How many electrons are in the outermost shell of an atom of phosphorus (p)? consult the periodic table. 15 5 30.974 3?

Answer:

Independent: exercise.

Dependent: concentration.

Explanation:

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In this case, as the statement says that the experiments is towards the effects of the exercise on concentration it is clear that the independent variable is the exercise as the concentration depends on the performed exercise. Therefore, the dependent variable is the concentration as it changes as a function of the specified exercise.

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The answer to your question is (B) because it does requires the least amount of force for the bicycle to climb the hill.

As water freezes or evaporates, the salinity of the remaining ocean water increases. This is due to the separation of pure water molecules from the dissolved ions during both evaporation and the crystallization process of freezing, leaving behind a higher concentration of salts in the water.

When water freezes or evaporates, the salinity of the remaining ocean water increases. During the process of evaporation, only the water molecules transition from a liquid state to gas and subsequently condense to form clouds, leaving the dissolved ions like salt behind. This concentration effect also occurs when water freezes. Ice crystallizes and incorporates very little of the dissolved salts, thus also leaving behind more concentrated salty water.

In the context of desalination, one can observe how these natural processes of phase change can separate the water from its dissolved substances. While the evaporative process is a distillation that produces almost pure water, the freezing process excludes salts from the solid ice phase. As a result, methods such as evaporation, condensation, and freezing are employed to purify water and reduce its salinity.

Moreover, in temperature dynamics during the freezing of water, the heat released keeps the temperature steady at the melting point while the rest of the water turns into ice. This phenomenon has implications for the thermodynamic properties of water and how such changes affect the surrounding environment.

Final answer:

Unboiled water can be used to prepare an acetic acid solution because acetic acid is a weak acid and its equilibrium is not greatly affected by minor impurities. However, for a NaOH solution, unboiled water could introduce carbonate ions that react with and consume hydroxide ions, altering the solution's concentration and pH, making boiled water necessary.

Explanation:

The question concerns the preparation of solutions utilizing unboiled water, specifically in the context of acetic acid (CH₃COOH) and sodium hydroxide (NaOH) solutions. The reason unboiled water can be used for preparing an acetic acid solution but not for a NaOH solution stems from the nature of acetic acid as a weak acid and NaOH as a strong base.

Acetic acid is a weak acid, which means it only partially dissociates in water. Therefore, the presence of impurities or carbon dioxide (CO₂) from unboiled water doesn't significantly alter the proportion of acetic acid molecules that ionize. This results in a relatively stable solution where the equilibrium is not drastically affected by minor impurities.

In contrast, NaOH is a strong base that fully dissociates in water. Thus, using unboiled water, which may contain dissolved carbon dioxide, could lead to the formation of carbonate or bicarbonate ions. These ions could react with and consume hydroxide ions (OH-), affecting the accuracy of the solution's concentration. Hence, the preparation of a NaOH solution requires boiled water to remove dissolved CO₂, ensuring the reliability of the solution's concentration and pH level.

Answer:

physcial chemist

Explanation:

k12 user. for all of those who understand nothing about this quiz.

The main ideas in Dalton's atomic theory are: all atoms of a given element have the same mass and other properties, each element is composed of tiny, indestructible particles called atoms, and atoms combine in simple, whole-number ratios to form compounds.

The main ideas in Dalton's atomic theory are:

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In water Sodium carbonate dissociates to form Sodium hydroxide and carbon dioxide.

The dissociation reaction for Sodium carbonate is

[tex]\rm \bold{ Na_2CO3 \rightarrow 2 Na^(^+^) + CO_3^(^2^-^)}[/tex]

In water the sodium ion will react with [tex]\rm \bold {OH^-}[/tex] ion of water to form Sodium Hydroxide.

[tex]\rm \bold{ Na_2CO3_(_a_q_)+H_2O \rightarrow 2 NaOH + CO_2}[/tex]

Hence we can conclude that in water, Sodium carbonate dissociates to form Sodium hydroxide and carbon dioxide.

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the number of protons and neutrons in an atom

First convert mass to number of moles. Molar mass of H2C2O2 • 2H2O = 94 / mol

1.89g / (94 g / mol) = .02 mol H2C2O2 • 2H2O

Then we divide by 0.1 L, or 100 mL, and we get a concentration of 0.2 M.

Since there are two positive ions (2 H+), therefore normality is:

0.4 N

Answer:

CH2

Explanation:

Divide by 2 and you get the answer

Explanation:

When zinc chemically reacts with hydrochloric acid in chemical reaction then it leads to the formation of zinc chloride along with evolution of hydrogen gas.

Chemical equation which represents this chemical reaction is as follows.

        [tex]Zn + HCl \rightarrow ZnCl_{2} + H_{2}[/tex]

Number of atoms on reactant side are as follows.

Zn = 1

H = 1

Cl = 1

Number of atoms on product side are as follows.

Zn = 1

H = 2

Cl = 2

Hence, to balance this equation we will multiply HCl by 2 on reactant side. Therefore, the balanced chemical equation is as follows.

              [tex]Zn + 2HCl \rightarrow ZnCl_{2} + H_{2}[/tex]

The ion formed by aluminum has a charge of 3+, known as Al³+. This aluminum cation is formed when aluminum loses three electrons, representing three more positive charges than it has electrons. The charge of 3+ is typical for ions formed from group 13 elements on the periodic table, like aluminum.

The charge on the ion formed by aluminum is 3+. Aluminum, identified by the atomic number 13 on the periodic table, forms a cation when it loses three electrons, resulting in three more positive charges than it has electrons. This is the aluminum cation, represented as Al³+.

Aluminum falls into group 13 of the periodic table, wherein the charge of a cation formed by the loss of all valence electrons is equal to the group number minus 10. Hence, aluminum (in group 13) forms 3+ ions (known as Al³+).

In terms of reactivity, aluminum normally uses all of its valence electrons when reacting, resulting in compounds where it typically has an oxidation state of 3+ - making it a cation. Furthermore, many cations formed from aluminum, such as AlF3 and Al2(SO4)3, are even ionic.

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Final answer:

For a quality control experiment with two parts, where each part can be acceptable, repairable, or scrapped, there are a total of 9 possible combinations of outcomes by multiplying the 3 outcomes of the first part with the 3 outcomes of the second part.

Explanation:

The question involves determining the number of possible outcomes for a quality control experiment with two parts. Each part can result in one of three outcomes: acceptable, repairable, or scrapped. Since there are three possible outcomes for the first part and the same three possible outcomes for the second part, we use the counting principle to find the total number of outcomes for the two parts.

To calculate this, we multiply the number of outcomes for the first part (3) by the number of outcomes for the second part (3), which gives us:

3 outcomes for the first part * 3 outcomes for the second part = 9 total possible outcomes.

The experiment regarding two parts can therefore have 9 different combinations of outcomes.

A pure substance is a sample of matter with a constant composition and with all specimens possessing the exact same properties. Pure substances can either be elements, with only one type of atom, or compounds, composed of two or more types of atoms.

A sample of matter is considered a pure substance when it has a constant composition and all specimens have exactly the same properties. Pure substances can be classified into two categories: elements and compounds. Elements are pure substances that consist of only one type of atom and cannot be broken down by a chemical change while compounds are pure substances that consist of two or more types of atoms. For instance, any sample of sucrose (table sugar) is a pure substance consisting of 42.1% carbon, 6.5% hydrogen, and 51.4% oxygen by mass, having the same physical properties like melting point, color, and sweetness, irrespective of its source.

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In a neutral atom, the number of protons equals the atomic number, which also indicates the same number of electrons.

For a neutral atom, the number of protons is also equal to the atomic number. Atoms are neutral in electrical charge because they have the same number of negative electrons as positive protons. Therefore, the atomic number of an atom also tells you how many electrons the atom has. For instance, hydrogen has an atomic number of 1, which means it has 1 proton and 1 electron. Manganese, with an atomic number of 25, has 25 protons and also 25 electrons when neutral. The atomic number not only signifies the number of protons in an atom but also, by default, the number of electrons in a neutral atom.

Answer : Option A) independent variable.

Explanation : The dark closet (N) was a part of independent variable as it's variable does not depends on any other variable.

Also, growth factor which was the major aim of study was the dependent variable as it was dependent on closet where it was placed.

Constant was the water as the quantity of water was same for both the plants.

Control was the plant that was used for this experiment, as this was the standard that was used for the comparison of the growth.

The mass of a liquid density of 3.2 g/ml and a volume of 25 ml will be 80gm.

The density of a material is the measure of how tightly it is packed together. It is expressed as mass per unit volume. Density Symbol: D.

Density Formula:

d = m/V

Where d is the density, m is the object's mass, and V is the object's volume.

Three of an object's most fundamental properties are mass, volume, and density.

Mass describes how heavy something is, volume describes its size, and density is defined as mass divided by volume.

Although mass and volume are everyday concepts, the concept of density is less obvious and requires careful consideration.

Here it is given that

Density = 3.2g/ml.

Volume = 25 ml.

Mass = ?

Density = mass/volume.

Mass = density x volume.

Mass = 3.2 x 25.

Mass = 80gm.

Thus, the mass of the substance is 80gm.

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