What compound/element is this?

(Easy)

Answer:  COMBUSTION

Explanation:

A combustion reaction is a reaction of a substance (in this case lead; Pb) with oxygen gas (O₂). It is usually an exothermic reaction that produces an oxide..

a. 50 mL < 5 dL (1 dL = 100 mL)

b. 100 mg > 10 μg (1 mg = 1000 μg)

c. 5 cm > 500 mm (1 cm = 10 mm)

d. 10 Ms > 10 ms (1 Ms = 1000 ms)

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Answer:

The time you will get to Atlantic City is 3 pm

Explanation:

Given;

speed limit, v = 50 km/h

distance to be traveled, d = 150km

The time of the motion is given as;

time = distance / speed

t = (150 km) / (50 km/h)

t = 3 hours

Thus, if you leave your home at noon, the time you will get to Atlantic City is given as;

time to get home = 12 pm + 3hours = 3 pm

Therefore, the time you will get to Atlantic City is 3 pm

The carbon mass percent in pure glucose, c6h12o6, is 40.0 percent. A chemist analyses an impure specimen of carbohydrates and defines that the carbon mass percent is 38.2 percent.. Option B - H20 ,water impurities could account for the low mass percent of carbon .

Impurities refer to unwanted substances present in a sample of a pure substance. They can be present in trace amounts or in larger quantities and can affect the properties or performance of the pure substance. Mass percent, also known as weight percent, is a way to express the concentration of a component in a mixture. It is calculated by dividing the mass of the component of interest by the total mass of the mixture, and then multiplying by 100. The resulting number represents the percentage of the total mass that is made up of the component of interest. For example, in the case of glucose, the mass percent of carbon is 40.0% because 40 grams of carbon are present in every 100 grams of glucose.

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Answer:

80.667

Explanation:

math

Answer:

The volume of 9.0 M copper (II) sulfate stock solution needed to prepare 3.0 L of a 5.0 M solution is 1.667 L

Explanation:

Dilution is a process by which the concentration of a solute in solution is reduced by adding more solvent.

In other words, dilution is the procedure followed to prepare a less concentrated solution from a more concentrated one, and it simply consists of adding more solvent.

In a dilution the amount of solute does not vary. What varies in a dilution is the volume of the solvent: as more solvent is added, the concentration of the solute decreases, as the volume (and weight) of the solution increases.

The equation used in this case is:

Ci * Vi = Cf * Vf

where

Ci: initial concentration

Vi: initial volume

Cf: final concentration

Vf: final volume

In this case:

Ci: 9 M

Vi: ?

Cf: 5 M

Vf: 3 L

Acetylene gas (C2H2) is produced as a result of the reaction CaC2(s) + 2 H2O(ℓ) → C2H2(g) + Ca(OH)2(aq). If 37 g of CaC2 are consumed in this reaction, 1.1 moles of water needed.

The term mole is defined as the amount of substance of a system which contains as many elementary entities.

1 mole is equal to 6.023 × 10 ²³ molecules.

Given:

mass of CaC₂ = 37 g

mass of water = ?

The balanced reaction is as follows:

CaC₂  +   2H₂O   ⇒   C₂H₂   +   Ca(OH)₂

2. Convert mass of CaC₂ to moles

molecular mass CaC₂ = 40 + (2 x 12)

= 40 + 24  

= 64 g

64 g of CaC₂ = 1 mol

37 g = x

x = (37 x 1) / 64

x = 37/64

x = 0.57 moles of CaC₂                          

3. Calculate the moles of water

                 1 mol of CaC₂ ----------------- 2 moles of water

                 0.57moles of CaC₂ --------- x

                  x = (0.57 x 2) / 1

                  x = 1.1 moles of water        

Thus, If 37 g of CaC2 are consumed in this reaction, 1.1 moles of water required.

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Answer:

i think it 1/2

Explanation:

As your body needs more oxygen during exercising and produces more carbon dioxide, this might result in a high respiratory rate.

During exercise, your breathing may occur 3–4 times more frequently. Hyperpnea, or rapid, deep breathing, is the body's natural response to increased carbon dioxide generation. The pace of breathing increases along with the blood's concentration of carbon dioxide. The pH of the blood changes dramatically as carbon dioxide levels rise. The chemoreceptors in the medulla oblongata, a part of the hindbrain that controls respiration, detect this shift. To expel the additional carbon dioxide and breathe in more oxygen, the respiratory center speeds up breathing.

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Answer:

Becausee deep - water waves do not interact with the ocean bottom as they travel , their speed is independent of the water depth . But as waves enter shallow water , interaction with the bottom alters the waves . Wave speed decreases , wavelength shortens and wave height increases .

Hope this helps :)

The statement you provided is correct. In a mixture of gases, each gas exerts its own partial pressure independently of other gases present.

This is known as Dalton's Law of Partial Pressures. Additionally, in a closed system, pressure and volume have an inverse relationship, as described by Boyle's Law.

In a mixture of gases, each gas exerts its own partial pressure: This is known as Dalton's law of partial pressures. According to this law, in a mixture of gases, the total pressure is the sum of the partial pressures of each individual gas in the mixture.

In a closed system, pressure and volume have an inverse relationship: This is known as Boyle's law. According to this law, when the temperature of a gas is held constant, the pressure and volume of the gas are inversely proportional.

The amount of gas that will dissolve in a fluid is determined by the solubility of the gas in the given fluid: This is known as Henry's law. According to this law, the amount of gas that dissolves in a liquid at a given temperature is directly proportional to the partial pressure of the gas above the liquid.  

Lastly, the amount of gas that dissolves in a fluid depends on the solubility of the gas in that particular fluid.

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Answer: An experimental group, also known as a treatment group, receives the treatment whose effect researchers wish to study, whereas a control group does not

Explanation:

The control group and experimental group are compared against each other in an experiment. The only difference between the two groups is that the independent variable is changed in the experimental group. The independent variable is "controlled" or held constant in the control group

Question 24:

Answer C : Q is placed in group 13 and period 2.

Question 25:

Answer C : II and IV.

Question 26:

Answer D

Equilibrium. Option C is correct

This law states that a new equilibrium state is achieved if the changes in temperature, pressure, concentration and volume will cause a predictable and opposing changes in the system.

This shows that Le Chatelier's principle can be used to predict the properties above to determine the effect equilibrium have on a system.

Based on the above explanations, we can conclude that Le Chatelier's Principle governs the property of Equilibrium.

Answer:

element

Explanation:

its the only substance type of antom called the element so yeah

To determine the rate constant of a first-order reaction, we can use the equation for the half-life of a first-order reaction: t1/2 = ln(2) / k

Given:

Half-life (t1/2) = 36 min We need to convert the half-life from minutes to seconds to match the units of the rate constant. Therefore, t1/2 = 36 min * 60 s/min = 2160 s.

Now we can rearrange the equation and solve for the rate constant (k):

k = ln(2) / t1/2

Substituting the given value, we have:

k = ln(2) / 2160 s Calculating this expression, we find that the rate constant is approximately 3.214 x 10^(-4) s^(-1). Therefore, the correct answer is option A. 3.2 x 10^(-4) s^(-1).

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Answer:

meteorologist

Answer:

What is the name of the substances that are used at the beginning of a chemical reaction?

The substances that go into a chemical reaction are called the reactants, and the substances produced at the end of the reaction are known as the products.

Explanation:   :)

Answer:

I hope this helps you

:)

Answer:

well because with the velocity of the two, using the second law, it can slow the velocity before there is a casualty.

Explanation:

Answer:

Bow and arrow

Explanation:

A bow and arrow need accuracy to hit a target. It needs precision to hit the small target

Answer:Starting with 51,300 grams of water, we can theoretically produce 45,592 grams of oxygen using electrolysis, based on the balanced equation 2H₂O → 2H₂ + O₂.

In the distillation of a pure material, all of the pure material not vaporize once the boiling point is reached because more heat would need to be added to the distillate in order to vaporize the liquid from its boiling point.

During distillation, the process of vaporizing a liquid and collecting the resulting vapor as a purified substance, it is important to consider the energy requirements involved.

When a liquid reaches its boiling point, it undergoes a phase change from the liquid phase to the gas phase. This phase change requires the input of energy in the form of heat. The heat breaks the intermolecular forces holding the liquid molecules together, allowing them to transition into the gas phase.

The heat required to vaporize a liquid is not solely determined by the boiling point. The heat required to convert a liquid into a gas is known as the heat of vaporization, and it varies depending on the substance.

When distilling a liquid, such as water, the heat of vaporization must be supplied to convert the liquid into vapor. This energy is absorbed by the liquid, and it is essential to provide continuous heating to maintain the distillation process.

As the liquid is heated and reaches its boiling point, vaporization begins. However, the rate at which the liquid vaporizes depends on the amount of heat being supplied. If the heat input is insufficient, the vaporization process will be slower, and not all of the liquid will vaporize at once.

To ensure the complete vaporization of a liquid during distillation, a sufficient amount of heat must be continuously applied to the system. This allows the heat of vaporization to be continually supplied to the liquid, facilitating the conversion of the entire liquid into vapor.

If the heat input is insufficient, the vaporization process will be slower, and the liquid may not vaporize all at once. Providing adequate and continuous heating is crucial to ensure the complete conversion of the liquid into vapor during distillation.

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The state that is reached when ions are entering solution at the same rate at which they leave solution to regenerate a solid is called solubility equilibrium.

Equilibrium is the state in a chemical system where the forward and reverse reactions occur at equal rates, resulting in no net change in the concentrations of reactants and products. In the context of ions entering and leaving a solution, this refers to a dynamic balance between the dissolution of a solid and the precipitation of the same solid.

When ions are introduced into a solution, they have the potential to dissolve and form hydrated ions, increasing the concentration of the ions in the solution. However, at the same time, the hydrated ions can also combine and precipitate as a solid, reducing the concentration of the ions in the solution. When the rate of dissolution and precipitation becomes equal, the system reaches a state of equilibrium, where the concentration of the ions remains constant over time.

In this equilibrium state, the solution and the solid are in a dynamic balance, with ions continuously entering and leaving the solution, but the overall concentration of the ions remains constant. This concept is fundamental in understanding chemical reactions and the behavior of solutions.

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Answer:

see image

D is the answer

Explanation:

see image

the box is like a mini multiplication table

Answer:       freezing

Explanation:

when the atoms or molecules in a solid or liquid are moving slower and closer together, it is called brrrrrrrrr freezinf

A solution at pH 1 has more hydrogen ions than a solution at pH 4. The pH of a solution refers to the hydrogen ion concentration.

The concentration of hydrogen ions and the pH of a solution are inversely proportional. This means that the higher the hydrogen ion concentration, the lower the pH, and vice versa.

A solution at pH 1 will have more hydrogen ions than a solution at pH 4.The pH of a solution is defined as the negative logarithm of the hydrogen ion concentration. The equation for calculating the pH of a solution is given as follows:

\($$pH = -\log_{10}[H^+]$$\)

In this equation, [H⁺] is the hydrogen ion concentration in moles per liter (mol/L) of solution. A change of 1 pH unit corresponds to a 10-fold change in the hydrogen ion concentration.

Therefore, if a solution has a pH of 1, it has a hydrogen ion concentration of 0.1 mol/L.

If a solution has a pH of 4, it has a hydrogen ion concentration of 0.0001 mol/L. Thus, a solution at pH 1 has more hydrogen ions than a solution at pH 4.

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Answer: The mass of Al2O3 that forms is 275.4 g. Don't worry! Help has arrived! Read the explanation below:

Brainliest?

Explanation:

The balanced chemical equation for the reaction between aluminum (Al) and oxygen (O2) to form aluminum oxide (Al2O3) is:

4 Al + 3 O2 → 2 Al2O3

According to the problem, we know that the limiting reactant is O2 and that it forms 2.7 mol of Al2O3. We can use the stoichiometry of the balanced chemical equation to calculate the amount of Al2O3 that would be formed from 3 mol of O2, which is the amount that would react with 4 mol of Al:

4 Al + 3 O2 → 2 Al2O3

3 mol of O2 → 2 mol of Al2O3

We can use the mole ratio from the balanced equation to convert the amount of O2 that reacted to the amount of Al2O3 that formed:

2.7 mol of Al2O3 × (3 mol of O2 / 2 mol of Al2O3) = 4.05 mol of O2

This tells us that if we had 4.05 mol of O2, it would react completely with 4 mol of Al to form 2.7 mol of Al2O3. However, since we only have a limited amount of O2 (the limiting reactant), we know that not all of the Al will react, and some of it will be left over.

To calculate the mass of Al2O3 that forms, we can use the amount of O2 that reacted (which we just calculated) to determine the amount of Al that reacted:

4 Al + 3 O2 → 2 Al2O3

4.05 mol of O2 × (4 mol of Al / 3 mol of O2) = 5.4 mol of Al

This tells us that 5.4 mol of Al reacted with the 2.7 mol of Al2O3 that formed. To calculate the mass of Al2O3, we can use the mole ratio from the balanced equation and the molar mass of Al2O3:

2.7 mol of Al2O3 × (102 g/mol) = 275.4 g of Al2O3

Therefore, the mass of Al2O3 that forms is 275.4 g.