An irregular object with a mass of 18 kg displaces 2.5 L of water when placed in a large overflow container. Calculate the density of the object. (answer = 7.2 kg/L or 7.2 g/mL or 7.2 g/cm3)

Considering how the body is organized, give one reason  the reason it is difficult for scientists to build a heart is D: The heart is made up of many different types of cells that are organized into different tissues.

Tissues: A collection of cells that work as a single unit and have a similar structure are referred to as tissues. The body's tissues give it form and aid in energy storage and heat retention. Connective tissue, epithelial tissue, muscle tissue, and nervous tissue are the four different types of tissues.

muscular tissue, connective tissue, epithelial tissue, and nerve tissue. Other tissues are held together and supported by connective tissue (bone, blood, and lymph tissues). A coating is provided by epithelial tissue (skin, the linings of the various passages inside the body).

Therefore, option D

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Answer:

Firstly, try to Go through your chapter and pay attention to main keywords.

secondly try to watch 'Uube' videos related to specific topic instead of chapter and pay attention to it closely and watch it with a keen interest.

Discuss topics that you find harder with your friends or peer group members, Because you learn faster when you study with the people of your age.

Answer:

i think the best way to learn chemistry is study over things that involve it

Explanation:

Answer: D) Monitor the sea level over set period of time.

Since global warming causes land ice to melt, that water goes into the ocean to raise sea levels. This is an effect of global warming.

Choices A through C are things to measure if you want to measure causes of global warming, so we can rule those out.

A combustion reaction is a type of chemical reaction that involves the rapid combination of fuel (typically a hydrocarbon) with oxygen, resulting in the release of energy in the form of heat and light.

Combustion reactions are often characterized by the presence of a flame and the production of carbon dioxide (CO₂) and water (H₂O) as products.

In the given balanced combustion reaction:

C₂H₂ + 5O₂ → 4H₂O + 2CO₂

The stoichiometric ratio indicates that 1 mole of C₂H₂ reacts with 2 moles of CO₂ produced. Therefore, if 4.44 moles of C₂H₂ react, we can calculate the moles of CO₂ produced using the ratio:

Moles of CO₂ = (4.44 mol C₂H₂) × (2 mol CO₂ / 1 mol C₂H₂)

Moles of CO₂ = 8.88 mol

Therefore, 8.88 moles of CO₂ will be produced in the combustion reaction.

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Answer

The chemical formula(s) are:

Carbonic acid is H₂CO₃

Bicarbonate is HCO₃⁻

Carbonate is CO₃²⁻ and

Calcium carbonate is CaCO₃

The chemical reaction that produces each of these molecules are:

CO₂ + H₂O ⇄ H₂CO₃ ⇄ HCO₃⁻ + H⁺ ⇄ CO₃²⁻ + H⁺

Ca²⁺ + CO₃²⁻ → CaCO₃

Explanation

Chemical name Chemical formula

Carbonic acid H₂CO₃

Bicarbonate HCO₃⁻

Carbonate CO₃²⁻

Calcium carbonate CaCO₃

Carbonic acid, (H₂CO₃) is a compound formed in small amounts when its anhydride, carbon dioxide (CO₂), dissolves in water.

Bicarbonate (HCO₃⁻) forms when a positively charged ion attaches to the negatively charged oxygen atoms of the ion, forming an ionic compound.

H₂CO₃, HCO₃⁻, and CO₃²⁻ can be formed as shown in the chemical equation below.

CO₂ + H₂O ⇄ H₂CO₃ ⇄ HCO₃⁻ + H⁺ ⇄ CO₃²⁻ + H⁺

In the presence of a calcium ion, (Ca²⁺) from hard water, carbonate, (CO₃²⁻) will combine with it to form calcium carbonate.

Ca²⁺ + CO₃²⁻ → CaCO₃

Answer:

B. habitat

Explanation:

got it right on my test hope this helps:)

Answer:

It's habitat.

Explanation:

I took the Module 3 Exam and got it right.

Answer:

see explaination

Explanation:

Please kindly check attachment for the step by step solution of the given problem

The reaction order and specific reaction rate constant can be determined by performing the kinetics experiment on irreversible polymerization A. Kinetic experiments can be used to investigate the rate and mechanism of chemical reactions. Chemical kinetics is the study of chemical reactions' speed and pathway.

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First, we write our reaction:

PbO + 2HNO3 ====> Pb(NO3)2 + H2O (it is already balanced)

We need the mass of Pb(NO3)2 to be produced, from 25 g of HNO3

Procedure: Stoichiometry

Data:

The molar mass of PbO=223.2 g/mol

The molar mass of HNO3 =63.01g/mol

The molar mass of Pb(NO3)2 =331.2g/mol

The molar mass of H2O=18.0g/mol

According to our reaction, we proceed like this:

2 x 63.01 g HNO3 ------- 1 x 331.2 g Pb(NO3)2

25 g HNO3 -------- X

X = (25 g x 1 x 331.2 g)/ 2 x 63.01 g

X = 65.70 g

Answer: 65.70 g Pb(NO3)2

Answer: 50mL

Explanation: This is solved just like you'd solve a proportion in mathematics. But first, you need to make your temperature values have the same units. It is ideal to have both units in K almost 90% of the time. So to convert the values, you'll add 273 to your Celsius temperature: 27. This gives you 300. Then, you set 300K/25mL = 600K/?. We see that to get from 300 to 600, we just double our values. Therefore, we'll do the same to the 25mL. This gives us 50mL.

I hope this helps!

Chemistry =>Chemical Reactions => Balancing equations

We have the oxidation of iron in the equation.

To balance the equation we must start by counting the atoms of each element on both sides of the reaction.

We will balance the oxygen. We have 2 atoms of oxygen on the reactants. So we write coefficient 2 on the FeO molecule.

Now, we balance the iron. We have 2 Fe atoms, so we write the coefficient 2 on the Fe molecule. We have:

Now, the equation of the reaction is balanced.

Answer: 2Fe + O2 →2FeO

Answer:

The absolute zero temperature T = - 269.91° C

Explanation:

From the given information:

The plot of the volume of the experimental data against the celsius temperature can be expressed mathematically as:

V = mT + c

V = 0.0741 × T+c --- (1)

where;

m, which is the straight line of the slope = 0.0741

replacing the value of V to be = 20 L, T= 0.

Then:

20 = 0.0741 × 0 + c

20 = c

From equation (1), replacing the value of c with 20, we have:

V = 0.0741 × T+20

SO, to determine absolute zero temperature: we have the volume to be zero at absolute zero temperature, Thus:

0 = 0.0741 × T+20

0.0741 T + 20  = 0

0.0741 T = - 20

\(\mathbf{T = \dfrac{-20}{0.0741}}\)

T = - 269.91° C

Answer:

denser than freshwater due to the sodium chloride dissolved in it.

Explanation:

t. This means that a specific volume of salt water is heaver than the same volume of freshwater. ... While colder water is denser, when water freezes into ice, it becomes less dense and floats on the surface

Answer: Neils Bohr

Explanation: Development of the Atomic Theory. In 1913, Neils Bohr, a student of Rutherford 's, developed a new model of the atom. He proposed that electrons are arranged in concentric circular orbits around the nucleus. This model is patterned on the solar system and is known as the planetary model.

Based on the given half-life, the amount of time it takes for 3/4 of a radioactive sample of an isotope of bromine to decay is 33 hours.

The time needed for a quantity to decrease to half of its initial value is known as the half-life. In nuclear physics, the phrase is frequently used to indicate how rapidly unstable atoms decay radioactively or how long stable atoms last.

Any substance that contains unstable atoms that release ionizing radiation during their natural decay is considered radioactive material.

Given the half-life of the radioactive sample of an isotope of bromine to be 16.5 hours. The amount of time it takes for 3/4 of a radioactive sample of an isotope of bromine to decay is calculated as follows:

After one half-life, half of the sample remains, and half decays

After two half-lives, 1/4 of the sample remains, and 3/4 decays

The time for two half-lives = 16.5 hours * 2

The time for two half-lives = 33 hours.

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Answer:

8.1*10^-3 or 0.00809917

Explanation:

Step 1: Identify the common ion

LiF and BaF2 both share the ion F^- therefore we can interchange the molarity of LiF for F.

Step 2: Set up a balanced equation

BaF2---Ba2+   +  2F

Step 3: Set up a solubility ice table

initial- Ba^2+: 0      2F: 0.0550

change- S               2F: S^2(exponent is result of coefficient)

Step 4: Set up Ksp equation

2.45*10^-5=[S][S]^2

Step 5: Plug in values

2.45*10^-5=[S][0.0550]^2

S=8.1*10^-3

Answer:

The frequency is the answer for your question in the comments

Explanation: For this Question..

B) is the answer in terms of an economic factor that contributes to the stability of a society.

Among the options, option B low tax and interest rates is an economic factor that contributes to the stability of a society.

Tax is a mandatory financial charges imposed on a working person or an owner of a service or property by a governmental organization  for the fund for public expenditure.

The only feasible way to get money to pay for government expenditure on the products and services that the majority of us need is through taxes. But, establishing an effective and fair tax system is far from easy, especially for developing nations that seek to integrate into the global economy.

When trying to set up effective tax systems, developing nations encounter enormous obstacles. First off, most people in these nations work in agriculture or small, unofficial businesses. Their incomes fluctuate since they are rarely paid a regular, fixed wage, and many of them are compensated in cash "off the books."

Therefore, tax which is moderate to be payable by people in all sectors and lo interest rate contribute to the stability of society.

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Answer:

True

Explanation:

You must first observe your data then form a hypothesis.

Answer:

I answer this one before

Explanation:

right

Answer:

1.  A principle under which all persons, institutions, and entities are accountable to laws that are: Publicly promulgated. Equally enforced. Independently adjudicated. And consistent with international human rights principles.

2. The laws are clear, publicized, and stable; are applied evenly; and protect fundamental rights, including the security of persons and contract, property, and human rights. The processes by which the laws are enacted, administered, and enforced are accessible, fair, and efficient.

3. It codifies the core values of the people. Courts have the responsibility to interpret the Constitution's meaning, as well as the meaning of any laws passed by Congress.  Everything they do must be based on the law, and they are accountable for their decisions. That means officials are held responsible for the choices they make.

Answer:

2HCl is the product of this reaction 2 is added in order to balance the reaction

The VSEPR (Valence Shell Electron Pair Repulsion) theory describes the arrangement of electron pairs around a central atom in a molecule, and the VSEPR number represents the total number of electron pairs around the central atom, including both bonding pairs and lone pairs.The VSEPR number can be determined from the Lewis structure of the molecule, which shows the arrangement of atoms and lone pairs around the central atom. The first two digits of the VSEPR number correspond to the number of bonding pairs and lone pairs, respectively, around the central atom.To determine the third digit of the VSEPR number, you need to consider the shape of the molecule. The shape is determined by the repulsion between electron pairs, which is strongest between lone pairs and decreases in the order lone pair-lone pair > lone pair-bonding pair > bonding pair-bonding pair.The third digit of the VSEPR number indicates the shape of the molecule according to the following scheme:1: linear shape2: trigonal planar shape3: tetrahedral shape4: trigonal bipyramidal shape5: octahedral shapeThus, to determine the third digit of the VSEPR number, you need to determine the shape of the molecule based on the number of electron pairs and their relative positions. This can be done by applying the VSEPR theory and considering the repulsion between electron pairs. Alternatively, you can consult a table or chart that lists the shapes associated with different VSEPR numbers.

Total electrons in fluorine (F): 9. Valence electrons in fluorine (F):7.

The element fluorine (F) is located in the periodic table in Group 17, also known as Group VIIA or the halogens. Fluorine has an atomic number of 9, indicating that it contains 9 electrons in its neutral state.

To determine the total number of electrons in a neutral atom of fluorine, we refer to its atomic number, which corresponds to the number of protons and electrons in an atom. Thus, fluorine has a total of 9 electrons.

Valence electrons are the electrons in the outermost energy level, also known as the valence shell, of an atom. For fluorine, the valence electrons are found in the second energy level, specifically in the 2p orbital. Since the second energy level can accommodate a maximum of 8 electrons, fluorine has 7 valence electrons.

Valence electrons play a crucial role in chemical bonding and determining the reactivity of an element. In the case of fluorine, its 7 valence electrons make it highly reactive, as it only needs one additional electron to achieve a stable, full outer electron configuration of 8 electrons. This strong desire to gain an electron makes fluorine one of the most electronegative elements on the periodic table.

In summary, a neutral atom of fluorine (F) has a total of 9 electrons, with 7 of them being valence electrons located in the 2p orbital.

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Answer:

chemistry, deposition occurs when molecules settle out of a solution. Deposition can be viewed as a reverse process to dissolution or particle re-entrainment. It is a phase change from the gaseous state to a solid, without passing through the liquid state, also called re-sublimation.

Explanation:

Examples include beaches, deltas, glacial moraines, sand dunes and salt domes. In severely cold temperatures frost will form on windows because the water vapor in the air comes into contact with a window and immediately forms ice without ever forming liquid water.

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1. Conduction : direct contact

2. Convection : hot & cold liquid motion

3. Radiation :  via electromagnetic waves & warm gas rising

1. Conduction: This has to do with the transfer of heat from one medium to another having direct contact with each other, the medium can either be solid or liquids

2. Convection: Has to do with the transfer of heat energy via molecules of the liquids in motion with different or varying temperature gradients

3. Radiation: Mostly occurs in gases, it is the transfer of energy through waves

Answer:

0.35 M

Explanation:

Using the formula; C1V1 = C2V2

Where;

C1 = concentration of initial solution

C2 = concentration of final solution

V1 = volume of initial solution

V2 = volume of final solution

Based on this question, I start with 0.0350 L of a 12.0 M hydrochloric acid solution, and dilute it with water to a new volume of 1.20 L. This means that:

C1 = 12.0 M, V1 = 0.0350 L, V2 = 1.20 L, C2 = ?

Hence, C1V1 = C2V2

12 × 0.0350 = C2 × 1.20

0.42 = 1.2C2

C2 = 0.42/1.2

C2 = 0.35 M

Among the given options the compound with the formula C₃H₈ is option C. It is an organic compound under named as propane.

What is propane?

Propane is an organic compound classified as a hydrocarbon  with saturated carbon - hydrogen bonds. It's formula is C₃H₈. It contains 3 carbons and 8 hydrogens.

The two end carbons contains 3 hydrogens each and the middle carbon contains 2 hydrogens. They are all bonded through sigma bonding. The compound in A is C₅H₁₂ and in B, it is C₆H₁₄.

The formula of the compound in option D is C₅H₁₀. Hence, the skeleton showing the compound with the formula of C₃H₈ is option C.

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0.5 moles of lithium chloride are dissolved in .05 liters of water. 10M  is the molarity of the solution.

The total amount of moles of solute found within a specific number of litres of the solution, or moles per litre of a solution, is known as molar concentration or molarity. Please explain the difference amongst the terms "solute" and "solvent" before we continue.

'Solution' for making it simpler to comprehend the topics that will follow. Solutes are simply substances that exist in solutions because a solution is defined as a homogenous mixture that comprises one or more solutes.

Molarity = moles/volume of solution in liter

              = 0.5/ .05

               = 10M

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