Help, Kinda struggling here

The products Rosa recorded in the last row of the table should be: 2LiCl + 3O₂.

The type of reaction which Rosa did is a decomposition reaction which involves one compound that yields to more than one (or usually two) product. To determine the product, we can deduce that it has to contain elements of Li, Cl and O₂. So, from the options, the answer is 2LiCl + 3O₂.

A decomposition reaction can be described as a chemical reaction in which one reactant breaks down into two or more products. Generally, decomposition reactions need energy input.

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Answer:

So the chemist can produce 418.7 grams of calcium phosphate.

Explanation:

We can start the problem by using the balanced chemical equation for the reaction and the stoichiometry to determine the amount of calcium phosphate that can be produced.

2K3PO4 (aq) + 3CaCl2 (aq) → Ca3(PO4)2 (s) + 6KCl (aq)

From the balanced equation, we can see that for every 2 moles of potassium phosphate (K3PO4) reacted, 1 mole of calcium phosphate (Ca3(PO4)2) is produced.

We are given that the chemist has 750.0 mL of a 1.8 M solution of potassium phosphate. We can convert this information into moles by using the formula:

moles = concentration x volume

moles = 1.8 M x (750.0 mL) / 1000 mL/L = 1.35 moles

To find the number of grams of calcium phosphate that can be produced we can use the molar mass of calcium phosphate which is 310.18 g/mol

grams = moles x molar mass

grams = 1.35 x 310.18 = 418.7 grams

So the chemist can produce 418.7 grams of calcium phosphate.

The negatively charged electron in the plum pudding model, however, is smaller than an atom and is negatively charged.

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So the plum pudding model is different from the hard-sphere model of the atom because in the hard sphere model of the atom, the atom is the smallest division of matter.

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This is based on the process of chemical decomposition due to which experiment shows the red substance.

Compounds with an oxygen–oxygen single bond are categorised as peroxides. Hydrogen peroxide represents the simplest type of this group of chemicals.

It is characterized by its tendency to decompose, caused by the nature of its unstable peroxide bond. It must be stored with a stabilizer, such as acetanilide or similar organic materials.

The solution is not flammable, regardless of its concentration. However, hydrogen peroxide is a strong oxidizing agent, due to its chemical structure and unpaired electrons.

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Many people in the early days of science thought that combustible stuff was made of a component called phlogiston that this substance was emitted during the burning of combustible things.

A combustible material is what?

Combustible materials are those that, when exposed to fire or heat, will ignite, burn, sustain combustion, or produce flammable gases in the form and circumstances anticipated for their application. Combustible materials include rubber, plastics, rubberized materials, and wood.

What gases are combustible?

A gas that really can ignite inside the air or with oxygen is said to be combustible. Gases like hydrogen, methane, propane, and iso-butane are examples of flammable gases. In the existence of an ignition source, a mixture containing a particular amount of flammable oxygen and gas will explode. The most common reason for gas explosion accidents is combustible gas.

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Answer:

Plants are a resource of food and are also responsible for turning CO2 into O2

Explanation:

A Lewis Structure is a significantly condensed illustration of the valence shell electrons of a molecule. It serves to illustrate how the electrons surround the character atoms of a molecule.

Atoms come together to form molecules. The two atoms a water molecule are either two hydrolysis (H) atom but one oxid (O) atom. As a result, water is sometimes shortened as H2O. One teaspoon of liquid contains billions of water molecules.

A molecule is a group of three or maybe more atoms connected by chemical bonds. A composite is a mixture created by the chemical fusion of a number of distinct types of components.

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The water in the 5-gallon jug will fill 160 glasses.

According to the issue, a glass carries 4 ounces of water while a jug holds 5 gallons. We must convert the jug's volume from gallons to ounces and divide it by the volume of glass in order to determine how many glasses can be filled from it.

The water in the jug needs to be converted from gallons to ounces first. A gallon contains 128 ounces, hence 5 gallons of water equal 5×128 = 640 ounces.

The amount of water in the glass is then divided by the amount of water in the jug. If a glass holds four ounces, then 160 glasses can be filled from the jug, or 640 divided by four.

It's vital to note that we are converting between units in this problem using the rule that 1 gallon = 128 ounces. This conversion factor is based on the units of a gallon and an ounce, which are both common measurements.

We can simply convert gallons to ounces using this conversion factor, which enables us to perform the calculations required to get the solution.

In conclusion, by dividing the volume of the 5-gallon jug of water by the volume of glass, 160 glasses can be filled from it. To accomplish this, we must use a conversion factor to convert water measured in gallons to ounces.

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An umbrella is placed in a drink holding a volume of punch equal to 7 mL. The height of the punch rose to 10 mL. If the mass of the umbrella was 27 g, the Density of the umbrella is 9 g/mL.

Given that :

The mass of the umbrella = 27 g

The volume of the umbrella :

= height of the punch rose - volume of the punch

= 10 mL - 7 mL

= 3 mL

The density of the umbrella is give as :

Density = mass / volume

Density = 27 g / 3 mL

Density = 9 g/mL

Thus, the density of the umbrella is 9 g/mL.

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20 grams of salt can be accurately weighed using an electronic balance. For measuring, we can use s filter paper or other thin sheets to take the salt.

An electronic balance is a used to weigh substances. Solid as well as liquids substances can be accurately weighed using an electronic balance. It is more accurate and easy to use in comparison with with the conventional balances.

Powder samples can be easily weighed out using electronic balances. First we have to tier the weight of the container or the paper on which the substance to be weighed is taken.

20 g of salt can  be easily measured out using an electronic balance. Using this device we can take measurements with two or four decimal places as well.

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The scale contains values from 0, which is the most acidic, to 14, which is an agricultural product that, though not always by weight majority, is the distinguishing or unique element in a cottage food product.

A cuisine is a type of food distinguished by unique materials, preparation methods, and meals, and it is frequently related to a particular culture or geographical area. Dishes that are specific to a place are made possible by regional food preparation methods, customs, and ingredients.

To assess if a food product is a good decision or not, the ingredient list is the best resource you have at your disposal. In actuality, there is no other way to tell if a product is derived from actual food or if it also contains additives, added sugars, and vegetable oils.

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Answer: 2.7099 × 10²²  molecules

Explanation:

1 mole of H₂O₂ = 6.022 × 10²² molecules of  H₂O₂

No . of molecules in 0.45 moles of  H₂O₂ = 0.45 × 6.022 × 10²²

                                                                      =  45/ 100 × 6.022 ×  10²²  

                                                                       = 270.99 /100 ×  10²²

                                                                       = 2.7099 × 10²²  molecules

∴ The no. of molecules present in 0.45 moles of H₂O₂ are 2.7099 × 10²²  molecules .

The number of atoms that would make 7.31 moles of potassium is 4.40 × 10²⁴ atoms.

The number of atoms in a substance can be calculated by multiplying the number of moles in the substance by Avogadro's number as follows:

According to this question, there are 7.31 moles of pottasium. The number of atoms can be calculated as follows:

no of atoms = 7.31 moles × 6.02 × 10²³

no of atoms = 4.40 × 10²⁴

Therefore, 4.40 × 10²⁴ atoms is the number of atoms in pottasium.

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Equipment not kept in your assigned lab drawer is called: Shared equipment

Departmental equipment are the set of things that is to be used by all the people of department and not necessarily have to be a research equipment. This kind of equipment mostly include some simple machineries and all purpose equipment that can also be used out of the laboratory.

Lab equipment are strictly research related things but can be used for various projects and not strictly used for a particular project. This kind of equipment can be used by research scholars as well as undergraduate or postgraduate student group.

Community equipment are also research related thing but unlike Lab equipment it is used by a group of students or research scholars who are involved in same project or similar kind of project and can't be shared commonly among all the students.

A shared equipment is research related thing but unlike Community equipment it is not shared among the scholars of similar kind of different projects. Shared equipment is assigned for a single group for a particular project and can be shared among the group members only. No members of the group can acquire it all alone.

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Answer: Unused glucose is stored mainly in the liver as glycogen.

Explanation: The body breaks down most carbohydrates from the foods we eat and converts them to a type of sugar called glucose. Glucose is the main source of fuel for our cells. When the body doesn't need to use glucose for energy, it stores it in the liver and muscles. This stored form of glucose is made up of many connected glucose molecules and is called glycogen. When the body needs a quick boost of energy or when the body isn't getting glucose from food, glycogen is broken down to release glucose into the bloodstream to be used as fuel for the cells.

When the body doesn't need to use glucose for energy, it stores it in the liver and muscles.

The empiric formula to that compound is S₃H₄. Empirical formula is the proportion of the element that is available in a compound.

To find the formula for that compound, we have to know the mole ration of its atoms. As per given data only mass of s = 96% and h = 4%. We have to assume mass of the compound as x. Then calculate the ratio as follow:

S mole value : H mole value = (96x : 32.07) : (4x : 1.008)

S mole value : H mole value = 3x :  4x

Let divide the ratio with x

S mole value : H mole value = 3 : 4

After we get the ration, make the empiric formula based on it where the result:

S(mole value)H(mole value) = S₃H₄

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Answer:

[tex]\huge\boxed{\sf 0.26 \ atm}[/tex]

Explanation:

Given that,

Atmospheric pressure = 199 mm Hg

So,

Pressure = 199/760 atm

[tex]\rule[225]{225}{2}[/tex]

Instant hot and cold packs are found in many common stores and work when two substances react. Depending on the substances that react, the reaction either absorbs heat or gives off heat. The enthalpy of a hot pack is  negative because the reaction gives off heat. If The enthalpy of a hot pack is  positive because the reaction absorbs heat.

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Answer: The correct answer is d - None of the Above.

Explanation: Halogens have increasing electron affinity as their atomic numbers increase, while their ionization energy and electronegativity both decrease as atomic numbers increase.

a) The percentage abundance shows the amount of the isotope

b) The relative atomic mass is 122.5 amu

c) The Rutherford's model explained the planetary model of the atom.

We have to know that the elements that we are considering must be composed of isotopes. The isotopes of the elements that we have have the same atomic number but does not have the same mass number of the element that we are looking at here.

For us to get the relative atomic mass of the element X;

Relative atomic mass = Weighted average of all the isotopes

As such we have;

(121 * 0.432) + (123 * 0.531) + (129 * 0.0370)

52.27 + 65.31 + 4.773

=122.35 amu

The Rutherford model of the atom was one of the earliest among the models of the atom and it helped in the understanding of the atom.

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The electron configuration for a neutral atom of iron (Fe) is [Ar] 3d^6 4s^2

The electron configuration is a way of describing the arrangement of electrons in an atom. It is written by listing the various electron shells and the number of electrons in each shell. In the case of iron, it has 26 electrons, which are arranged in the following way:

1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^6

The first two electrons go in the 1s orbital. The next two electrons go in the 2s orbital, and then six electrons go in the 2p orbitals. The next two electrons go in the 3s orbital, six electrons go in the 3p orbitals, and the last two electrons go in the 4s orbital. The last 6 electrons go in the 3d orbitals. The electron configuration shows that the last six electrons in the 3d orbitals are the valence electrons which are responsible for chemical reactions.

The element Iron (Fe) belongs to the group 8 of the periodic table, the elements of this group are known as transition elements, which have an incomplete d-subshell.

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The way migration can be used by scientists to predict the trends in the size of the human population because Population growth occurs when immigration rates are higher than emigration rates; the opposite occurs when emigration rates are higher than immigration rates.

The rate of natural rise and the results of migration make up the rate of population expansion. As a result, a high rate of natural increase can be balanced by a high level of net in-migration, and a low rate of natural increase can be.

Migration will slow down aging in wealthy areas while speeding it up in underdeveloped ones. Most nations and regions that are seeing population declines do so primarily as a result of natural change (the distinction

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The First Germanic War and the crucial Battle of Anzio (378 CE), in which the Goths led by Fritigern overthrew Rome due to their oppression at the feet of Romans provincial rulers, were sparked

adjective. When you refer to someone or anything as provincial, you are expressing your disapproval of them because you find them to be monotonous and out of date. [disapproval] He made the choice to update the organization's rural image. Synonyms include local, exclusive, simpleminded, and uncultured More the opposites of provincial.

a member of or associated with a province. 2 pertaining to, or associated with, the provinces; regional. possessing beliefs and attitudes that are thought to be typical of country dwellers; simple or undeveloped; constrained.

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The percent yield of [tex]Fe_2S_3[/tex], according to the given parameters, would be  32.91%.

The percent yield of a particular product from a reaction is the actual amount of that product formed relative to the stoichiometric or theoretical amount that is supposed to be formed.

The percent yield of a reaction can be mathematically expressed as:

Percent yield = actual yield/theoretical yield x 100%

In this case:

Actual yield = 284 g

Theoretical yield = 863 g

Percent yield = 284/863 x 100

                      = 32.91%

In other words, the percent yield of [tex]Fe_2S_3[/tex] according to the given parameters would be 32.91%.

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Answer:

first answer is correct in accellus

Explanation:

A debate among scientists on how new species form is based on speciation.

Divergence explains how organisms on Earth are related because it shows how species are similar or different.

Genes play the role in diversity of carrying information that results in changes from one generation to the next.

Natural selection is part of evolution because it explains why attributes are either in existence or have gone extinct.

One of the main debates among scientists on how new species form centers around the concept of speciation. There are two main hypotheses for speciation: allopatric speciation and sympatric speciation.

Divergence is the process by which different populations or species of organisms evolve from a common ancestor over time. This process is responsible for the diversity of life on Earth. By studying the similarities and differences between different organisms, scientists can infer evolutionary relationships.

Genes are the basic units of inheritance that carry information from one generation to the next. They play a crucial role in creating diversity among organisms. The genetic diversity of a population is the result of mutations, gene flow, and genetic drift.

The theory of natural selection is one of the most important and widely accepted explanations for the diversity of life on Earth. It is the process by which certain traits become more or less common in a population over time, depending on their impact on the survival and reproduction of the organisms that possess them.

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Answer:

A. The green light is absorbed