Help, please I’m very confused

The concentration of A decreases and then levels out. Option A

In many chemical reactions, a reactant is consumed as the reaction progresses, leading to a decrease in its concentration over time. The reactant molecules are transformed into products, and as the reaction proceeds, the concentration of the reactant gradually diminishes.

At equilibrium, the concentrations of both reactants and products remain relatively constant over time, although they can coexist.

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True, a capacity to learn a particular skill or acquire a particular body of knowledge.

The capacity to learn a particular skill or acquire a particular body of knowledge depends on a variety of factors, including the individual's motivation, determination, and ability to focus, their existing knowledge and skills base, the quality of instruction and resources available, and the amount of time and effort they are able to devote to learning.

In addition, some individuals may have a natural aptitude for certain topics, while others may have difficulty in acquiring them.

The most effective way to learn a particular skill or acquire a body of knowledge is to approach the task with a positive attitude and an open mind. It is important to set realistic and achievable goals, and to break down difficult tasks into smaller, more manageable steps.

Practicing regularly is also essential, and it is important to seek help and feedback from knowledgeable people or resources when needed. Finally, it is important to take breaks in order to stay motivated and focused.

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There are 0.15 ml of the water contains 150 mg of Pb .

Calculation ,

Formula used :

density = mass / volume                 ( i )

Given mass of the Pb in milligram ( mg ) = 150 mg

Given mass of the Pb in gram ( g ) = 150 × \(10^{-3}\) = 0.15 gram

Given density = 1.0 g/ml

We have to find volume of water in milliliter ( ml ) .

Putting the value of mass of the Pb , lead and density in equation ( i ) we get the volume of water in milliliter ( ml ) .

density = mass / volume

1.0 g/ml  =  0.15 gram / volume

volume =  0.15 gram / 1.0 g/ml = 0.15 ml

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Answer:

Homeostasis is the answer

Explanation: it maintains a constant and stable environment

Answer:

0.44 L.

Explanation:

Density of nickel(II) chloride = 29.8 g/dL.

Mass of nickel(II) chloride = 131 g

Volume of nickel(II) chloride =?

Next, we shall convert 29.8 g/dL to g/L. This can be obtained as follow:

Recall:

1 g/dL = 10 g/L

Therefore,

29.8 g/dL = 29.8 x 10 = 298 g/L

Therefore, 29.8 g/dL is equivalent to 298 g/L.

Finally, we shall determine the volume of nickel(II) chloride as follow:

Density of nickel(II) chloride = 298 g/L

Mass of nickel(II) chloride = 131 g

Volume of nickel(II) chloride =?

Density = mass /volume

298 = 131/Volume

Cross multiply

298 x Volume = 131

Divide both side by 298

Volume = 131/298

Volume = 0.44 L

Therefore, the volume of of nickel(II) chloride is 0.44 L

Answer:

0.694 cents per second

Explanation:

25x100=2500 cents per hour, 2500/60 = 41.67 per minute and 41.67/60=0.694 cents per second

The 0.000065 moles 0.000043 moles of ascorbic acid can be reacted with 0.00013 moles of i2 in this experiment.

What is mole ?

A mole is the atom's elementary particle, an ion. The mole of the substance is always related to the Avogadro number. The mole is always associated with the weight or mass of the element or substance. The standard unit of a mole is mol. The mole is a significant factor of the reactant and products to form an equation. A mole calculates the atom, ion, and substance weighs.

What is reaction ?

A chemical reaction is the transformation of one or more chemicals, known as reactants, into one or more new compounds, known as products. The change in concentration of any of the reactants or products per unit of time can be used to determine the rate or speed of a reaction. It is determined by the equation rate=time + concentration.

Therefore, The 0.000065 moles 0.000043 moles of ascorbic acid can be reacted with 0.00013 moles of i2 in this experiment.

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Lactose contains sugar and glucose, which is found in lactose, glucose will be formed when coffee is added to milk and then lactose is added to the coffee and milk combination.

Because milk contains calcium, it is white in colour and contains the known sugars lactose and glucose. Lactose, a type of sugar present in milk, turns into glucose when combined with coffee.

Farmers dry the brownish bean-shaped coffee seed, which is then ground into a fine powder and combined with milk and sugar to make coffee. In general, Brazil and other nations are where you may find coffee.

Because lactose contains sugar and glucose, when coffee is added to milk and then lactose is added to the coffee and milk solution, glucose will be created.

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Measurements of fossilized tree rings from the Cretaceous period is a paleoclimate proxy. -database of satellite temperature data,

An animal or plant from a previous geologic era that has been preserved in the Earth's crust as a fossil, remnant, impression, or trace. The main repository for knowledge regarding the evolution of life on Earth is the complex of information preserved in fossils found all across the world.

fossils of dinosaurs discovered in Alberta, Canada. Only a small percentage of extinct species have been preserved as fossils, and often only those with a sturdy skeleton are capable of doing so. A calcareous skeleton or shell is present in the majority of major groups of invertebrate creatures (e.g., corals, mollusks, brachiopods, bryozoans). Other types have silicon dioxide or calcium phosphate shells (both of which are found in the bones of vertebrates).

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Answer:

2.7*10^-13

coefficient= 2.7

exponent= -13

Explanation:

Answer: 2.7 x 10^-13

Explanation:

The evidence in the table for each of the following atoms of an element A, B, and C is that   A,B, and C are all particles of the same element; option ii.

Elements are substances that are composed entirely of the same atoms and which cannot be split into simpler units by an ordinary chemical process.

Atoms of the same element have the same number of protons or the same atomic number.

However, atoms of the same element may have different numbers of neutrons, and these atoms of the element are called isotopes.

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The rate of diffusion is the process of molecules dispersing in space in response differences concentration.

The change in the no. of diffusing molecules in a cell is known as diffusion. While the change in the no. of diffusing molecules over time in a cell is known as Rate of diffusion.The group of two or more atoms held together by chemical bonds such as covalent or ionic bond is known as molecule.

Molecules are of three types mainly:

Monoatomic (have one atom only)

Diatomic (Have two atoms)

Polyatomic (have 3 or  more atoms).

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A weak acid-strong base titration will result in a mildly basic solution with a pH value that is higher than 7 but lower than 10.

At the equivalence point of a weak acid-strong base titration, the moles of the added strong base equal the initial moles of the weak acid. The strong base will completely neutralize the weak acid, forming its conjugate base and water.

Since the weak acid is only partially ionized, the resulting solution will have a pH greater than 7. The pH of the solution at the equivalence point will depend on the strength of the weak acid, its initial concentration, and the concentration and strength of the strong base used.

In general, the solution at the equivalence point of a weak acid-strong base titration will be slightly basic, with a pH greater than 7 but less than 10.

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The chemical symbols for three different atoms or atomic cations with 26 electrons are Fe, \(Co^+\), \(Ni^{2+}\)

Explanation:

So, from this, we can write chemical symbols for three different atoms or atomic cations with 26 electrons are Fe, \(Co^+\), \(Ni^{2+}\).

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Answer: 1 x 10-3 mol/L

Explanation:

Question

What concentration of H+ ions does a substance with a pH of 3 have​

the pH is the negative log of the H ion concentration in moles/liter

so pH3 has a hydrogen ion concentration of 1 x 10-3 mol/L

Answer:

A.Experiments with cooking food showed that disease-carrying germs in food could be killed when heated.

Explanation:

Louis Pasteur (1822-1895) is regarded as the father of immunology. He extensively studied microbes and their effect on food. He discovered that microorganisms were responsible for the spoilage of food.

His most important discovery was the fact that heating wine to 55°C will lead to the death of microorganisms and prevented wine from spoiling and did not affect its taste. This process is known as pasteurization.

Answer:

A

Explanation:

The Iupac Name of given three compounds are 3,4,5-trimethylheptane, 2,2,3,3-tetramethylpentane and 2,2- dimethyl-3-ethylpentane.

For (1),

The longest straight chain have 7 carbon compound and having single bond, suffix of this compound is Heptane. Now there are three functional group of methyl there for prefix is trimethyl. Overall the name of compound is 3,4,5-trimethylheptane.

The longest straight chain have 5 carbon compound and having single bond, suffix of this compound is pentane. Now there are four functional group of methyl there for prefix is tetramethyl. Overall the name of compound is 2,2,3,3-tetramethylpentane.

The longest straight chain have 5 carbon compound and having single bond, suffix of this compound is pentane. Now there are three functional group of methyl and ethyl so they write according to alphabetic order. Overall the name of compound is 2,2- dimethyl-3-ethylpentane.

Thus, we concluded that the The Iupac Name of given three compounds are 3,4,5-trimethylheptane, 2,2,3,3-tetramethylpentane and 2,2- dimethyl-3-ethylpentane.

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The fluorescent bulb has a better energy output than the regular bulb.

The main difference between the energy output of a fluorescent bulb and a regular (incandescent) bulb is their efficiency. Fluorescent bulbs are much more energy-efficient than incandescent bulbs because they convert a much higher proportion of the energy they consume into visible light, rather than heat.

Incandescent bulbs work by heating a filament inside the bulb until it glows, emitting light. However, this process is very inefficient, with most of the energy consumed being lost as heat. In contrast, fluorescent bulbs use a small amount of energy to excite a gas inside the bulb, which then emits ultraviolet (UV) light.

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Answer:

There are 1.51 x 1024 molecules of carbon dioxide in 2.50 moles of carbon dioxide.

Explanation:

Answer:

Sedimentary rocks are formed when sediment is deposited out of air, ice, wind, gravity, or water flows carrying the particles in suspension. This sediment is often formed when weathering and erosion break down a rock into loose material in a source area.

Im not sure if this answers your question but here!

Sedimentary rocks are one of three main types of rocks, along with igneous and metamorphic. They are formed on or near the Earth’s surface from the compression of ocean sediments or other processes.

mmg mmñm

Explanation:

no lo seeee123456789

Answer:

blue only

Explanation:

mark me as a brainlist

Answer:

Overall charge of the helium atom is zero

Explanation:

this is because we know the charge of an electron is -1 and the charge of a proton is +1.

there is 2 electrons and 2 protons therefore the charges cancel out.

Therefore the charge of a helium atom is zero

( u can also visualize this as -2+2=0 )

Answer:

B: Ions.

Explanation:

It breaks into two particles when placed into water: A positive ion and a negative ion.

Answer:

CH4

Explanation:

because it CH4 have lesa mass than that of O2

Answer:

Considere uma molécula de glicose (C6H12O6) e indique: a-) O número de átomos de carbono = 6 b-) O número de átomos de hidrogênio = 12 c-) O número de átomos de oxigênio = 6d-) Quantos átomos teremos quando descubro se temos 8 moléculas dessa substância?

  48 oxigênio, 48 carbono e 96 hidrogênio e-) Quantos átomos de cada elemento teremos com 20 moléculas de glicose?

160 de oxigênio e carbono e 240 de hidrogênio.

Explanation:

A glicose é uma das moléculas mais usadas no organismo humano, pois é uma molécula em que sua decomposição é muito mais fácil que os aminoácidos, portanto, eles produzem como produto a moeda de energia que é ATP mais facilmente do que outros alimentos .

A glicose não é encontrada apenas em alimentos açucarados, isso é um mito, na verdade é a unidade de carboidratos (de assados ​​a doces)

2.50 g of helium gas at STP would occupy a volume of 14.0 liters.

Standard temperature and pressure (STP) conditions of 0°C and 1 atm, we can use the molar volume of a gas at STP, which is 22.4 L/mol.

1. Helium seems to have a molar mass of 4.00 g/mol.

Therefore, we can calculate the number of moles of helium as:

moles of He = mass of He divided by molar mass of He

= 2.50 g / 4.00 g/mol

= 0.625 mol

Then, we can use the molar volume of a gas at STP to calculate the volume of helium gas:

volume of He = moles of He x molar volume of gas at STP

= 0.625 mol x 22.4 L/mol

= 14.0 L

2.50 g of helium gas at STP would occupy a volume of 14.0 liters.

2. The molar mass of sodium is 22.99 g/mol. Therefore, we can calculate the number of moles of sodium as:

moles of Na = number of atoms of Na divided by Avogadro's number

= 5.0 x 10²⁵ atoms / 6.022 x 10²³ atoms/mol

= 83.0 mol

Then, we can use the molar mass of sodium to calculate the mass of sodium:

mass of Na = moles of Na x molar mass of Na

= 83.0 mol x 22.99 g/mol

= 1900 g

Therefore, 5.0 x 10²⁵ atoms of sodium have a mass of 1900 g.

3. The molar mass of Ni is 58.69 g/mol. Therefore, we can calculate the number of moles of Ni as:

moles of Ni = mass of Ni divided by molar mass of Ni

= 3.95 g / 58.69 g/mol

= 0.0673 mol

Then, we can use Avogadro's number to calculate the number of atoms of Ni:

number of atoms of Ni = moles of Ni x Avogadro's number

= 0.0673 mol x 6.022 x 10²³ atoms/mol

= 4.05 x 10²² atoms

Therefore, 3.95 g of Ni contain 4.05 x 10²² atoms.

4. The molar mass of Xe is 131.29 g/mol. Therefore, we can calculate the number of moles of Xe as:

moles of Xe = mass of Xe divided by molar mass of Xe

= 15 kg / 131.29 g/mol

= 114 mol

Then, we can use Avogadro's number to calculate the number of atoms of Xe:

number of atoms of Xe = moles of Xe x Avogadro's number

= 114 mol x 6.022 x 10^23 atoms/mol

= 6.87 x10²⁵ atoms

Therefore, a 15 kg sample of Xe gas contains 6.87 x 10²⁵ atoms.

5. A gas's molar volume at STP is 22.4 L/mol. Therefore, we can calculate the number of moles of Ar as:

moles of Ar = number of atoms of Ar divided by Avogadro's number

= 45,000,000 atoms / 6.022 x 10²³ atoms/mol

= 7.47 x 10⁻¹⁷ mol

Then, we can use the molar volume of a gas at STP to calculate the volume of Ar gas:

volume of Ar = moles of Ar x molar volume of gas at STP

= 7.47 x 10⁻¹⁷ mol x 22.4 L/mol

= 1.67 x  10⁻¹⁵ L

Therefore, 45,000,000 atoms of Ar would occupy a volume of 1.67 x 10⁻¹⁵ liters at STP.

6. The molar mass of CO₂ is 44.01 g/mol. Therefore, we can calculate the number of moles of CO₂ as:

moles of CO₂ = mass of CO₂ divided by molar mass of CO₂

= 75 g / 44.01 g/mol

= 1.70 mol

Then, we can use Avogadro's number to calculate the number of atoms of CO₂:

number of atoms of CO₂ = moles of CO₂ x Avogadro's number

= 1.70 mol x 6.022 x 10²³ atoms/mol

= 1.02 x 10²⁴ atoms

Therefore, a 75 g sample of CO₂ contains 1.02 x 10²⁴ atoms.

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