Mrs. Rushing fills a balloon with hydrogen gas to demonstrate its ability to burn. Which combination could she
use to produce the hydrogen she needs?

NaOH and oil

Zn and KOH

H2SO, and CaCO

0 Mg and HCI

I’ll mark your reply if the answer was correct.

Limiting factor- Food, Pollution, Predators.

Outcome variable (dependent variable): Cricket Frog (population)

Control group: Cricket Frogs in the Florida Everglades without changes in or manipulation of the population.

Answer:a mouse

Explanation:

Answer: a mouse

Explanation:

Atomic orbitals are the areas to the left and right of the dashed lines. The possible molecular orbitals that they can form are indicated by the dashed lines.

Normally, in diatomic molecular orbitals, the atomic orbitals with the closest energy level can overlap with each other and form molecular orbitals. Therefore, the atomic orbitals generally tend to overlap one by one from the lowest potential energy to the highest potential energy. For example, in a homonuclear diatomic molecule, which means that both atoms are the same element, the same orbitals will overlap together and form molecular orbitals.

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Answer:

C. CCl4

Explanation:

Covalent bonding involves the sharing of electrons between two or more atoms (mostly non-metals)

The other 3 are ionic bonds (metal and non-metal)

Answer:

Mouth

Esophagus

Stomach

The small intestine

Colon (large intestine)

Rectum

(i) The vehicle outputs approximately 11.58 kg of CO₂ per week. (ii) The Biofuel Obligation Scheme in Ireland is implemented by requiring fuel suppliers.

To calculate the amount of CO₂ output per week, we need to determine the amount of fuel used and then use the given combustion equation to find the ratio of CO₂ produced per unit of fuel.

Given;

Average fuel efficiency: 7.5 km per litre

Distance traveled per week: 300 km

Mass of fuel per litre: 0.75 kg

First, we calculate the total fuel used per week;

Fuel used = Distance traveled / Fuel efficiency

= 300 km / 7.5 km per litre

= 40 litres

Next, we find the mass of fuel used per week:

Mass of fuel used = Fuel used × Mass of fuel per litre

= 40 litres × 0.75 kg per litre

= 30 kg

Using the combustion equation, we know that 2 moles of C₈H₁₈ produce 16 moles of CO₂. Therefore, we can calculate the moles of CO₂ produced from the given mass of fuel;

Moles of CO₂ produced = Moles of C8H18 × (16 moles of CO₂ / 2 moles of C₈H₁₈)

= (30 kg / (114 g/mole)) × (16 moles of CO₂ / 2 moles of C₈H₁₈)

= (30,000 g / 114 g/mole) × (16 moles of CO₂ / 2 moles of C₈H₁₈)

= 263.16 moles of CO₂

Finally, we convert the moles of CO₂ to kilograms;

Mass of CO₂ produced = Moles of CO₂ produced × Molar mass of CO₂

= 263.16 moles × (44 g/mole)

= 11,579.04 g

= 11.58 kg (rounded to two decimal places)

Therefore, the vehicle outputs approximately 11.58 kg of CO₂ per week.

The Biofuel Obligation Scheme in Ireland is implemented by requiring fuel suppliers to include a certain percentage of biofuels in their overall fuel sales, thereby reducing the carbon footprint by promoting the use of renewable and lower-carbon-emitting fuels.

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The chemical pathway appears to be important both in some types of psychotic behavior and in the reinforcing properties of various drugs is  Mesolimbic dopamine pathway.

The reinforcing and addictive qualities of substances like nicotine are greatly influenced by the mesolimbic dopamine system.

Dopamine serves a variety of functions and is both a neurotransmitter and a hormone.

These mesolimbic pathways aid in the distribution of dopamine throughout the body. The nucleus accumbens receives dopamine from the ventral tegmental region via the mesolimbic dopamine pathways.

Dopamine produces a sense of reward and pleasure in the nucleus accumbens.

Dopamine flows from the ventral tegmental region to the nucleus accumbens anytime there is a sense of rewarding or pleasurable stimuli. Dopamine provides a sense of positive feeling, which leads to addictive behavior ( ie, drugs).

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The balance chemical reaction is as below:

4Fe (s) + 3O₂ (g) ⇒ 2Fe₂O₃ (s)

The term balanced chemical equation is defined when the number of the atoms involved in the reactants side is exactly equal to the number of atoms in the products side.

The most important thing about balancing chemical equations is to satisfy the law of conservation of mass, This states that  “the total mass of the products is exactly equal to the total mass of all the reactants”

Thus, The balance chemical reaction is as below:

4Fe (s) + 3O₂ (g) ⇒ 2Fe₂O₃ (s)

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Answer:

the energy levels and orbitals the electrons are in

Explanation:

i just took the test :)

The energy levels and orbitals the electrons are in. Hence, option D is correct.

An atom contains a central nucleus surrounded by one or more electrons.

The quantum numbers of electrons represent the probable distance of the electron from the nucleus. It refers to the size of the orbital and the energy level an electron is placed in.

Hence, option D is correct.

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The ph at the equivalence point in the titration of 100 ml of 0.10 m HCN with 0.10 m NaOH is 11.04.

To ascertain the concentration of an identified analyte, titration is a typical laboratory technique for quantitative chemical analysis. A standard solution with a known concentration and volume is prepared as the reagent, also known as the titrant or titrator.

The food business uses titration extensively as an analytical method. It enables food producers to estimate the concentration of a reactant in a sample. For instance, it can be used to determine a food's salt or sugar content or the amount of vitamin C or E, which affects the color of the product.

\(HCN + OH^{-}\) →\(H_{2}O + CN^{-}\)

At the equivalence point, 10 mmol of cyanide ions are held in 200 mL of solution.

[\(CN^{-}\)] = 10 mmol/200 mL = 0,05 M

Kb = \(\frac{ 1.0E^{-14} }{4.9E^{-10} }\)

Kb = 2.0E-5 corresponding to \(CN^{-}\) + \(H_{2}O\)= HCN + \(OH^{-}\)

Kb =\(\frac{[HCN][OH^{-}}{CN^{-}}\)

y=0.0011 M =[\(OH^{-}\)]

pOH = 2.96

pH = 14.00 - pOH = 11.04

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the energy emitted by photon was 0.300564×10-18 J

what is photon?

The term photon, which means "light" in Ancient Greek, refers to a basic particle that is a quantum of the electromagnetic field, which includes electromagnetic radiation like light and radio waves. It also serves as the force carrier for the electromagnetic force. Considering that photons have no mass, they always travel at the speed of light in a vacuum, which is 299792458 m/s (or 186,282 mi/s).

formula was

ΔE=R(1n2f−1n2i)

R=the Rydberg constant, 2.178×10-18 J

For a transition from n=3 to n=2, we get

ΔE=2.178×10-18 J(1/22−1/32)

=2.178×10-18 J(1/4−1/9)

=2.178×10-18 J× 9 – 4/9×4

=2.178×10-18 J× 5/36

=0.300564×10-18 J

hence the energy emitted by the photon was 0.00564x10-18J

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Answer:

it is D

Explanation

Electrons are a type of subatomic particle with a negative charge. ... Protons and neutrons have approximately the same mass, but they are both much more massive than electrons (approximately 2,000 times as massive as an electron).

Answer:

Crystals form in nature when molecules gather to stabilize when liquid starts to cool and harden. This process is called crystallization and can happen when magma hardens or when water evaporates from a natural mixture too. Many crystals start small but as more atoms join and create a uniform and repetitive pattern, the crystal grows. This is how crystals are formed in nature.

Explanation:

The product that is produced during fermentation reactions (lactic acid fermentation or ethanol fermentation) and the electron transport chain is NAD+.

Throughout the process anaerobic glycolysis the two molecules of NADH that are bring back to their oxidized form NAD+ in the method of the fermentation. So the reclamation of glycolysis-related NADH is filled up. The method of aerobic respiration produces six molecules of NADH that being bring back into NAD+ form throughout the process of oxidative phosphorylation.

Fermentation abide by the glycolysis in the absenteeism of oxygen. Alcoholic fermentation generates ethanol, carbon dioxide, and NAD+. Lactic acid fermentation generates lactic acid (lactate) and NAD+.

Hence, in the conclusion NAD+ will be produced.

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it's the 1 and 3 I think it's that hopefully it's right

Answer:

Metallic bonding  

Metals have low ionization energies. Therefore, their valence electrons are easily delocalized (attracted to the neighbouring metal atoms). These delocalized electrons are then not associated with a specific metal atom.  Since the electrons are “free”, the metal atoms have become cations, and the electrons are free to move throughout the whole crystalline structure.

We say that a metal consists of an array of cations immersed in a sea of electrons. The electrons act as a “glue” holding the cations together.

Metallic bonds are the attractive forces between the metal cations and the sea of electrons.

(Hope this helps) Sky

Answer:

i dont knowi dont know and thank you for the points

Explanation:

1st structure- 1-chloro-3-ethylbenzene (meta-ethyl chlorobenzene)

2nd structure- 2-nitrobenzoic acid (ortho-nitrobenzoic acid)

What is IUPAC's name?

An chemical nomenclature, the IUPAC nomenclature of organic chemistry is a method of naming organic chemical compounds as recommended by the International Union of Pure and Applied Chemistry. It is published in the Nomenclature of Organic Chemistry.

Hence, the 1st structure- 1-chloro-3-ethylbenzene (meta-ethyl chlorobenzene)

2nd structure- 2-nitrobenzoic acid (ortho-nitrobenzoic acid)

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Answer:

They used atomic number instead of atomic mass to organize the elements. From an element's location in the periodic table, you can predict: ... The elements have similar properties.

The main purpose of following the course of a reaction by TLC is to determine if all the starting material is converted to the product. Thin-layer chromatography (TLC) is a simple chromatographic method that helps to separate and purify the compounds from a mixture.

It is used for the qualitative analysis of organic compounds by following the course of a reaction by TLC.TLC is a quick and easy method for checking if the starting material has been completely converted to the product. The product and starting material can be separated by TLC if the product has different properties from the starting material. The result of the TLC analysis can be used to determine if the reaction is complete by comparing the Rf values of the starting material and the product. The product has a different Rf value than the starting material, making it easier to track the progress of the reaction. In conclusion, the main purpose of following the course of a reaction by TLC is to determine if all the starting material is converted to the product.

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Answer: 4 moles of ammonia.

Explanation:

So you’re trying to make NH 3

 from N 2

 and H 2

.

In chemistry, that is denoted by the following reaction:

N 2

 + H 2

 → NH 3

But you can’t create or destroy atoms, so you need to have the same number of both of them on the same side.

You have 2 hydrogen atoms on the left and 3 on the right. How can we make both amounts the same? If we try to make 2 NH 3

 molecules instead of 1, we have 6 hydrogen atoms in total. 6/2 =3 H 2

 . This also means we have 2 nitrogen atoms, so we have balanced the equation.

N 2

 + 3 H 2

 → 2 NH 3

Now comes the fun part. Those numbers in front of the different formulas are the amount of moles that go into the equation. You need 1 mole of nitrogen and 3 moles of hydrogen to make 2 moles of ammonia. If we multiply these numbers by 2, we can also say you need 2 moles of nitrogen and 6 moles of hydrogen to make 4 moles of ammonia. (And you’d have 1 mole of nitrogen left over.)

The degradation of odd-chain fatty acids can boost the activity of the citric acid cycle is increase in the concentration of the cycle intermediates will causes the increase in the activity in the citric acid cycle.

The building blocks of the fats in the body and the food we consumed are called the fatty acids. The molecule  that is the  triglyceride is created when the three fatty acid molecules will linked together.

The Succinyl-CoA is the citric acid cycle intermediate. The Acetyl-CoA is the substrate in the citric acid cycle. This result, in the activity of the cycle that can be boosted by increasing the concentration of the cycle intermediates, in the case, succinyl-CoA and the acetyl-CoA.

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Answer:

SbCl5

Antimony pentachloride

Antimony pentachloride is a chemical compound with the formula SbCl5.

- wikipedia

The maximum hardness obtained in a piece of steel is primarily determined by its carbon content. Steel is an alloy of iron and carbon, and the carbon atoms play a crucial role in influencing the material's hardness.

When steel is heated and then rapidly cooled in a process called quenching, the carbon atoms become trapped within the iron lattice structure. This rapid cooling prevents the carbon atoms from diffusing and forming larger crystals, resulting in a harder microstructure.

The higher the carbon content in the steel, the greater the potential for hardness. Steels with higher carbon concentrations can form more carbide particles, which contribute to increased hardness.

However, it's important to note that other factors can also affect the hardness of steel, such as the presence of other alloying elements (e.g., chromium, manganese) and the specific heat treatment processes employed. These factors can influence the formation of different microstructures and phases, affecting the steel's overall hardness.

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Answer:

A. It causes rocks to change color

Explanation:

Weathering can be defined as the gradual decomposition of rock. This means, rocks are broken into pieces or sediments through the process of weathering.

There are two types of weathering process:

1. Physical weathering also known as mechanical weathering. This is the breakdown of rocks into smaller pieces without changing the composition of the rock. Physical weathering is caused by the action of ice, wind, plant growth.

2. Chemical weathering: Here, the rocks changes not just in size of pieces but in its composition. This is when other minerals are applied on the rock in other to dissolve it.

There must have been 0.10mol of \(C_{2} H_{2} O\) in the container at the beginning.

 \(C_{2} H_{2} O\) + \(2O_{2}\) = \(2CO_{2}\) + \(H_{2} O\)

The above reaction makes it quite evident that 1 mol of \(C_{2} H_{2} O\) combines to create 2 mol of \(CO_{2}\) and \(O_{2}\) is given in excess that \(C_{2} H_{2} O\) alone controls a product's formation. Therefore, here, O is an excess reactant and \(C_{2} H_{2} O\) is a limiting reactant.

It takes 6 times as much \(C_{2} H_{2} O\) to produce 1 mol of \(CO_{2}\) from 0.05 mol of \(C_{2} H_{2} O\).

Now, 0.6 divided by 6 mol of reactant is required for 0.60 moles of \(CO_{2}\)to produce, which translates to

moles of \(C_{2} H_{2} O\) = 0.6/6 = 0.1 mol .

Therefore, \(C_{2} H_{2} O\) must have been present in the container in an initial concentration of 0.10mol.

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At a particular temperature, the solubility of He in water is 0.060 M when the partial pressure is 0.90 atm. 2.27 atm is the partial pressure of Kr would give a solubility of 0.150 M.

Solution:

The solubility of gas is directly proportional to partial pressure. It is expressed as:

S = \(K_ h \times P _g_a_s\)

where, S = Solubility of gas

\(K_h\) = Henry's Law constant

\(P_g_a_s\) = Partial pressure of gas

Now, put the values in above expression we get

0.060M = \(K_h\) × 0.9 atm

   \(K_h\) =  = 0.066 M/atm

Now we have to find the partial pressure of He

0.150 M = 0.066 M/atm × \(P_g_a_s\)

\(P_g_a_s\) = 2.27 atm

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When a car driver puts their foot on the brake pedal, the brake fluid is pushed down a narrow tube connected to the brake. Since brake fluid is hard to squash, the brakes are put on immediately the scientific term for squash is compressibility.

The scientific term for squash is "compressibility". In the case of brake fluid, it has very low compressibility, which means that it cannot be easily compressed or squashed, resulting in immediate and effective brake application when pressure is applied to the brake pedal.

The term "compressibility" describes how much a particular volume of matter shrinks under pressure. A solid or a liquid under pressure essentially maintains its volume. The solid or liquid's constituent atoms, ions, or molecules are in close proximity to one another.

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