0g

                   c=0.385J/g°C

                    T1=45°C

ΔT=change in Temperature(T2-T1)

Now calculate the temp substitute these values in  euation(1)

                    2.50= (22.0*0.385)(x-45)

                      2.50 = 8.47(T2-45)

                     2.50=8.47T2-381  

                      T2=340°C

Hence,the final temperature of cu ic 340°C

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Answer:

6.02x10^23 atoms  i think

Explanation:

The main cause is that more light energy from the sun is transferred to the ground of Eastbrook where ostley is, and the energy then move to the air that is above Eastbrook.

Ambient temperature is the air temperature of any object or environment where equipment is stored.

The ambient means relating to the immediate surroundings.

Also sometimes referred to as the ordinary temperature or the baseline temperature, this value is important for system design and thermal analysis.

Difference in air Temperature is caused by combination of water, air and land working side by side.

The water, air and land cause heating and cooling of different areas at different rates.

Even there are differences in temperature in different places base on seasons or time of the year. As you move higher in a place or a mountainous area tend to have high temperature than the ocean.

Therefore The air temperature of ostley is higher than the air temperature of eastbrook.

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Answer:

1387j

Explanation:

i calculated

The number of molecules in 0.25 mole of \(BeCl_2\) is 1.33 x \(10^{25 }\) . Therefore, the correct option is option B.

Everything around us is made up of molecules, which are the basic units of matter. They are essentially composed of two or more atoms connected by chemical bonds. Depending on the molecule, these atoms may be of the same element or distinct elements. In several scientific disciplines, including chemistry, biology, and physics, the study of molecules is essential. Scientists can learn more about the structure and behaviour of molecules and, in turn, learn more about how different substances interact, react, and operate.

0.25 moles x (6.022 x\(10^{23}\) molecules/mol) =  1.33 x \(10^{25 }\) molecules

Therefore, the correct option is option B.

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Answer:

grese

Explanation:

Any liquid could absorb and release thermal energy. However, a refrigerant or a coolant absorbs heat and releases it to any area faster than any ordinary liquid such as water. So to complete the sentence: A refrigerant/cooler is a liquid that absorbs and releases thermal energy

Answer:

Coolant

Explanation:

Every liquid does that but

Coolant does it the fastest

41.7% is the percentage by mass of hydrogen (H) in lithium hydroxide (LiOH). The solution mixture is frequently defined in terms of mass percentage.

The mass percent might be used to denote a degree. Furthermore, it defines the element during a specific mixing. The solution mixture is frequently defined in terms of mass percentage. It represents the amount of solute contained in a mass m of solution.

The quantity of solutes can be stated in terms of mass or moles. We will study the percent by mass formula with numerous solved numerical examples in this post.

Mass percent = (component’s mass ÷ total mass) x 100%

                      = (1/ 23.95)x 100%

                     = 41.7%

Therefore, 41.7% is the percentage by mass of hydrogen (H) in lithium hydroxide (LiOH).

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Down the group lattice energy decreases with increase in atomic radii. It will increase if the magnitude of the charge increases.

A. LiF has greater lattice energy than CsF as \(li^{+}\) has smaller size than \(Cs^{+}\).

B. NaBr has greater lattice energy than NaI as \(Br^{-}\) is smaller in size.

C. BaO has greater lattice energy than \(BaCl_{2}\) due to greater charge on \(O^{2-}\).

D. \(CaSO_{4}\) has greater lattice energy than \(NaSO_{4}\) due to greater charge on \(Ca^{2+}\).

E. \(Na_{2}S\) has greater lattice energy than \(Li_{2} S\) due to large size of \(Na^{+}\) and S.

Lattice energy is the quantity of energy necessary to dissociate the ions in a crystal lattice into their individual gaseous ions. The intensity of interactions between cations and anions in the lattice determines lattice energy.

When one mole of a crystalline ionic compound is formed from its component ions, which are believed to begin be in the gaseous state, the energy change that occurs is known as the lattice energy. It is an evaluation of the cohesive forces holding ionic solids together.

In contrast to the hydration energy, which has distinct anion and cation terms, the lattice energy depends on the sum of the anion and cation radii (r+ + r-). Because of the 1/r2 dependence, the hydration energy is often dominated by the solvation of tiny ions (typically cations).

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Answer: The rate constant is the reaction rate divided by the concentration terms.

Answer:

(i think) it is A difference in 1 unit is a 10X difference in concentration For example; a liquid with pH of 3 is 10X more acidic than a liquid with a pH of 4. Therefore, a liquid with a pH of 3 is stronger.

Explanation:

Planck resolved the flaw by proposing that energy could only be emitted in discrete quantities, called quanta.

Max Planck was a German physicist who was working on the problem of how the electromagnetic radiation emitted by a black body, that was surrounded by a cavity, changed with temperature.

He was trying to explain the shape of the blackbody spectrum. When he observed the radiation from a black body, he noticed that the formula put forward by Raleigh and Jeans was not giving accurate results for the distribution of radiation with wavelength at different temperatures.

He discovered that he could explain the radiation pattern if he modified Raleigh and Jeans's distribution law to produce a simple equation that correctly explained blackbody radiation. The Raleigh-Jeans equation, which describes the electromagnetic radiation emitted by a blackbody, was incorrect for small wavelengths.

Planck resolved the flaw by proposing that energy could only be emitted in discrete quantities, called quanta. Thus, he put forward the idea of quantized energy, which was a radical shift from classical physics.

Planck’s equation for blackbody radiation successfully described the observed distribution of energy with wavelength and temperature.

Hence, Planck resolved the flaw by proposing that energy could only be emitted in discrete quantities, called quanta.

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Answer:

5540

Explanation:

Answer:

5,440

Explanation:

10 deciseconds = 1 seconds

554 seconds = 5,440 seconds

Answer:

with what?

Explanation:

The isopropanol molecule comprises a total of 11 bond three non-H bonds, one hydroxyl group, and one secondary alcohol are present in the lewis structure of isopropanol.

The most popular and commonly used disinfectant in pharmaceutics, hospitals, cleanrooms, and electronics or medical device manufacture is isopropyl alcohol (2-propanol), sometimes known as isopropanol or IPA. The arrangement of atoms and the chemical bonds that hold them together make up a molecule's chemical structure. Isopropyl alcohol quickly kills bacteria, fungi, and viruses, especially in concentrations between 60% and 90% alcohol and 10–40% filtered water. Alcohol concentrations below 50% are no longer very useful for disinfection. An empty or full bonding, antibonding, or lone pair orbital can function as a donor, as can a filled bonding or lone pair orbital.

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First and last statements are true while rest of the statements are false and the reasons are given below.

20. True - Organic chemistry studies the structure, properties, synthesis and reactivity of chemical compounds foed mainly by carbon and hydrogen, which may contain other elements, generally in small amounts such as oxygen, sulfur, nitrogen, halogens, phosphorus, silicon.

21. False - Every reaction requires the gain or the release of energy for the formation or breaking of the bonds of the reactants.

22. False - The entropy of the products is greater than that of the reactants.

23. False - A reaction where the change in enthalpy is greater than the change in entropy can be classified as non-spontaneous.

24. False - The energy of intermediates is lesser than that of reactants and products.

25. True - The breaking of the water molecule into hydrogen and oxygen is an endothermic process, that is, energy is required to break the bonds of oxygen with hydrogen. One way to achieve this breakdown, and the formation of the products, is by increasing the temperature (example: 100 °C).

Organic chemistry is a branch of chemistry that studies the structure, properties, synthesis, and reactivity of organic compounds. It mainly deals with compounds containing carbon and hydrogen atoms. These organic compounds can also contain other elements such as nitrogen, sulfur, oxygen, halogens, phosphorus, silicon, and others.

Every reaction requires the gain or release of energy for the formation or breaking of the bonds of the reactants. The energy required for bond breaking is always more significant than that released during bond formation, and the difference between the two is known as the change in enthalpy.

The entropy is the measure of disorder or randomness of a system. In an exothermic reaction, the entropy of the products is greater than the entropy of the reactants. The change in entropy is related to the dispersal of matter and energy within a system and its surroundings.

A reaction where the change in enthalpy is greater than the change in entropy can be classified as non-spontaneous. This is because such a reaction requires energy to occur and is not spontaneous on its own.The energy of intermediates is lesser than that of reactants and products.

The intermediates are reactive species that exist in between the reactants and the products and are unstable in nature.The breaking of the water molecule into hydrogen and oxygen is an endothermic process, that is, energy is required to break the bonds of oxygen with hydrogen. One way to achieve this breakdown, and the formation of the products, is by increasing the temperature.

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Answer:

The answer is - C. Sweat, tears, skin, and mucus membranes.

Explanation:

"Hypotonic solution," refers to a solution with the highest water concentration due to its lower solute concentration compared to the other options, leading to water influx into cells.

A hypotonic solution would be most likely to have the highest water concentration. In a hypotonic solution, the solute concentration is lower than that inside the cell or compared to another solution. As a result, water tends to move into the cell or the solution to equalize the concentration.

When a cell is placed in a hypotonic solution, water molecules will move into the cell through the process of osmosis. This influx of water increases the water concentration inside the cell, leading to cell swelling or even bursting in extreme cases.

Compared to hypertonic and isotonic solutions, a hypotonic solution has a lower solute concentration, allowing for a higher concentration of water molecules. This results in a higher water concentration in the solution. It's important to note that the concept of tonicity is related to the relative solute concentrations between two solutions and their effect on cell osmosis. In this case, a hypotonic solution is characterized by a higher water concentration compared to the other options.

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The amount of heat evolved by a reaction is, 53.84 kJ

Heat released by the reaction = Heat absorbed by the calorimeter + Heat absorbed by the water

q = [q1 + q2]

q = [c1× ∆T]+[m2×c2×∆T]

where,

q = heat released by the reaction

q1 = heat absorbed by the calorimeter

q2 = heat absorbed by the water

c1 = specific heat of calorimeter = 600 j/g°c

c2 = specific heat of water = 4.184 j/g°c

m2 = mass of water = 500 g

∆T = change in temperature = 20°c

Now put all the given values in the above formula, we get:

q = (600×20) + (500×4.184×20)

q = 12000 + 41840

q = 53840 J

q = 53.84 kJ

Therefore, the amount of heat evolved by a reaction is, 53.84 kJ

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