Tablet salt (sodium chloride) is an example of a(n): A) element B) compound C) mixture

The variable "air pressure inside the football" in this experiment is quantitative and dependent variable. Hence, option D is correct.

The dependent variable is the variable that is being measured or tested in an experiment.

In the experiment, the scientist filled the footballs with fix quantity of pressure which was then kept for 12 hours. After 12 hours the pressure inside the footballs was again measured. Pressure here is a quantitative variable.

Since the air temperature is an independent variable. The pressure being the dependent variable depends upon the temperature of the air.

Independent variable; The variable which does not depends upon any other variable.

Dependent variable; The variable which depends upon the independent variable or varies with the change independent variable.

Qualitative variables are variables which cannot be expressed in form of numbers. They generally convey the characteristic, category, quality or type.

Whereas Quantitative variables are the variables which can be expressed in the form of numbers. These are the variables which exist along the continuous sequence.

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Answer:

A

Explanation:

Answer:

D

Explanation:

best choice, makes the most sense

In the scientific method, conducting an experiment involves designing and performing controlled experiments to test a hypothesis and the correct option is option B.

Scientists manipulate the independent variable while controlling other variables (dependent and controlled variables) to observe and measure the effect on the dependent variable.

By controlling variables, scientists can isolate the factors that influence the outcome, ensuring that any observed changes are a result of the manipulated variable and not other unrelated factors. This step allows for the collection of reliable data, which is essential for drawing meaningful conclusions based on the evidence gathered from the experiment.

Thus, the ideal selection is option B.

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The scratched tin can with the iron will more rapidly corrode the iron than the tin.

The corrosion can be given as the process of the oxidation of the metal into the more stable metal oxide. The chemical oxidation of the metal is attained with the surrounding available oxygen or the water vapors.

The reactivity of the Iron for the oxidation is more as compared to the tin from the reactivity series. Therefore if both tin and iron are exposed to corrosion, iron will be more rapidly corroded.

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Let's see the original equation:

In the reactants, we have 1 mol of C2H2 and 2 moles of H2. And in the products, we have 1 mol of C2H6.

Below the image, you can see that 2 moles of C2H2 are reacting with 8 moles of H2 but you can realize that there is an excess of H2, because if we want to use 2 moles of C2H2, we will require just 4 moles of H2.

You can note this by multiplying each number of moles in the initial equation by two. The chemical reaction, based on these numbers would be:

So, in the reaction we're going to have 2 moles of C2H6, on the leftovers reactants: 0 moles of C2H2 and 4 moles of H2 because we're only requiring 4 moles of H2 from 8 moles of this.

Answer:

30.9 g He

Explanation:

To find the mass of the helium (He) sample, you need to

(1) convert atoms to moles (using Avogadro's Number)

(2) convert moles to grams (using the atomic mass of He)

It is important to arrange the conversions/ratios in a way that allows for the cancellation of units. The final answer should have 3 sig figs like the given value (4.65 x 10²⁴ = 3 sig figs).

Avogadro's Number:

6.022 x 10²³ atoms = 1 mole

Atomic Mass (He): 4.0026 g/mol

4.65 x 10²⁴ atoms He                     1 mole                     4.0026 g
--------------------------------  x  --------------------------------  x  -----------------  =  30.9 g He
                                             6.022 x 10²³ atoms              1 mole

The possible action your solution might contain is amongst \(Ag^+\), \(Pb^{2+}\), or \(Ca^{2+}\).

A solution is a homogeneous mixture of one or more solutes dissolved in a solvent.

NaCl: 20 drops of NaCl were used and no precipitate was formed.

No precipitation formed means the \(Cl^-\) cation is soluble in water. From your chart, you might see the halide of \(Ag^+\) and \(Pb^{2+}\) is insoluble in water, which means they should have formed precipitation but you didn't. This means there's less possibility it contains \(Ag^+\) or \(Pb^{2+}\), so we are left with only \(Ca^{2+}\). Let's confirm it with the rest.

\(Na_2SO_4\) : 20 drops of \(Na_2SO_4\) were used yellow precipitate was produced.

Even though all other sulfates form precipitation ( Insoluble in water)

\(Na_2CO_3\) : 20 drops of sodium carbonate were used and the silver-blue precipitate was produced.

It seems all of their Carbonate is insoluble in nature. ( which is our case too ).

From the above result, only the reaction with NaCl was deemed to be decisive and it indeed contains \(Ca^{2+}\) ions. Means you are correct.

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Taking into account the definition of Avogadro's Number, the mass of 2.50×10⁴ molecules of chlorine gas is 2.94235×10⁻¹⁸ grams.

Avogadro's Number is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.

The molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.

You can apply the following rule of three: if 6.023×10²³ molecules are contained in 1 mole of chlorine, then 2.50×10⁴ molecules are contained in how many moles of chlorine?

amount of moles of chlorine= (2.50×10⁴ molecules × 1 mole)÷ 6.023×10²³ molecules

amount of moles of chlorine= 4.15×10⁻²⁰ moles

Being the molar mass of Cl₂ 70.9 g/mole, you can apply the following rule of three: If by definition of molar mass 1 mole of the compound contains 70.9 grams, 4.15×10⁻²⁰ moles of the compound contains how much mass?

mass= (4.15×10⁻²⁰ moles× 70.9 grams)÷ 1 mole

mass= 2.94235×10⁻¹⁸ grams

Finally, the mass is 2.94235×10⁻¹⁸ grams.

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Answer: A

Explanation: i took the test

Answer:

я не знаю ответа :(

Explanation:

Answer:

it defuse at a rate of 0.0002 m/s

The reaction between aluminum and oxygen can be expressed by the following balanced formula:

We see that 4 moles of aluminum react with 3 moles of oxygen. This means that the O2 to Al ratio is 3/4. Therefore, the moles of O2 needed will be:

Answer: Are required 11.1 moles of O2 to react with 14.8 mol Al.

Answer:

Hello dear

Explanation:

The concentration of HCONH2 in equilibrium is 0.55M

Therefore, at 1.82 atm and 22°C, 218 mol of H2 will fill a volume of 888 L.

1 mole of any gas will take up 22.4 L of space at Standard Temperature and Pressure (STP). The quantity may be determined using the Ideal Gas Law and a balanced chemical equation.

The ideal gas law can be used to resolve this issue:

PV = nRT

The temperature must first be converted to Kelvin by adding 273.15:

T =22°C+273.15

= 295.15 K

After that, we may enter the following values:

P = 1.82 atm

n = 218 mol

R = 0.0821 L·atm/mol·K (gas constant)

So the equation becomes:

V = nRT / P

V = (218 mol)(0.0821 L·atm/mol·K)(295.15 K) / (1.82 atm)

V = 888 L.

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The substance is pure matter, it is either an element or a compound. If a substance can be divided into its component elements matter, it is a compound.

If a substance is not chemically pure, it is either a homogeneous mixture or a heterogeneous mixture.

If the composition remains the same throughout, the combination is homogeneous.

The two major categories into which matter can be categorised are pure substances and mixtures. Pure substances and mixtures are the two major categories into which matter may be divided.

A sort of matter known as a pure substance has qualities that are continuous throughout the sample and a stable composition that makes it the same everywhere. A matter is a substance made up of two or more different components.

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For this question, we will analyze each option:

1. Strong bonds are difficult to break, this is true, since the compound has a bond that can hold longer, it is required more energy to break it

2. Bonds made between two atoms with a very different electronegativity are difficult to break, these are ionic compounds and these compounds tend to have a very strong bond

3. Shorter bonds are weaker, if we are talking about the distance between two atoms, then shorter bonds tend to be stronger, and it is required more energy to break it

4. Assuming that this option is actually saying that "bond breaking release energy" this would be a wrong statement, since bond breaking requires energy and not release it

Therefore according to these assumptions, the only option correct is letter A

Answer:

D) a four-fold increase

Explanation:

According to Gay-Lussac's law, which states that the pressure of a given amount of gas is directly proportional to the temperature at a constant volume, the pressure increases with an increase in temperature.

According to this question, at a fixed volume, a four-fold increase in the temperature of a gas will lead to a four-fold increase in the pressure as well.

Answer:

5 km/h

Explanation:

divide the hours to the distance

The given equation represents the reaction between zinc (Zn) and nitric acid (HNO3). The balanced chemical equation for this reaction is : Zn + HNO3 → Zn(NO3)2 + H2Zinc is a metal, and nitric acid is an acid.

This reaction is a redox reaction as the oxidation state of Zinc is changed from 0 to +2, and the oxidation state of Nitrogen in Nitric acid is changed from +5 to +4.The reactants in the equation are zinc and nitric acid. Zinc is a solid metal, while nitric acid is a colorless, corrosive liquid. In this reaction, zinc reacts with nitric acid to form zinc nitrate and hydrogen gas. Zinc nitrate is a white crystalline substance that dissolves in water easily. Hydrogen gas is a colorless, odorless gas.The balanced chemical equation for this reaction is derived by ensuring that the total number of atoms of each element in the reactants is equal to the total number of atoms of the same element in the products. The coefficients in front of each substance show the number of atoms or molecules of each substance needed for the reaction to occur.In this case, one atom of zinc reacts with one molecule of nitric acid to form one molecule of zinc nitrate and one molecule of hydrogen gas.

The reaction between zinc and nitric acid is an exothermic reaction as heat is released during the reaction.The reaction between zinc and nitric acid is an important reaction as it is used in the production of zinc nitrate, which is used in the manufacture of other zinc compounds.

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Answer:

41826.05 Calories

Explanation:

1 J = 0.239006 Calories

175 KJ

= 175 x 1000 J

= 175000 J

175000 J to Calories

= 175000 x 0.239006

= 41826.05 Calories

Answer: 41.8

Explanation:

Acellus verified ✅

Answer:

Do you mean Esterification experiment?

Explanation:

The mass (in grams) of fluorine gas, F₂ required to produce 219.79 grams of colbalt (ii) fluoride, CoF₂ is 86.17 grams

We'll begin by writing the balanced equation. This is given below:

CoCl₂ + F₂ -> CoF₂ + Cl₂

From the balanced equation above,

96.93 g of CoF₂ were obtained from 38 g of F₂

Now, we shall determine the mass of fluorine, F₂ needed to produced 219.79 g of colbalt (ii) fluoride, CoF₂. This is shown below::

From the balanced equation above,

96.93 g of CoF₂ were obtained from 38 g of F₂

Therefore,

219.79 g of CoF₂ will be obtain from = (219.79 × 38) / 96.93 = 86.17 g of F₂

Thus, the mass of fluorine, F₂ needed is 86.17 g

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Understanding how quickly chemical reactions occur is the focus of the physical chemistry subfield known as chemical kinetics. In contrast to thermodynamics, which focuses on the direction in which a process takes place but says nothing about its rate, it is to be contrasted with this.

A chemical reaction is a procedure that causes one group of chemical components to change chemically into another. Chemical reactions, which can frequently be described by a chemical equation, traditionally include changes that only affect the locations of electrons in the formation and dissolution of chemical bonds between atoms, with no change to the nuclei (no change to the elements present). The study of chemical processes involving unstable and radioactive elements, where both electronic and nuclear changes may take place, is known as nuclear chemistry. Reactants or reagents are the substance(s) or substances that are initially utilized in a chemical reaction. Chemical reactions typically involve a chemical change and produce one or more products, which typically differ from the reactants in some ways. The details of the particular course of action are part of the reaction mechanism. Reactions frequently consist of a series of discrete steps, or elementary reactions. Chemical equations, which represent the initial substances, final products, and occasionally intermediate products as well as the reaction circumstances symbolically, are used to describe chemical reactions.

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Answer:

e

Explanation:

cm is not the unit of wave number out of the following.

Definition: Total number of wave cycles present in a unit distance is termed a wave number.

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1. Examples of solids, liquids, and gases found in a home

Solids: books, furniture, toys

Liquids: water, juice, shampoo

Gases: air, natural gas, propane

2. The human body contains solids, liquids, and gases. Solids include bones, muscles, and organs. Liquids include blood, saliva, and urine. Gases include air in the lungs and dissolved gases in the bloodstream. The body is mostly made up of liquids, as they make up a large percentage of its overall volume.

3. If you needed to remove the water from a sample of blood to study the solids that remained, you could use a process such as evaporation or freeze-drying. Evaporation involves heating the sample to allow the water to evaporate, leaving behind the solids. Freeze-drying involves freezing the sample and then removing the water under vacuum, leaving behind a dry solid.

4. Some metals that could be found within the human body include iron, zinc, and copper. These metals are commonly found in foods such as meat, seafood, nuts, and whole grains. Other metals such as calcium, magnesium, and potassium are also important for the body and are found in a variety of foods.

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The true statements are;

The reaction is endothermic

Heat is a reactant

ΔHrxn is 89 kJ/mol

Enthalpy is a thermodynamic property that represents the total energy of a system, including both its internal energy (the energy of its constituent particles) and the energy it has due to its temperature and pressure. It is commonly used in energy analysis and heat transfer calculations and is expressed in units of joules (J) or calories (cal).

We know that the enthalpy of the reaction can obtained from;

Enthalpy of the products - Enthalpy of the reactants

ΔH reaction = 2(-391.4) - 2(-435.9)

(-782.8) - (-871.8)

= 89 kJ/mol

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Answer:

1. NaCl

2. NH4F

3. MgO

4.LiCl

5. KI

6. CaO

Explanation:

In that order

Not enough information man