The behavior of cathode rays in a glass tube containing gas at low pressure led scientists to conclude that the rays are composed of:.

Familiar substances that sublime readily include iodine , dry ice , menthol, and camphor. Sublimation is occasionally used in the laboratory as a method for purification of solids, for example, with caffeine.

The empirical formula of the compound made up of 70.0% iron and 30.1% oxygen is Fe₂O₃, and the molecular formula can be the same as the empirical formula, Fe₂O₃.

To determine the empirical formula, we need to find the simplest whole-number ratio of the elements present in the compound. Given the percentages of iron (Fe) and oxygen (O), we can assume a 100 g sample of the compound.

The mass of iron is 70.0 g (70.0% of 100 g), and the mass of oxygen is 30.1 g (30.1% of 100 g).

Next, we calculate the moles of each element using their respective molar masses:

moles of Fe = 70.0 g / 55.85 g/mol ≈ 1.252

moles of O = 30.1 g / 16.00 g/mol ≈ 1.881

Then, we divide the number of moles of each element by the smallest number of moles to obtain the simplest whole-number ratio:

1.252 / 1.252 ≈ 1 (for Fe)

1.881 / 1.252 ≈ 1.5 (for O)

Since we need to express the empirical formula using whole numbers, we multiply the ratio by 2 to obtain the simplest ratio:

1 × 2 = 2 (for Fe)

1.5 × 2 = 3 (for O)

Therefore, the empirical formula of the compound is Fe₂O₃, and the molecular formula can be the same as the empirical formula, Fe₂O₃.

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The first two chemical equations are reversible while the other two are irreversible.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.

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The molarity of an HCl solution if 41.73 mL of HCl reacts with 7.8111 grams of sodium carbonate is 1.77M. Details about molarity can be found below.

The molarity of a solution can be calculated by dividing the number of moles of the substance by its volume.

According to this question, 7.8111 grams of sodium carbonate (106 g/mol) is given. The number of moles of sodium carbonate is calculated as follows:

no of moles = 7.811g ÷ 106g/mol = 0.074mol

Molarity of HCl = 0.074mol ÷ 0.04173L

Molarity of HCl = 1.77M

Therefore, the molarity of an HCl solution if 41.73 mL of HCl reacts with 7.8111 grams of sodium carbonate is 1.77M.

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Answer:

regr vldfpelrg

Explanation:

Answer:

i think A is the answer (the water vapor fills less space)

The scientific statement is

D. There is life on some other planet in the universe aside from Earth.

A scientific statement is a statement that is based on empirical evidence, logical reasoning, and the scientific method. It is a claim or proposition that can be tested, observed, or measured, and is subject to scrutiny and verification.

Scientific statements are characterized by objectivity, reliance on evidence, and the potential for falsifiability or validation through experiments or further investigation. these statements aim to describe, explain, or predict phenomena in the natural world and are an essential part of scientific inquiry and the advancement of knowledge.

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complete question

Which sentence is a scientific statement?

A.

Food cooked in ceramic pots has a better aroma than food cooked in copper pots.

B.

A tall glass of water tastes better with a lemon wedge and ice cubes.

C.

Today, there are more viewers watching baseball than ice hockey on television.

D.

There is life on some other planet in the universe aside from Earth

When we balance this equation

       S₈(s) + F₂(g) ⇄ SF₆(g)

We will get

      S₈(s) + 24F₂(g) ⇄ 8SF₆(g)

Balancing this equation

      S₈(s) + F₂(g) ⇄ SF₆(g)

We have to balance the number of S

      S₈(s) + F₂(g) ⇄ 8SF₆(g)

We have to balance the number of F

      S₈(s) + 24F₂(g) ⇄ 8SF₆(g)

We will get balanced equation

      S₈(s) + 24F₂(g) ⇄ 8SF₆(g)

The reaction quotient will be

     Qc = [product] / [reactant]

     Qc ​= [SF₆(g)] / [ S₈(s) + F₂(g)]

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The Secchi disk, used to measure water transparency, typically becomes blurred but visible at a depth of about 10-20% of the total Secchi disk depth.

To find the percentage of visibility, divide the depth at which the disk is blurred but visible by the total Secchi disk depth and multiply by 100. For example, if the blurred visibility occurs at 1 meter and the total Secchi disk depth is 5 meters, the percentage is (1/5)*100 = 20%.

The Secchi disk is blurred but visible at a depth of approximately 10-20% v/v of the total Secchi disk depth, depending on various factors such as water clarity and lighting conditions.

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n-butanol is a moderately polar organic compound, which means that it is able to dissolve in water to form an aqueous solution.

However, when salt is added to the solution, the salt ions disrupt the hydrogen bonding between the water molecules and the n-butanol molecules.

This causes the n-butanol to become less soluble in the water and more soluble in the dichloromethane. As a result, the n-butanol will preferentially dissolve in the dichloromethane, allowing it to be extracted from the aqueous solution.

Here is a step-by-step explanation of how this works:

1. Start with an aqueous solution of n-butanol.
2. Add salt to the solution. The salt ions will disrupt the hydrogen bonding between the water molecules and the n-butanol molecules.
3. Add dichloromethane to the solution. The n-butanol will preferentially dissolve in the dichloromethane, which is a non-polar solvent.
4. Separate the dichloromethane layer from the aqueous layer. The n-butanol will be in the dichloromethane layer, allowing it to be extracted from the aqueous solution.

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Answer:

Burning of paper is not a physical change.It is chemical change as ash is formed in the process which is new compound and oxides of carbon are also released during the process!

Answer:

In other words, the hot dog buns limit the number of complete hot dogs we can produce. ... The amount of a product that is formed when the limiting reactant is fully ... the limiting reactant and calculate the theoretical yield for an actual chemical reaction. ... Method 1: For the first method, we'll determine the limiting reactant by ...

Explanation:

Regarding the limiting reagent, it is true that:

Which of the following is true of a limiting reagent?

Regarding the limiting reagent, it is true that:

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According to common weather maps of the region surrounding Salem, Massachusets, the weather typically associated with the air pressure system is rain.

Air pressure systems define areas where the interaction between temperatures and air currents creates weather. Air pressure systems can be of two types:

Given the nature of warm air and its tendency to rise, warmer regions tend to fall under the low-pressure system category. These systems, due to the movement of the warm air, have lower pressure at their center than in the areas surrounding them.

As the wind blows towards the low-pressure air systems, the cooler and warmer air meet within the atmosphere, which causes the water vapor to condense and form clouds. Oftentimes, these clouds then precipitate, causing rain.

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Among the three companies, Company A has the highest acid-test ratio (2.67), followed by Company B (2.00), and then Company C (1.75). The higher the acid-test ratio, the better the company's ability to meet short-term obligations without relying on inventory sales. Therefore, Company A is in the best position to meet short-term obligations.

To compute the acid-test ratio (also known as the quick ratio) for each company, we'll use the formula:

Acid-Test Ratio = (Current Assets - Inventory) / Current Liabilities

a. Compute the acid-test ratio for each company:

Company A:

Current Assets = $250,000

Inventory = $50,000

Current Liabilities = $75,000

Acid-Test Ratio for Company A = ($250,000 - $50,000) / $75,000

Acid-Test Ratio for Company A = $200,000 / $75,000

Acid-Test Ratio for Company A ≈ 2.67

Company B:

Current Assets = $150,000

Inventory = $30,000

Current Liabilities = $60,000

Acid-Test Ratio for Company B = ($150,000 - $30,000) / $60,000

Acid-Test Ratio for Company B = $120,000 / $60,000

Acid-Test Ratio for Company B = 2.00

Company C:

Current Assets = $300,000

Inventory = $90,000

Current Liabilities = $120,000

Acid-Test Ratio for Company C = ($300,000 - $90,000) / $120,000

Acid-Test Ratio for Company C = $210,000 / $120,000

Acid-Test Ratio for Company C = 1.75

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Moles of diprotic acid present were:

A mole of diprotic acid contains 0.0023 moles \(H_{2}A\).

Law of dilution:

Titrations are conducted using the law of dilution.

The number of moles of solute divided by the arrangement's volume in liters is known as molarity.

The number of moles per liter of solution is referred to as molarity. Additionally, we write it as M. Furthermore, we employ the following equation to determine molarity:

Molarity = moles of solute/liter of solution.

Calculation:

Moles of acid = moles of base

n = M/V

Moles of \(H_{2}A\) = Moles of NaOH used

Therefore,  0.100 x 0.02258L = 0.0023 mol \(H_{2}A\)

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Answer:

13 if Im right?

Explanation:

To produce one molecule of glucose, 6 molecules of carbon dioxide (\(CO_{2}\)), 18 molecules of adenosine triphosphate (ATP), and 12 molecules of nicotinamide adenine dinucleotide phosphate (NADPH) are required.

Glucose, a six-carbon sugar, is synthesized through the process of photosynthesis in plants. It involves the Calvin cycle, which incorporates carbon dioxide, ATP, and NADPH to produce glucose. For each molecule of glucose formed, 6 molecules of carbon dioxide are required.

The energy needed for glucose synthesis is provided by ATP, which is an energy-rich molecule. In the Calvin cycle, the synthesis of one glucose molecule requires 18 molecules of ATP.

NADPH, a coenzyme involved in energy transfer reactions, is required for the reduction of carbon dioxide during the Calvin cycle. In the process, 12 molecules of NADPH are utilized to produce one molecule of glucose. These components play crucial roles in capturing and storing energy, as well as providing carbon atoms for the formation of glucose, which serves as a vital energy source for organisms.

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Answer:

Decrease

Explanation:

Since the speed in which the gas molecules are faster as they are heated, they fly around in the container and logically, it is harder to insert a moving object into water than something more stationary or slower.

Answer:

D. by repeating trials during an experiment

Explanation:

chile its actually d

Explanation:

Answer:1 mole of helium gas contains 6.02 x1023 helium atoms

Explanation:I hope this helps

The +2.00 V is the standard cell potential for a galvanic cell that consists of al3 /al and cu2 /cu half-cells.

What is galvanic cell ?

A galvanic cell or voltaic cell is an electrochemical device that transforms chemical energy from spontaneous redox reactions into electrical energy. Galvanic cell A voltaic cell is an electrochemical device that uses chemical reactions to produce electricity.

What is standard cell ?

A standard cell is a collection of transistor and connection structures that performs boolean logic operations (such as AND, OR, XOR, XNOR, inverters) or storage operations (flipflop or latch).

The standard half reactions are

Al3+ (aq) + 3 e- -------> Al (s); E0 (Al3+/Al) = -1.66 V

Cu2+ (aq) + 2 e- ------> Cu (s); E0 (Cu2+/Cu) = +0.34 V

Since Cu2+/Cu has a more positive standard reduction potential as compared to Al3+/Al, hence, Cu2+ will be reduced while Al will be oxidized. The half reactions comprising the redox reaction are then

Reduction: Cu2+ (aq) + 2 e- --------> Cu (s)           E0red = +0.34 V

Oxidation: Al (s) -------> Al3+ (aq) + 3 e-              E0ox = -E0(Al3+/Al) = -(-1.66 V) = +1.66 V

The redox reaction is given as

3 Cu2+ (aq) + 2 Al (s) -------> 3 Cu (s) + 2 Al3+ (aq)

E0cell = E0red + E0ox

= (+0.34 V) + (+1.66 V)

= +2.00 V

Therefore, +2.00 V is the standard cell potential for a galvanic cell that consists of al3 /al and cu2 /cu half-cells.

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The directed movements toward or away from chemical or physical signals are known as taxi.

Taxis is a behavioral response exhibited by organisms in which they move in a particular direction in response to a specific chemical or physical stimulus in their environment. These stimuli can include light, heat, chemicals, gravity, and other factors. Positive phototaxis refers to movement toward a light source, while positive chemotaxis refers to movement toward a particular chemical substance.

Negative geotaxis refers to movement away from the force of gravity, while negative thermotaxis refers to movement away from high temperatures Taxis allows organisms to navigate their surroundings and respond to stimuli in a way that promotes their survival and well-being. It plays a crucial role in various biological processes, including finding food, avoiding predators, and seeking favorable environmental conditions.

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According to the electron sea model, the melting points of metals are not as extreme as the boiling points. Therefore, the given statement is correct is true.

The Electron Sea Model's whole hypothesis relies around the behavior of atoms throughout this bonding. The movement of unpaired electrons between positively charged metal ions in a mesh is known as metallic bonding.

According to the electron sea model, the melting points of metals are not as extreme as the boiling points. This is because the cations and electrons are - in a metal. It does not take much energy for a solid to become liquid. But metallic bonds are very - , so it does require a lot of energy to separate atoms from the cations in their sea of electrons. This statement is true.

Therefore, the given statement is correct is true.

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You can test whether a substance is soluble by heating the substance up.

Solubility is the property that a substance has to be able to dissolve in another that can be called a solvent. Whether a substance is polar or nonpolar depends a lot on the solubility of the substance since with this the substance is more or less soluble. The more polar a substance is because of its functional groups, the more soluble it will be.

Solubility is determined by the intermolecular forces that exist between the solvent and the solute and not all substances will be able to dissolve in others, such as oil cannot dissolve in water

A good way to know if the solute dissolves is by heating the solution, so the substance that dissolves is the solute and the one that remains will be the solvent.

Therefore, we can confirm that you can test whether a substance is soluble by heating the substance up.

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Answer:

Number 3

Explanation:

u can see whether a substance is soluble by heating the substance up

Answer:

idrk im sorry and iknow this didnt help bt im sorry

Explanation:

Answer:

calcium oxide

Explanation:

Correct option is A)

Magnesium metal is an alkaline earth metal. The tendency of these metals is to lose electron. They lose electron and form oxide. Now, they are stable hence it is very difficult for them to again gain that electron. Hence, they are not reduced by normal reducing agents.

By using Dalton’s law of partial pressure, it is calculated that the \(CO_2\)collected in the experiment has a pressure of 725.35 mm Hg.

A gas mixture's total pressure is equal to the total of the partial pressures of its component gases, according to Dalton's law of partial pressures.

Looking at the pressure in a closed container of gas and water is a frequent application of the Dalton's law of Partial Pressures. The pressure that the gas puts on the liquid is the system's overall pressure.

Real gases do not behave in an ideal manner; instead, they behave in an ideal manner only at low pressures and high temperatures. As a result, Dalton's law of partial pressure is only relevant at low pressures and low temperatures; it is not applicable at high pressures and low temperatures.

Given:

Pressure of mixture = 744 mm Hg

Temperature = 21℃

Pressure of Water vapour = 18.65 mm Hg

To find:

Pressure of \(CO_2\) = ?

Formula:

Pressure of mixture = Pressure of \(CO_2\) + Pressure of water vapour

Pressure of \(CO_2\) = 744 - 18.65

P of \(CO_2\) = 725.35 mm Hg

Result:

The pressure of \(CO_2\) collected in the experiment is 725.35 mm Hg, according to Dalton’s law of partial pressure.

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answer

1. Neon

2. Astatine

3. oxygen

4. Arsenic

5. Silicone

6. Aluminium

7. Calcium

8. Sodium