32. Describe how scientific notation makes it easier to
work with very large or very small numbers.

To form ionic bonds, atoms transfer electrons. Consider sodium as: It is permanent in its anionic form and has one valence electron.

Ionic connections are created when specific electrons are fully transferred from one atom to another. When atoms lose one or more electrons, cations are produced (positively charged ions). When an atom receives one or more electrons, it produces an anion (negatively charged ion) .

Ionic bonding is demonstrated via the synthesis of sodium fluoride (NaF) from sodium and fluorine atoms. The sodium atom's lone valence electron is accepted in this process by a fluorine atom that has just enough area to accommodate it. Ions or charged molecules are referred to as "ionic" compounds. Ionic bonds are the interaction between ions with different charges. If we glance at the adjective, ionic, we can tell that the subject is science. Ionic bonds hold two or more atoms together to form ionic molecules.

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The change to the reactants that would accomplish increase in reaction rate is increase in concentration of reactant.

Reaction rate is the speed at which a chemical reaction proceeds.

It is expressed in terms of either the concentration of a product that is formed in a unit of time or the concentration of a reactant that is consumed in a unit of time.

Here, a student wants to increase the rate of a reaction that involves gases.

The increase in reaction rate will be result of increase in concentration of reactant.

In case of gases, it can be done via:

Increasing the pressure and decreasing the volume.

Hence, the change to the reactants that would accomplish increase in reaction rate is increase in concentration of reactant. Increasing the pressure and decreasing the volume are ways to accomplish this.

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The assumption that accounts for the great compressibility of gases compared to liquids and solids is assumption 1: Gases are made up of molecules which are relatively far apart. Option A)

The assumption that accounts for the great compressibility of gases compared to liquids and solids is assumption 1: Gases are made up of molecules which are relatively far apart.

In gases, the molecules are widely spaced and have significant gaps between them. This allows gases to be easily compressed under pressure. When external pressure is applied to a gas, the molecules can be brought closer together, reducing the volume occupied by the gas. The gaps between the molecules provide room for compression, allowing gases to occupy a smaller volume.

In contrast, liquids and solids have molecules or particles that are closely packed together. The intermolecular forces in liquids and solids are stronger, limiting their compressibility. The molecules or particles are already in close proximity, leaving little room for further compression.

Therefore, the assumption that gases consist of molecules that are relatively far apart accounts for their greater compressibility compared to liquids and solids. Hence Option A) is correct.

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0.10 mol H₃PO₄

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Atomic Structure

Step 1: Define

6.3 × 10²² molecules H₃PO₄

Step 2: Identify Conversions

Avogadro's Number

Step 3: Convert

Step 4: Check

Follow sig fig rules and round. We are given 2 sig figs.

0.104616 mol H₃PO₄ ≈ 0.10 mol H₃PO₄

The "Wakanda speech," six weeks have passed, and the world is still in shock.

Thus, Global leaders and analysts were taken aback by King T'Challa's declaration at the United Nations General Assembly that the Kingdom of Wakanda is not a developing country of textiles, farms, and shepherds with a GDP per person of roughly $760 but rather a technological superpower and Wakanda speech.

The country's widespread employment of cutting-edge magnetic levitation trains, flying machines, opaque holograms, and spinal cord-healing beads has led to the coining of the phrase "uber-developed" nation.

The most watched video ever is currently "Welcome to the Future," an introduction video created by Wakanda's recently established Ministry of Foreign Affairs.

Thus, The "Wakanda speech," six weeks have passed, and the world is still in shock.

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Answer: Through photosynthesis carbon dioxide and water is converted to glucose which is more ordered.

Explanation:

Besides that initial consideration there is solar energy being added to the reaction which might be worth noting.

More important to note is that organic molecules/compounds such as glucose are higher in order compared to inorganic molecules/compounds such as water.

Answer:

3.11 mol/kg

Explanation:

Molality M = number of moles of solute, n/mass of solvent, m

To calculate the number of moles of glycerol (C₃H₈O₃) in 22.75 g of glycerol, we find its molar (molecular) mass, M',

So, M' = 3 × atomic mass of carbon + 8 × atomic mass hydrogen + 3 × atomic mass of oxygen

= 3 × 12 g/mol + 8 × 1 g/mol + 3 × 16 g/mol = 36 g/mol + 8 g/mol + 48 g/mol = 92 g/mol.

So, number of moles of glycerol, n = m'/M' where m' = mass of glycerol = 22.75 g and M' = molecular mass of glycerol = 92 g/mol

So, n = m'/M'

n = 22.75 g/92 g/mol

n = 0.247 mol

So, the molality of the solution M = n/m

Since m = mass of ethanol = 79.6 g = 0.0796 kg, substituting the value of n into the equation, we have

M = 0.247 mol/0.0796 kg

M = 3.11 mol/kg

So, the molality of the solution is 3.11 mol/kg.

Answer:

mercury has oxide yes

Explanation:

The chemical equation for mercury and oxygen reacting  to yield mercuric oxide is 2 Hg + O₂\(\rightarrow\) 2 HgO.

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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Answer: Volume required is 0.115 L or 115 ml

Explanation:

moles of \(NaHCO_3\) = \(\frac{\text {given mass}}{\text {Molar mass}}=\frac{1.30g}{84g/mol}=0.015mol\)

The balanced chemical equation is:

\(HCl+NaHCO_3\rightarrow NaCl+H_2CO_3\)

1 mole of \(NaHCO_3\) requires = 1 mole of HCl

Thus 0.015 mol of \(NaHCO_3\) requires = \(\frac{1}{1}\times 0.015=0.015\) mole of HCl

Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.

\(Molarity=\frac{n}{V_s}\)

where,

n = moles of solute

\(V_s\) = volume of solution in L

\(0.130=\frac{0..015}{V_s}\)

\(V_s=0.115L\)

Thus volume required is 0.115 l or 115 ml

Answer:

The Aluminium sample

Explanation:

From the question,

ΔQ of the iron = Cm(t₂-t₁)........................ Equation 1

Given: C = specific heat capacity of iron, m = mass of iron, t₁ and t₂ = initial and final temperature respectively.

Given: m = 175 g = 0.175 kg, t₂ = 21.5°C, t₁ = 99.7°C

Constant: C = 444 J/kgK.

Substitute into equation 1

ΔQ = 0.175(444)(21.5-99.7)

ΔQ = -6076.14 J

Similarly, for aluminium,

ΔQ' = c'm'(t₂-t₁)...................... Equation 2

Given: m' = 175 g = 0.175 kg,

Constant: 900 J/kgK

ΔQ' = 0.175(900)(21.5-99.7)

ΔQ' = -12316.5 J

Hence the aluminium sample undergoes the greater heat change

Answer:

Zinc (Zn) combines with hydrogen chloride (HCI) to form hydrogen gas(H2) and zinc chloride (ZnCl2).

\(\sf Zinc+Hydrogen\:Chloride \longrightarrow Hydrogen\:gas+Zinc\:Chloride\)

\(\sf Zn+HCL \longrightarrow H_2+ZnCl_2 \)

\(\sf Zn+2HCL\longrightarrow H_2+ZnCl_2 \)

Answer:

Explanation:

Answer is C

Answer:

water

. Of the compounds listed in the question, water has the highest percent mass of hydrogen.

Hope it helps

Answer:

x

Explanation:

The qualitative data required can only be obtained from table X.

A questionnaire is a document that could be used to obtain the views of other people regarding a matter. The questionnaire serves the purpose of helping us to gather qualitative data.

In this case, the qualitative data that Prolly wants to gather is to find out  if males or females have a more negative attitude towards rodents. She has ensured that this is a confidential questionnaire.

Looking at the four tables as we can see them from the image that is attached to the question, the qualitative data required can only be obtained from table X.

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I would say Phenolphthalein

Despite the fact that it was first challenging for me to determine whether a change was physical or chemical, this lesson provided me with the knowledge I needed.

This course has promoted a deeper comprehension of the universe and its guiding principles. Although it was originally difficult for me to tell whether a change was physical or chemical, this lesson gave me the knowledge I needed to know. Now that I know this, I can relate to other attributes, and I think my improved skill will be useful in future units as well.

The CPI, which measures inflation, ensures a healthy economy by keeping inflation rates low. But when the rate of inflation increases quickly, it may have adverse economic repercussions such as diminished purchasing power, higher interest rates, slower economic growth, and others.

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a)The total mass of the solution is 158.67 g

b)Owing to the fact that the temperature rose thus it dissolved exothermically.

Let us recall that an endothermic reaction is one in which heat is absorbed while the exothermic reaction is one in which heat is evolved.

Number of moles of the substance =  8.67 g/116.82 g/mol = 0.074 moles

Temperature change inside the calorimeter =  28.54 °C - 23.72 °C = 4.82°C

Let us recall that the total mass in the calorimeter is the mass the solute and that of the solvent. Hence the total mass can be given as; 8.67 g + 150.00 g = 158.67 g

The dissolution process is exothermic.

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Answer:

See explanation

Explanation:

From left to right, the oxides across period 3;

i) Period 3 oxides all appear white in colour. They are all crystalline solids and their melting points decrease from left to right.

ii) The volatility of period 3 oxides increases from left to right across the periodic table

iii) The metallic oxides on the right hand side adopt giant ionic structures. Silicon oxide which is in the middle of the period forms a giant covalent structure. Oxides of other elements towards the right hand side form molecular oxide structures.

iv) The acidity of oxides of period 3 increases from left to right. Metals on the left hand side form basic oxides while non-metals on the right hand side form acidic oxides. The oxide of aluminium in the middle is amphoteric.

v) The oxides of period 3 elements do not conduct electricity. However, the metallic oxides on the lefthand side conduct electricity in molten state. The non-metallic oxides on the right hand side are molecular hence they do not conduct electricity under any circumstance.

Explanation:

First, you need to balance the equation:

N2    +  3 H2   ====>    2  NH3

                  so three moles of H2   result in  2 moles of NH3

                               ratio of   3:2

How many moles of NH3 is 36.5 gm  ??

   Using periodic table NH3 mole weight = 14.007  + 3*1.008 =17.031 g/mole

     36.5 g / 17.031 g/mole = 2.14 moles  of NH3

Using the ratios above   3/2 = x / 2.14   shows x = 3.21 moles of H2 needed

Answer:

gases at room temperature.

Explanation:

Explanation:

There are two types of change in matter: physical change and chemical change. A physical change affects a substance’s physical properties, and a chemical change affects its chemical properties. Many physical changes are reversible (such as heating and cooling), whereas chemical changes are often irreversible or only reversible with an additional chemical change.

The given changes are classified as follows:

The physical changes are:

(a) melting of sodium chloride.

(c) evaporation of alcohol.

(d) dissolving of sugar in water.

The chemical changes are:

(b) rusting of iron.

(e) decomposition of water.

(f) tarnishing of silver.

(g) non-reactivity of helium.

No, alloy and gemstone are not the same type of solution.

An alloy is a mixture of two or more metals or a metal and another element. It is formed by combining different metallic elements to create a material with desired properties such as strength, durability, or resistance to corrosion. Examples of alloys include bronze (copper and tin), stainless steel (iron, chromium, and nickel), and brass (copper and zinc).

On the other hand, a gemstone is a mineral or a naturally occurring material that is cut and polished to be used in jewelry or decorative items. Gemstones are prized for their beauty, rarity, and often have unique optical properties such as color, clarity, and brilliance. Examples of gemstones include diamonds, rubies, emeralds, and sapphires.

While both alloys and gemstones can be materials used in various applications, they are fundamentally different in terms of their composition, formation, and purpose.

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Answer: No, alloy and gemstone are not the same type of solution. They are two different concepts related to materials.

Explanation:

Alloy: An alloy is a mixture of two or more elements, at least one of which is a metal. Alloys are created to enhance the properties of the constituent elements. By combining different metals, engineers can produce materials with specific characteristics such as increased strength, improved corrosion resistance, or better conductivity. Common examples of alloys include steel (a mixture of iron and carbon), brass (a combination of copper and zinc), and bronze (a blend of copper and tin).

Gemstone: A gemstone is a precious or semi-precious mineral, rock, or organic material that is cut and polished to be used in jewelry or ornamental objects. Gemstones are valued for their beauty, rarity, and sometimes metaphysical properties. Examples of gemstones include diamonds, rubies, emeralds, sapphires, amethysts, and many others. All are available on cabochonsforsale

While both alloys and gemstones involve mixing different materials, they serve very different purposes and have distinct characteristics. Alloys are primarily used to improve the properties of materials, while gemstones are valued for their aesthetic and decorative qualities.

There are approximately 6.022 × 10^23 atoms in 12 grams of Carbon-12 (12C).

The number of atoms in a given amount of a substance can be calculated using Avogadro's number, which represents the number of atoms or molecules in one mole of a substance. Avogadro's number is approximately 6.022 × 10^23.

Carbon-12 is a specific isotope of carbon, with an atomic mass of 12 atomic mass units (amu). One mole of Carbon-12 has a mass of 12 grams. Since one mole of any substance contains Avogadro's number of particles, in the case of Carbon-12, it contains 6.022 × 10^23 atoms.

Therefore, if we have 12 grams of Carbon-12, which is equal to one mole, we can conclude that there are approximately 6.022 × 10^23 atoms in this amount of Carbon-12.

In summary, 12 grams of Carbon-12 contains approximately 6.022 × 10^23 atoms. Avogadro's number allows us to relate the mass of a substance to the number of atoms or molecules it contains, providing a fundamental concept in chemistry and enabling us to quantify and understand the microscopic world of atoms and molecules.

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6.02 x \(10^{20\) formula units of MgCl₂ is equal to 0.1 moles of MgCl₂.

To convert formula units of MgCl₂ to moles of MgCl₂, we need to use Avogadro's number, which relates the number of formula units to the number of moles.

Avogadro's number (NA) is approximately 6.022 x 10^23 formula units per mole.

Given that we have 6.02 x 10^20 formula units of MgCl₂, we can set up a conversion factor to convert to moles:

(6.02 x 10^20 formula units MgCl₂) * (1 mol MgCl₂ / (6.022 x 10^23 formula units MgCl₂))

The formula units of MgCl₂ cancel out, and we are left with moles of MgCl₂:

(6.02 x 10^20) * (1 mol / 6.022 x 10^23) = 0.1 mol

Therefore, 6.02 x 10^20 formula units of MgCl₂ is equal to 0.1 moles of MgCl₂.

It's important to note that this conversion assumes that each formula unit of MgCl₂ represents one mole of MgCl₂. This is based on the stoichiometry of the compound, where there is one mole of MgCl₂ for every one formula unit.

Additionally, this conversion is valid for any substance, not just MgCl₂, as long as you know the value of Avogadro's number and the number of formula units or particles you have.

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Answer:

A pure substance is a form of matter that has a constant composition and properties that are constant throughout the sample.

Explanation:

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One possible reason for cooler air temperatures in Christchurch during El Niño years is the shift in atmospheric circulation patterns.

During El Niño years, Christchurch may experience cooler air temperatures due to several factors associated with the El Niño phenomenon.

El Niño is characterized by the abnormal warming of the surface waters in the eastern tropical Pacific Ocean, which has global climatic implications. While El Niño is primarily associated with changes in oceanic conditions, its effects can extend to atmospheric patterns, leading to altered weather patterns and temperature variations.

One possible reason for cooler air temperatures in Christchurch during El Niño years is the shift in atmospheric circulation patterns. El Niño can disrupt the normal global atmospheric circulation, resulting in changes in the positioning and intensity of weather systems.

This can lead to the advection of cooler air masses from the south or southeast towards Christchurch, resulting in cooler temperatures.

Another factor is the influence of El Niño on regional rainfall patterns. El Niño often leads to drier conditions in the South Island of New Zealand, including Christchurch.

Reduced cloud cover and less moisture in the air can contribute to cooler temperatures as there is less insulation from the sun's radiation and less evaporative cooling. Additionally, the absence of significant rainfall can result in less moisture in the soil, leading to cooler conditions as less energy is used for evaporation.

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Answer:

The answer is YES

The value is \(S = 110 \ g/L\)

Explanation:

From the question we are told that

The volume of the sample taken is v = 13.0 mL

The temperature is \(T = 16^oC\)

The mass of the sample is \(m = 0.143 g\)

Generally the solubility of the substance X is mathematically represented as

\(S = \frac{m}{V}\)

=>        \(S =  \frac{0.143  }{13.0}\)

=>         \(S = 0.011 \  g/mL\)

=>         \(S = 110 \  g/L\)

The basic units of the human body are called cells, and they carry out specialized tasks to keep the body alive. Cells in a city might be compared to people who perform particular duties and contribute to the general efficiency of the city.

Organizational hierarchy is built up from lower levels. Consequently, molecules combine to create molecules, molecules create cells, cells create tissues, tissues create organs, organs create organ systems, and organ systems create beings. The body's next level of organisation. A tissue is made up of related cells with a common purpose. Human tissues can be divided into four categories: epithelial, muscular, nerve, and connective.

The major levels of organisation in the body, from the most basic to the most complex, are atoms, molecules, organelles, cells, tissues, organs, organ systems, and the human body.

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Answer:

the theoretical yield of aspirin from 1.629 g of salicylic acid is 2.13 g.