For something to combust, it must have ____________.
A. Carbon dioxide
B. Oxygen
C. Water
D. Nitrogen

When a silver nitrate solution is mixed with a sodium chloride solution, a precipitation reaction occurs, resulting in the formation of solid silver chloride (AgCl) and aqueous sodium nitrate (NaNO3). So, the correct options are A. sodium nitrate and C. silver chloride.

The balanced chemical equation for the reaction is:

AgNO3(aq) + NaCl(aq) → AgCl(s) + NaNO3(aq)

Therefore, the precipitates formed in this reaction are silver chloride (AgCl), which is insoluble in water, and it appears as a white solid, and sodium nitrate (NaNO3), which remains in the aqueous solution.

Sodium chloride (NaCl) and silver nitrate (AgNO3) are both soluble in water and will remain in the solution in their ionic form as aqueous ions (Na+ and Cl- for NaCl and Ag+ and NO3- for AgNO3).

In summary, the precipitates formed in the reaction between silver nitrate and sodium chloride are silver chloride and sodium nitrate, while sodium chloride and silver nitrate remain in the solution as ionic compounds. So, the correct options are A. sodium nitrate and C. silver chloride.

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Answer:

C

Explanation:

Because i just had to do this on my assignment and got 100

Answer:

hey , its option c because in chemical reaction colour + evolution of gas takes place + temp. + precipitation. but also light can come in the case of chemical reaction.

Answer:

I'm the constant, volume and shape are both definite. Constant means that those characters are not changeable in the same common volume and shape or both.

When propanal reacts with methylmagnesium bromide (CH₃MgBr) followed by the addition of dilute acid, the major organic product formed is 3-hydroxypropanal.

On the other hand, when propanone reacts with methylmagnesium bromide (CH₃MgBr) followed by the addition of dilute acid, the major organic product formed is 3-hydroxy-2-methylpropanal.

A dilute acid is a solution that contains a relatively small amount of acid dissolved in a solvent, usually water. Dilute acids are commonly used in various chemical and industrial processes, as well as in the laboratory.

In a dilute acid solution, the concentration of acid is low enough that it is not considered to be a concentrated or strong acid. The strength of an acid refers to its ability to donate protons (H+) to a solution, and is related to the concentration of the acid in the solution. Dilute acids typically have a lower pH value and are less reactive than concentrated acids.

Common examples of dilute acids include dilute hydrochloric acid (HCl), dilute sulfuric acid (H2SO4), and dilute nitric acid (HNO3). These acids are used in a variety of applications, such as cleaning and etching metals, producing fertilizers, and in the production of pharmaceuticals.

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The percentage by mass of Fe²⁺ in the tablet is 3.4%

The question is asking to calculate the percentage by mass of Fe²⁺ in the tablet. To solve this question, use the following formula:

mass of Fe²⁺ = (volume of titrant x molarity of titrant x valency of titrant) ÷ (volume of solution x 1000)

We are given the following information:

Using the formula above, we can calculate the mass of Fe²⁺ as follows:

mass of Fe²⁺ = (32.5 cm³ x 0.00160 moldm⁻³ x 6+) ÷ (250 cm³ x 1000)

mass of Fe²⁺ = 0.0320 g

To calculate the percentage by mass of Fe²⁺ in the tablet, divide the mass of Fe²⁺ (0.0320 g) by the tablet weight (0.940 g) and multiply by 100:

Percentage by mass of Fe²⁺ = (0.0320 g ÷ 0.940 g) x 100

Percentage by mass of Fe²⁺ = 3.4%

Therefore, the percentage by mass of Fe²⁺ in the tablet is 3.4%.

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We can expect that the process of "diffusion" will ensure that the sugar molecules are evenly distributed throughout the water.

After a cup of sugar is dumped into a gallon of hot water, we can expect that the process of "diffusion" will ensure that the sugar molecules are evenly distributed throughout the water. In diffusion, molecules move from an area of higher concentration to an area of lower concentration.

In this case, sugar molecules spread out within the hot water until they are uniformly distributed.

This process usually takes place more quickly in hot water due to the increased movement of water molecules, which helps the sugar dissolve and disperse faster.

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Answer:

oxidized. because oxidized number of Fe change from 0 to +3

Answer:

5.0*10^23 atoms

Explanation:

1 mole c atoms=12g=6.02*10^23 atoms

12g c contain 6.02*10^23 atoms

10g c contain = (6.02 *10^23 atoms ÷ 12g)*10g

5.0*10^23 atoms

When a gas expands, the sign of w is negative.

When a gas contracts, the sign of w is positive.

The sign of w for the process of boiling water is negative.

In the first law of thermodynamics, the energy of the universe is constant. A system can change its internal energy through a flow of work, heat, or both, and therefore the total amount of heat energy and the total amount of work energy that goes in or out must be equal to the total internal energy change of the system (ΔE).

                                         ∆E = q + w

        ΔE = change in internal energy

         q =  heat

         w = work energy

When we add a property to the system from the surroundings, the sign is positive and when the system adds a property to the surroundings the sign is negative.

To boil water, heat must be added so that q is positive. The molar volume of a gas is huge compared to the molar volume of a liquid. As a liquid converts to a gas, the system will expand its volume, performing work on the surroundings; w is negative.

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Answer:

Explanation:

The Hawaiian Islands were literally created from lots of volcanoes—they're a trail of volcanic eruptions. In the case of the Hawaiian Islands, the Pacific Plate is continually moving to the northwest over the Hawaiian hot spot. This movement caused the Hawaiian chain of islands to form.

Answer:

40. B

41. B

Explanation:

Copper is a good insulator and conducts electricity.

Answer:

use wire nettings

Explanation:

and cages

Answer:

0.75 M

Explanation:

M1 = 0.15 M

V1 = 125 mL or 0.125 L

M2 = Y

V2 = 25 mL or 0.025 L

0.15 M x 0.125 mL = Y x 0.025 L

Y =  0.15 M x 0.125 mL / 0.025 L

Cancel out the mL

Y = 0.01875M /  0.025 L

Y = 0.75M

Answer:

0.125 M

Explanation:

M₁V₁ = M₂V₂

125 mL / 1000 = 0.125 L = V₁

25 + 125 = 150 mL / 1000 = 0.150 L = V₂

0.15 M = M₁

M₁ × V₁ / V₂ = M₂

(0.15) × (0.125) / (0.150) = 0.125 M

0.125 M is the answer

Answer:

Calcium, potassium, aluminum, chlorine, bromine

Explanation:

I do not know all of them, but here are some.

Answer:

This took forever T-T

Explanation:

1. The condition of the soil has a big impact on the environment. Good soil helps plants grow, supports different kinds of life, and prevents erosion. It also keeps nutrients in balance and affects the quality of water and air. If the soil is unhealthy or polluted, it can harm plants, animals, and the overall ecosystem.

2. The dodo bird is an example of a species that no longer exists. It used to live on an island called Mauritius. Sadly, people hunted the dodo bird for food and destroyed its habitat. They also introduced other animals that harmed the dodo bird's population. Because of these reasons, the dodo bird became extinct. This affected the environment because the dodo bird played a role in spreading seeds and helping plants grow.

3. The Sumatran orangutan is a species in danger of disappearing. Its biggest threats are losing its home due to forests being cut down for palm oil, illegal hunting, and being taken as pets. People are working to protect the orangutans by preserving their habitat, rescuing and rehabilitating them, and educating communities about their importance.

4. Central Park in New York City is a natural area created in 1857. It was made for people to enjoy nature in the middle of the city. People can do many outdoor activities there like walking, picnicking, and playing sports. The park is also home to various birds and animals, which adds to the city's biodiversity.

5. When a certain environment, like a forest or a desert, is damaged or in danger, it has a big impact on the whole ecosystem. Many different plants and animals depend on each other in these environments. If something harms or destroys their homes, it can lead to the loss of species, disruption of food chains, and less diversity. It can also affect important processes like water and carbon cycles, and even influence the climate. People who rely on these environments for resources and livelihoods are also affected. That's why it's important to protect and take care of these natural areas.

Answer: pretty sure that would be chemical

Explanation:

Answer:it is a chemical property

Explanation:

Flammability is a chemical property that result on the creation of new substance

When there are more moles of gaseous products than gaseous reactants in the reaction at equilibrium, it is demonstrated that K\(c\) is smaller than K\(p\).

The relationship between the equilibrium constant (K) for partial pressure (K\(p\)) and the equilibrium constant for concentration (K\(c\)) is as follows,

K\(c\) = K\(p\) (RT)⁻Δn

K  \(p\)= K\(c\) (RT)⁻Δₙ

and here Δₙ = (product - reactant), Δₙ > 0

Therefore, K  \(p\) > K\(c\)

Therefore, it proves that K\(c\) is less than K\(p\) if the reaction has more moles of gaseous products than gaseous reactants at equilibrium.

What is the Equilibrium Constant?

The equilibrium constant of a chemical reaction is found at chemical equilibrium, the state in which, given enough time, a dynamic chemical system approaches and its composition shows no further tendency to change. is equal to the value of the reaction quotient of For a given set of reaction conditions, the equilibrium constants are independent of the initial analytical concentrations of reactant and product species in the mixture. Therefore, given a known equilibrium constant, the composition of a system in equilibrium can be determined from its initial composition. However, the value of the equilibrium constant can be affected by parameters that affect the reaction, such as temperature, solvent, and ionic strength.

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Answer:

Diffusion is driven by differences in concentration. When chemical substances such as perfume are let loose in a room, their particles mix with the particles of air. Diffusion in gases is quick because the particles in a gas move quickly. It happens even faster in hot gases because the particles of gas move faster.

Answer:

The horizontal rows in the periodic table are periods, while the vertical rows are called groups.

Explanation:

To determine the volume of hydrogen gas produced when 45.5 grams of methane (CH4) reacts with plenty of steam, we first need to write the balanced chemical equation for the reaction.

When steam (water vapor) is involved in a chemical reaction, it is important to consider its gaseous form, which is water vapor (H2O) in this case. Therefore, the balanced chemical equation for the reaction between methane and steam. From the equation, we can see that 1 mole of methane reacts with 2 moles of water (steam) to produce 4 moles of hydrogen gas.To calculate the volume of hydrogen gas produced, we need to determine the number of moles of methane and then use the stoichiometric ratio to find the moles of hydrogen gas.

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D20 exchange is a method used to determine the presence of certain protons in a molecule.

It involves exchanging a deuterium (D) nucleus for a hydrogen (H) nucleus in the molecule. By measuring the amount of exchange that occurs, it is possible to determine which protons are present and how strongly they are bound.

The formula for D20 exchange is:

[D]/[H] = k1/k2

Where [D] is the concentration of deuterium in the molecule, [H] is the concentration of hydrogen in the molecule, and k1 and k2 are the rate constants of the exchange reaction.

In this case, the presence of OH and NH2 protons is confirmed by D20 exchange, since both of these protons are known to exchange deuterium nuclei. CH protons, on the other hand, do not exchange deuterium nuclei, so their presence cannot be confirmed by this method. The exchange rate for OH and NH2 protons is generally much higher than that of CH protons, which makes them easier to detect.

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The color of light emitted by an excited atom is determined by the difference in energy levels between the excited state and the lower energy state the electron returns to.

The color of light is determined by the location of an electron in an excited atom through the following process:

1. When an atom absorbs energy, its electrons get excited and jump to higher energy levels.
2. These excited electrons are unstable and will eventually return to their original lower energy levels.
3. As the electron transitions back to its lower energy level, it releases energy in the form of a photon.
4. The energy of the emitted photon corresponds to the difference between the two energy levels the electron transitioned between.
5. This energy determines the wavelength and, consequently, the color of the light emitted by the atom.
6. Shorter wavelengths (higher energy) correspond to colors in the violet-blue range, while longer wavelengths (lower energy) correspond to colors in the red-orange range.

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Answer:

Warm equatorial air rises higher into the atmosphere and migrates toward the poles. This is a low-pressure system. At the same time, cooler, denser air moves over Earth's surface toward the Equator to replace the heated air. ... This happens because Earth's rotation generates what is known as the Coriolis effect

Acetaldehyde and benzaldehyde reactants would give the possible aldol condensation product shown. Aldol condensation is a reaction between aldehydes or ketones with α-hydrogen atoms.

The reaction results in an α,β-unsaturated carbonyl compound, aldol product. Aldol condensation is a significant reaction in organic chemistry, which can happen under both acidic and basic conditions. This reaction happens when the alpha carbon of one aldehyde or ketone attacks the carbonyl carbon of another aldehyde or ketone. It's called a condensation reaction because it produces a new molecule and eliminates water as a side product.

Each aldehyde or ketone has a hydrogen atom next to the carbonyl group. During the aldol condensation, an alpha hydrogen from one molecule is removed and an alpha carbon-carbon bond is formed by the nucleophilic addition of the enolate ion to the carbonyl carbon of another molecule of aldehyde or ketone.In this case, the reactants which are Acetaldehyde and benzaldehyde produce the following possible aldol condensation product.

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Tap water has a larger range of pH values and thus more dispersion in pH compared to bottled water. This means that the pH of tap water is more variable than the pH of bottled water.

To determine which type of water has more dispersion in pH, we need to calculate the range of pH values for each type of water. The range is the difference between the highest and lowest values in a set of data and is a measure of dispersion.

Let's assume that the pH data for the bottled water and tap water are as follows:

Bottled water: 6.0, 6.2, 6.5, 6.8, 7.0, 7.2, 7.5

Tap water: 6.5, 7.0, 7.5, 8.0, 8.5, 9.0

To find the range for each set of data, we simply subtract the lowest pH value from the highest pH value:

Range for bottled water = 7.5 - 6.0 = 1.5

Range for tap water = 9.0 - 6.5 = 2.5

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Answer:

Nitrogen has 7 protons and 7 electrons and 7 neutrons.

Explanation:

The atomic number of an element is the number of electrons and protons they have. The atomic mass - the atomic number of an element equals the number of nuetrons. The atomic mass of nitrogen is 14 and the atomic number is 7 therefore we have to subract, 14-7=7.

Because of aromaticity, benzene is significantly more stable than one would expect for a compound with three alkenes in a ring.

Aromaticity refers to a property of certain cyclic organic compounds that possess a ring of atoms with delocalized electrons, which creates a particularly stable molecular structure. In benzene, the six carbon atoms form a planar, hexagonal ring with three double bonds, which creates a system of six pi electrons that are delocalized throughout the ring. This arrangement of electrons creates a particularly stable structure that is resistant to addition reactions and other forms of chemical reactivity. Additionally, the delocalization of electrons in the pi system creates a uniform distribution of electron density around the ring, which results in a lack of dipole moment and non-polar nature of the molecule. Overall, the unique electronic structure created by the aromaticity of benzene is responsible for its exceptional stability and resistance to chemical reactions, which has made it an important component of many industrial and pharmaceutical applications.

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Answer:

See explanation

Explanation:

In Rutherford's experiment, a gold foil was bombarded with positively charged alpha particles. A zinc sulphide screen was used to observe the movement of the alpha particles during the experiment.

A few particles passed through without deflection while some particles were deflected through large angles.  This observation led Rutherford to the conclusion that the atom was made up of a dense positively charged nucleus where most of its mass was concentrated.