potassium dichromate, k2cr2o7, is used in tanning leather, decorating porcelain, and water proofing fabrics. calculate the number of chromium atoms in 78.82 g of k2cr2o7..

Therefore, 12.8 cm3 of ammonia would be produced by the reaction when 6.4 cm3 of nitrogen is consumed.

To determine the volume of ammonia produced, we need to consider the balanced chemical equation and the stoichiometry of the reaction. Since the chemical equation is not provided, I'll assume a balanced equation for the reaction of nitrogen (N2) with hydrogen (H2) to form ammonia (NH3):

N2(g) + 3H2(g) → 2NH3(g)

According to the balanced equation, 1 mole of nitrogen reacts with 3 moles of hydrogen to produce 2 moles of ammonia. From the given information, we know that 6.4 cm3 of nitrogen (N2) is consumed.

To calculate the volume of ammonia produced, we need to use the stoichiometric ratio between nitrogen and ammonia. From the balanced equation, we can see that the ratio is 1:2. Therefore, for every 1 cm3 of nitrogen consumed, 2 cm3 of ammonia will be produced.

Using this ratio, we can calculate the volume of ammonia produced as follows:

Volume of ammonia = (Volume of nitrogen consumed) × (2 cm3 of ammonia / 1 cm3 of nitrogen)

Volume of ammonia = 6.4 cm3 × 2 cm3/cm3

Volume of ammonia = 12.8 cm3

Therefore, 12.8 cm3 of ammonia would be produced by the reaction when 6.4 cm3 of nitrogen is consumed.

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When a nucleus emits an alpha particle, the mass number of the nucleus decreases, and its atomic number also decreases.

Therefore, the correct answer is: (c). The mass number decreases and its atomic number increases.

The nuclei are incredibly tiny and dense. They are 10 thousand times smaller than an atom and have more than 99.9% of its mass! Protons, which have a positive charge, and neutrons, which have no electrical charge, make up the nucleus.

When a nucleus emits an alpha particle, the mass number of the nucleus decreases, and its atomic number also decreases.

An alpha particle is composed of two protons and two neutrons, which is equivalent to a helium nucleus (He²⁺). When an alpha particle is emitted from a nucleus, the mass number decreases by 4 (as the alpha particle has a mass of 4 atomic mass units) and the atomic number decreases by 2 (since the nucleus loses two protons).

Therefore, the correct answer is:

c. The mass number decreases and its atomic number increases.

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Answer:

Cells have many structures inside of them called organelles. These organelles are like the organs in a human and they help the cell stay alive. ... Mitochondria are the power house of the cell and provide the cell with energy. Both plant and animal cells have mitochondria.

Explanation:

Answer:

B, Pure substance

Explanation:

Water, is a pure substance, a compound made of hydrogen and oxygen. Although water is the most abundant substance on earth, it is rarely found naturally in its pure form. Most of the time, pure water has to be created. Pure water is called distilled water.

Answer:

c. alcohol

Explanation:

Alcohol is -OH

Ether is -OR

Ester is O=C-OR

Aldehyde is O=C-H

- Only alcohol fits

Alcohol is the type of organic compound is represented by the structural formula.

This can be defined as the type of organic compound that carries at least one hydroxyl functional group (−OH) bound to a saturated carbon atom.

The hydroxyl group(OH) is attached to a Carbon atom in the diagram which depicts features of an Alcohol.

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Answer:

Using blue and red litmus paper.

Explanation:

if we test all the solutions with blue and red litmus paper, we will know which solution is water and which solution is not water because blue and red litmus paper determined the pH of the solution. The pH of the water is neutral so it can't change its colour while on the other hand, the other solution change their colour due to acidic or basic nature of the solution so in this way we can determine the chemicals in the solution without tasting it.

A polar covalent bond can best be described as a bond where electrons are unequally shared, resulting in more electrons orbiting certain atoms than others.

A covalent bond is a type of chemical bond that is formed when two non-metal atoms share their valence electrons. When the shared electrons are not shared equally, a polar covalent bond is formed.

In a polar covalent bond, electrons are drawn closer to the more electronegative atom, causing partial negative charges to arise on the more electronegative atom and partial positive charges to arise on the less electronegative atom.

Hence, a polar covalent bond can best be described as a bond where electrons are unequally shared, resulting in more electrons orbiting certain atoms than others.

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A polar covalent bond is a type of covalent bond where electrons are unequally shared due to differences in electronegativity. It leads to a slight charge difference, forming polar molecules with regions of different charges, like in water molecules.

A polar covalent bond is a type of chemical bond, particularly a type of covalent bond, where electrons are unequally distributed between the atoms involved. This unequal distribution of electrons, caused by differences in electronegativity, leads to a slight charge difference. Consequently, partially positive atoms within one molecule attract the partially negative atoms of other molecules, hence forming polar molecules with regions of different charges.

For example, the bond between hydrogen and oxygen atoms in a water molecule is a polar covalent bond. In this case, the shared electrons spend more time near the oxygen nucleus due to its higher electronegativity. As a result, the oxygen atom has a partial negative charge (δ-), whereas the hydrogen atoms have a partial positive charge (δ+).

The type of bond - whether nonpolar or polar covalent - is determined by a property of the atoms named electronegativity, a measure of an atom's ability to attract electrons toward itself. The larger the difference in electronegativity, the more polarized the electron distribution, meaning a larger partial charge on the atoms.

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\(F_{2}\) and \(Cl_{2}\) are gases but \(Br_{2}\) is a liquid and \(I_{2}\) is a solid.

Each substance's molecules are drawn to one another by dispersion (London) intermolecular forces. The equilibrium between the kinetic energy of the molecules and their intermolecular attractions determines whether a substance is solid, liquid, or gas.

The electrons in fluorine are firmly bound to the nuclei. The London dispersion forces are comparatively weak because the electrons have little opportunity to stray to one side of the molecule.

The electrons are farther away from the nuclei when we transition from fluorine to iodine, allowing the electron clouds to more easily distorted. The forces of London's dispersion get ever greater.

The molecules will all become solids at a low enough temperature. They will all become gases if the temperature is high enough. Fluorine and chlorine are only gases between \(7^{0}\)C and \(59^{0}\)C, but bromine and iodine are solids at all other temperatures.

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Giant molecules are also referred to as macromolecules and polymers when numerous molecules are combined. These atoms are arranged in a three-dimensional structure and are joined by covalent bonds.

A giant molecule, also known as a macromolecule, is a usually large molecule crucial to biophysical processes, such as a protein or nucleic acid. It is made up of many atoms that are covalently bound. Large non-polymeric molecules including lipids and macrocycles, as well as biopolymers, are the most prevalent macromolecules in biochemistry. In addition to synthetic fibers, giant molecules can also be found in research materials like carbon nanotubes.

Different experts use different terminology for giant molecules. For instance, in biology, giant molecules refer to the four immense molecules that make up living things, while in chemistry, it refers to aggregates of two or more molecules that are held together by intermolecular forces rather than covalent bonds yet that is difficult to dissolve apart. The term giant molecule is frequently referred to as high polymer in British English.

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Answer:

The bond order is 1.091

Explanation:

there really is no explanation.

The equation of the combustion reaction is; C3H7OH(l)+92O2(g)→3CO2(g)+4H2O(g) .

The term combustion has to do with the process by which a substance can be burnt in oxygen. We have to note that the reaction is an oxidation reaction as there is an increase in the oxidation number of the carbon in the isopropanol.

Now, the process of the oxidation of the isopropanol would give rise to the formation of carbon dioxide, water, and heat . The equation of the reaction is seen to be; C3H7OH(l)+92O2(g)→3CO2(g)+4H2O(g) .

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Answer:

Chemical Nomenclature?

Explanation:

Explanation:

Observe that the greater the time over which the collision occurs, the smaller the force acting upon the object. Thus, to minimize the effect of the force on an object involved in a collision, the time must be increased.

Chemistry is the term for the branch of science which students the atoms ( i.e., smallest unit of matter) and molecules (combination of atoms).

Chemistry is a branch of science that studies matter, that is, anything that has mass and occupies space, and how matter changes under the influence of various energies, environments, and conditions. Atoms are the basic building blocks of chemistry. The smallest unit that can divide matter without releasing charged particles. It is also the smallest unit of matter that has the properties of a chemical element. Theory of atoms was propsed by Dalton in 19th century. It was the first theory of atom and it is called atomize.

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Answer:

The different types of storms are hailstorms, ice storms, snowstorms, thunderstorms, wind storms, hurricanes, and tornadoes.

Explanation:

Answer:

30 moles of CO₂

Explanation:

Answer:

158.8g

Explanation:

178.8-20=158.8

Answer:

Yttrium, Carbon, Iodine

Explanation:

Y stands for Yttrium

C stands for Carbon

I stands for Iodine

and 3 stands for 3 Iodine atoms

↪ Hello miss "galaxyu035" here's your answer for the question you wrote.

Answer :

No, we cannot stir silver nitrate solution with a copper spoon because , copper is more reactive than silver. Thus,it would displace silver from the silver nitrate solution forming copper nitrate.

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Answer: A

Explanation:

Extreme weather events follow normal climate patterns.

Answer:

write down each element and what you need to know about it repeatedly, and it will burn into your brain

Explanation:

When OSHA uses a TLV (Threshold Limit Value) in regulations, the TLV becomes a mandatory PEL (Permissible Exposure Limit). This means that employers must ensure workers' exposure to the hazardous substance does not exceed the established PEL, which is based on the TLV. OSHA enforces these PELs to protect workers from potential health hazards in the workplace.

When OSHA uses a TLV in regulations, the TLV becomes a non-mandatory recommendation for occupational exposure limits. OSHA has established its own Permissible Exposure Limits (PELs) which are legally enforceable and mandatory. While OSHA may consider TLVs when establishing or revising PELs, the TLV does not automatically become a PEL. OSHA may also use other sources of information to establish or revise PELs. Additionally, OSHA does not require that TLVs be updated annually, although some organizations that establish TLVs may choose to update them on a regular basis.

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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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Answer:

1) mixture of elements

2) single compound

3) mixture of elements and compounds

Explanation:

1) there are two different elements in the diagram, which are not chemically combined together, so they are a mixture

2) two elements chemically combined together

3) there are different elements and compounds present

There are 62.48 grams in 1.42 moles of carbondioxide.

The mass of a substance can be calculated by multiplying the number of moles in the substance by molar mass.

Moles in chemistry is the International System of Units, the base unit of amount of substance i.e. the amount of substance of a system which contains exactly 6.022 × 10²³ elementary entities.

mass = no of moles × molar mass

According to this question, there are 1.42 moles of carbondioxide given. The mass of the gas can be calculated as follows:

molar mass of carbondioxide = 44g/mol

mass = 1.42 × 44 = 62.48g

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Answer:

44

Explanation:

(16 × 2) + (12 × 1)

so basically 32 plus 12 which equals 44