In mass-volume and volume-mass calculations, all gases are
considered to be at standard
____
and pressure, also
referred to as
___


answer: temperature, stp
:P

Answer: 0.9704 moles of \(O_2\) will react when 0.6469 moles of water are formed.

Explanation:

The balanced chemical reaction is:

\(2H_2S+3O_2(g)\rightarrow 2SO_2+2H_2O\)  

According to stoichiometry :

2 moles of \(H_2O\) are formed from = 3 moles of \(O_2\)

Thus 0.6469 moles of \(H_2O\) are formed from =\(\frac{3}{2}\times 0.6469=0.9704moles\)  of \(O_2\)

Thus 0.9704 moles of \(O_2\) will react when 0.6469 moles of water are formed.

The spontaneous emission of nuclear radiation (particles and/or energy) from an unstable nucleus is called radioactive decay.

Radioactive decay is a natural process in which unstable atomic nuclei release particles and/or energy to attain a more stable state. It occurs in isotopes that have an imbalance of protons and neutrons in their nucleus.

The unstable nucleus undergoes radioactive decay to achieve a more balanced configuration. During radioactive decay, different types of radiation can be emitted, including alpha particles (helium nuclei), beta particles (electrons or positrons), and gamma rays (high-energy photons).

The emission of these particles and/or energy is spontaneous and occurs randomly over time, leading to the gradual transformation of the unstable nucleus into a more stable configuration. Radioactive decay plays a fundamental role in various applications, including radiometric dating and nuclear energy production.

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Explanation:

4.1 The Chemical Equation

LEARNING OBJECTIVES

Define chemical equation.

Identify the parts of a chemical equation.

A chemical reaction expresses a chemical change. For example, one chemical property of hydrogen is that it will react with oxygen to make water. We can write that as follows:

hydrogen reacts with oxygen to make water

We can represent this chemical change more succinctly as

hydrogen + oxygen → water

where the + sign means that the two substances interact chemically with each other and the → symbol implies that a chemical reaction takes place. But substances can also be represented by chemical formulas. Remembering that hydrogen and oxygen both exist as diatomic molecules, we can rewrite our chemical change as

H2 + O2 → H2O

This is an example of a chemical equation, which is a concise way of representing a chemical reaction. The initial substances are called reactants, and the final substances are called products.

Unfortunately, it is also an incomplete chemical equation. The law of conservation of matter says that matter cannot be created or destroyed. In chemical equations, the number of atoms of each element in the reactants must be the same as the number of atoms of each element in the products. If we count the number of hydrogen atoms in the reactants and products, we find two hydrogen atoms. But if we count the number of oxygen atoms in the reactants and products, we find that there are two oxygen atoms in the reactants but only one oxygen atom in the products.

What can we do? Can we change the subscripts in the formula for water so that it has two oxygen atoms in it? No; you cannot change the formulas of individual substances because the chemical formula for a given substance is characteristic of that substance. What you can do, however, is to change the number of molecules that react or are produced. We do this one element at a time, going from one side of the reaction to the other, changing the number of molecules of a substance until all elements have the same number of atoms on each side.

To accommodate the two oxygen atoms as reactants, let us assume that we have two water molecules as products:

H2 + O2 → 2H2O

The 2 in front of the formula for water is called a coefficient. Now there is the same number of oxygen atoms in the reactants as there are in the product. But in satisfying the need for the same number of oxygen atoms on both sides of the reaction, we have also changed the number of hydrogen atoms on the product side, so the number of hydrogen atoms is no longer equal. No problem—simply go back to the reactant side of the equation and add a coefficient in front of the H2. The coefficient that works is 2:

2H2 + O2 → 2H2O

There are now four hydrogen atoms in the reactants and also four atoms of hydrogen in the product. There are two oxygen atoms in the reactants and two atoms of oxygen in the product. The law of conservation of matter has been satisfied. When the reactants and products of a chemical equation have the same number of atoms of all elements present, we say that an equation is balanced. All proper chemical equations are balanced. If a substance does not have a coefficient written in front of it, it is assumed to be 1. Also, the convention is to use all whole numbers when balancing chemical equations. This sometimes makes us do a bit more “back and forth” work when balancing a chemical equation.

Answer:

or ghettoise, verb. (transitive) to confine or restrict to a particular area, activity, or category.

If two surface water types with the same density but different salinities and temperatures mix, the resulting water will be denser than both the surface water types.

Areas under warm and high salinity surface water with an appreciable depth, the temperature and salinity decreases with depth and internal vertical mixing processes occur despite stability of the water column. Eventually, this phenomenon is caused by the ability of the sea water to lose or gain heat by conduction and loss or gain of salt takes place by diffusion. This causes the density of the moving water to change directions.

Salt water mixes over limited depths and forms homogenous layers.

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Answer:

c. Gas particles don't interact

Explanation:

Ideal gas particles do not interact with each other.

The gas molecules do not interact with each other except for colliding with each other. Gases expand to completely fill a container; they would not if they were attracted to each other. That being said, they obviously still do, as a result of Dalton's Law.

The mass of the solid of density 1.75 g/ mole is 116.77g. This is calculated using the expression for density.

Density is defined as the mass per unit of volume of the substance. The symbol used for density is ρ. Basically density is defined as mass divided by volume.

Density = mass/ volume

mass of the liquid = 21.0 g

density of the liquid = 0.865 g/ mole

volume of liquid = mass / density

                            = 21.0 g / 0.865g/ mole

                            = 24.27 ml

The total volume of the solid and liquid together is 91.0 ml.

Total volume = volume of solid + volume of liquid

volume of solid =  total volume - volume of liquid

                           = 91.0ml - 24.27 ml

                           = 66.73 ml

density of the solid= 1.75 g/ mole.

mass = density * volume

         = 1.75 g /mole * 66.73 ml

         = 116.77 g

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Answer:

78.5 mL

Explanation:

Step 1: Given data

Mass of the lead fishing weight: 39.7 g

Volume of water in the graduated cylinder: 75.0 mL

Step 2: Calculate the volume of the lead fishing weight

The density of lead is 11.34 g/mL.

39.7 g × (1 mL/11.34 g) = 3.50 mL

Step 3: Calculate to what volume will increase the water level

The final volume of water will be equal to its initial value plus the volume displaced by the lead fishing weight.

V = 75.0 mL + 3.50 mL = 78.5 mL

Answer:

halogen

Explanation:

group 17 contains halogens

Answer:

The group 17 falls int he halogen category the element most likely Fluorine Chlorine Bromine Tennessine

Explanation:

Answer:

Rb: [Kr] 5S¹

Explanation:

Rubidium is the chemical element with the symbol Rb and atomic number 37.

The components of black tea that contribute to its color are the polyphenolic compounds called theaflavins and thearubigins.

These compounds are formed during the oxidation process that black tea undergoes after it has been harvested. Theaflavins are yellow to orange in color, while thearubigins are reddish-brown.

The longer the oxidation process, the more theaflavins and thearubigins are produced, which contributes to the darker color of the tea. Additionally, the amount of these compounds can vary based on the tea variety, growing conditions, and processing methods.

Theaflavins and thearubigins not only contribute to the color of black tea but also to its flavor and aroma, giving it a unique taste and fragrance.

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Answer:

Increasing the temperature

Increasing particle size

Explanation:

Increasing the temperature allows for particles and molecules to move faster (because there is an increase in energy) and allows for more collisions.

∴ Increasing the temperature would be an answer.

Increasing the particle size allows for more surface area and a greater chance for particles to collide with each other.

∴ Increasing particle size would be an answer.

Topic: AP Chemistry

Unit: Kinetics

Seasons on the Earth can be defined as the period or time of year which is characterized by several factors like weather, and temperature occurring. The tilt of the Earth's axis causes the seasons.

Earth has four types of seasons namely - Summer season, Rainy season, Autumn season, and Winter season.

Summer season starts in the month of April and lasts till the month of June.  It is usually the hottest season out of all four seasons. The days are longer and the nights are shorter in this season.

The second season is the Rainy season which arrives in the month of June and last till the month of September. This season is the Wet season of the year because in rainy seasons there are rain showers all over. It is also known as the Monsoon season. As the monsoon arrives, there is relief from high daytime temperatures and night temperature also drops. Monsoons are important for vegetation to grow and also important for human beings.

The third season is the Autumn season which begins after the monsoon season and ends before the winter season. This is in the month of September till the end of October. The length of day and night are equal.

The last season on the Earth is the Winter season. This season occurs after the Autumn season and before the arrival of Spring. Winter is the coldest season of the year. The length of nights is longer than the length of days in the winter season.

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Answer:

(o) Al + NaOH + H2O -NaAlO2 + H2.

When aluminum oxide Al 2 O 3 reacts with sodium hydroxide solution, it forms sodium aluminate and water H 2 O . This reaction takes place at a temperature of 900 - 1100 ° C

49 becase you multilpy it

Explanation:

To estimate ΔH for the reaction H2N-NH2+Cl-Cl->2H2-N-Cl, we first need to write the balanced equation:
H2N-NH2 + Cl-Cl -> 2H2-N-Cl. Therefore, the estimated ΔH for the reaction H2N-NH2+Cl-Cl->2H2-N-Cl is 3332 kJ/mol.

To estimate ΔH for the reaction H2N-NH2+Cl-Cl->2H2-N-Cl, we first need to write the balanced equation:
H2N-NH2 + Cl-Cl -> 2H2-N-Cl. Next, we need to identify the bonds broken and formed in the reaction. In the reactants, there are two N-N single bonds and two Cl-H single bonds. In the products, there are two N-Cl single bonds and four H-H single bonds.
Breaking two N-N single bonds requires 2 × (bond energy of N-N) = 2 × 163 kJ/mol = 326 kJ/mol. Breaking two Cl-H single bonds requires 2 × (bond energy of Cl-H) = 2 × 431 kJ/mol = 862 kJ/mol. Forming two N-Cl single bonds releases 2 × (bond energy of N-Cl) = 2 × 200 kJ/mol = 400 kJ/mol. Forming four H-H single bonds releases 4 × (bond energy of H-H) = 4 × 436 kJ/mol = 1744 kJ/mol.
ΔH = (energy required to break bonds in reactants) + (energy released by forming bonds in products)
ΔH = (326 kJ/mol + 862 kJ/mol) + (400 kJ/mol + 1744 kJ/mol)
ΔH = 3332 kJ/mol
Therefore, the estimated ΔH for the reaction H2N-NH2+Cl-Cl->2H2-N-Cl is 3332 kJ/mol.
(Note: the term "n2h4 i" and the phrase "n single bonded left" were not used in the question, so I did not include them in my answer.)

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The melting points of an impure sample is a) The two melting points are the same but the impure sample has a broader range.

Impure materials generally tend to have a barely decrease melting factor than the natural substance, and a broader melting temperature range. Pure materials may be diagnosed through evaluating the melting factor located withinside the test with posted reference records of what the melting factor need to be. Impurities, even if found in small amounts, commonly decrease the melting factor and expand the melting factor range. A huge melting factor range (extra than 5°C) commonly shows that the substance is impure; a slim melting factor range (O. 5-2°C) commonly shows that the substance within reason natural.

Thus, option a is the correct choice.

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The term "catalyst" best describes the role of platinum in the system.

Let us explore the role that platinum plays as a catalyst. Catalysts are defined as substances that speed up the rate of chemical reactions without changing their own mass or chemical properties in the process.

The amount of energy required to activate a process is reduced when catalysts are added. It is stated in the question that if the system incorporates platinum, then the amount of energy that is required is going to be lower. Therefore, platinum is functioning as a catalyst in this situation because it is lowering the required activation energy of the reaction.

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You can see that Ms and Vs correspond to the stock solution, whereas Md and Vd corresponds to the dilute solution. The word 'M' means concentration and 'V' means volume. We want to know what is the volume of the stock solution (Vs). So, we have to use the following formula:

Where C is concentration and V volume. We can write this formula in our terms, like this:

Let's solve for 'Vs':

The given data is:

So, replacing these values in the last formula, we're going to obtain:

The answer is that we have 19.2 milliliters (mL) in the stock solution.

The total pressure of the gas is calculated as 849 mmHg.

The term partial pressure is the pressure that is exerted by an individual gas in a mixture of gases.

In this case, the partial pressures of hydrogen and water are 789 mmHg and  60 mmHg respectively.

Thus, the total pressure of the gas =  60 mmHg +  789 mmHg = 849 mmHg.

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Answer:

\(\boxed {\boxed {\sf D. \ 4}}\)

Explanation:

The neutrons in an element can be found by subtracting the atomic number from the atomic mass.

\(\sf N=atomic \ mass- atomic \ number\)

Li is the symbol for lithium.

This element has an atomic mass of 6.941, which we can round to 7.

Lithium's atomic number is 3.

\(\sf atomic \ mass =7 \\atomic \ number =3\)

\(\sf N=7-3\)

\(\sf N= 4\)

Lithium has a total number of 4 neutrons.

Answer:

D)4

Explanation:

Lithium is an alkali metal with the atomic number = 3 and an atomic mass of 6.941 g/mol. This means that lithium has 3 protons, 3 electrons and 4 neutrons (6.941 - 3 = ~4).

Answer:

Explanation:Balance equation:

2 FeBr3 + 3 Na2S → Fe2S3 + 6 NaBr

The remaining moles of C is 5.01 moles while the remaining moles of F₂ is 0.

The reaction between carbon and Fluorine is given as;

C + 2F₂  -------> CF₄

1  :    2                1

from the reaction above,

2 moles of F₂ requires 1 mole of C

7.88 mole of  F₂ will require:    7.88/2 = 3.94 moles of C and 3.94 moles of CF₄.

The remaining moles of C = 8.95 - 3.94 = 5.01 moles while the remaining moles of F₂ is 0.

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Answer:

a

Explanation:

i hope i am right

The molecule that has two lone pairs of electrons is B. \(NH_{3}\).

Ammonia has a central nitrogen atom bonded to three hydrogen atoms and one lone pair of electrons. The lone pair of electrons is located in a region of space that is not occupied by any other atom or bond. This region of space is called the electron cloud or electron pair. The lone pair of electrons in ammonia is important because it affects the shape and reactivity of the molecule.

The lone pair of electrons repel the bonding pairs of electrons, causing the molecule to have a trigonal pyramidal shape. This shape allows for the molecule to have a dipole moment, which means that it has a positive and negative end.

The lone pair of electrons also makes ammonia a Lewis base, which means that it can donate a pair of electrons to another molecule or ion. This property of ammonia makes it an important component in many chemical reactions and processes, such as the production of fertilizers and the formation of amino acids in living organisms.

In summary, \(NH_{3}\) or ammonia has two lone pairs of electrons that affect its shape, reactivity, and Lewis basicity. Understanding the role of lone pairs of electrons is important in understanding the behavior of molecules and their interactions with other substances. Therefore, Option B is correct.

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Answer:

OH-

Explanation:

it's consists of an oxygen and hydrogen atom held together by a covalent bond and carries a negative electric charge

Answer:

Region one because an area that has contour lines close together means that the area is steep. but in region ones case it has no contour lines meaning the area is flat.

Answer:

A. 1

Explanation:

Answer:

huh I can't understand

Explanation:

what are your language bro